libmosquitto - a helper for MQTT clients

65 files changed, 16064 insertions, 0 deletions

diff --git a/libs/libmosquitto/include/config.h b/libs/libmosquitto/include/config.h
new file mode 100644
index 0000000000..f717d00c8a
--- /dev/null
+++ b/libs/libmosquitto/include/config.h
@@ -0,0 +1,69 @@
+#ifndef CONFIG_H
+#define CONFIG_H
+/* ============================================================
+ * Platform options
+ * ============================================================ */
+
+#ifdef __APPLE__
+#  define __DARWIN_C_SOURCE
+#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__SYMBIAN32__) || defined(__QNX__)
+#  define _XOPEN_SOURCE 700
+#  define __BSD_VISIBLE 1
+#  define HAVE_NETINET_IN_H
+#else
+#  define _XOPEN_SOURCE 700
+#  define _DEFAULT_SOURCE 1
+#  define _POSIX_C_SOURCE 200809L
+#endif
+
+#define _GNU_SOURCE
+
+#define OPENSSL_LOAD_CONF
+
+/* ============================================================
+ * Compatibility defines
+ * ============================================================ */
+#if defined(_MSC_VER) && _MSC_VER < 1900
+#  define snprintf sprintf_s
+#  define EPROTO ECONNABORTED
+#endif
+
+#ifdef WIN32
+#  ifndef strcasecmp
+#    define strcasecmp strcmpi
+#  endif
+#  define strtok_r strtok_s
+#  define strerror_r(e, b, l) strerror_s(b, l, e)
+#endif
+
+
+#define uthash_malloc(sz) mosquitto__malloc(sz)
+#define uthash_free(ptr,sz) mosquitto__free(ptr)
+
+
+#ifdef WITH_TLS
+#  include <openssl/opensslconf.h>
+#  if defined(WITH_TLS_PSK) && !defined(OPENSSL_NO_PSK)
+#    define FINAL_WITH_TLS_PSK
+#  endif
+#endif
+
+
+#ifdef __COVERITY__
+#  include <stdint.h>
+/* These are "wrong", but we don't use them so it doesn't matter */
+#  define _Float32 uint32_t
+#  define _Float32x uint32_t
+#  define _Float64 uint64_t
+#  define _Float64x uint64_t
+#  define _Float128 uint64_t
+#endif
+
+#define UNUSED(A) (void)(A)
+
+/* Android Bionic libpthread implementation doesn't have pthread_cancel */
+#ifndef ANDROID
+#  define HAVE_PTHREAD_CANCEL
+#endif
+
+#endif
diff --git a/libs/libmosquitto/include/mosquitto.h b/libs/libmosquitto/include/mosquitto.h
new file mode 100644
index 0000000000..09bba66e08
--- /dev/null
+++ b/libs/libmosquitto/include/mosquitto.h
@@ -0,0 +1,2993 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#ifndef MOSQUITTO_H
+#define MOSQUITTO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined(WIN32) && !defined(WITH_BROKER) && !defined(LIBMOSQUITTO_STATIC)
+#	ifdef libmosquitto_EXPORTS
+#		define libmosq_EXPORT  __declspec(dllexport)
+#	else
+#		define libmosq_EXPORT  __declspec(dllimport)
+#	endif
+#else
+#	define libmosq_EXPORT
+#endif
+
+#if defined(_MSC_VER) && _MSC_VER < 1900
+#	ifndef __cplusplus
+#		define bool char
+#		define true 1
+#		define false 0
+#	endif
+#else
+#	ifndef __cplusplus
+#		include <stdbool.h>
+#	endif
+#endif
+
+#include <stddef.h>
+#include <stdint.h>
+
+#define LIBMOSQUITTO_MAJOR 1
+#define LIBMOSQUITTO_MINOR 6
+#define LIBMOSQUITTO_REVISION 3
+/* LIBMOSQUITTO_VERSION_NUMBER looks like 1002001 for e.g. version 1.2.1. */
+#define LIBMOSQUITTO_VERSION_NUMBER (LIBMOSQUITTO_MAJOR*1000000+LIBMOSQUITTO_MINOR*1000+LIBMOSQUITTO_REVISION)
+
+/* Log types */
+#define MOSQ_LOG_NONE			0
+#define MOSQ_LOG_INFO			(1<<0)
+#define MOSQ_LOG_NOTICE			(1<<1)
+#define MOSQ_LOG_WARNING		(1<<2)
+#define MOSQ_LOG_ERR			(1<<3)
+#define MOSQ_LOG_DEBUG			(1<<4)
+#define MOSQ_LOG_SUBSCRIBE		(1<<5)
+#define MOSQ_LOG_UNSUBSCRIBE	(1<<6)
+#define MOSQ_LOG_WEBSOCKETS		(1<<7)
+#define MOSQ_LOG_INTERNAL		0x80000000
+#define MOSQ_LOG_ALL			0x7FFFFFFF
+
+/* Error values */
+enum mosq_err_t {
+	MOSQ_ERR_AUTH_CONTINUE = -4,
+	MOSQ_ERR_NO_SUBSCRIBERS = -3,
+	MOSQ_ERR_SUB_EXISTS = -2,
+	MOSQ_ERR_CONN_PENDING = -1,
+	MOSQ_ERR_SUCCESS = 0,
+	MOSQ_ERR_NOMEM = 1,
+	MOSQ_ERR_PROTOCOL = 2,
+	MOSQ_ERR_INVAL = 3,
+	MOSQ_ERR_NO_CONN = 4,
+	MOSQ_ERR_CONN_REFUSED = 5,
+	MOSQ_ERR_NOT_FOUND = 6,
+	MOSQ_ERR_CONN_LOST = 7,
+	MOSQ_ERR_TLS = 8,
+	MOSQ_ERR_PAYLOAD_SIZE = 9,
+	MOSQ_ERR_NOT_SUPPORTED = 10,
+	MOSQ_ERR_AUTH = 11,
+	MOSQ_ERR_ACL_DENIED = 12,
+	MOSQ_ERR_UNKNOWN = 13,
+	MOSQ_ERR_ERRNO = 14,
+	MOSQ_ERR_EAI = 15,
+	MOSQ_ERR_PROXY = 16,
+	MOSQ_ERR_PLUGIN_DEFER = 17,
+	MOSQ_ERR_MALFORMED_UTF8 = 18,
+	MOSQ_ERR_KEEPALIVE = 19,
+	MOSQ_ERR_LOOKUP = 20,
+	MOSQ_ERR_MALFORMED_PACKET = 21,
+	MOSQ_ERR_DUPLICATE_PROPERTY = 22,
+	MOSQ_ERR_TLS_HANDSHAKE = 23,
+	MOSQ_ERR_QOS_NOT_SUPPORTED = 24,
+	MOSQ_ERR_OVERSIZE_PACKET = 25,
+	MOSQ_ERR_OCSP = 26,
+};
+
+/* Option values */
+enum mosq_opt_t {
+	MOSQ_OPT_PROTOCOL_VERSION = 1,
+	MOSQ_OPT_SSL_CTX = 2,
+	MOSQ_OPT_SSL_CTX_WITH_DEFAULTS = 3,
+	MOSQ_OPT_RECEIVE_MAXIMUM = 4,
+	MOSQ_OPT_SEND_MAXIMUM = 5,
+	MOSQ_OPT_TLS_KEYFORM = 6,
+	MOSQ_OPT_TLS_ENGINE = 7,
+	MOSQ_OPT_TLS_ENGINE_KPASS_SHA1 = 8,
+	MOSQ_OPT_TLS_OCSP_REQUIRED = 9,
+	MOSQ_OPT_TLS_ALPN = 10,
+};
+
+
+/* MQTT specification restricts client ids to a maximum of 23 characters */
+#define MOSQ_MQTT_ID_MAX_LENGTH 23
+
+#define MQTT_PROTOCOL_V31 3
+#define MQTT_PROTOCOL_V311 4
+#define MQTT_PROTOCOL_V5 5
+
+struct mosquitto_message{
+	int mid;
+	char *topic;
+	void *payload;
+	int payloadlen;
+	int qos;
+	bool retain;
+};
+
+struct mosquitto;
+typedef struct mqtt5__property mosquitto_property;
+
+/*
+ * Topic: Threads
+ *	libmosquitto provides thread safe operation, with the exception of
+ *	<mosquitto_lib_init> which is not thread safe.
+ *
+ *	If your application uses threads you must use <mosquitto_threaded_set> to
+ *	tell the library this is the case, otherwise it makes some optimisations
+ *	for the single threaded case that may result in unexpected behaviour for
+ *	the multi threaded case.
+ */
+/***************************************************
+ * Important note
+ *
+ * The following functions that deal with network operations will return
+ * MOSQ_ERR_SUCCESS on success, but this does not mean that the operation has
+ * taken place. An attempt will be made to write the network data, but if the
+ * socket is not available for writing at that time then the packet will not be
+ * sent. To ensure the packet is sent, call mosquitto_loop() (which must also
+ * be called to process incoming network data).
+ * This is especially important when disconnecting a client that has a will. If
+ * the broker does not receive the DISCONNECT command, it will assume that the
+ * client has disconnected unexpectedly and send the will.
+ *
+ * mosquitto_connect()
+ * mosquitto_disconnect()
+ * mosquitto_subscribe()
+ * mosquitto_unsubscribe()
+ * mosquitto_publish()
+ ***************************************************/
+
+
+/* ======================================================================
+ *
+ * Section: Library version, init, and cleanup
+ *
+ * ====================================================================== */
+/*
+ * Function: mosquitto_lib_version
+ *
+ * Can be used to obtain version information for the mosquitto library.
+ * This allows the application to compare the library version against the
+ * version it was compiled against by using the LIBMOSQUITTO_MAJOR,
+ * LIBMOSQUITTO_MINOR and LIBMOSQUITTO_REVISION defines.
+ *
+ * Parameters:
+ *  major -    an integer pointer. If not NULL, the major version of the
+ *             library will be returned in this variable.
+ *  minor -    an integer pointer. If not NULL, the minor version of the
+ *             library will be returned in this variable.
+ *  revision - an integer pointer. If not NULL, the revision of the library will
+ *             be returned in this variable.
+ *
+ * Returns:
+ *	LIBMOSQUITTO_VERSION_NUMBER, which is a unique number based on the major,
+ *		minor and revision values.
+ * See Also:
+ * 	<mosquitto_lib_cleanup>, <mosquitto_lib_init>
+ */
+libmosq_EXPORT int mosquitto_lib_version(int *major, int *minor, int *revision);
+
+/*
+ * Function: mosquitto_lib_init
+ *
+ * Must be called before any other mosquitto functions.
+ *
+ * This function is *not* thread safe.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS - always
+ *
+ * See Also:
+ * 	<mosquitto_lib_cleanup>, <mosquitto_lib_version>
+ */
+libmosq_EXPORT int mosquitto_lib_init(void);
+
+/*
+ * Function: mosquitto_lib_cleanup
+ *
+ * Call to free resources associated with the library.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS - always
+ *
+ * See Also:
+ * 	<mosquitto_lib_init>, <mosquitto_lib_version>
+ */
+libmosq_EXPORT int mosquitto_lib_cleanup(void);
+
+
+/* ======================================================================
+ *
+ * Section: Client creation, destruction, and reinitialisation
+ *
+ * ====================================================================== */
+/*
+ * Function: mosquitto_new
+ *
+ * Create a new mosquitto client instance.
+ *
+ * Parameters:
+ * 	id -            String to use as the client id. If NULL, a random client id
+ * 	                will be generated. If id is NULL, clean_session must be true.
+ * 	clean_session - set to true to instruct the broker to clean all messages
+ *                  and subscriptions on disconnect, false to instruct it to
+ *                  keep them. See the man page mqtt(7) for more details.
+ *                  Note that a client will never discard its own outgoing
+ *                  messages on disconnect. Calling <mosquitto_connect> or
+ *                  <mosquitto_reconnect> will cause the messages to be resent.
+ *                  Use <mosquitto_reinitialise> to reset a client to its
+ *                  original state.
+ *                  Must be set to true if the id parameter is NULL.
+ * 	obj -           A user pointer that will be passed as an argument to any
+ *                  callbacks that are specified.
+ *
+ * Returns:
+ * 	Pointer to a struct mosquitto on success.
+ * 	NULL on failure. Interrogate errno to determine the cause for the failure:
+ *      - ENOMEM on out of memory.
+ *      - EINVAL on invalid input parameters.
+ *
+ * See Also:
+ * 	<mosquitto_reinitialise>, <mosquitto_destroy>, <mosquitto_user_data_set>
+ */
+libmosq_EXPORT struct mosquitto *mosquitto_new(const char *id, bool clean_session, void *obj);
+
+/*
+ * Function: mosquitto_destroy
+ *
+ * Use to free memory associated with a mosquitto client instance.
+ *
+ * Parameters:
+ * 	mosq - a struct mosquitto pointer to free.
+ *
+ * See Also:
+ * 	<mosquitto_new>, <mosquitto_reinitialise>
+ */
+libmosq_EXPORT void mosquitto_destroy(struct mosquitto *mosq);
+
+/*
+ * Function: mosquitto_reinitialise
+ *
+ * This function allows an existing mosquitto client to be reused. Call on a
+ * mosquitto instance to close any open network connections, free memory
+ * and reinitialise the client with the new parameters. The end result is the
+ * same as the output of <mosquitto_new>.
+ *
+ * Parameters:
+ * 	mosq -          a valid mosquitto instance.
+ * 	id -            string to use as the client id. If NULL, a random client id
+ * 	                will be generated. If id is NULL, clean_session must be true.
+ * 	clean_session - set to true to instruct the broker to clean all messages
+ *                  and subscriptions on disconnect, false to instruct it to
+ *                  keep them. See the man page mqtt(7) for more details.
+ *                  Must be set to true if the id parameter is NULL.
+ * 	obj -           A user pointer that will be passed as an argument to any
+ *                  callbacks that are specified.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -   if an out of memory condition occurred.
+ *
+ * See Also:
+ * 	<mosquitto_new>, <mosquitto_destroy>
+ */
+libmosq_EXPORT int mosquitto_reinitialise(struct mosquitto *mosq, const char *id, bool clean_session, void *obj);
+
+
+/* ======================================================================
+ *
+ * Section: Will
+ *
+ * ====================================================================== */
+/*
+ * Function: mosquitto_will_set
+ *
+ * Configure will information for a mosquitto instance. By default, clients do
+ * not have a will.  This must be called before calling <mosquitto_connect>.
+ *
+ * Parameters:
+ * 	mosq -       a valid mosquitto instance.
+ * 	topic -      the topic on which to publish the will.
+ * 	payloadlen - the size of the payload (bytes). Valid values are between 0 and
+ *               268,435,455.
+ * 	payload -    pointer to the data to send. If payloadlen > 0 this must be a
+ *               valid memory location.
+ * 	qos -        integer value 0, 1 or 2 indicating the Quality of Service to be
+ *               used for the will.
+ * 	retain -     set to true to make the will a retained message.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS -      on success.
+ * 	MOSQ_ERR_INVAL -          if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -          if an out of memory condition occurred.
+ * 	MOSQ_ERR_PAYLOAD_SIZE -   if payloadlen is too large.
+ * 	MOSQ_ERR_MALFORMED_UTF8 - if the topic is not valid UTF-8.
+ */
+libmosq_EXPORT int mosquitto_will_set(struct mosquitto *mosq, const char *topic, int payloadlen, const void *payload, int qos, bool retain);
+
+/*
+ * Function: mosquitto_will_set_v5
+ *
+ * Configure will information for a mosquitto instance, with attached
+ * properties. By default, clients do not have a will.  This must be called
+ * before calling <mosquitto_connect>.
+ *
+ * Parameters:
+ * 	mosq -       a valid mosquitto instance.
+ * 	topic -      the topic on which to publish the will.
+ * 	payloadlen - the size of the payload (bytes). Valid values are between 0 and
+ *               268,435,455.
+ * 	payload -    pointer to the data to send. If payloadlen > 0 this must be a
+ *               valid memory location.
+ * 	qos -        integer value 0, 1 or 2 indicating the Quality of Service to be
+ *               used for the will.
+ * 	retain -     set to true to make the will a retained message.
+ * 	properties - list of MQTT 5 properties. Can be NULL. On success only, the
+ * 	             property list becomes the property of libmosquitto once this
+ * 	             function is called and will be freed by the library. The
+ * 	             property list must be freed by the application on error.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS -      on success.
+ * 	MOSQ_ERR_INVAL -          if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -          if an out of memory condition occurred.
+ * 	MOSQ_ERR_PAYLOAD_SIZE -   if payloadlen is too large.
+ * 	MOSQ_ERR_MALFORMED_UTF8 - if the topic is not valid UTF-8.
+ * 	MOSQ_ERR_NOT_SUPPORTED -  if properties is not NULL and the client is not
+ * 	                          using MQTT v5
+ * 	MOSQ_ERR_PROTOCOL -       if a property is invalid for use with wills.
+ *	MOSQ_ERR_DUPLICATE_PROPERTY - if a property is duplicated where it is forbidden.
+ */
+libmosq_EXPORT int mosquitto_will_set_v5(struct mosquitto *mosq, const char *topic, int payloadlen, const void *payload, int qos, bool retain, mosquitto_property *properties);
+
+/*
+ * Function: mosquitto_will_clear
+ *
+ * Remove a previously configured will. This must be called before calling
+ * <mosquitto_connect>.
+ *
+ * Parameters:
+ * 	mosq - a valid mosquitto instance.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ */
+libmosq_EXPORT int mosquitto_will_clear(struct mosquitto *mosq);
+
+
+/* ======================================================================
+ *
+ * Section: Username and password
+ *
+ * ====================================================================== */
+/*
+ * Function: mosquitto_username_pw_set
+ *
+ * Configure username and password for a mosquitton instance. This is only
+ * supported by brokers that implement the MQTT spec v3.1. By default, no
+ * username or password will be sent.
+ * If username is NULL, the password argument is ignored.
+ * This must be called before calling mosquitto_connect().
+ *
+ * This is must be called before calling <mosquitto_connect>.
+ *
+ * Parameters:
+ * 	mosq -     a valid mosquitto instance.
+ * 	username - the username to send as a string, or NULL to disable
+ *             authentication.
+ * 	password - the password to send as a string. Set to NULL when username is
+ * 	           valid in order to send just a username.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -   if an out of memory condition occurred.
+ */
+libmosq_EXPORT int mosquitto_username_pw_set(struct mosquitto *mosq, const char *username, const char *password);
+
+
+/* ======================================================================
+ *
+ * Section: Connecting, reconnecting, disconnecting
+ *
+ * ====================================================================== */
+/*
+ * Function: mosquitto_connect
+ *
+ * Connect to an MQTT broker.
+ *
+ * Parameters:
+ * 	mosq -      a valid mosquitto instance.
+ * 	host -      the hostname or ip address of the broker to connect to.
+ * 	port -      the network port to connect to. Usually 1883.
+ * 	keepalive - the number of seconds after which the broker should send a PING
+ *              message to the client if no other messages have been exchanged
+ *              in that time.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_ERRNO -   if a system call returned an error. The variable errno
+ *                     contains the error code, even on Windows.
+ *                     Use strerror_r() where available or FormatMessage() on
+ *                     Windows.
+ *
+ * See Also:
+ * 	<mosquitto_connect_bind>, <mosquitto_connect_async>, <mosquitto_reconnect>, <mosquitto_disconnect>, <mosquitto_tls_set>
+ */
+libmosq_EXPORT int mosquitto_connect(struct mosquitto *mosq, const char *host, int port, int keepalive);
+
+/*
+ * Function: mosquitto_connect_bind
+ *
+ * Connect to an MQTT broker. This extends the functionality of
+ * <mosquitto_connect> by adding the bind_address parameter. Use this function
+ * if you need to restrict network communication over a particular interface.
+ *
+ * Parameters:
+ * 	mosq -         a valid mosquitto instance.
+ * 	host -         the hostname or ip address of the broker to connect to.
+ * 	port -         the network port to connect to. Usually 1883.
+ * 	keepalive -    the number of seconds after which the broker should send a PING
+ *                 message to the client if no other messages have been exchanged
+ *                 in that time.
+ *  bind_address - the hostname or ip address of the local network interface to
+ *                 bind to.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_ERRNO -   if a system call returned an error. The variable errno
+ *                     contains the error code, even on Windows.
+ *                     Use strerror_r() where available or FormatMessage() on
+ *                     Windows.
+ *
+ * See Also:
+ * 	<mosquitto_connect>, <mosquitto_connect_async>, <mosquitto_connect_bind_async>
+ */
+libmosq_EXPORT int mosquitto_connect_bind(struct mosquitto *mosq, const char *host, int port, int keepalive, const char *bind_address);
+
+/*
+ * Function: mosquitto_connect_bind_v5
+ *
+ * Connect to an MQTT broker. This extends the functionality of
+ * <mosquitto_connect> by adding the bind_address parameter. Use this function
+ * if you need to restrict network communication over a particular interface.
+ *
+ * Parameters:
+ * 	mosq -         a valid mosquitto instance.
+ * 	host -         the hostname or ip address of the broker to connect to.
+ * 	port -         the network port to connect to. Usually 1883.
+ * 	keepalive -    the number of seconds after which the broker should send a PING
+ *                 message to the client if no other messages have been exchanged
+ *                 in that time.
+ *  bind_address - the hostname or ip address of the local network interface to
+ *                 bind to.
+ *  properties - the MQTT 5 properties for the connect (not for the Will).
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_ERRNO -   if a system call returned an error. The variable errno
+ *                     contains the error code, even on Windows.
+ *                     Use strerror_r() where available or FormatMessage() on
+ *                     Windows.
+ *	MOSQ_ERR_DUPLICATE_PROPERTY - if a property is duplicated where it is forbidden.
+ *	MOSQ_ERR_PROTOCOL - if any property is invalid for use with CONNECT.
+ *
+ * See Also:
+ * 	<mosquitto_connect>, <mosquitto_connect_async>, <mosquitto_connect_bind_async>
+ */
+libmosq_EXPORT int mosquitto_connect_bind_v5(struct mosquitto *mosq, const char *host, int port, int keepalive, const char *bind_address, const mosquitto_property *properties);
+
+/*
+ * Function: mosquitto_connect_async
+ *
+ * Connect to an MQTT broker. This is a non-blocking call. If you use
+ * <mosquitto_connect_async> your client must use the threaded interface
+ * <mosquitto_loop_start>. If you need to use <mosquitto_loop>, you must use
+ * <mosquitto_connect> to connect the client.
+ *
+ * May be called before or after <mosquitto_loop_start>.
+ *
+ * Parameters:
+ * 	mosq -      a valid mosquitto instance.
+ * 	host -      the hostname or ip address of the broker to connect to.
+ * 	port -      the network port to connect to. Usually 1883.
+ * 	keepalive - the number of seconds after which the broker should send a PING
+ *              message to the client if no other messages have been exchanged
+ *              in that time.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_ERRNO -   if a system call returned an error. The variable errno
+ *                     contains the error code, even on Windows.
+ *                     Use strerror_r() where available or FormatMessage() on
+ *                     Windows.
+ *
+ * See Also:
+ * 	<mosquitto_connect_bind_async>, <mosquitto_connect>, <mosquitto_reconnect>, <mosquitto_disconnect>, <mosquitto_tls_set>
+ */
+libmosq_EXPORT int mosquitto_connect_async(struct mosquitto *mosq, const char *host, int port, int keepalive);
+
+/*
+ * Function: mosquitto_connect_bind_async
+ *
+ * Connect to an MQTT broker. This is a non-blocking call. If you use
+ * <mosquitto_connect_bind_async> your client must use the threaded interface
+ * <mosquitto_loop_start>. If you need to use <mosquitto_loop>, you must use
+ * <mosquitto_connect> to connect the client.
+ *
+ * This extends the functionality of <mosquitto_connect_async> by adding the
+ * bind_address parameter. Use this function if you need to restrict network
+ * communication over a particular interface.
+ *
+ * May be called before or after <mosquitto_loop_start>.
+ *
+ * Parameters:
+ * 	mosq -         a valid mosquitto instance.
+ * 	host -         the hostname or ip address of the broker to connect to.
+ * 	port -         the network port to connect to. Usually 1883.
+ * 	keepalive -    the number of seconds after which the broker should send a PING
+ *                 message to the client if no other messages have been exchanged
+ *                 in that time.
+ *  bind_address - the hostname or ip address of the local network interface to
+ *                 bind to.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_ERRNO -   if a system call returned an error. The variable errno
+ *                     contains the error code, even on Windows.
+ *                     Use strerror_r() where available or FormatMessage() on
+ *                     Windows.
+ *
+ * See Also:
+ * 	<mosquitto_connect_async>, <mosquitto_connect>, <mosquitto_connect_bind>
+ */
+libmosq_EXPORT int mosquitto_connect_bind_async(struct mosquitto *mosq, const char *host, int port, int keepalive, const char *bind_address);
+
+/*
+ * Function: mosquitto_connect_srv
+ *
+ * Connect to an MQTT broker. This is a non-blocking call. If you use
+ * <mosquitto_connect_async> your client must use the threaded interface
+ * <mosquitto_loop_start>. If you need to use <mosquitto_loop>, you must use
+ * <mosquitto_connect> to connect the client.
+ *
+ * This extends the functionality of <mosquitto_connect_async> by adding the
+ * bind_address parameter. Use this function if you need to restrict network
+ * communication over a particular interface.
+ *
+ * May be called before or after <mosquitto_loop_start>.
+ *
+ * Parameters:
+ * 	mosq -         a valid mosquitto instance.
+ * 	host -         the hostname or ip address of the broker to connect to.
+ * 	keepalive -    the number of seconds after which the broker should send a PING
+ *                 message to the client if no other messages have been exchanged
+ *                 in that time.
+ *  bind_address - the hostname or ip address of the local network interface to
+ *                 bind to.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_ERRNO -   if a system call returned an error. The variable errno
+ *                     contains the error code, even on Windows.
+ *                     Use strerror_r() where available or FormatMessage() on
+ *                     Windows.
+ *
+ * See Also:
+ * 	<mosquitto_connect_async>, <mosquitto_connect>, <mosquitto_connect_bind>
+ */
+libmosq_EXPORT int mosquitto_connect_srv(struct mosquitto *mosq, const char *host, int keepalive, const char *bind_address);
+
+/*
+ * Function: mosquitto_reconnect
+ *
+ * Reconnect to a broker.
+ *
+ * This function provides an easy way of reconnecting to a broker after a
+ * connection has been lost. It uses the values that were provided in the
+ * <mosquitto_connect> call. It must not be called before
+ * <mosquitto_connect>.
+ *
+ * Parameters:
+ * 	mosq - a valid mosquitto instance.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -   if an out of memory condition occurred.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_ERRNO -   if a system call returned an error. The variable errno
+ *                     contains the error code, even on Windows.
+ *                     Use strerror_r() where available or FormatMessage() on
+ *                     Windows.
+ *
+ * See Also:
+ * 	<mosquitto_connect>, <mosquitto_disconnect>, <mosquitto_reconnect_async>
+ */
+libmosq_EXPORT int mosquitto_reconnect(struct mosquitto *mosq);
+
+/*
+ * Function: mosquitto_reconnect_async
+ *
+ * Reconnect to a broker. Non blocking version of <mosquitto_reconnect>.
+ *
+ * This function provides an easy way of reconnecting to a broker after a
+ * connection has been lost. It uses the values that were provided in the
+ * <mosquitto_connect> or <mosquitto_connect_async> calls. It must not be
+ * called before <mosquitto_connect>.
+ *
+ * Parameters:
+ * 	mosq - a valid mosquitto instance.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -   if an out of memory condition occurred.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_ERRNO -   if a system call returned an error. The variable errno
+ *                     contains the error code, even on Windows.
+ *                     Use strerror_r() where available or FormatMessage() on
+ *                     Windows.
+ *
+ * See Also:
+ * 	<mosquitto_connect>, <mosquitto_disconnect>
+ */
+libmosq_EXPORT int mosquitto_reconnect_async(struct mosquitto *mosq);
+
+/*
+ * Function: mosquitto_disconnect
+ *
+ * Disconnect from the broker.
+ *
+ * Parameters:
+ *	mosq - a valid mosquitto instance.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_NO_CONN -  if the client isn't connected to a broker.
+ */
+libmosq_EXPORT int mosquitto_disconnect(struct mosquitto *mosq);
+
+/*
+ * Function: mosquitto_disconnect_v5
+ *
+ * Disconnect from the broker, with attached MQTT properties.
+ *
+ * Use <mosquitto_property_add_*> to create a list of properties, then attach
+ * them to this publish. Properties need freeing with
+ * <mosquitto_property_free_all>.
+ *
+ * Parameters:
+ *	mosq - a valid mosquitto instance.
+ *	reason_code - the disconnect reason code.
+ * 	properties - a valid mosquitto_property list, or NULL.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_NO_CONN -  if the client isn't connected to a broker.
+ *	MOSQ_ERR_DUPLICATE_PROPERTY - if a property is duplicated where it is forbidden.
+ *	MOSQ_ERR_PROTOCOL - if any property is invalid for use with DISCONNECT.
+ */
+libmosq_EXPORT int mosquitto_disconnect_v5(struct mosquitto *mosq, int reason_code, const mosquitto_property *properties);
+
+
+/* ======================================================================
+ *
+ * Section: Publishing, subscribing, unsubscribing
+ *
+ * ====================================================================== */
+/*
+ * Function: mosquitto_publish
+ *
+ * Publish a message on a given topic.
+ *
+ * Parameters:
+ * 	mosq -       a valid mosquitto instance.
+ * 	mid -        pointer to an int. If not NULL, the function will set this
+ *               to the message id of this particular message. This can be then
+ *               used with the publish callback to determine when the message
+ *               has been sent.
+ *               Note that although the MQTT protocol doesn't use message ids
+ *               for messages with QoS=0, libmosquitto assigns them message ids
+ *               so they can be tracked with this parameter.
+ *  topic -      null terminated string of the topic to publish to.
+ * 	payloadlen - the size of the payload (bytes). Valid values are between 0 and
+ *               268,435,455.
+ * 	payload -    pointer to the data to send. If payloadlen > 0 this must be a
+ *               valid memory location.
+ * 	qos -        integer value 0, 1 or 2 indicating the Quality of Service to be
+ *               used for the message.
+ * 	retain -     set to true to make the message retained.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS -        on success.
+ * 	MOSQ_ERR_INVAL -          if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -          if an out of memory condition occurred.
+ * 	MOSQ_ERR_NO_CONN -        if the client isn't connected to a broker.
+ *	MOSQ_ERR_PROTOCOL -       if there is a protocol error communicating with the
+ *                            broker.
+ * 	MOSQ_ERR_PAYLOAD_SIZE -   if payloadlen is too large.
+ * 	MOSQ_ERR_MALFORMED_UTF8 - if the topic is not valid UTF-8
+ *	MOSQ_ERR_QOS_NOT_SUPPORTED - if the QoS is greater than that supported by
+ *	                             the broker.
+ *	MOSQ_ERR_OVERSIZE_PACKET - if the resulting packet would be larger than
+ *	                           supported by the broker.
+ *
+ * See Also:
+ *	<mosquitto_max_inflight_messages_set>
+ */
+libmosq_EXPORT int mosquitto_publish(struct mosquitto *mosq, int *mid, const char *topic, int payloadlen, const void *payload, int qos, bool retain);
+
+
+/*
+ * Function: mosquitto_publish_v5
+ *
+ * Publish a message on a given topic, with attached MQTT properties.
+ *
+ * Use <mosquitto_property_add_*> to create a list of properties, then attach
+ * them to this publish. Properties need freeing with
+ * <mosquitto_property_free_all>.
+ *
+ * Requires the mosquitto instance to be connected with MQTT 5.
+ *
+ * Parameters:
+ * 	mosq -       a valid mosquitto instance.
+ * 	mid -        pointer to an int. If not NULL, the function will set this
+ *               to the message id of this particular message. This can be then
+ *               used with the publish callback to determine when the message
+ *               has been sent.
+ *               Note that although the MQTT protocol doesn't use message ids
+ *               for messages with QoS=0, libmosquitto assigns them message ids
+ *               so they can be tracked with this parameter.
+ *  topic -      null terminated string of the topic to publish to.
+ * 	payloadlen - the size of the payload (bytes). Valid values are between 0 and
+ *               268,435,455.
+ * 	payload -    pointer to the data to send. If payloadlen > 0 this must be a
+ *               valid memory location.
+ * 	qos -        integer value 0, 1 or 2 indicating the Quality of Service to be
+ *               used for the message.
+ * 	retain -     set to true to make the message retained.
+ * 	properties - a valid mosquitto_property list, or NULL.
+ *
+ * Returns:
+ * 	MOSQ_ERR_SUCCESS -        on success.
+ * 	MOSQ_ERR_INVAL -          if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -          if an out of memory condition occurred.
+ * 	MOSQ_ERR_NO_CONN -        if the client isn't connected to a broker.
+ *	MOSQ_ERR_PROTOCOL -       if there is a protocol error communicating with the
+ *                            broker.
+ * 	MOSQ_ERR_PAYLOAD_SIZE -   if payloadlen is too large.
+ * 	MOSQ_ERR_MALFORMED_UTF8 - if the topic is not valid UTF-8
+ *	MOSQ_ERR_DUPLICATE_PROPERTY - if a property is duplicated where it is forbidden.
+ *	MOSQ_ERR_PROTOCOL - if any property is invalid for use with PUBLISH.
+ *	MOSQ_ERR_QOS_NOT_SUPPORTED - if the QoS is greater than that supported by
+ *	                             the broker.
+ *	MOSQ_ERR_OVERSIZE_PACKET - if the resulting packet would be larger than
+ *	                           supported by the broker.
+ */
+libmosq_EXPORT int mosquitto_publish_v5(
+		struct mosquitto *mosq,
+		int *mid,
+		const char *topic,
+		int payloadlen,
+		const void *payload,
+		int qos,
+		bool retain,
+		const mosquitto_property *properties);
+
+
+/*
+ * Function: mosquitto_subscribe
+ *
+ * Subscribe to a topic.
+ *
+ * Parameters:
+ *	mosq - a valid mosquitto instance.
+ *	mid -  a pointer to an int. If not NULL, the function will set this to
+ *	       the message id of this particular message. This can be then used
+ *	       with the subscribe callback to determine when the message has been
+ *	       sent.
+ *	sub -  the subscription pattern.
+ *	qos -  the requested Quality of Service for this subscription.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS -        on success.
+ * 	MOSQ_ERR_INVAL -          if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -          if an out of memory condition occurred.
+ * 	MOSQ_ERR_NO_CONN -        if the client isn't connected to a broker.
+ * 	MOSQ_ERR_MALFORMED_UTF8 - if the topic is not valid UTF-8
+ *	MOSQ_ERR_OVERSIZE_PACKET - if the resulting packet would be larger than
+ *	                           supported by the broker.
+ */
+libmosq_EXPORT int mosquitto_subscribe(struct mosquitto *mosq, int *mid, const char *sub, int qos);
+
+/*
+ * Function: mosquitto_subscribe_v5
+ *
+ * Subscribe to a topic, with attached MQTT properties.
+ *
+ * Use <mosquitto_property_add_*> to create a list of properties, then attach
+ * them to this subscribe. Properties need freeing with
+ * <mosquitto_property_free_all>.
+ *
+ * Requires the mosquitto instance to be connected with MQTT 5.
+ *
+ *
+ * Parameters:
+ *	mosq - a valid mosquitto instance.
+ *	mid -  a pointer to an int. If not NULL, the function will set this to
+ *	       the message id of this particular message. This can be then used
+ *	       with the subscribe callback to determine when the message has been
+ *	       sent.
+ *	sub -  the subscription pattern.
+ *	qos -  the requested Quality of Service for this subscription.
+ *	options - options to apply to this subscription, OR'd together. Set to 0 to
+ *	          use the default options, otherwise choose from the list:
+ *	          MQTT_SUB_OPT_NO_LOCAL - with this option set, if this client
+ *	                        publishes to a topic to which it is subscribed, the
+ *	                        broker will not publish the message back to the
+ *	                        client.
+ *	          MQTT_SUB_OPT_RETAIN_AS_PUBLISHED - with this option set, messages
+ *	                        published for this subscription will keep the
+ *	                        retain flag as was set by the publishing client.
+ *	                        The default behaviour without this option set has
+ *	                        the retain flag indicating whether a message is
+ *	                        fresh/stale.
+ *	          MQTT_SUB_OPT_SEND_RETAIN_ALWAYS - with this option set,
+ *	                        pre-existing retained messages are sent as soon as
+ *	                        the subscription is made, even if the subscription
+ *	                        already exists. This is the default behaviour, so
+ *	                        it is not necessary to set this option.
+ *	          MQTT_SUB_OPT_SEND_RETAIN_NEW - with this option set, pre-existing
+ *	                        retained messages for this subscription will be
+ *	                        sent when the subscription is made, but only if the
+ *	                        subscription does not already exist.
+ *	          MQTT_SUB_OPT_SEND_RETAIN_NEVER - with this option set,
+ *	                        pre-existing retained messages will never be sent
+ *	                        for this subscription.
+ * 	properties - a valid mosquitto_property list, or NULL.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS -        on success.
+ * 	MOSQ_ERR_INVAL -          if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -          if an out of memory condition occurred.
+ * 	MOSQ_ERR_NO_CONN -        if the client isn't connected to a broker.
+ * 	MOSQ_ERR_MALFORMED_UTF8 - if the topic is not valid UTF-8
+ *	MOSQ_ERR_DUPLICATE_PROPERTY - if a property is duplicated where it is forbidden.
+ *	MOSQ_ERR_PROTOCOL - if any property is invalid for use with SUBSCRIBE.
+ *	MOSQ_ERR_OVERSIZE_PACKET - if the resulting packet would be larger than
+ *	                           supported by the broker.
+ */
+libmosq_EXPORT int mosquitto_subscribe_v5(struct mosquitto *mosq, int *mid, const char *sub, int qos, int options, const mosquitto_property *properties);
+
+/*
+ * Function: mosquitto_subscribe_multiple
+ *
+ * Subscribe to multiple topics.
+ *
+ * Parameters:
+ *	mosq - a valid mosquitto instance.
+ *	mid -  a pointer to an int. If not NULL, the function will set this to
+ *	       the message id of this particular message. This can be then used
+ *	       with the subscribe callback to determine when the message has been
+ *	       sent.
+ *  sub_count - the count of subscriptions to be made
+ *	sub -  array of sub_count pointers, each pointing to a subscription string.
+ *	       The "char *const *const" datatype ensures that neither the array of
+ *	       pointers nor the strings that they point to are mutable. If you aren't
+ *	       familiar with this, just think of it as a safer "char **",
+ *	       equivalent to "const char *" for a simple string pointer.
+ *	qos -  the requested Quality of Service for each subscription.
+ *	options - options to apply to this subscription, OR'd together. Set to 0 to
+ *	       use the default options, otherwise choose from the list:
+ *	       MQTT_SUB_OPT_NO_LOCAL - with this option set, if this client
+ *	                     publishes to a topic to which it is subscribed, the
+ *	                     broker will not publish the message back to the
+ *	                     client.
+ *	       MQTT_SUB_OPT_RETAIN_AS_PUBLISHED - with this option set, messages
+ *	                     published for this subscription will keep the
+ *	                     retain flag as was set by the publishing client.
+ *	                     The default behaviour without this option set has
+ *	                     the retain flag indicating whether a message is
+ *	                     fresh/stale.
+ *	       MQTT_SUB_OPT_SEND_RETAIN_ALWAYS - with this option set,
+ *	                     pre-existing retained messages are sent as soon as
+ *	                     the subscription is made, even if the subscription
+ *	                     already exists. This is the default behaviour, so
+ *	                     it is not necessary to set this option.
+ *	       MQTT_SUB_OPT_SEND_RETAIN_NEW - with this option set, pre-existing
+ *	                     retained messages for this subscription will be
+ *	                     sent when the subscription is made, but only if the
+ *	                     subscription does not already exist.
+ *	       MQTT_SUB_OPT_SEND_RETAIN_NEVER - with this option set,
+ *	                     pre-existing retained messages will never be sent
+ *	                     for this subscription.
+ * 	properties - a valid mosquitto_property list, or NULL. Only used with MQTT
+ * 	             v5 clients.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS -        on success.
+ * 	MOSQ_ERR_INVAL -          if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -          if an out of memory condition occurred.
+ * 	MOSQ_ERR_NO_CONN -        if the client isn't connected to a broker.
+ * 	MOSQ_ERR_MALFORMED_UTF8 - if a topic is not valid UTF-8
+ *	MOSQ_ERR_OVERSIZE_PACKET - if the resulting packet would be larger than
+ *	                           supported by the broker.
+ */
+libmosq_EXPORT int mosquitto_subscribe_multiple(struct mosquitto *mosq, int *mid, int sub_count, char *const *const sub, int qos, int options, const mosquitto_property *properties);
+
+/*
+ * Function: mosquitto_unsubscribe
+ *
+ * Unsubscribe from a topic.
+ *
+ * Parameters:
+ *	mosq - a valid mosquitto instance.
+ *	mid -  a pointer to an int. If not NULL, the function will set this to
+ *	       the message id of this particular message. This can be then used
+ *	       with the unsubscribe callback to determine when the message has been
+ *	       sent.
+ *	sub -  the unsubscription pattern.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS -        on success.
+ * 	MOSQ_ERR_INVAL -          if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -          if an out of memory condition occurred.
+ * 	MOSQ_ERR_NO_CONN -        if the client isn't connected to a broker.
+ * 	MOSQ_ERR_MALFORMED_UTF8 - if the topic is not valid UTF-8
+ *	MOSQ_ERR_OVERSIZE_PACKET - if the resulting packet would be larger than
+ *	                           supported by the broker.
+ */
+libmosq_EXPORT int mosquitto_unsubscribe(struct mosquitto *mosq, int *mid, const char *sub);
+
+/*
+ * Function: mosquitto_unsubscribe_v5
+ *
+ * Unsubscribe from a topic, with attached MQTT properties.
+ *
+ * Parameters:
+ *	mosq - a valid mosquitto instance.
+ *	mid -  a pointer to an int. If not NULL, the function will set this to
+ *	       the message id of this particular message. This can be then used
+ *	       with the unsubscribe callback to determine when the message has been
+ *	       sent.
+ *	sub -  the unsubscription pattern.
+ * 	properties - a valid mosquitto_property list, or NULL. Only used with MQTT
+ * 	             v5 clients.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS -        on success.
+ * 	MOSQ_ERR_INVAL -          if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -          if an out of memory condition occurred.
+ * 	MOSQ_ERR_NO_CONN -        if the client isn't connected to a broker.
+ * 	MOSQ_ERR_MALFORMED_UTF8 - if the topic is not valid UTF-8
+ *	MOSQ_ERR_DUPLICATE_PROPERTY - if a property is duplicated where it is forbidden.
+ *	MOSQ_ERR_PROTOCOL - if any property is invalid for use with UNSUBSCRIBE.
+ *	MOSQ_ERR_OVERSIZE_PACKET - if the resulting packet would be larger than
+ *	                           supported by the broker.
+ */
+libmosq_EXPORT int mosquitto_unsubscribe_v5(struct mosquitto *mosq, int *mid, const char *sub, const mosquitto_property *properties);
+
+/*
+ * Function: mosquitto_unsubscribe_multiple
+ *
+ * Unsubscribe from multiple topics.
+ *
+ * Parameters:
+ *	mosq - a valid mosquitto instance.
+ *	mid -  a pointer to an int. If not NULL, the function will set this to
+ *	       the message id of this particular message. This can be then used
+ *	       with the subscribe callback to determine when the message has been
+ *	       sent.
+ *  sub_count - the count of unsubscriptions to be made
+ *	sub -  array of sub_count pointers, each pointing to an unsubscription string.
+ *	       The "char *const *const" datatype ensures that neither the array of
+ *	       pointers nor the strings that they point to are mutable. If you aren't
+ *	       familiar with this, just think of it as a safer "char **",
+ *	       equivalent to "const char *" for a simple string pointer.
+ * 	properties - a valid mosquitto_property list, or NULL. Only used with MQTT
+ * 	             v5 clients.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS -        on success.
+ * 	MOSQ_ERR_INVAL -          if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -          if an out of memory condition occurred.
+ * 	MOSQ_ERR_NO_CONN -        if the client isn't connected to a broker.
+ * 	MOSQ_ERR_MALFORMED_UTF8 - if a topic is not valid UTF-8
+ *	MOSQ_ERR_OVERSIZE_PACKET - if the resulting packet would be larger than
+ *	                           supported by the broker.
+ */
+libmosq_EXPORT int mosquitto_unsubscribe_multiple(struct mosquitto *mosq, int *mid, int sub_count, char *const *const sub, const mosquitto_property *properties);
+
+
+/* ======================================================================
+ *
+ * Section: Struct mosquitto_message helper functions
+ *
+ * ====================================================================== */
+/*
+ * Function: mosquitto_message_copy
+ *
+ * Copy the contents of a mosquitto message to another message.
+ * Useful for preserving a message received in the on_message() callback.
+ *
+ * Parameters:
+ *	dst - a pointer to a valid mosquitto_message struct to copy to.
+ *	src - a pointer to a valid mosquitto_message struct to copy from.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -   if an out of memory condition occurred.
+ *
+ * See Also:
+ * 	<mosquitto_message_free>
+ */
+libmosq_EXPORT int mosquitto_message_copy(struct mosquitto_message *dst, const struct mosquitto_message *src);
+
+/*
+ * Function: mosquitto_message_free
+ *
+ * Completely free a mosquitto_message struct.
+ *
+ * Parameters:
+ *	message - pointer to a mosquitto_message pointer to free.
+ *
+ * See Also:
+ * 	<mosquitto_message_copy>, <mosquitto_message_free_contents>
+ */
+libmosq_EXPORT void mosquitto_message_free(struct mosquitto_message **message);
+
+/*
+ * Function: mosquitto_message_free_contents
+ *
+ * Free a mosquitto_message struct contents, leaving the struct unaffected.
+ *
+ * Parameters:
+ *	message - pointer to a mosquitto_message struct to free its contents.
+ *
+ * See Also:
+ * 	<mosquitto_message_copy>, <mosquitto_message_free>
+ */
+libmosq_EXPORT void mosquitto_message_free_contents(struct mosquitto_message *message);
+
+
+/* ======================================================================
+ *
+ * Section: Network loop (managed by libmosquitto)
+ *
+ * ====================================================================== */
+/*
+ * Function: mosquitto_loop
+ *
+ * The main network loop for the client. You must call this frequently in order
+ * to keep communications between the client and broker working. If incoming
+ * data is present it will then be processed. Outgoing commands, from e.g.
+ * <mosquitto_publish>, are normally sent immediately that their function is
+ * called, but this is not always possible. <mosquitto_loop> will also attempt
+ * to send any remaining outgoing messages, which also includes commands that
+ * are part of the flow for messages with QoS>0.
+ *
+ * An alternative approach is to use <mosquitto_loop_start> to run the client
+ * loop in its own thread.
+ *
+ * This calls select() to monitor the client network socket. If you want to
+ * integrate mosquitto client operation with your own select() call, use
+ * <mosquitto_socket>, <mosquitto_loop_read>, <mosquitto_loop_write> and
+ * <mosquitto_loop_misc>.
+ *
+ * Threads:
+ *
+ * Parameters:
+ *	mosq -        a valid mosquitto instance.
+ *	timeout -     Maximum number of milliseconds to wait for network activity
+ *	              in the select() call before timing out. Set to 0 for instant
+ *	              return.  Set negative to use the default of 1000ms.
+ *	max_packets - this parameter is currently unused and should be set to 1 for
+ *	              future compatibility.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS -   on success.
+ * 	MOSQ_ERR_INVAL -     if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -     if an out of memory condition occurred.
+ * 	MOSQ_ERR_NO_CONN -   if the client isn't connected to a broker.
+ *  MOSQ_ERR_CONN_LOST - if the connection to the broker was lost.
+ *	MOSQ_ERR_PROTOCOL -  if there is a protocol error communicating with the
+ *                       broker.
+ * 	MOSQ_ERR_ERRNO -     if a system call returned an error. The variable errno
+ *                       contains the error code, even on Windows.
+ *                       Use strerror_r() where available or FormatMessage() on
+ *                       Windows.
+ * See Also:
+ *	<mosquitto_loop_forever>, <mosquitto_loop_start>, <mosquitto_loop_stop>
+ */
+libmosq_EXPORT int mosquitto_loop(struct mosquitto *mosq, int timeout, int max_packets);
+
+/*
+ * Function: mosquitto_loop_forever
+ *
+ * This function call loop() for you in an infinite blocking loop. It is useful
+ * for the case where you only want to run the MQTT client loop in your
+ * program.
+ *
+ * It handles reconnecting in case server connection is lost. If you call
+ * mosquitto_disconnect() in a callback it will return.
+ *
+ * Parameters:
+ *  mosq - a valid mosquitto instance.
+ *	timeout -     Maximum number of milliseconds to wait for network activity
+ *	              in the select() call before timing out. Set to 0 for instant
+ *	              return.  Set negative to use the default of 1000ms.
+ *	max_packets - this parameter is currently unused and should be set to 1 for
+ *	              future compatibility.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS -   on success.
+ * 	MOSQ_ERR_INVAL -     if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -     if an out of memory condition occurred.
+ * 	MOSQ_ERR_NO_CONN -   if the client isn't connected to a broker.
+ *  MOSQ_ERR_CONN_LOST - if the connection to the broker was lost.
+ *	MOSQ_ERR_PROTOCOL -  if there is a protocol error communicating with the
+ *                       broker.
+ * 	MOSQ_ERR_ERRNO -     if a system call returned an error. The variable errno
+ *                       contains the error code, even on Windows.
+ *                       Use strerror_r() where available or FormatMessage() on
+ *                       Windows.
+ *
+ * See Also:
+ *	<mosquitto_loop>, <mosquitto_loop_start>
+ */
+libmosq_EXPORT int mosquitto_loop_forever(struct mosquitto *mosq, int timeout, int max_packets);
+
+/*
+ * Function: mosquitto_loop_start
+ *
+ * This is part of the threaded client interface. Call this once to start a new
+ * thread to process network traffic. This provides an alternative to
+ * repeatedly calling <mosquitto_loop> yourself.
+ *
+ * Parameters:
+ *  mosq - a valid mosquitto instance.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS -       on success.
+ * 	MOSQ_ERR_INVAL -         if the input parameters were invalid.
+ *	MOSQ_ERR_NOT_SUPPORTED - if thread support is not available.
+ *
+ * See Also:
+ *	<mosquitto_connect_async>, <mosquitto_loop>, <mosquitto_loop_forever>, <mosquitto_loop_stop>
+ */
+libmosq_EXPORT int mosquitto_loop_start(struct mosquitto *mosq);
+
+/*
+ * Function: mosquitto_loop_stop
+ *
+ * This is part of the threaded client interface. Call this once to stop the
+ * network thread previously created with <mosquitto_loop_start>. This call
+ * will block until the network thread finishes. For the network thread to end,
+ * you must have previously called <mosquitto_disconnect> or have set the force
+ * parameter to true.
+ *
+ * Parameters:
+ *  mosq - a valid mosquitto instance.
+ *	force - set to true to force thread cancellation. If false,
+ *	        <mosquitto_disconnect> must have already been called.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS -       on success.
+ * 	MOSQ_ERR_INVAL -         if the input parameters were invalid.
+ *	MOSQ_ERR_NOT_SUPPORTED - if thread support is not available.
+ *
+ * See Also:
+ *	<mosquitto_loop>, <mosquitto_loop_start>
+ */
+libmosq_EXPORT int mosquitto_loop_stop(struct mosquitto *mosq, bool force);
+
+
+/* ======================================================================
+ *
+ * Section: Network loop (for use in other event loops)
+ *
+ * ====================================================================== */
+/*
+ * Function: mosquitto_loop_read
+ *
+ * Carry out network read operations.
+ * This should only be used if you are not using mosquitto_loop() and are
+ * monitoring the client network socket for activity yourself.
+ *
+ * Parameters:
+ *	mosq -        a valid mosquitto instance.
+ *	max_packets - this parameter is currently unused and should be set to 1 for
+ *	              future compatibility.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS -   on success.
+ * 	MOSQ_ERR_INVAL -     if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -     if an out of memory condition occurred.
+ * 	MOSQ_ERR_NO_CONN -   if the client isn't connected to a broker.
+ *  MOSQ_ERR_CONN_LOST - if the connection to the broker was lost.
+ *	MOSQ_ERR_PROTOCOL -  if there is a protocol error communicating with the
+ *                       broker.
+ * 	MOSQ_ERR_ERRNO -     if a system call returned an error. The variable errno
+ *                       contains the error code, even on Windows.
+ *                       Use strerror_r() where available or FormatMessage() on
+ *                       Windows.
+ *
+ * See Also:
+ *	<mosquitto_socket>, <mosquitto_loop_write>, <mosquitto_loop_misc>
+ */
+libmosq_EXPORT int mosquitto_loop_read(struct mosquitto *mosq, int max_packets);
+
+/*
+ * Function: mosquitto_loop_write
+ *
+ * Carry out network write operations.
+ * This should only be used if you are not using mosquitto_loop() and are
+ * monitoring the client network socket for activity yourself.
+ *
+ * Parameters:
+ *	mosq -        a valid mosquitto instance.
+ *	max_packets - this parameter is currently unused and should be set to 1 for
+ *	              future compatibility.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS -   on success.
+ * 	MOSQ_ERR_INVAL -     if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -     if an out of memory condition occurred.
+ * 	MOSQ_ERR_NO_CONN -   if the client isn't connected to a broker.
+ *  MOSQ_ERR_CONN_LOST - if the connection to the broker was lost.
+ *	MOSQ_ERR_PROTOCOL -  if there is a protocol error communicating with the
+ *                       broker.
+ * 	MOSQ_ERR_ERRNO -     if a system call returned an error. The variable errno
+ *                       contains the error code, even on Windows.
+ *                       Use strerror_r() where available or FormatMessage() on
+ *                       Windows.
+ *
+ * See Also:
+ *	<mosquitto_socket>, <mosquitto_loop_read>, <mosquitto_loop_misc>, <mosquitto_want_write>
+ */
+libmosq_EXPORT int mosquitto_loop_write(struct mosquitto *mosq, int max_packets);
+
+/*
+ * Function: mosquitto_loop_misc
+ *
+ * Carry out miscellaneous operations required as part of the network loop.
+ * This should only be used if you are not using mosquitto_loop() and are
+ * monitoring the client network socket for activity yourself.
+ *
+ * This function deals with handling PINGs and checking whether messages need
+ * to be retried, so should be called fairly frequently.
+ *
+ * Parameters:
+ *	mosq - a valid mosquitto instance.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS -   on success.
+ * 	MOSQ_ERR_INVAL -     if the input parameters were invalid.
+ * 	MOSQ_ERR_NO_CONN -   if the client isn't connected to a broker.
+ *
+ * See Also:
+ *	<mosquitto_socket>, <mosquitto_loop_read>, <mosquitto_loop_write>
+ */
+libmosq_EXPORT int mosquitto_loop_misc(struct mosquitto *mosq);
+
+
+/* ======================================================================
+ *
+ * Section: Network loop (helper functions)
+ *
+ * ====================================================================== */
+/*
+ * Function: mosquitto_socket
+ *
+ * Return the socket handle for a mosquitto instance. Useful if you want to
+ * include a mosquitto client in your own select() calls.
+ *
+ * Parameters:
+ *	mosq - a valid mosquitto instance.
+ *
+ * Returns:
+ *	The socket for the mosquitto client or -1 on failure.
+ */
+libmosq_EXPORT int mosquitto_socket(struct mosquitto *mosq);
+
+/*
+ * Function: mosquitto_want_write
+ *
+ * Returns true if there is data ready to be written on the socket.
+ *
+ * Parameters:
+ *	mosq - a valid mosquitto instance.
+ *
+ * See Also:
+ *	<mosquitto_socket>, <mosquitto_loop_read>, <mosquitto_loop_write>
+ */
+libmosq_EXPORT bool mosquitto_want_write(struct mosquitto *mosq);
+
+/*
+ * Function: mosquitto_threaded_set
+ *
+ * Used to tell the library that your application is using threads, but not
+ * using <mosquitto_loop_start>. The library operates slightly differently when
+ * not in threaded mode in order to simplify its operation. If you are managing
+ * your own threads and do not use this function you will experience crashes
+ * due to race conditions.
+ *
+ * When using <mosquitto_loop_start>, this is set automatically.
+ *
+ * Parameters:
+ *  mosq -     a valid mosquitto instance.
+ *  threaded - true if your application is using threads, false otherwise.
+ */
+libmosq_EXPORT int mosquitto_threaded_set(struct mosquitto *mosq, bool threaded);
+
+
+/* ======================================================================
+ *
+ * Section: Client options
+ *
+ * ====================================================================== */
+/*
+ * Function: mosquitto_opts_set
+ *
+ * Used to set options for the client.
+ *
+ * This function is deprecated, the replacement <mosquitto_int_option> and
+ * <mosquitto_void_option> functions should be used instead.
+ *
+ * Parameters:
+ *	mosq -   a valid mosquitto instance.
+ *	option - the option to set.
+ *	value -  the option specific value.
+ *
+ * Options:
+ *	MOSQ_OPT_PROTOCOL_VERSION
+ *	          Value must be an int, set to either MQTT_PROTOCOL_V31 or
+ *	          MQTT_PROTOCOL_V311. Must be set before the client connects.
+ *	          Defaults to MQTT_PROTOCOL_V31.
+ *
+ *	MOSQ_OPT_SSL_CTX
+ *	          Pass an openssl SSL_CTX to be used when creating TLS connections
+ *	          rather than libmosquitto creating its own.  This must be called
+ *	          before connecting to have any effect. If you use this option, the
+ *	          onus is on you to ensure that you are using secure settings.
+ *	          Setting to NULL means that libmosquitto will use its own SSL_CTX
+ *	          if TLS is to be used.
+ *	          This option is only available for openssl 1.1.0 and higher.
+ *
+ *	MOSQ_OPT_SSL_CTX_WITH_DEFAULTS
+ *	          Value must be an int set to 1 or 0. If set to 1, then the user
+ *	          specified SSL_CTX passed in using MOSQ_OPT_SSL_CTX will have the
+ *	          default options applied to it. This means that you only need to
+ *	          change the values that are relevant to you. If you use this
+ *	          option then you must configure the TLS options as normal, i.e.
+ *	          you should use <mosquitto_tls_set> to configure the cafile/capath
+ *	          as a minimum.
+ *	          This option is only available for openssl 1.1.0 and higher.
+ */
+libmosq_EXPORT int mosquitto_opts_set(struct mosquitto *mosq, enum mosq_opt_t option, void *value);
+
+/*
+ * Function: mosquitto_int_option
+ *
+ * Used to set integer options for the client.
+ *
+ * Parameters:
+ *	mosq -   a valid mosquitto instance.
+ *	option - the option to set.
+ *	value -  the option specific value.
+ *
+ * Options:
+ *	MOSQ_OPT_PROTOCOL_VERSION
+ *	          Value must be set to either MQTT_PROTOCOL_V31,
+ *	          MQTT_PROTOCOL_V311, or MQTT_PROTOCOL_V5. Must be set before the
+ *	          client connects.  Defaults to MQTT_PROTOCOL_V311.
+ *
+ *	MOSQ_OPT_RECEIVE_MAXIMUM
+ *	          Value can be set between 1 and 65535 inclusive, and represents
+ *	          the maximum number of incoming QoS 1 and QoS 2 messages that this
+ *	          client wants to process at once. Defaults to 20. This option is
+ *	          not valid for MQTT v3.1 or v3.1.1 clients.
+ *	          Note that if the MQTT_PROP_RECEIVE_MAXIMUM property is in the
+ *	          proplist passed to mosquitto_connect_v5(), then that property
+ *	          will override this option. Using this option is the recommended
+ *	          method however.
+ *
+ *	MOSQ_OPT_SEND_MAXIMUM
+ *	          Value can be set between 1 and 65535 inclusive, and represents
+ *	          the maximum number of outgoing QoS 1 and QoS 2 messages that this
+ *	          client will attempt to have "in flight" at once. Defaults to 20.
+ *	          This option is not valid for MQTT v3.1 or v3.1.1 clients.
+ *	          Note that if the broker being connected to sends a
+ *	          MQTT_PROP_RECEIVE_MAXIMUM property that has a lower value than
+ *	          this option, then the broker provided value will be used.
+ *
+ *	MOSQ_OPT_SSL_CTX_WITH_DEFAULTS
+ *	          If value is set to a non zero value, then the user specified
+ *	          SSL_CTX passed in using MOSQ_OPT_SSL_CTX will have the default
+ *	          options applied to it. This means that you only need to change
+ *	          the values that are relevant to you. If you use this option then
+ *	          you must configure the TLS options as normal, i.e.  you should
+ *	          use <mosquitto_tls_set> to configure the cafile/capath as a
+ *	          minimum.
+ *	          This option is only available for openssl 1.1.0 and higher.
+ *	MOSQ_OPT_TLS_OCSP_REQUIRED
+ *	          Set whether OCSP checking on TLS connections is required. Set to
+ *	          1 to enable checking, or 0 (the default) for no checking.
+ */
+libmosq_EXPORT int mosquitto_int_option(struct mosquitto *mosq, enum mosq_opt_t option, int value);
+
+
+/*
+ * Function: mosquitto_void_option
+ *
+ * Used to set void* options for the client.
+ *
+ * Parameters:
+ *	mosq -   a valid mosquitto instance.
+ *	option - the option to set.
+ *	value -  the option specific value.
+ *
+ * Options:
+ *	MOSQ_OPT_SSL_CTX
+ *	          Pass an openssl SSL_CTX to be used when creating TLS connections
+ *	          rather than libmosquitto creating its own.  This must be called
+ *	          before connecting to have any effect. If you use this option, the
+ *	          onus is on you to ensure that you are using secure settings.
+ *	          Setting to NULL means that libmosquitto will use its own SSL_CTX
+ *	          if TLS is to be used.
+ *	          This option is only available for openssl 1.1.0 and higher.
+ */
+libmosq_EXPORT int mosquitto_void_option(struct mosquitto *mosq, enum mosq_opt_t option, void *value);
+
+
+/*
+ * Function: mosquitto_reconnect_delay_set
+ *
+ * Control the behaviour of the client when it has unexpectedly disconnected in
+ * <mosquitto_loop_forever> or after <mosquitto_loop_start>. The default
+ * behaviour if this function is not used is to repeatedly attempt to reconnect
+ * with a delay of 1 second until the connection succeeds.
+ *
+ * Use reconnect_delay parameter to change the delay between successive
+ * reconnection attempts. You may also enable exponential backoff of the time
+ * between reconnections by setting reconnect_exponential_backoff to true and
+ * set an upper bound on the delay with reconnect_delay_max.
+ *
+ * Example 1:
+ *	delay=2, delay_max=10, exponential_backoff=False
+ *	Delays would be: 2, 4, 6, 8, 10, 10, ...
+ *
+ * Example 2:
+ *	delay=3, delay_max=30, exponential_backoff=True
+ *	Delays would be: 3, 6, 12, 24, 30, 30, ...
+ *
+ * Parameters:
+ *  mosq -                          a valid mosquitto instance.
+ *  reconnect_delay -               the number of seconds to wait between
+ *                                  reconnects.
+ *  reconnect_delay_max -           the maximum number of seconds to wait
+ *                                  between reconnects.
+ *  reconnect_exponential_backoff - use exponential backoff between
+ *                                  reconnect attempts. Set to true to enable
+ *                                  exponential backoff.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ */
+libmosq_EXPORT int mosquitto_reconnect_delay_set(struct mosquitto *mosq, unsigned int reconnect_delay, unsigned int reconnect_delay_max, bool reconnect_exponential_backoff);
+
+/*
+ * Function: mosquitto_max_inflight_messages_set
+ *
+ * This function is deprected. Use the <mosquitto_int_option> function with the
+ * MOSQ_OPT_SEND_MAXIMUM option instead.
+ *
+ * Set the number of QoS 1 and 2 messages that can be "in flight" at one time.
+ * An in flight message is part way through its delivery flow. Attempts to send
+ * further messages with <mosquitto_publish> will result in the messages being
+ * queued until the number of in flight messages reduces.
+ *
+ * A higher number here results in greater message throughput, but if set
+ * higher than the maximum in flight messages on the broker may lead to
+ * delays in the messages being acknowledged.
+ *
+ * Set to 0 for no maximum.
+ *
+ * Parameters:
+ *  mosq -                  a valid mosquitto instance.
+ *  max_inflight_messages - the maximum number of inflight messages. Defaults
+ *                          to 20.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ */
+libmosq_EXPORT int mosquitto_max_inflight_messages_set(struct mosquitto *mosq, unsigned int max_inflight_messages);
+
+/*
+ * Function: mosquitto_message_retry_set
+ *
+ * This function now has no effect.
+ */
+libmosq_EXPORT void mosquitto_message_retry_set(struct mosquitto *mosq, unsigned int message_retry);
+
+/*
+ * Function: mosquitto_user_data_set
+ *
+ * When <mosquitto_new> is called, the pointer given as the "obj" parameter
+ * will be passed to the callbacks as user data. The <mosquitto_user_data_set>
+ * function allows this obj parameter to be updated at any time. This function
+ * will not modify the memory pointed to by the current user data pointer. If
+ * it is dynamically allocated memory you must free it yourself.
+ *
+ * Parameters:
+ *  mosq - a valid mosquitto instance.
+ * 	obj -  A user pointer that will be passed as an argument to any callbacks
+ * 	       that are specified.
+ */
+libmosq_EXPORT void mosquitto_user_data_set(struct mosquitto *mosq, void *obj);
+
+/* Function: mosquitto_userdata
+ *
+ * Retrieve the "userdata" variable for a mosquitto client.
+ *
+ * Parameters:
+ * 	mosq - a valid mosquitto instance.
+ *
+ * Returns:
+ *	A pointer to the userdata member variable.
+ */
+libmosq_EXPORT void *mosquitto_userdata(struct mosquitto *mosq);
+
+
+/* ======================================================================
+ *
+ * Section: TLS support
+ *
+ * ====================================================================== */
+/*
+ * Function: mosquitto_tls_set
+ *
+ * Configure the client for certificate based SSL/TLS support. Must be called
+ * before <mosquitto_connect>.
+ *
+ * Cannot be used in conjunction with <mosquitto_tls_psk_set>.
+ *
+ * Define the Certificate Authority certificates to be trusted (ie. the server
+ * certificate must be signed with one of these certificates) using cafile.
+ *
+ * If the server you are connecting to requires clients to provide a
+ * certificate, define certfile and keyfile with your client certificate and
+ * private key. If your private key is encrypted, provide a password callback
+ * function or you will have to enter the password at the command line.
+ *
+ * Parameters:
+ *  mosq -        a valid mosquitto instance.
+ *  cafile -      path to a file containing the PEM encoded trusted CA
+ *                certificate files. Either cafile or capath must not be NULL.
+ *  capath -      path to a directory containing the PEM encoded trusted CA
+ *                certificate files. See mosquitto.conf for more details on
+ *                configuring this directory. Either cafile or capath must not
+ *                be NULL.
+ *  certfile -    path to a file containing the PEM encoded certificate file
+ *                for this client. If NULL, keyfile must also be NULL and no
+ *                client certificate will be used.
+ *  keyfile -     path to a file containing the PEM encoded private key for
+ *                this client. If NULL, certfile must also be NULL and no
+ *                client certificate will be used.
+ *  pw_callback - if keyfile is encrypted, set pw_callback to allow your client
+ *                to pass the correct password for decryption. If set to NULL,
+ *                the password must be entered on the command line.
+ *                Your callback must write the password into "buf", which is
+ *                "size" bytes long. The return value must be the length of the
+ *                password. "userdata" will be set to the calling mosquitto
+ *                instance. The mosquitto userdata member variable can be
+ *                retrieved using <mosquitto_userdata>.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -   if an out of memory condition occurred.
+ *
+ * See Also:
+ *	<mosquitto_tls_opts_set>, <mosquitto_tls_psk_set>,
+ *	<mosquitto_tls_insecure_set>, <mosquitto_userdata>
+ */
+libmosq_EXPORT int mosquitto_tls_set(struct mosquitto *mosq,
+		const char *cafile, const char *capath,
+		const char *certfile, const char *keyfile,
+		int (*pw_callback)(char *buf, int size, int rwflag, void *userdata));
+
+/*
+ * Function: mosquitto_tls_insecure_set
+ *
+ * Configure verification of the server hostname in the server certificate. If
+ * value is set to true, it is impossible to guarantee that the host you are
+ * connecting to is not impersonating your server. This can be useful in
+ * initial server testing, but makes it possible for a malicious third party to
+ * impersonate your server through DNS spoofing, for example.
+ * Do not use this function in a real system. Setting value to true makes the
+ * connection encryption pointless.
+ * Must be called before <mosquitto_connect>.
+ *
+ * Parameters:
+ *  mosq -  a valid mosquitto instance.
+ *  value - if set to false, the default, certificate hostname checking is
+ *          performed. If set to true, no hostname checking is performed and
+ *          the connection is insecure.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ *
+ * See Also:
+ *	<mosquitto_tls_set>
+ */
+libmosq_EXPORT int mosquitto_tls_insecure_set(struct mosquitto *mosq, bool value);
+
+/*
+ * Function: mosquitto_tls_opts_set
+ *
+ * Set advanced SSL/TLS options. Must be called before <mosquitto_connect>.
+ *
+ * Parameters:
+ *  mosq -        a valid mosquitto instance.
+ *	cert_reqs -   an integer defining the verification requirements the client
+ *	              will impose on the server. This can be one of:
+ *	              * SSL_VERIFY_NONE (0): the server will not be verified in any way.
+ *	              * SSL_VERIFY_PEER (1): the server certificate will be verified
+ *	                and the connection aborted if the verification fails.
+ *	              The default and recommended value is SSL_VERIFY_PEER. Using
+ *	              SSL_VERIFY_NONE provides no security.
+ *	tls_version - the version of the SSL/TLS protocol to use as a string. If NULL,
+ *	              the default value is used. The default value and the
+ *	              available values depend on the version of openssl that the
+ *	              library was compiled against. For openssl >= 1.0.1, the
+ *	              available options are tlsv1.2, tlsv1.1 and tlsv1, with tlv1.2
+ *	              as the default. For openssl < 1.0.1, only tlsv1 is available.
+ *	ciphers -     a string describing the ciphers available for use. See the
+ *	              "openssl ciphers" tool for more information. If NULL, the
+ *	              default ciphers will be used.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -   if an out of memory condition occurred.
+ *
+ * See Also:
+ *	<mosquitto_tls_set>
+ */
+libmosq_EXPORT int mosquitto_tls_opts_set(struct mosquitto *mosq, int cert_reqs, const char *tls_version, const char *ciphers);
+
+/*
+ * Function: mosquitto_tls_psk_set
+ *
+ * Configure the client for pre-shared-key based TLS support. Must be called
+ * before <mosquitto_connect>.
+ *
+ * Cannot be used in conjunction with <mosquitto_tls_set>.
+ *
+ * Parameters:
+ *  mosq -     a valid mosquitto instance.
+ *  psk -      the pre-shared-key in hex format with no leading "0x".
+ *  identity - the identity of this client. May be used as the username
+ *             depending on the server settings.
+ *	ciphers -  a string describing the PSK ciphers available for use. See the
+ *	           "openssl ciphers" tool for more information. If NULL, the
+ *	           default ciphers will be used.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -   if an out of memory condition occurred.
+ *
+ * See Also:
+ *	<mosquitto_tls_set>
+ */
+libmosq_EXPORT int mosquitto_tls_psk_set(struct mosquitto *mosq, const char *psk, const char *identity, const char *ciphers);
+
+
+/* ======================================================================
+ *
+ * Section: Callbacks
+ *
+ * ====================================================================== */
+/*
+ * Function: mosquitto_connect_callback_set
+ *
+ * Set the connect callback. This is called when the broker sends a CONNACK
+ * message in response to a connection.
+ *
+ * Parameters:
+ *  mosq -       a valid mosquitto instance.
+ *  on_connect - a callback function in the following form:
+ *               void callback(struct mosquitto *mosq, void *obj, int rc)
+ *
+ * Callback Parameters:
+ *  mosq - the mosquitto instance making the callback.
+ *  obj - the user data provided in <mosquitto_new>
+ *  rc -  the return code of the connection response, one of:
+ *
+ * * 0 - success
+ * * 1 - connection refused (unacceptable protocol version)
+ * * 2 - connection refused (identifier rejected)
+ * * 3 - connection refused (broker unavailable)
+ * * 4-255 - reserved for future use
+ */
+libmosq_EXPORT void mosquitto_connect_callback_set(struct mosquitto *mosq, void (*on_connect)(struct mosquitto *, void *, int));
+
+/*
+ * Function: mosquitto_connect_with_flags_callback_set
+ *
+ * Set the connect callback. This is called when the broker sends a CONNACK
+ * message in response to a connection.
+ *
+ * Parameters:
+ *  mosq -       a valid mosquitto instance.
+ *  on_connect - a callback function in the following form:
+ *               void callback(struct mosquitto *mosq, void *obj, int rc)
+ *
+ * Callback Parameters:
+ *  mosq - the mosquitto instance making the callback.
+ *  obj - the user data provided in <mosquitto_new>
+ *  rc -  the return code of the connection response, one of:
+ *  flags - the connect flags.
+ *
+ * * 0 - success
+ * * 1 - connection refused (unacceptable protocol version)
+ * * 2 - connection refused (identifier rejected)
+ * * 3 - connection refused (broker unavailable)
+ * * 4-255 - reserved for future use
+ */
+libmosq_EXPORT void mosquitto_connect_with_flags_callback_set(struct mosquitto *mosq, void (*on_connect)(struct mosquitto *, void *, int, int));
+
+/*
+ * Function: mosquitto_connect_v5_callback_set
+ *
+ * Set the connect callback. This is called when the broker sends a CONNACK
+ * message in response to a connection.
+ *
+ * Parameters:
+ *  mosq -       a valid mosquitto instance.
+ *  on_connect - a callback function in the following form:
+ *               void callback(struct mosquitto *mosq, void *obj, int rc)
+ *
+ * Callback Parameters:
+ *  mosq - the mosquitto instance making the callback.
+ *  obj - the user data provided in <mosquitto_new>
+ *  rc -  the return code of the connection response, one of:
+ * * 0 - success
+ * * 1 - connection refused (unacceptable protocol version)
+ * * 2 - connection refused (identifier rejected)
+ * * 3 - connection refused (broker unavailable)
+ * * 4-255 - reserved for future use
+ *  flags - the connect flags.
+ *  props - list of MQTT 5 properties, or NULL
+ *
+ */
+libmosq_EXPORT void mosquitto_connect_v5_callback_set(struct mosquitto *mosq, void (*on_connect)(struct mosquitto *, void *, int, int, const mosquitto_property *props));
+
+/*
+ * Function: mosquitto_disconnect_callback_set
+ *
+ * Set the disconnect callback. This is called when the broker has received the
+ * DISCONNECT command and has disconnected the client.
+ *
+ * Parameters:
+ *  mosq -          a valid mosquitto instance.
+ *  on_disconnect - a callback function in the following form:
+ *                  void callback(struct mosquitto *mosq, void *obj)
+ *
+ * Callback Parameters:
+ *  mosq - the mosquitto instance making the callback.
+ *  obj -  the user data provided in <mosquitto_new>
+ *  rc -   integer value indicating the reason for the disconnect. A value of 0
+ *         means the client has called <mosquitto_disconnect>. Any other value
+ *         indicates that the disconnect is unexpected.
+ */
+libmosq_EXPORT void mosquitto_disconnect_callback_set(struct mosquitto *mosq, void (*on_disconnect)(struct mosquitto *, void *, int));
+
+/*
+ * Function: mosquitto_disconnect_v5_callback_set
+ *
+ * Set the disconnect callback. This is called when the broker has received the
+ * DISCONNECT command and has disconnected the client.
+ *
+ * Parameters:
+ *  mosq -          a valid mosquitto instance.
+ *  on_disconnect - a callback function in the following form:
+ *                  void callback(struct mosquitto *mosq, void *obj)
+ *
+ * Callback Parameters:
+ *  mosq - the mosquitto instance making the callback.
+ *  obj -  the user data provided in <mosquitto_new>
+ *  rc -   integer value indicating the reason for the disconnect. A value of 0
+ *         means the client has called <mosquitto_disconnect>. Any other value
+ *         indicates that the disconnect is unexpected.
+ *  props - list of MQTT 5 properties, or NULL
+ */
+libmosq_EXPORT void mosquitto_disconnect_v5_callback_set(struct mosquitto *mosq, void (*on_disconnect)(struct mosquitto *, void *, int, const mosquitto_property *));
+
+/*
+ * Function: mosquitto_publish_callback_set
+ *
+ * Set the publish callback. This is called when a message initiated with
+ * <mosquitto_publish> has been sent to the broker successfully.
+ *
+ * Parameters:
+ *  mosq -       a valid mosquitto instance.
+ *  on_publish - a callback function in the following form:
+ *               void callback(struct mosquitto *mosq, void *obj, int mid)
+ *
+ * Callback Parameters:
+ *  mosq - the mosquitto instance making the callback.
+ *  obj -  the user data provided in <mosquitto_new>
+ *  mid -  the message id of the sent message.
+ */
+libmosq_EXPORT void mosquitto_publish_callback_set(struct mosquitto *mosq, void (*on_publish)(struct mosquitto *, void *, int));
+
+/*
+ * Function: mosquitto_publish_v5_callback_set
+ *
+ * Set the publish callback. This is called when a message initiated with
+ * <mosquitto_publish> has been sent to the broker. This callback will be
+ * called both if the message is sent successfully, or if the broker responded
+ * with an error, which will be reflected in the reason_code parameter.
+ *
+ * Parameters:
+ *  mosq -       a valid mosquitto instance.
+ *  on_publish - a callback function in the following form:
+ *               void callback(struct mosquitto *mosq, void *obj, int mid)
+ *
+ * Callback Parameters:
+ *  mosq - the mosquitto instance making the callback.
+ *  obj -  the user data provided in <mosquitto_new>
+ *  mid -  the message id of the sent message.
+ *  reason_code - the MQTT 5 reason code
+ *  props - list of MQTT 5 properties, or NULL
+ */
+libmosq_EXPORT void mosquitto_publish_v5_callback_set(struct mosquitto *mosq, void (*on_publish)(struct mosquitto *, void *, int, int, const mosquitto_property *));
+
+/*
+ * Function: mosquitto_message_callback_set
+ *
+ * Set the message callback. This is called when a message is received from the
+ * broker.
+ *
+ * Parameters:
+ *  mosq -       a valid mosquitto instance.
+ *  on_message - a callback function in the following form:
+ *               void callback(struct mosquitto *mosq, void *obj, const struct mosquitto_message *message)
+ *
+ * Callback Parameters:
+ *  mosq -    the mosquitto instance making the callback.
+ *  obj -     the user data provided in <mosquitto_new>
+ *  message - the message data. This variable and associated memory will be
+ *            freed by the library after the callback completes. The client
+ *            should make copies of any of the data it requires.
+ *
+ * See Also:
+ * 	<mosquitto_message_copy>
+ */
+libmosq_EXPORT void mosquitto_message_callback_set(struct mosquitto *mosq, void (*on_message)(struct mosquitto *, void *, const struct mosquitto_message *));
+
+/*
+ * Function: mosquitto_message_v5_callback_set
+ *
+ * Set the message callback. This is called when a message is received from the
+ * broker.
+ *
+ * Parameters:
+ *  mosq -       a valid mosquitto instance.
+ *  on_message - a callback function in the following form:
+ *               void callback(struct mosquitto *mosq, void *obj, const struct mosquitto_message *message)
+ *
+ * Callback Parameters:
+ *  mosq -    the mosquitto instance making the callback.
+ *  obj -     the user data provided in <mosquitto_new>
+ *  message - the message data. This variable and associated memory will be
+ *            freed by the library after the callback completes. The client
+ *            should make copies of any of the data it requires.
+ *  props - list of MQTT 5 properties, or NULL
+ *
+ * See Also:
+ * 	<mosquitto_message_copy>
+ */
+libmosq_EXPORT void mosquitto_message_v5_callback_set(struct mosquitto *mosq, void (*on_message)(struct mosquitto *, void *, const struct mosquitto_message *, const mosquitto_property *));
+
+/*
+ * Function: mosquitto_subscribe_callback_set
+ *
+ * Set the subscribe callback. This is called when the broker responds to a
+ * subscription request.
+ *
+ * Parameters:
+ *  mosq -         a valid mosquitto instance.
+ *  on_subscribe - a callback function in the following form:
+ *                 void callback(struct mosquitto *mosq, void *obj, int mid, int qos_count, const int *granted_qos)
+ *
+ * Callback Parameters:
+ *  mosq -        the mosquitto instance making the callback.
+ *  obj -         the user data provided in <mosquitto_new>
+ *  mid -         the message id of the subscribe message.
+ *  qos_count -   the number of granted subscriptions (size of granted_qos).
+ *  granted_qos - an array of integers indicating the granted QoS for each of
+ *                the subscriptions.
+ */
+libmosq_EXPORT void mosquitto_subscribe_callback_set(struct mosquitto *mosq, void (*on_subscribe)(struct mosquitto *, void *, int, int, const int *));
+
+/*
+ * Function: mosquitto_subscribe_v5_callback_set
+ *
+ * Set the subscribe callback. This is called when the broker responds to a
+ * subscription request.
+ *
+ * Parameters:
+ *  mosq -         a valid mosquitto instance.
+ *  on_subscribe - a callback function in the following form:
+ *                 void callback(struct mosquitto *mosq, void *obj, int mid, int qos_count, const int *granted_qos)
+ *
+ * Callback Parameters:
+ *  mosq -        the mosquitto instance making the callback.
+ *  obj -         the user data provided in <mosquitto_new>
+ *  mid -         the message id of the subscribe message.
+ *  qos_count -   the number of granted subscriptions (size of granted_qos).
+ *  granted_qos - an array of integers indicating the granted QoS for each of
+ *                the subscriptions.
+ *  props - list of MQTT 5 properties, or NULL
+ */
+libmosq_EXPORT void mosquitto_subscribe_v5_callback_set(struct mosquitto *mosq, void (*on_subscribe)(struct mosquitto *, void *, int, int, const int *, const mosquitto_property *));
+
+/*
+ * Function: mosquitto_unsubscribe_callback_set
+ *
+ * Set the unsubscribe callback. This is called when the broker responds to a
+ * unsubscription request.
+ *
+ * Parameters:
+ *  mosq -           a valid mosquitto instance.
+ *  on_unsubscribe - a callback function in the following form:
+ *                   void callback(struct mosquitto *mosq, void *obj, int mid)
+ *
+ * Callback Parameters:
+ *  mosq - the mosquitto instance making the callback.
+ *  obj -  the user data provided in <mosquitto_new>
+ *  mid -  the message id of the unsubscribe message.
+ */
+libmosq_EXPORT void mosquitto_unsubscribe_callback_set(struct mosquitto *mosq, void (*on_unsubscribe)(struct mosquitto *, void *, int));
+
+/*
+ * Function: mosquitto_unsubscribe_v5_callback_set
+ *
+ * Set the unsubscribe callback. This is called when the broker responds to a
+ * unsubscription request.
+ *
+ * Parameters:
+ *  mosq -           a valid mosquitto instance.
+ *  on_unsubscribe - a callback function in the following form:
+ *                   void callback(struct mosquitto *mosq, void *obj, int mid)
+ *
+ * Callback Parameters:
+ *  mosq - the mosquitto instance making the callback.
+ *  obj -  the user data provided in <mosquitto_new>
+ *  mid -  the message id of the unsubscribe message.
+ *  props - list of MQTT 5 properties, or NULL
+ */
+libmosq_EXPORT void mosquitto_unsubscribe_v5_callback_set(struct mosquitto *mosq, void (*on_unsubscribe)(struct mosquitto *, void *, int, const mosquitto_property *));
+
+/*
+ * Function: mosquitto_log_callback_set
+ *
+ * Set the logging callback. This should be used if you want event logging
+ * information from the client library.
+ *
+ *  mosq -   a valid mosquitto instance.
+ *  on_log - a callback function in the following form:
+ *           void callback(struct mosquitto *mosq, void *obj, int level, const char *str)
+ *
+ * Callback Parameters:
+ *  mosq -  the mosquitto instance making the callback.
+ *  obj -   the user data provided in <mosquitto_new>
+ *  level - the log message level from the values:
+ *	        MOSQ_LOG_INFO
+ *	        MOSQ_LOG_NOTICE
+ *	        MOSQ_LOG_WARNING
+ *	        MOSQ_LOG_ERR
+ *	        MOSQ_LOG_DEBUG
+ *	str -   the message string.
+ */
+libmosq_EXPORT void mosquitto_log_callback_set(struct mosquitto *mosq, void (*on_log)(struct mosquitto *, void *, int, const char *));
+
+/*
+ * Function: mosquitto_string_option
+ *
+ * Used to set const char* options for the client.
+ *
+ * Parameters:
+ *	mosq -   a valid mosquitto instance.
+ *	option - the option to set.
+ *	value -  the option specific value.
+ *
+ * Options:
+ *	MOSQ_OPT_TLS_ENGINE
+ *	          Configure the client for TLS Engine support. Pass a TLS Engine ID
+ *	          to be used when creating TLS connections.
+ *	          Must be set before <mosquitto_connect>.
+ *	MOSQ_OPT_TLS_KEYFORM
+ *            Configure the client to treat the keyfile differently depending
+ *            on its type.  Must be set before <mosquitto_connect>.
+ *	          Set as either "pem" or "engine", to determine from where the
+ *	          private key for a TLS connection will be obtained. Defaults to
+ *	          "pem", a normal private key file.
+ *	MOSQ_OPT_TLS_KPASS_SHA1
+ *	          Where the TLS Engine requires the use of a password to be
+ *	          accessed, this option allows a hex encoded SHA1 hash of the
+ *	          private key password to be passed to the engine directly.
+ *	          Must be set before <mosquitto_connect>.
+ *	MOSQ_OPT_TLS_ALPN
+ *	          If the broker being connected to has multiple services available
+ *	          on a single TLS port, such as both MQTT and WebSockets, use this
+ *	          option to configure the ALPN option for the connection.
+ */
+libmosq_EXPORT int mosquitto_string_option(struct mosquitto *mosq, enum mosq_opt_t option, const char *value);
+
+
+/*
+ * Function: mosquitto_reconnect_delay_set
+ *
+ * Control the behaviour of the client when it has unexpectedly disconnected in
+ * <mosquitto_loop_forever> or after <mosquitto_loop_start>. The default
+ * behaviour if this function is not used is to repeatedly attempt to reconnect
+ * with a delay of 1 second until the connection succeeds.
+ *
+ * Use reconnect_delay parameter to change the delay between successive
+ * reconnection attempts. You may also enable exponential backoff of the time
+ * between reconnections by setting reconnect_exponential_backoff to true and
+ * set an upper bound on the delay with reconnect_delay_max.
+ *
+ * Example 1:
+ *	delay=2, delay_max=10, exponential_backoff=False
+ *	Delays would be: 2, 4, 6, 8, 10, 10, ...
+ *
+ * Example 2:
+ *	delay=3, delay_max=30, exponential_backoff=True
+ *	Delays would be: 3, 6, 12, 24, 30, 30, ...
+ *
+ * Parameters:
+ *  mosq -                          a valid mosquitto instance.
+ *  reconnect_delay -               the number of seconds to wait between
+ *                                  reconnects.
+ *  reconnect_delay_max -           the maximum number of seconds to wait
+ *                                  between reconnects.
+ *  reconnect_exponential_backoff - use exponential backoff between
+ *                                  reconnect attempts. Set to true to enable
+ *                                  exponential backoff.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success.
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ */
+libmosq_EXPORT int mosquitto_reconnect_delay_set(struct mosquitto *mosq, unsigned int reconnect_delay, unsigned int reconnect_delay_max, bool reconnect_exponential_backoff);
+
+
+/* =============================================================================
+ *
+ * Section: SOCKS5 proxy functions
+ *
+ * =============================================================================
+ */
+
+/*
+ * Function: mosquitto_socks5_set
+ *
+ * Configure the client to use a SOCKS5 proxy when connecting. Must be called
+ * before connecting. "None" and "username/password" authentication is
+ * supported.
+ *
+ * Parameters:
+ *   mosq - a valid mosquitto instance.
+ *   host - the SOCKS5 proxy host to connect to.
+ *   port - the SOCKS5 proxy port to use.
+ *   username - if not NULL, use this username when authenticating with the proxy.
+ *   password - if not NULL and username is not NULL, use this password when
+ *              authenticating with the proxy.
+ */
+libmosq_EXPORT int mosquitto_socks5_set(struct mosquitto *mosq, const char *host, int port, const char *username, const char *password);
+
+
+/* =============================================================================
+ *
+ * Section: Utility functions
+ *
+ * =============================================================================
+ */
+
+/*
+ * Function: mosquitto_strerror
+ *
+ * Call to obtain a const string description of a mosquitto error number.
+ *
+ * Parameters:
+ *	mosq_errno - a mosquitto error number.
+ *
+ * Returns:
+ *	A constant string describing the error.
+ */
+libmosq_EXPORT const char *mosquitto_strerror(int mosq_errno);
+
+/*
+ * Function: mosquitto_connack_string
+ *
+ * Call to obtain a const string description of an MQTT connection result.
+ *
+ * Parameters:
+ *	connack_code - an MQTT connection result.
+ *
+ * Returns:
+ *	A constant string describing the result.
+ */
+libmosq_EXPORT const char *mosquitto_connack_string(int connack_code);
+
+/*
+ * Function: mosquitto_reason_string
+ *
+ * Call to obtain a const string description of an MQTT reason code.
+ *
+ * Parameters:
+ *	reason_code - an MQTT reason code.
+ *
+ * Returns:
+ *	A constant string describing the reason.
+ */
+libmosq_EXPORT const char *mosquitto_reason_string(int reason_code);
+
+/* Function: mosquitto_string_to_command
+ *
+ * Take a string input representing an MQTT command and convert it to the
+ * libmosquitto integer representation.
+ *
+ * Parameters:
+ *   str - the string to parse.
+ *   cmd - pointer to an int, for the result.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success
+ *	MOSQ_ERR_INVAL - on an invalid input.
+ *
+ * Example:
+ *  mosquitto_string_to_command("CONNECT", &cmd);
+ *  // cmd == CMD_CONNECT
+ */
+libmosq_EXPORT int mosquitto_string_to_command(const char *str, int *cmd);
+
+/*
+ * Function: mosquitto_sub_topic_tokenise
+ *
+ * Tokenise a topic or subscription string into an array of strings
+ * representing the topic hierarchy.
+ *
+ * For example:
+ *
+ * subtopic: "a/deep/topic/hierarchy"
+ *
+ * Would result in:
+ *
+ * topics[0] = "a"
+ * topics[1] = "deep"
+ * topics[2] = "topic"
+ * topics[3] = "hierarchy"
+ *
+ * and:
+ *
+ * subtopic: "/a/deep/topic/hierarchy/"
+ *
+ * Would result in:
+ *
+ * topics[0] = NULL
+ * topics[1] = "a"
+ * topics[2] = "deep"
+ * topics[3] = "topic"
+ * topics[4] = "hierarchy"
+ *
+ * Parameters:
+ *	subtopic - the subscription/topic to tokenise
+ *	topics -   a pointer to store the array of strings
+ *	count -    an int pointer to store the number of items in the topics array.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS -        on success
+ * 	MOSQ_ERR_NOMEM -          if an out of memory condition occurred.
+ * 	MOSQ_ERR_MALFORMED_UTF8 - if the topic is not valid UTF-8
+ *
+ * Example:
+ *
+ * > char **topics;
+ * > int topic_count;
+ * > int i;
+ * >
+ * > mosquitto_sub_topic_tokenise("$SYS/broker/uptime", &topics, &topic_count);
+ * >
+ * > for(i=0; i<token_count; i++){
+ * >     printf("%d: %s\n", i, topics[i]);
+ * > }
+ *
+ * See Also:
+ *	<mosquitto_sub_topic_tokens_free>
+ */
+libmosq_EXPORT int mosquitto_sub_topic_tokenise(const char *subtopic, char ***topics, int *count);
+
+/*
+ * Function: mosquitto_sub_topic_tokens_free
+ *
+ * Free memory that was allocated in <mosquitto_sub_topic_tokenise>.
+ *
+ * Parameters:
+ *	topics - pointer to string array.
+ *	count - count of items in string array.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ *
+ * See Also:
+ *	<mosquitto_sub_topic_tokenise>
+ */
+libmosq_EXPORT int mosquitto_sub_topic_tokens_free(char ***topics, int count);
+
+/*
+ * Function: mosquitto_topic_matches_sub
+ * Function: mosquitto_topic_matches_sub2
+ *
+ * Check whether a topic matches a subscription.
+ *
+ * For example:
+ *
+ * foo/bar would match the subscription foo/# or +/bar
+ * non/matching would not match the subscription non/+/+
+ *
+ * Parameters:
+ *	sub - subscription string to check topic against.
+ *	sublen - length in bytes of sub string
+ *	topic - topic to check.
+ *	topiclen - length in bytes of topic string
+ *	result - bool pointer to hold result. Will be set to true if the topic
+ *	         matches the subscription.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success
+ * 	MOSQ_ERR_INVAL -   if the input parameters were invalid.
+ * 	MOSQ_ERR_NOMEM -   if an out of memory condition occurred.
+ */
+libmosq_EXPORT int mosquitto_topic_matches_sub(const char *sub, const char *topic, bool *result);
+libmosq_EXPORT int mosquitto_topic_matches_sub2(const char *sub, size_t sublen, const char *topic, size_t topiclen, bool *result);
+
+/*
+ * Function: mosquitto_pub_topic_check
+ *
+ * Check whether a topic to be used for publishing is valid.
+ *
+ * This searches for + or # in a topic and checks its length.
+ *
+ * This check is already carried out in <mosquitto_publish> and
+ * <mosquitto_will_set>, there is no need to call it directly before them. It
+ * may be useful if you wish to check the validity of a topic in advance of
+ * making a connection for example.
+ *
+ * Parameters:
+ *   topic - the topic to check
+ *   topiclen - length of the topic in bytes
+ *
+ * Returns:
+ *   MOSQ_ERR_SUCCESS -        for a valid topic
+ *   MOSQ_ERR_INVAL -          if the topic contains a + or a #, or if it is too long.
+ * 	 MOSQ_ERR_MALFORMED_UTF8 - if sub or topic is not valid UTF-8
+ *
+ * See Also:
+ *   <mosquitto_sub_topic_check>
+ */
+libmosq_EXPORT int mosquitto_pub_topic_check(const char *topic);
+libmosq_EXPORT int mosquitto_pub_topic_check2(const char *topic, size_t topiclen);
+
+/*
+ * Function: mosquitto_sub_topic_check
+ *
+ * Check whether a topic to be used for subscribing is valid.
+ *
+ * This searches for + or # in a topic and checks that they aren't in invalid
+ * positions, such as with foo/#/bar, foo/+bar or foo/bar#, and checks its
+ * length.
+ *
+ * This check is already carried out in <mosquitto_subscribe> and
+ * <mosquitto_unsubscribe>, there is no need to call it directly before them.
+ * It may be useful if you wish to check the validity of a topic in advance of
+ * making a connection for example.
+ *
+ * Parameters:
+ *   topic - the topic to check
+ *   topiclen - the length in bytes of the topic
+ *
+ * Returns:
+ *   MOSQ_ERR_SUCCESS -        for a valid topic
+ *   MOSQ_ERR_INVAL -          if the topic contains a + or a # that is in an
+ *                             invalid position, or if it is too long.
+ * 	 MOSQ_ERR_MALFORMED_UTF8 - if topic is not valid UTF-8
+ *
+ * See Also:
+ *   <mosquitto_sub_topic_check>
+ */
+libmosq_EXPORT int mosquitto_sub_topic_check(const char *topic);
+libmosq_EXPORT int mosquitto_sub_topic_check2(const char *topic, size_t topiclen);
+
+
+struct libmosquitto_will {
+	char *topic;
+	void *payload;
+	int payloadlen;
+	int qos;
+	bool retain;
+};
+
+struct libmosquitto_auth {
+	char *username;
+	char *password;
+};
+
+struct libmosquitto_tls {
+	char *cafile;
+	char *capath;
+	char *certfile;
+	char *keyfile;
+	char *ciphers;
+	char *tls_version;
+	int (*pw_callback)(char *buf, int size, int rwflag, void *userdata);
+	int cert_reqs;
+};
+
+/*
+ * Function: mosquitto_subscribe_simple
+ *
+ * Helper function to make subscribing to a topic and retrieving some messages
+ * very straightforward.
+ *
+ * This connects to a broker, subscribes to a topic, waits for msg_count
+ * messages to be received, then returns after disconnecting cleanly.
+ *
+ * Parameters:
+ *   messages - pointer to a "struct mosquitto_message *". The received
+ *              messages will be returned here. On error, this will be set to
+ *              NULL.
+ *   msg_count - the number of messages to retrieve.
+ *   want_retained - if set to true, stale retained messages will be treated as
+ *                   normal messages with regards to msg_count. If set to
+ *                   false, they will be ignored.
+ *   topic - the subscription topic to use (wildcards are allowed).
+ *   qos - the qos to use for the subscription.
+ *   host - the broker to connect to.
+ *   port - the network port the broker is listening on.
+ *   client_id - the client id to use, or NULL if a random client id should be
+ *               generated.
+ *   keepalive - the MQTT keepalive value.
+ *   clean_session - the MQTT clean session flag.
+ *   username - the username string, or NULL for no username authentication.
+ *   password - the password string, or NULL for an empty password.
+ *   will - a libmosquitto_will struct containing will information, or NULL for
+ *          no will.
+ *   tls - a libmosquitto_tls struct containing TLS related parameters, or NULL
+ *         for no use of TLS.
+ *
+ *
+ * Returns:
+ *   MOSQ_ERR_SUCCESS - on success
+ *   >0 - on error.
+ */
+libmosq_EXPORT int mosquitto_subscribe_simple(
+		struct mosquitto_message **messages,
+		int msg_count,
+		bool want_retained,
+		const char *topic,
+		int qos,
+		const char *host,
+		int port,
+		const char *client_id,
+		int keepalive,
+		bool clean_session,
+		const char *username,
+		const char *password,
+		const struct libmosquitto_will *will,
+		const struct libmosquitto_tls *tls);
+
+
+/*
+ * Function: mosquitto_subscribe_callback
+ *
+ * Helper function to make subscribing to a topic and processing some messages
+ * very straightforward.
+ *
+ * This connects to a broker, subscribes to a topic, then passes received
+ * messages to a user provided callback. If the callback returns a 1, it then
+ * disconnects cleanly and returns.
+ *
+ * Parameters:
+ *   callback - a callback function in the following form:
+ *              int callback(struct mosquitto *mosq, void *obj, const struct mosquitto_message *message)
+ *              Note that this is the same as the normal on_message callback,
+ *              except that it returns an int.
+ *   userdata - user provided pointer that will be passed to the callback.
+ *   topic - the subscription topic to use (wildcards are allowed).
+ *   qos - the qos to use for the subscription.
+ *   host - the broker to connect to.
+ *   port - the network port the broker is listening on.
+ *   client_id - the client id to use, or NULL if a random client id should be
+ *               generated.
+ *   keepalive - the MQTT keepalive value.
+ *   clean_session - the MQTT clean session flag.
+ *   username - the username string, or NULL for no username authentication.
+ *   password - the password string, or NULL for an empty password.
+ *   will - a libmosquitto_will struct containing will information, or NULL for
+ *          no will.
+ *   tls - a libmosquitto_tls struct containing TLS related parameters, or NULL
+ *         for no use of TLS.
+ *
+ *
+ * Returns:
+ *   MOSQ_ERR_SUCCESS - on success
+ *   >0 - on error.
+ */
+libmosq_EXPORT int mosquitto_subscribe_callback(
+		int (*callback)(struct mosquitto *, void *, const struct mosquitto_message *),
+		void *userdata,
+		const char *topic,
+		int qos,
+		const char *host,
+		int port,
+		const char *client_id,
+		int keepalive,
+		bool clean_session,
+		const char *username,
+		const char *password,
+		const struct libmosquitto_will *will,
+		const struct libmosquitto_tls *tls);
+
+
+/*
+ * Function: mosquitto_validate_utf8
+ *
+ * Helper function to validate whether a UTF-8 string is valid, according to
+ * the UTF-8 spec and the MQTT additions.
+ *
+ * Parameters:
+ *   str - a string to check
+ *   len - the length of the string in bytes
+ *
+ * Returns:
+ *   MOSQ_ERR_SUCCESS -        on success
+ *   MOSQ_ERR_INVAL -          if str is NULL or len<0 or len>65536
+ *   MOSQ_ERR_MALFORMED_UTF8 - if str is not valid UTF-8
+ */
+libmosq_EXPORT int mosquitto_validate_utf8(const char *str, int len);
+
+
+/* =============================================================================
+ *
+ * Section: Properties
+ *
+ * =============================================================================
+ */
+
+
+/*
+ * Function: mosquitto_property_add_byte
+ *
+ * Add a new byte property to a property list.
+ *
+ * If *proplist == NULL, a new list will be created, otherwise the new property
+ * will be appended to the list.
+ *
+ * Parameters:
+ *	proplist - pointer to mosquitto_property pointer, the list of properties
+ *	identifier - property identifier (e.g. MQTT_PROP_PAYLOAD_FORMAT_INDICATOR)
+ *	value - integer value for the new property
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success
+ *	MOSQ_ERR_INVAL - if identifier is invalid, or if proplist is NULL
+ *	MOSQ_ERR_NOMEM - on out of memory
+ *
+ * Example:
+ *	mosquitto_property *proplist = NULL;
+ *	mosquitto_property_add_byte(&proplist, MQTT_PROP_PAYLOAD_FORMAT_IDENTIFIER, 1);
+ */
+libmosq_EXPORT int mosquitto_property_add_byte(mosquitto_property **proplist, int identifier, uint8_t value);
+
+/*
+ * Function: mosquitto_property_add_int16
+ *
+ * Add a new int16 property to a property list.
+ *
+ * If *proplist == NULL, a new list will be created, otherwise the new property
+ * will be appended to the list.
+ *
+ * Parameters:
+ *	proplist - pointer to mosquitto_property pointer, the list of properties
+ *	identifier - property identifier (e.g. MQTT_PROP_RECEIVE_MAXIMUM)
+ *	value - integer value for the new property
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success
+ *	MOSQ_ERR_INVAL - if identifier is invalid, or if proplist is NULL
+ *	MOSQ_ERR_NOMEM - on out of memory
+ *
+ * Example:
+ *	mosquitto_property *proplist = NULL;
+ *	mosquitto_property_add_int16(&proplist, MQTT_PROP_RECEIVE_MAXIMUM, 1000);
+ */
+libmosq_EXPORT int mosquitto_property_add_int16(mosquitto_property **proplist, int identifier, uint16_t value);
+
+/*
+ * Function: mosquitto_property_add_int32
+ *
+ * Add a new int32 property to a property list.
+ *
+ * If *proplist == NULL, a new list will be created, otherwise the new property
+ * will be appended to the list.
+ *
+ * Parameters:
+ *	proplist - pointer to mosquitto_property pointer, the list of properties
+ *	identifier - property identifier (e.g. MQTT_PROP_MESSAGE_EXPIRY_INTERVAL)
+ *	value - integer value for the new property
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success
+ *	MOSQ_ERR_INVAL - if identifier is invalid, or if proplist is NULL
+ *	MOSQ_ERR_NOMEM - on out of memory
+ *
+ * Example:
+ *	mosquitto_property *proplist = NULL;
+ *	mosquitto_property_add_int32(&proplist, MQTT_PROP_MESSAGE_EXPIRY_INTERVAL, 86400);
+ */
+libmosq_EXPORT int mosquitto_property_add_int32(mosquitto_property **proplist, int identifier, uint32_t value);
+
+/*
+ * Function: mosquitto_property_add_varint
+ *
+ * Add a new varint property to a property list.
+ *
+ * If *proplist == NULL, a new list will be created, otherwise the new property
+ * will be appended to the list.
+ *
+ * Parameters:
+ *	proplist - pointer to mosquitto_property pointer, the list of properties
+ *	identifier - property identifier (e.g. MQTT_PROP_SUBSCRIPTION_IDENTIFIER)
+ *	value - integer value for the new property
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success
+ *	MOSQ_ERR_INVAL - if identifier is invalid, or if proplist is NULL
+ *	MOSQ_ERR_NOMEM - on out of memory
+ *
+ * Example:
+ *	mosquitto_property *proplist = NULL;
+ *	mosquitto_property_add_varint(&proplist, MQTT_PROP_SUBSCRIPTION_IDENTIFIER, 1);
+ */
+libmosq_EXPORT int mosquitto_property_add_varint(mosquitto_property **proplist, int identifier, uint32_t value);
+
+/*
+ * Function: mosquitto_property_add_binary
+ *
+ * Add a new binary property to a property list.
+ *
+ * If *proplist == NULL, a new list will be created, otherwise the new property
+ * will be appended to the list.
+ *
+ * Parameters:
+ *	proplist - pointer to mosquitto_property pointer, the list of properties
+ *	identifier - property identifier (e.g. MQTT_PROP_PAYLOAD_FORMAT_INDICATOR)
+ *	value - pointer to the property data
+ *	len - length of property data in bytes
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success
+ *	MOSQ_ERR_INVAL - if identifier is invalid, or if proplist is NULL
+ *	MOSQ_ERR_NOMEM - on out of memory
+ *
+ * Example:
+ *	mosquitto_property *proplist = NULL;
+ *	mosquitto_property_add_binary(&proplist, MQTT_PROP_AUTHENTICATION_DATA, auth_data, auth_data_len);
+ */
+libmosq_EXPORT int mosquitto_property_add_binary(mosquitto_property **proplist, int identifier, const void *value, uint16_t len);
+
+/*
+ * Function: mosquitto_property_add_string
+ *
+ * Add a new string property to a property list.
+ *
+ * If *proplist == NULL, a new list will be created, otherwise the new property
+ * will be appended to the list.
+ *
+ * Parameters:
+ *	proplist - pointer to mosquitto_property pointer, the list of properties
+ *	identifier - property identifier (e.g. MQTT_PROP_CONTENT_TYPE)
+ *	value - string value for the new property, must be UTF-8 and zero terminated
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success
+ *	MOSQ_ERR_INVAL - if identifier is invalid, if value is NULL, or if proplist is NULL
+ *	MOSQ_ERR_NOMEM - on out of memory
+ *	MOSQ_ERR_MALFORMED_UTF8 - value is not valid UTF-8.
+ *
+ * Example:
+ *	mosquitto_property *proplist = NULL;
+ *	mosquitto_property_add_string(&proplist, MQTT_PROP_CONTENT_TYPE, "application/json");
+ */
+libmosq_EXPORT int mosquitto_property_add_string(mosquitto_property **proplist, int identifier, const char *value);
+
+/*
+ * Function: mosquitto_property_add_string_pair
+ *
+ * Add a new string pair property to a property list.
+ *
+ * If *proplist == NULL, a new list will be created, otherwise the new property
+ * will be appended to the list.
+ *
+ * Parameters:
+ *	proplist - pointer to mosquitto_property pointer, the list of properties
+ *	identifier - property identifier (e.g. MQTT_PROP_USER_PROPERTY)
+ *	name - string name for the new property, must be UTF-8 and zero terminated
+ *	value - string value for the new property, must be UTF-8 and zero terminated
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success
+ *	MOSQ_ERR_INVAL - if identifier is invalid, if name or value is NULL, or if proplist is NULL
+ *	MOSQ_ERR_NOMEM - on out of memory
+ *	MOSQ_ERR_MALFORMED_UTF8 - if name or value are not valid UTF-8.
+ *
+ * Example:
+ *	mosquitto_property *proplist = NULL;
+ *	mosquitto_property_add_string_pair(&proplist, MQTT_PROP_USER_PROPERTY, "client", "mosquitto_pub");
+ */
+libmosq_EXPORT int mosquitto_property_add_string_pair(mosquitto_property **proplist, int identifier, const char *name, const char *value);
+
+/*
+ * Function: mosquitto_property_read_byte
+ *
+ * Attempt to read a byte property matching an identifier, from a property list
+ * or single property. This function can search for multiple entries of the
+ * same identifier by using the returned value and skip_first. Note however
+ * that it is forbidden for most properties to be duplicated.
+ *
+ * If the property is not found, *value will not be modified, so it is safe to
+ * pass a variable with a default value to be potentially overwritten:
+ *
+ * uint16_t keepalive = 60; // default value
+ * // Get value from property list, or keep default if not found.
+ * mosquitto_property_read_int16(proplist, MQTT_PROP_SERVER_KEEP_ALIVE, &keepalive, false);
+ *
+ * Parameters:
+ *	proplist - mosquitto_property pointer, the list of properties or single property
+ *	identifier - property identifier (e.g. MQTT_PROP_PAYLOAD_FORMAT_INDICATOR)
+ *	value - pointer to store the value, or NULL if the value is not required.
+ *	skip_first - boolean that indicates whether the first item in the list
+ *	             should be ignored or not. Should usually be set to false.
+ *
+ * Returns:
+ *	A valid property pointer if the property is found
+ *	NULL, if the property is not found, or proplist is NULL.
+ *
+ * Example:
+ *	// proplist is obtained from a callback
+ *	mosquitto_property *prop;
+ *	prop = mosquitto_property_read_byte(proplist, identifier, &value, false);
+ *	while(prop){
+ *		printf("value: %s\n", value);
+ *		prop = mosquitto_property_read_byte(prop, identifier, &value);
+ *	}
+ */
+libmosq_EXPORT const mosquitto_property *mosquitto_property_read_byte(
+		const mosquitto_property *proplist,
+		int identifier,
+		uint8_t *value,
+		bool skip_first);
+
+/*
+ * Function: mosquitto_property_read_int16
+ *
+ * Read an int16 property value from a property.
+ *
+ * Parameters:
+ *	property - property to read
+ *	identifier - property identifier (e.g. MQTT_PROP_PAYLOAD_FORMAT_INDICATOR)
+ *	value - pointer to store the value, or NULL if the value is not required.
+ *	skip_first - boolean that indicates whether the first item in the list
+ *	             should be ignored or not. Should usually be set to false.
+ *
+ * Returns:
+ *	A valid property pointer if the property is found
+ *	NULL, if the property is not found, or proplist is NULL.
+ *
+ * Example:
+ *	See <mosquitto_property_read_byte>
+ */
+libmosq_EXPORT const mosquitto_property *mosquitto_property_read_int16(
+		const mosquitto_property *proplist,
+		int identifier,
+		uint16_t *value,
+		bool skip_first);
+
+/*
+ * Function: mosquitto_property_read_int32
+ *
+ * Read an int32 property value from a property.
+ *
+ * Parameters:
+ *	property - pointer to mosquitto_property pointer, the list of properties
+ *	identifier - property identifier (e.g. MQTT_PROP_PAYLOAD_FORMAT_INDICATOR)
+ *	value - pointer to store the value, or NULL if the value is not required.
+ *	skip_first - boolean that indicates whether the first item in the list
+ *	             should be ignored or not. Should usually be set to false.
+ *
+ * Returns:
+ *	A valid property pointer if the property is found
+ *	NULL, if the property is not found, or proplist is NULL.
+ *
+ * Example:
+ *	See <mosquitto_property_read_byte>
+ */
+libmosq_EXPORT const mosquitto_property *mosquitto_property_read_int32(
+		const mosquitto_property *proplist,
+		int identifier,
+		uint32_t *value,
+		bool skip_first);
+
+/*
+ * Function: mosquitto_property_read_varint
+ *
+ * Read a varint property value from a property.
+ *
+ * Parameters:
+ *	property - property to read
+ *	identifier - property identifier (e.g. MQTT_PROP_PAYLOAD_FORMAT_INDICATOR)
+ *	value - pointer to store the value, or NULL if the value is not required.
+ *	skip_first - boolean that indicates whether the first item in the list
+ *	             should be ignored or not. Should usually be set to false.
+ *
+ * Returns:
+ *	A valid property pointer if the property is found
+ *	NULL, if the property is not found, or proplist is NULL.
+ *
+ * Example:
+ *	See <mosquitto_property_read_byte>
+ */
+libmosq_EXPORT const mosquitto_property *mosquitto_property_read_varint(
+		const mosquitto_property *proplist,
+		int identifier,
+		uint32_t *value,
+		bool skip_first);
+
+/*
+ * Function: mosquitto_property_read_binary
+ *
+ * Read a binary property value from a property.
+ *
+ * On success, value must be free()'d by the application.
+ *
+ * Parameters:
+ *	property - property to read
+ *	identifier - property identifier (e.g. MQTT_PROP_PAYLOAD_FORMAT_INDICATOR)
+ *	value - pointer to store the value, or NULL if the value is not required.
+ *	skip_first - boolean that indicates whether the first item in the list
+ *	             should be ignored or not. Should usually be set to false.
+ *
+ * Returns:
+ *	A valid property pointer if the property is found
+ *	NULL, if the property is not found, or proplist is NULL, or if an out of memory condition occurred.
+ *
+ * Example:
+ *	See <mosquitto_property_read_byte>
+ */
+libmosq_EXPORT const mosquitto_property *mosquitto_property_read_binary(
+		const mosquitto_property *proplist,
+		int identifier,
+		void **value,
+		uint16_t *len,
+		bool skip_first);
+
+/*
+ * Function: mosquitto_property_read_string
+ *
+ * Read a string property value from a property.
+ *
+ * On success, value must be free()'d by the application.
+ *
+ * Parameters:
+ *	property - property to read
+ *	identifier - property identifier (e.g. MQTT_PROP_PAYLOAD_FORMAT_INDICATOR)
+ *	value - pointer to char*, for the property data to be stored in, or NULL if
+ *	        the value is not required.
+ *	skip_first - boolean that indicates whether the first item in the list
+ *	             should be ignored or not. Should usually be set to false.
+ *
+ * Returns:
+ *	A valid property pointer if the property is found
+ *	NULL, if the property is not found, or proplist is NULL, or if an out of memory condition occurred.
+ *
+ * Example:
+ *	See <mosquitto_property_read_byte>
+ */
+libmosq_EXPORT const mosquitto_property *mosquitto_property_read_string(
+		const mosquitto_property *proplist,
+		int identifier,
+		char **value,
+		bool skip_first);
+
+/*
+ * Function: mosquitto_property_read_string_pair
+ *
+ * Read a string pair property value pair from a property.
+ *
+ * On success, name and value must be free()'d by the application.
+ *
+ * Parameters:
+ *	property - property to read
+ *	identifier - property identifier (e.g. MQTT_PROP_PAYLOAD_FORMAT_INDICATOR)
+ *	name - pointer to char* for the name property data to be stored in, or NULL
+ *	       if the name is not required.
+ *	value - pointer to char*, for the property data to be stored in, or NULL if
+ *	        the value is not required.
+ *	skip_first - boolean that indicates whether the first item in the list
+ *	             should be ignored or not. Should usually be set to false.
+ *
+ * Returns:
+ *	A valid property pointer if the property is found
+ *	NULL, if the property is not found, or proplist is NULL, or if an out of memory condition occurred.
+ *
+ * Example:
+ *	See <mosquitto_property_read_byte>
+ */
+libmosq_EXPORT const mosquitto_property *mosquitto_property_read_string_pair(
+		const mosquitto_property *proplist,
+		int identifier,
+		char **name,
+		char **value,
+		bool skip_first);
+
+/*
+ * Function: mosquitto_property_free_all
+ *
+ * Free all properties from a list of properties. Frees the list and sets *properties to NULL.
+ *
+ * Parameters:
+ *   properties - list of properties to free
+ *
+ * Example:
+ *   mosquitto_properties *properties = NULL;
+ *   // Add properties
+ *   mosquitto_property_free_all(&properties);
+ */
+libmosq_EXPORT void mosquitto_property_free_all(mosquitto_property **properties);
+
+/*
+ * Function: mosquitto_property_copy_all
+ *
+ * Parameters:
+ *    dest : pointer for new property list
+ *    src : property list
+ *
+ * Returns:
+ *    MOSQ_ERR_SUCCESS - on successful copy
+ *    MOSQ_ERR_INVAL - if dest is NULL
+ *    MOSQ_ERR_NOMEM - on out of memory (dest will be set to NULL)
+ */
+libmosq_EXPORT int mosquitto_property_copy_all(mosquitto_property **dest, const mosquitto_property *src);
+
+/*
+ * Function: mosquitto_property_check_command
+ *
+ * Check whether a property identifier is valid for the given command.
+ *
+ * Parameters:
+ *   command - MQTT command (e.g. CMD_CONNECT)
+ *   identifier - MQTT property (e.g. MQTT_PROP_USER_PROPERTY)
+ *
+ * Returns:
+ *   MOSQ_ERR_SUCCESS - if the identifier is valid for command
+ *   MOSQ_ERR_PROTOCOL - if the identifier is not valid for use with command.
+ */
+libmosq_EXPORT int mosquitto_property_check_command(int command, int identifier);
+
+
+/*
+ * Function: mosquitto_property_check_all
+ *
+ * Check whether a list of properties are valid for a particular command,
+ * whether there are duplicates, and whether the values are valid where
+ * possible.
+ *
+ * Note that this function is used internally in the library whenever
+ * properties are passed to it, so in basic use this is not needed, but should
+ * be helpful to check property lists *before* the point of using them.
+ *
+ * Parameters:
+ *	command - MQTT command (e.g. CMD_CONNECT)
+ *	properties - list of MQTT properties to check.
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - if all properties are valid
+ *	MOSQ_ERR_DUPLICATE_PROPERTY - if a property is duplicated where it is forbidden.
+ *	MOSQ_ERR_PROTOCOL - if any property is invalid
+ */
+libmosq_EXPORT int mosquitto_property_check_all(int command, const mosquitto_property *properties);
+
+/* Function: mosquitto_string_to_property_info
+ *
+ * Parse a property name string and convert to a property identifier and data type.
+ * The property name is as defined in the MQTT specification, with - as a
+ * separator, for example: payload-format-indicator.
+ *
+ * Parameters:
+ *	propname - the string to parse
+ *	identifier - pointer to an int to receive the property identifier
+ *	type - pointer to an int to receive the property type
+ *
+ * Returns:
+ *	MOSQ_ERR_SUCCESS - on success
+ *	MOSQ_ERR_INVAL - if the string does not match a property
+ *
+ * Example:
+ *	mosquitto_string_to_property_info("response-topic", &id, &type);
+ *	// id == MQTT_PROP_RESPONSE_TOPIC
+ *	// type == MQTT_PROP_TYPE_STRING
+ */
+libmosq_EXPORT int mosquitto_string_to_property_info(const char *propname, int *identifier, int *type);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/libs/libmosquitto/include/uthash.h b/libs/libmosquitto/include/uthash.h
new file mode 100644
index 0000000000..915a8254ee
--- /dev/null
+++ b/libs/libmosquitto/include/uthash.h
@@ -0,0 +1,948 @@
+/*
+Copyright (c) 2003-2013, Troy D. Hanson     http://troydhanson.github.com/uthash/
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef UTHASH_H
+#define UTHASH_H 
+
+#include <string.h>   /* memcmp,strlen */
+#include <stddef.h>   /* ptrdiff_t */
+#include <stdlib.h>   /* exit() */
+
+/* These macros use decltype or the earlier __typeof GNU extension.
+   As decltype is only available in newer compilers (VS2010 or gcc 4.3+
+   when compiling c++ source) this code uses whatever method is needed
+   or, for VS2008 where neither is available, uses casting workarounds. */
+#ifdef _MSC_VER         /* MS compiler */
+#if _MSC_VER >= 1600 && defined(__cplusplus)  /* VS2010 or newer in C++ mode */
+#define DECLTYPE(x) (decltype(x))
+#else                   /* VS2008 or older (or VS2010 in C mode) */
+#define NO_DECLTYPE
+#define DECLTYPE(x)
+#endif
+#else                   /* GNU, Sun and other compilers */
+#define DECLTYPE(x) (__typeof(x))
+#endif
+
+#ifdef NO_DECLTYPE
+#define DECLTYPE_ASSIGN(dst,src)                                                 \
+do {                                                                             \
+  char **_da_dst = (char**)(&(dst));                                             \
+  *_da_dst = (char*)(src);                                                       \
+} while(0)
+#else 
+#define DECLTYPE_ASSIGN(dst,src)                                                 \
+do {                                                                             \
+  (dst) = DECLTYPE(dst)(src);                                                    \
+} while(0)
+#endif
+
+/* a number of the hash function use uint32_t which isn't defined on win32 */
+#ifdef _MSC_VER
+typedef unsigned int uint32_t;
+typedef unsigned char uint8_t;
+#else
+#include <inttypes.h>   /* uint32_t */
+#endif
+
+#define UTHASH_VERSION 1.9.8
+
+#ifndef uthash_fatal
+#define uthash_fatal(msg) exit(-1)        /* fatal error (out of memory,etc) */
+#endif
+#ifndef uthash_malloc
+#define uthash_malloc(sz) malloc(sz)      /* malloc fcn                      */
+#endif
+#ifndef uthash_free
+#define uthash_free(ptr,sz) free(ptr)     /* free fcn                        */
+#endif
+
+#ifndef uthash_noexpand_fyi
+#define uthash_noexpand_fyi(tbl)          /* can be defined to log noexpand  */
+#endif
+#ifndef uthash_expand_fyi
+#define uthash_expand_fyi(tbl)            /* can be defined to log expands   */
+#endif
+
+/* initial number of buckets */
+#define HASH_INITIAL_NUM_BUCKETS 32      /* initial number of buckets        */
+#define HASH_INITIAL_NUM_BUCKETS_LOG2 5  /* lg2 of initial number of buckets */
+#define HASH_BKT_CAPACITY_THRESH 10      /* expand when bucket count reaches */
+
+/* calculate the element whose hash handle address is hhe */
+#define ELMT_FROM_HH(tbl,hhp) ((void*)(((char*)(hhp)) - ((tbl)->hho)))
+
+#define HASH_FIND(hh,head,keyptr,keylen,out)                                     \
+do {                                                                             \
+  unsigned _hf_bkt,_hf_hashv;                                                    \
+  out=NULL;                                                                      \
+  if (head) {                                                                    \
+     HASH_FCN(keyptr,keylen, (head)->hh.tbl->num_buckets, _hf_hashv, _hf_bkt);   \
+     if (HASH_BLOOM_TEST((head)->hh.tbl, _hf_hashv)) {                           \
+       HASH_FIND_IN_BKT((head)->hh.tbl, hh, (head)->hh.tbl->buckets[ _hf_bkt ],  \
+                        keyptr,keylen,out);                                      \
+     }                                                                           \
+  }                                                                              \
+} while (0)
+
+#ifdef HASH_BLOOM
+#define HASH_BLOOM_BITLEN (1ULL << HASH_BLOOM)
+#define HASH_BLOOM_BYTELEN (HASH_BLOOM_BITLEN/8) + ((HASH_BLOOM_BITLEN%8) ? 1:0)
+#define HASH_BLOOM_MAKE(tbl)                                                     \
+do {                                                                             \
+  (tbl)->bloom_nbits = HASH_BLOOM;                                               \
+  (tbl)->bloom_bv = (uint8_t*)uthash_malloc(HASH_BLOOM_BYTELEN);                 \
+  if (!((tbl)->bloom_bv))  { uthash_fatal( "out of memory"); }                   \
+  memset((tbl)->bloom_bv, 0, HASH_BLOOM_BYTELEN);                                \
+  (tbl)->bloom_sig = HASH_BLOOM_SIGNATURE;                                       \
+} while (0) 
+
+#define HASH_BLOOM_FREE(tbl)                                                     \
+do {                                                                             \
+  uthash_free((tbl)->bloom_bv, HASH_BLOOM_BYTELEN);                              \
+} while (0) 
+
+#define HASH_BLOOM_BITSET(bv,idx) (bv[(idx)/8] |= (1U << ((idx)%8)))
+#define HASH_BLOOM_BITTEST(bv,idx) (bv[(idx)/8] & (1U << ((idx)%8)))
+
+#define HASH_BLOOM_ADD(tbl,hashv)                                                \
+  HASH_BLOOM_BITSET((tbl)->bloom_bv, (hashv & (uint32_t)((1ULL << (tbl)->bloom_nbits) - 1)))
+
+#define HASH_BLOOM_TEST(tbl,hashv)                                               \
+  HASH_BLOOM_BITTEST((tbl)->bloom_bv, (hashv & (uint32_t)((1ULL << (tbl)->bloom_nbits) - 1)))
+
+#else
+#define HASH_BLOOM_MAKE(tbl) 
+#define HASH_BLOOM_FREE(tbl) 
+#define HASH_BLOOM_ADD(tbl,hashv) 
+#define HASH_BLOOM_TEST(tbl,hashv) (1)
+#define HASH_BLOOM_BYTELEN 0
+#endif
+
+#define HASH_MAKE_TABLE(hh,head)                                                 \
+do {                                                                             \
+  (head)->hh.tbl = (UT_hash_table*)uthash_malloc(                                \
+                  sizeof(UT_hash_table));                                        \
+  if (!((head)->hh.tbl))  { uthash_fatal( "out of memory"); }                    \
+  memset((head)->hh.tbl, 0, sizeof(UT_hash_table));                              \
+  (head)->hh.tbl->tail = &((head)->hh);                                          \
+  (head)->hh.tbl->num_buckets = HASH_INITIAL_NUM_BUCKETS;                        \
+  (head)->hh.tbl->log2_num_buckets = HASH_INITIAL_NUM_BUCKETS_LOG2;              \
+  (head)->hh.tbl->hho = (char*)(&(head)->hh) - (char*)(head);                    \
+  (head)->hh.tbl->buckets = (UT_hash_bucket*)uthash_malloc(                      \
+          HASH_INITIAL_NUM_BUCKETS*sizeof(struct UT_hash_bucket));               \
+  if (! (head)->hh.tbl->buckets) { uthash_fatal( "out of memory"); }             \
+  memset((head)->hh.tbl->buckets, 0,                                             \
+          HASH_INITIAL_NUM_BUCKETS*sizeof(struct UT_hash_bucket));               \
+  HASH_BLOOM_MAKE((head)->hh.tbl);                                               \
+  (head)->hh.tbl->signature = HASH_SIGNATURE;                                    \
+} while(0)
+
+#define HASH_ADD(hh,head,fieldname,keylen_in,add)                                \
+        HASH_ADD_KEYPTR(hh,head,&((add)->fieldname),keylen_in,add)
+
+#define HASH_REPLACE(hh,head,fieldname,keylen_in,add,replaced)                   \
+do {                                                                             \
+  replaced=NULL;                                                                 \
+  HASH_FIND(hh,head,&((add)->fieldname),keylen_in,replaced);                     \
+  if (replaced!=NULL) {                                                          \
+     HASH_DELETE(hh,head,replaced);                                              \
+  };                                                                             \
+  HASH_ADD(hh,head,fieldname,keylen_in,add);                                     \
+} while(0)
+ 
+#define HASH_ADD_KEYPTR(hh,head,keyptr,keylen_in,add)                            \
+do {                                                                             \
+ unsigned _ha_bkt;                                                               \
+ (add)->hh.next = NULL;                                                          \
+ (add)->hh.key = (char*)keyptr;                                                  \
+ (add)->hh.keylen = (unsigned)keylen_in;                                                   \
+ if (!(head)) {                                                                  \
+    head = (add);                                                                \
+    (head)->hh.prev = NULL;                                                      \
+    HASH_MAKE_TABLE(hh,head);                                                    \
+ } else {                                                                        \
+    (head)->hh.tbl->tail->next = (add);                                          \
+    (add)->hh.prev = ELMT_FROM_HH((head)->hh.tbl, (head)->hh.tbl->tail);         \
+    (head)->hh.tbl->tail = &((add)->hh);                                         \
+ }                                                                               \
+ (head)->hh.tbl->num_items++;                                                    \
+ (add)->hh.tbl = (head)->hh.tbl;                                                 \
+ HASH_FCN(keyptr,keylen_in, (head)->hh.tbl->num_buckets,                         \
+         (add)->hh.hashv, _ha_bkt);                                              \
+ HASH_ADD_TO_BKT((head)->hh.tbl->buckets[_ha_bkt],&(add)->hh);                   \
+ HASH_BLOOM_ADD((head)->hh.tbl,(add)->hh.hashv);                                 \
+ HASH_EMIT_KEY(hh,head,keyptr,keylen_in);                                        \
+ HASH_FSCK(hh,head);                                                             \
+} while(0)
+
+#define HASH_TO_BKT( hashv, num_bkts, bkt )                                      \
+do {                                                                             \
+  bkt = ((hashv) & ((num_bkts) - 1));                                            \
+} while(0)
+
+/* delete "delptr" from the hash table.
+ * "the usual" patch-up process for the app-order doubly-linked-list.
+ * The use of _hd_hh_del below deserves special explanation.
+ * These used to be expressed using (delptr) but that led to a bug
+ * if someone used the same symbol for the head and deletee, like
+ *  HASH_DELETE(hh,users,users);
+ * We want that to work, but by changing the head (users) below
+ * we were forfeiting our ability to further refer to the deletee (users)
+ * in the patch-up process. Solution: use scratch space to
+ * copy the deletee pointer, then the latter references are via that
+ * scratch pointer rather than through the repointed (users) symbol.
+ */
+#define HASH_DELETE(hh,head,delptr)                                              \
+do {                                                                             \
+    unsigned _hd_bkt;                                                            \
+    struct UT_hash_handle *_hd_hh_del;                                           \
+    if ( ((delptr)->hh.prev == NULL) && ((delptr)->hh.next == NULL) )  {         \
+        uthash_free((head)->hh.tbl->buckets,                                     \
+                    (head)->hh.tbl->num_buckets*sizeof(struct UT_hash_bucket) ); \
+        HASH_BLOOM_FREE((head)->hh.tbl);                                         \
+        uthash_free((head)->hh.tbl, sizeof(UT_hash_table));                      \
+        head = NULL;                                                             \
+    } else {                                                                     \
+        _hd_hh_del = &((delptr)->hh);                                            \
+        if ((delptr) == ELMT_FROM_HH((head)->hh.tbl,(head)->hh.tbl->tail)) {     \
+            (head)->hh.tbl->tail =                                               \
+                (UT_hash_handle*)((ptrdiff_t)((delptr)->hh.prev) +               \
+                (head)->hh.tbl->hho);                                            \
+        }                                                                        \
+        if ((delptr)->hh.prev) {                                                 \
+            ((UT_hash_handle*)((ptrdiff_t)((delptr)->hh.prev) +                  \
+                    (head)->hh.tbl->hho))->next = (delptr)->hh.next;             \
+        } else {                                                                 \
+            DECLTYPE_ASSIGN(head,(delptr)->hh.next);                             \
+        }                                                                        \
+        if (_hd_hh_del->next) {                                                  \
+            ((UT_hash_handle*)((ptrdiff_t)_hd_hh_del->next +                     \
+                    (head)->hh.tbl->hho))->prev =                                \
+                    _hd_hh_del->prev;                                            \
+        }                                                                        \
+        HASH_TO_BKT( _hd_hh_del->hashv, (head)->hh.tbl->num_buckets, _hd_bkt);   \
+        HASH_DEL_IN_BKT(hh,(head)->hh.tbl->buckets[_hd_bkt], _hd_hh_del);        \
+        (head)->hh.tbl->num_items--;                                             \
+    }                                                                            \
+    HASH_FSCK(hh,head);                                                          \
+} while (0)
+
+
+/* convenience forms of HASH_FIND/HASH_ADD/HASH_DEL */
+#define HASH_FIND_STR(head,findstr,out)                                          \
+    HASH_FIND(hh,head,findstr,strlen(findstr),out)
+#define HASH_ADD_STR(head,strfield,add)                                          \
+    HASH_ADD(hh,head,strfield,strlen(add->strfield),add)
+#define HASH_REPLACE_STR(head,strfield,add,replaced)                             \
+  HASH_REPLACE(hh,head,strfield,strlen(add->strfield),add,replaced)
+#define HASH_FIND_INT(head,findint,out)                                          \
+    HASH_FIND(hh,head,findint,sizeof(int),out)
+#define HASH_ADD_INT(head,intfield,add)                                          \
+    HASH_ADD(hh,head,intfield,sizeof(int),add)
+#define HASH_REPLACE_INT(head,intfield,add,replaced)                             \
+    HASH_REPLACE(hh,head,intfield,sizeof(int),add,replaced)
+#define HASH_FIND_PTR(head,findptr,out)                                          \
+    HASH_FIND(hh,head,findptr,sizeof(void *),out)
+#define HASH_ADD_PTR(head,ptrfield,add)                                          \
+    HASH_ADD(hh,head,ptrfield,sizeof(void *),add)
+#define HASH_REPLACE_PTR(head,ptrfield,add)                                      \
+    HASH_REPLACE(hh,head,ptrfield,sizeof(void *),add,replaced)
+#define HASH_DEL(head,delptr)                                                    \
+    HASH_DELETE(hh,head,delptr)
+
+/* HASH_FSCK checks hash integrity on every add/delete when HASH_DEBUG is defined.
+ * This is for uthash developer only; it compiles away if HASH_DEBUG isn't defined.
+ */
+#ifdef HASH_DEBUG
+#define HASH_OOPS(...) do { fprintf(stderr,__VA_ARGS__); exit(-1); } while (0)
+#define HASH_FSCK(hh,head)                                                       \
+do {                                                                             \
+    unsigned _bkt_i;                                                             \
+    unsigned _count, _bkt_count;                                                 \
+    char *_prev;                                                                 \
+    struct UT_hash_handle *_thh;                                                 \
+    if (head) {                                                                  \
+        _count = 0;                                                              \
+        for( _bkt_i = 0; _bkt_i < (head)->hh.tbl->num_buckets; _bkt_i++) {       \
+            _bkt_count = 0;                                                      \
+            _thh = (head)->hh.tbl->buckets[_bkt_i].hh_head;                      \
+            _prev = NULL;                                                        \
+            while (_thh) {                                                       \
+               if (_prev != (char*)(_thh->hh_prev)) {                            \
+                   HASH_OOPS("invalid hh_prev %p, actual %p\n",                  \
+                    _thh->hh_prev, _prev );                                      \
+               }                                                                 \
+               _bkt_count++;                                                     \
+               _prev = (char*)(_thh);                                            \
+               _thh = _thh->hh_next;                                             \
+            }                                                                    \
+            _count += _bkt_count;                                                \
+            if ((head)->hh.tbl->buckets[_bkt_i].count !=  _bkt_count) {          \
+               HASH_OOPS("invalid bucket count %d, actual %d\n",                 \
+                (head)->hh.tbl->buckets[_bkt_i].count, _bkt_count);              \
+            }                                                                    \
+        }                                                                        \
+        if (_count != (head)->hh.tbl->num_items) {                               \
+            HASH_OOPS("invalid hh item count %d, actual %d\n",                   \
+                (head)->hh.tbl->num_items, _count );                             \
+        }                                                                        \
+        /* traverse hh in app order; check next/prev integrity, count */         \
+        _count = 0;                                                              \
+        _prev = NULL;                                                            \
+        _thh =  &(head)->hh;                                                     \
+        while (_thh) {                                                           \
+           _count++;                                                             \
+           if (_prev !=(char*)(_thh->prev)) {                                    \
+              HASH_OOPS("invalid prev %p, actual %p\n",                          \
+                    _thh->prev, _prev );                                         \
+           }                                                                     \
+           _prev = (char*)ELMT_FROM_HH((head)->hh.tbl, _thh);                    \
+           _thh = ( _thh->next ?  (UT_hash_handle*)((char*)(_thh->next) +        \
+                                  (head)->hh.tbl->hho) : NULL );                 \
+        }                                                                        \
+        if (_count != (head)->hh.tbl->num_items) {                               \
+            HASH_OOPS("invalid app item count %d, actual %d\n",                  \
+                (head)->hh.tbl->num_items, _count );                             \
+        }                                                                        \
+    }                                                                            \
+} while (0)
+#else
+#define HASH_FSCK(hh,head) 
+#endif
+
+/* When compiled with -DHASH_EMIT_KEYS, length-prefixed keys are emitted to 
+ * the descriptor to which this macro is defined for tuning the hash function.
+ * The app can #include <unistd.h> to get the prototype for write(2). */
+#ifdef HASH_EMIT_KEYS
+#define HASH_EMIT_KEY(hh,head,keyptr,fieldlen)                                   \
+do {                                                                             \
+    unsigned _klen = fieldlen;                                                   \
+    write(HASH_EMIT_KEYS, &_klen, sizeof(_klen));                                \
+    write(HASH_EMIT_KEYS, keyptr, fieldlen);                                     \
+} while (0)
+#else 
+#define HASH_EMIT_KEY(hh,head,keyptr,fieldlen)                    
+#endif
+
+/* default to Jenkin's hash unless overridden e.g. DHASH_FUNCTION=HASH_SAX */
+#ifdef HASH_FUNCTION 
+#define HASH_FCN HASH_FUNCTION
+#else
+#define HASH_FCN HASH_JEN
+#endif
+
+/* The Bernstein hash function, used in Perl prior to v5.6 */
+#define HASH_BER(key,keylen,num_bkts,hashv,bkt)                                  \
+do {                                                                             \
+  unsigned _hb_keylen=keylen;                                                    \
+  char *_hb_key=(char*)(key);                                                    \
+  (hashv) = 0;                                                                   \
+  while (_hb_keylen--)  { (hashv) = ((hashv) * 33) + *_hb_key++; }               \
+  bkt = (hashv) & (num_bkts-1);                                                  \
+} while (0)
+
+
+/* SAX/FNV/OAT/JEN hash functions are macro variants of those listed at 
+ * http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx */
+#define HASH_SAX(key,keylen,num_bkts,hashv,bkt)                                  \
+do {                                                                             \
+  unsigned _sx_i;                                                                \
+  char *_hs_key=(char*)(key);                                                    \
+  hashv = 0;                                                                     \
+  for(_sx_i=0; _sx_i < keylen; _sx_i++)                                          \
+      hashv ^= (hashv << 5) + (hashv >> 2) + _hs_key[_sx_i];                     \
+  bkt = hashv & (num_bkts-1);                                                    \
+} while (0)
+
+#define HASH_FNV(key,keylen,num_bkts,hashv,bkt)                                  \
+do {                                                                             \
+  unsigned _fn_i;                                                                \
+  char *_hf_key=(char*)(key);                                                    \
+  hashv = 2166136261UL;                                                          \
+  for(_fn_i=0; _fn_i < keylen; _fn_i++)                                          \
+      hashv = (hashv * 16777619) ^ _hf_key[_fn_i];                               \
+  bkt = hashv & (num_bkts-1);                                                    \
+} while(0) 
+ 
+#define HASH_OAT(key,keylen,num_bkts,hashv,bkt)                                  \
+do {                                                                             \
+  unsigned _ho_i;                                                                \
+  char *_ho_key=(char*)(key);                                                    \
+  hashv = 0;                                                                     \
+  for(_ho_i=0; _ho_i < keylen; _ho_i++) {                                        \
+      hashv += _ho_key[_ho_i];                                                   \
+      hashv += (hashv << 10);                                                    \
+      hashv ^= (hashv >> 6);                                                     \
+  }                                                                              \
+  hashv += (hashv << 3);                                                         \
+  hashv ^= (hashv >> 11);                                                        \
+  hashv += (hashv << 15);                                                        \
+  bkt = hashv & (num_bkts-1);                                                    \
+} while(0)
+
+#define HASH_JEN_MIX(a,b,c)                                                      \
+do {                                                                             \
+  a -= b; a -= c; a ^= ( c >> 13 );                                              \
+  b -= c; b -= a; b ^= ( a << 8 );                                               \
+  c -= a; c -= b; c ^= ( b >> 13 );                                              \
+  a -= b; a -= c; a ^= ( c >> 12 );                                              \
+  b -= c; b -= a; b ^= ( a << 16 );                                              \
+  c -= a; c -= b; c ^= ( b >> 5 );                                               \
+  a -= b; a -= c; a ^= ( c >> 3 );                                               \
+  b -= c; b -= a; b ^= ( a << 10 );                                              \
+  c -= a; c -= b; c ^= ( b >> 15 );                                              \
+} while (0)
+
+#define HASH_JEN(key,keylen,num_bkts,hashv,bkt)                                  \
+do {                                                                             \
+  unsigned _hj_i,_hj_j,_hj_k;                                                    \
+  unsigned char *_hj_key=(unsigned char*)(key);                                  \
+  hashv = 0xfeedbeef;                                                            \
+  _hj_i = _hj_j = 0x9e3779b9;                                                    \
+  _hj_k = (unsigned)keylen;                                                      \
+  while (_hj_k >= 12) {                                                          \
+    _hj_i +=    (_hj_key[0] + ( (unsigned)_hj_key[1] << 8 )                      \
+        + ( (unsigned)_hj_key[2] << 16 )                                         \
+        + ( (unsigned)_hj_key[3] << 24 ) );                                      \
+    _hj_j +=    (_hj_key[4] + ( (unsigned)_hj_key[5] << 8 )                      \
+        + ( (unsigned)_hj_key[6] << 16 )                                         \
+        + ( (unsigned)_hj_key[7] << 24 ) );                                      \
+    hashv += (_hj_key[8] + ( (unsigned)_hj_key[9] << 8 )                         \
+        + ( (unsigned)_hj_key[10] << 16 )                                        \
+        + ( (unsigned)_hj_key[11] << 24 ) );                                     \
+                                                                                 \
+     HASH_JEN_MIX(_hj_i, _hj_j, hashv);                                          \
+                                                                                 \
+     _hj_key += 12;                                                              \
+     _hj_k -= 12;                                                                \
+  }                                                                              \
+  hashv += keylen;                                                               \
+  switch ( _hj_k ) {                                                             \
+     case 11: hashv += ( (unsigned)_hj_key[10] << 24 );                          \
+     case 10: hashv += ( (unsigned)_hj_key[9] << 16 );                           \
+     case 9:  hashv += ( (unsigned)_hj_key[8] << 8 );                            \
+     case 8:  _hj_j += ( (unsigned)_hj_key[7] << 24 );                           \
+     case 7:  _hj_j += ( (unsigned)_hj_key[6] << 16 );                           \
+     case 6:  _hj_j += ( (unsigned)_hj_key[5] << 8 );                            \
+     case 5:  _hj_j += _hj_key[4];                                               \
+     case 4:  _hj_i += ( (unsigned)_hj_key[3] << 24 );                           \
+     case 3:  _hj_i += ( (unsigned)_hj_key[2] << 16 );                           \
+     case 2:  _hj_i += ( (unsigned)_hj_key[1] << 8 );                            \
+     case 1:  _hj_i += _hj_key[0];                                               \
+  }                                                                              \
+  HASH_JEN_MIX(_hj_i, _hj_j, hashv);                                             \
+  bkt = hashv & (num_bkts-1);                                                    \
+} while(0)
+
+/* The Paul Hsieh hash function */
+#undef get16bits
+#if (defined(__GNUC__) && defined(__i386__)) || defined(__WATCOMC__)             \
+  || defined(_MSC_VER) || defined (__BORLANDC__) || defined (__TURBOC__)
+#define get16bits(d) (*((const uint16_t *) (d)))
+#endif
+
+#if !defined (get16bits)
+#define get16bits(d) ((((uint32_t)(((const uint8_t *)(d))[1])) << 8)             \
+                       +(uint32_t)(((const uint8_t *)(d))[0]) )
+#endif
+#define HASH_SFH(key,keylen,num_bkts,hashv,bkt)                                  \
+do {                                                                             \
+  unsigned char *_sfh_key=(unsigned char*)(key);                                 \
+  uint32_t _sfh_tmp, _sfh_len = keylen;                                          \
+                                                                                 \
+  int _sfh_rem = _sfh_len & 3;                                                   \
+  _sfh_len >>= 2;                                                                \
+  hashv = 0xcafebabe;                                                            \
+                                                                                 \
+  /* Main loop */                                                                \
+  for (;_sfh_len > 0; _sfh_len--) {                                              \
+    hashv    += get16bits (_sfh_key);                                            \
+    _sfh_tmp       = (uint32_t)(get16bits (_sfh_key+2)) << 11  ^ hashv;          \
+    hashv     = (hashv << 16) ^ _sfh_tmp;                                        \
+    _sfh_key += 2*sizeof (uint16_t);                                             \
+    hashv    += hashv >> 11;                                                     \
+  }                                                                              \
+                                                                                 \
+  /* Handle end cases */                                                         \
+  switch (_sfh_rem) {                                                            \
+    case 3: hashv += get16bits (_sfh_key);                                       \
+            hashv ^= hashv << 16;                                                \
+            hashv ^= (uint32_t)(_sfh_key[sizeof (uint16_t)] << 18);              \
+            hashv += hashv >> 11;                                                \
+            break;                                                               \
+    case 2: hashv += get16bits (_sfh_key);                                       \
+            hashv ^= hashv << 11;                                                \
+            hashv += hashv >> 17;                                                \
+            break;                                                               \
+    case 1: hashv += *_sfh_key;                                                  \
+            hashv ^= hashv << 10;                                                \
+            hashv += hashv >> 1;                                                 \
+  }                                                                              \
+                                                                                 \
+    /* Force "avalanching" of final 127 bits */                                  \
+    hashv ^= hashv << 3;                                                         \
+    hashv += hashv >> 5;                                                         \
+    hashv ^= hashv << 4;                                                         \
+    hashv += hashv >> 17;                                                        \
+    hashv ^= hashv << 25;                                                        \
+    hashv += hashv >> 6;                                                         \
+    bkt = hashv & (num_bkts-1);                                                  \
+} while(0) 
+
+#ifdef HASH_USING_NO_STRICT_ALIASING
+/* The MurmurHash exploits some CPU's (x86,x86_64) tolerance for unaligned reads.
+ * For other types of CPU's (e.g. Sparc) an unaligned read causes a bus error.
+ * MurmurHash uses the faster approach only on CPU's where we know it's safe. 
+ *
+ * Note the preprocessor built-in defines can be emitted using:
+ *
+ *   gcc -m64 -dM -E - < /dev/null                  (on gcc)
+ *   cc -## a.c (where a.c is a simple test file)   (Sun Studio)
+ */
+#if (defined(__i386__) || defined(__x86_64__)  || defined(_M_IX86))
+#define MUR_GETBLOCK(p,i) p[i]
+#else /* non intel */
+#define MUR_PLUS0_ALIGNED(p) (((unsigned long)p & 0x3) == 0)
+#define MUR_PLUS1_ALIGNED(p) (((unsigned long)p & 0x3) == 1)
+#define MUR_PLUS2_ALIGNED(p) (((unsigned long)p & 0x3) == 2)
+#define MUR_PLUS3_ALIGNED(p) (((unsigned long)p & 0x3) == 3)
+#define WP(p) ((uint32_t*)((unsigned long)(p) & ~3UL))
+#if (defined(__BIG_ENDIAN__) || defined(SPARC) || defined(__ppc__) || defined(__ppc64__))
+#define MUR_THREE_ONE(p) ((((*WP(p))&0x00ffffff) << 8) | (((*(WP(p)+1))&0xff000000) >> 24))
+#define MUR_TWO_TWO(p)   ((((*WP(p))&0x0000ffff) <<16) | (((*(WP(p)+1))&0xffff0000) >> 16))
+#define MUR_ONE_THREE(p) ((((*WP(p))&0x000000ff) <<24) | (((*(WP(p)+1))&0xffffff00) >>  8))
+#else /* assume little endian non-intel */
+#define MUR_THREE_ONE(p) ((((*WP(p))&0xffffff00) >> 8) | (((*(WP(p)+1))&0x000000ff) << 24))
+#define MUR_TWO_TWO(p)   ((((*WP(p))&0xffff0000) >>16) | (((*(WP(p)+1))&0x0000ffff) << 16))
+#define MUR_ONE_THREE(p) ((((*WP(p))&0xff000000) >>24) | (((*(WP(p)+1))&0x00ffffff) <<  8))
+#endif
+#define MUR_GETBLOCK(p,i) (MUR_PLUS0_ALIGNED(p) ? ((p)[i]) :           \
+                            (MUR_PLUS1_ALIGNED(p) ? MUR_THREE_ONE(p) : \
+                             (MUR_PLUS2_ALIGNED(p) ? MUR_TWO_TWO(p) :  \
+                                                      MUR_ONE_THREE(p))))
+#endif
+#define MUR_ROTL32(x,r) (((x) << (r)) | ((x) >> (32 - (r))))
+#define MUR_FMIX(_h) \
+do {                 \
+  _h ^= _h >> 16;    \
+  _h *= 0x85ebca6b;  \
+  _h ^= _h >> 13;    \
+  _h *= 0xc2b2ae35l; \
+  _h ^= _h >> 16;    \
+} while(0)
+
+#define HASH_MUR(key,keylen,num_bkts,hashv,bkt)                        \
+do {                                                                   \
+  const uint8_t *_mur_data = (const uint8_t*)(key);                    \
+  const int _mur_nblocks = (keylen) / 4;                               \
+  uint32_t _mur_h1 = 0xf88D5353;                                       \
+  uint32_t _mur_c1 = 0xcc9e2d51;                                       \
+  uint32_t _mur_c2 = 0x1b873593;                                       \
+  uint32_t _mur_k1 = 0;                                                \
+  const uint8_t *_mur_tail;                                            \
+  const uint32_t *_mur_blocks = (const uint32_t*)(_mur_data+_mur_nblocks*4); \
+  int _mur_i;                                                          \
+  for(_mur_i = -_mur_nblocks; _mur_i; _mur_i++) {                      \
+    _mur_k1 = MUR_GETBLOCK(_mur_blocks,_mur_i);                        \
+    _mur_k1 *= _mur_c1;                                                \
+    _mur_k1 = MUR_ROTL32(_mur_k1,15);                                  \
+    _mur_k1 *= _mur_c2;                                                \
+                                                                       \
+    _mur_h1 ^= _mur_k1;                                                \
+    _mur_h1 = MUR_ROTL32(_mur_h1,13);                                  \
+    _mur_h1 = _mur_h1*5+0xe6546b64;                                    \
+  }                                                                    \
+  _mur_tail = (const uint8_t*)(_mur_data + _mur_nblocks*4);            \
+  _mur_k1=0;                                                           \
+  switch((keylen) & 3) {                                               \
+    case 3: _mur_k1 ^= _mur_tail[2] << 16;                             \
+    case 2: _mur_k1 ^= _mur_tail[1] << 8;                              \
+    case 1: _mur_k1 ^= _mur_tail[0];                                   \
+    _mur_k1 *= _mur_c1;                                                \
+    _mur_k1 = MUR_ROTL32(_mur_k1,15);                                  \
+    _mur_k1 *= _mur_c2;                                                \
+    _mur_h1 ^= _mur_k1;                                                \
+  }                                                                    \
+  _mur_h1 ^= (keylen);                                                 \
+  MUR_FMIX(_mur_h1);                                                   \
+  hashv = _mur_h1;                                                     \
+  bkt = hashv & (num_bkts-1);                                          \
+} while(0)
+#endif  /* HASH_USING_NO_STRICT_ALIASING */
+
+/* key comparison function; return 0 if keys equal */
+#define HASH_KEYCMP(a,b,len) memcmp(a,b,len) 
+
+/* iterate over items in a known bucket to find desired item */
+#define HASH_FIND_IN_BKT(tbl,hh,head,keyptr,keylen_in,out)                       \
+do {                                                                             \
+ if (head.hh_head) DECLTYPE_ASSIGN(out,ELMT_FROM_HH(tbl,head.hh_head));          \
+ else out=NULL;                                                                  \
+ while (out) {                                                                   \
+    if ((out)->hh.keylen == keylen_in) {                                           \
+        if ((HASH_KEYCMP((out)->hh.key,keyptr,keylen_in)) == 0) break;             \
+    }                                                                            \
+    if ((out)->hh.hh_next) DECLTYPE_ASSIGN(out,ELMT_FROM_HH(tbl,(out)->hh.hh_next)); \
+    else out = NULL;                                                             \
+ }                                                                               \
+} while(0)
+
+/* add an item to a bucket  */
+#define HASH_ADD_TO_BKT(head,addhh)                                              \
+do {                                                                             \
+ head.count++;                                                                   \
+ (addhh)->hh_next = head.hh_head;                                                \
+ (addhh)->hh_prev = NULL;                                                        \
+ if (head.hh_head) { (head).hh_head->hh_prev = (addhh); }                        \
+ (head).hh_head=addhh;                                                           \
+ if (head.count >= ((head.expand_mult+1) * HASH_BKT_CAPACITY_THRESH)             \
+     && (addhh)->tbl->noexpand != 1) {                                           \
+       HASH_EXPAND_BUCKETS((addhh)->tbl);                                        \
+ }                                                                               \
+} while(0)
+
+/* remove an item from a given bucket */
+#define HASH_DEL_IN_BKT(hh,head,hh_del)                                          \
+    (head).count--;                                                              \
+    if ((head).hh_head == hh_del) {                                              \
+      (head).hh_head = hh_del->hh_next;                                          \
+    }                                                                            \
+    if (hh_del->hh_prev) {                                                       \
+        hh_del->hh_prev->hh_next = hh_del->hh_next;                              \
+    }                                                                            \
+    if (hh_del->hh_next) {                                                       \
+        hh_del->hh_next->hh_prev = hh_del->hh_prev;                              \
+    }                                                                
+
+/* Bucket expansion has the effect of doubling the number of buckets
+ * and redistributing the items into the new buckets. Ideally the
+ * items will distribute more or less evenly into the new buckets
+ * (the extent to which this is true is a measure of the quality of
+ * the hash function as it applies to the key domain). 
+ * 
+ * With the items distributed into more buckets, the chain length
+ * (item count) in each bucket is reduced. Thus by expanding buckets
+ * the hash keeps a bound on the chain length. This bounded chain 
+ * length is the essence of how a hash provides constant time lookup.
+ * 
+ * The calculation of tbl->ideal_chain_maxlen below deserves some
+ * explanation. First, keep in mind that we're calculating the ideal
+ * maximum chain length based on the *new* (doubled) bucket count.
+ * In fractions this is just n/b (n=number of items,b=new num buckets).
+ * Since the ideal chain length is an integer, we want to calculate 
+ * ceil(n/b). We don't depend on floating point arithmetic in this
+ * hash, so to calculate ceil(n/b) with integers we could write
+ * 
+ *      ceil(n/b) = (n/b) + ((n%b)?1:0)
+ * 
+ * and in fact a previous version of this hash did just that.
+ * But now we have improved things a bit by recognizing that b is
+ * always a power of two. We keep its base 2 log handy (call it lb),
+ * so now we can write this with a bit shift and logical AND:
+ * 
+ *      ceil(n/b) = (n>>lb) + ( (n & (b-1)) ? 1:0)
+ * 
+ */
+#define HASH_EXPAND_BUCKETS(tbl)                                                 \
+do {                                                                             \
+    unsigned _he_bkt;                                                            \
+    unsigned _he_bkt_i;                                                          \
+    struct UT_hash_handle *_he_thh, *_he_hh_nxt;                                 \
+    UT_hash_bucket *_he_new_buckets, *_he_newbkt;                                \
+    _he_new_buckets = (UT_hash_bucket*)uthash_malloc(                            \
+             2 * tbl->num_buckets * sizeof(struct UT_hash_bucket));              \
+    if (!_he_new_buckets) { uthash_fatal( "out of memory"); }                    \
+    memset(_he_new_buckets, 0,                                                   \
+            2 * tbl->num_buckets * sizeof(struct UT_hash_bucket));               \
+    tbl->ideal_chain_maxlen =                                                    \
+       (tbl->num_items >> (tbl->log2_num_buckets+1)) +                           \
+       ((tbl->num_items & ((tbl->num_buckets*2)-1)) ? 1 : 0);                    \
+    tbl->nonideal_items = 0;                                                     \
+    for(_he_bkt_i = 0; _he_bkt_i < tbl->num_buckets; _he_bkt_i++)                \
+    {                                                                            \
+        _he_thh = tbl->buckets[ _he_bkt_i ].hh_head;                             \
+        while (_he_thh) {                                                        \
+           _he_hh_nxt = _he_thh->hh_next;                                        \
+           HASH_TO_BKT( _he_thh->hashv, tbl->num_buckets*2, _he_bkt);            \
+           _he_newbkt = &(_he_new_buckets[ _he_bkt ]);                           \
+           if (++(_he_newbkt->count) > tbl->ideal_chain_maxlen) {                \
+             tbl->nonideal_items++;                                              \
+             _he_newbkt->expand_mult = _he_newbkt->count /                       \
+                                        tbl->ideal_chain_maxlen;                 \
+           }                                                                     \
+           _he_thh->hh_prev = NULL;                                              \
+           _he_thh->hh_next = _he_newbkt->hh_head;                               \
+           if (_he_newbkt->hh_head) _he_newbkt->hh_head->hh_prev =               \
+                _he_thh;                                                         \
+           _he_newbkt->hh_head = _he_thh;                                        \
+           _he_thh = _he_hh_nxt;                                                 \
+        }                                                                        \
+    }                                                                            \
+    uthash_free( tbl->buckets, tbl->num_buckets*sizeof(struct UT_hash_bucket) ); \
+    tbl->num_buckets *= 2;                                                       \
+    tbl->log2_num_buckets++;                                                     \
+    tbl->buckets = _he_new_buckets;                                              \
+    tbl->ineff_expands = (tbl->nonideal_items > (tbl->num_items >> 1)) ?         \
+        (tbl->ineff_expands+1) : 0;                                              \
+    if (tbl->ineff_expands > 1) {                                                \
+        tbl->noexpand=1;                                                         \
+        uthash_noexpand_fyi(tbl);                                                \
+    }                                                                            \
+    uthash_expand_fyi(tbl);                                                      \
+} while(0)
+
+
+/* This is an adaptation of Simon Tatham's O(n log(n)) mergesort */
+/* Note that HASH_SORT assumes the hash handle name to be hh. 
+ * HASH_SRT was added to allow the hash handle name to be passed in. */
+#define HASH_SORT(head,cmpfcn) HASH_SRT(hh,head,cmpfcn)
+#define HASH_SRT(hh,head,cmpfcn)                                                 \
+do {                                                                             \
+  unsigned _hs_i;                                                                \
+  unsigned _hs_looping,_hs_nmerges,_hs_insize,_hs_psize,_hs_qsize;               \
+  struct UT_hash_handle *_hs_p, *_hs_q, *_hs_e, *_hs_list, *_hs_tail;            \
+  if (head) {                                                                    \
+      _hs_insize = 1;                                                            \
+      _hs_looping = 1;                                                           \
+      _hs_list = &((head)->hh);                                                  \
+      while (_hs_looping) {                                                      \
+          _hs_p = _hs_list;                                                      \
+          _hs_list = NULL;                                                       \
+          _hs_tail = NULL;                                                       \
+          _hs_nmerges = 0;                                                       \
+          while (_hs_p) {                                                        \
+              _hs_nmerges++;                                                     \
+              _hs_q = _hs_p;                                                     \
+              _hs_psize = 0;                                                     \
+              for ( _hs_i = 0; _hs_i  < _hs_insize; _hs_i++ ) {                  \
+                  _hs_psize++;                                                   \
+                  _hs_q = (UT_hash_handle*)((_hs_q->next) ?                      \
+                          ((void*)((char*)(_hs_q->next) +                        \
+                          (head)->hh.tbl->hho)) : NULL);                         \
+                  if (! (_hs_q) ) break;                                         \
+              }                                                                  \
+              _hs_qsize = _hs_insize;                                            \
+              while ((_hs_psize > 0) || ((_hs_qsize > 0) && _hs_q )) {           \
+                  if (_hs_psize == 0) {                                          \
+                      _hs_e = _hs_q;                                             \
+                      _hs_q = (UT_hash_handle*)((_hs_q->next) ?                  \
+                              ((void*)((char*)(_hs_q->next) +                    \
+                              (head)->hh.tbl->hho)) : NULL);                     \
+                      _hs_qsize--;                                               \
+                  } else if ( (_hs_qsize == 0) || !(_hs_q) ) {                   \
+                      _hs_e = _hs_p;                                             \
+                      if (_hs_p){                                                \
+                        _hs_p = (UT_hash_handle*)((_hs_p->next) ?                \
+                                ((void*)((char*)(_hs_p->next) +                  \
+                                (head)->hh.tbl->hho)) : NULL);                   \
+                       }                                                         \
+                      _hs_psize--;                                               \
+                  } else if ((                                                   \
+                      cmpfcn(DECLTYPE(head)(ELMT_FROM_HH((head)->hh.tbl,_hs_p)), \
+                             DECLTYPE(head)(ELMT_FROM_HH((head)->hh.tbl,_hs_q))) \
+                             ) <= 0) {                                           \
+                      _hs_e = _hs_p;                                             \
+                      if (_hs_p){                                                \
+                        _hs_p = (UT_hash_handle*)((_hs_p->next) ?                \
+                               ((void*)((char*)(_hs_p->next) +                   \
+                               (head)->hh.tbl->hho)) : NULL);                    \
+                       }                                                         \
+                      _hs_psize--;                                               \
+                  } else {                                                       \
+                      _hs_e = _hs_q;                                             \
+                      _hs_q = (UT_hash_handle*)((_hs_q->next) ?                  \
+                              ((void*)((char*)(_hs_q->next) +                    \
+                              (head)->hh.tbl->hho)) : NULL);                     \
+                      _hs_qsize--;                                               \
+                  }                                                              \
+                  if ( _hs_tail ) {                                              \
+                      _hs_tail->next = ((_hs_e) ?                                \
+                            ELMT_FROM_HH((head)->hh.tbl,_hs_e) : NULL);          \
+                  } else {                                                       \
+                      _hs_list = _hs_e;                                          \
+                  }                                                              \
+                  if (_hs_e) {                                                   \
+                  _hs_e->prev = ((_hs_tail) ?                                    \
+                     ELMT_FROM_HH((head)->hh.tbl,_hs_tail) : NULL);              \
+                  }                                                              \
+                  _hs_tail = _hs_e;                                              \
+              }                                                                  \
+              _hs_p = _hs_q;                                                     \
+          }                                                                      \
+          if (_hs_tail){                                                         \
+            _hs_tail->next = NULL;                                               \
+          }                                                                      \
+          if ( _hs_nmerges <= 1 ) {                                              \
+              _hs_looping=0;                                                     \
+              (head)->hh.tbl->tail = _hs_tail;                                   \
+              DECLTYPE_ASSIGN(head,ELMT_FROM_HH((head)->hh.tbl, _hs_list));      \
+          }                                                                      \
+          _hs_insize *= 2;                                                       \
+      }                                                                          \
+      HASH_FSCK(hh,head);                                                        \
+ }                                                                               \
+} while (0)
+
+/* This function selects items from one hash into another hash. 
+ * The end result is that the selected items have dual presence 
+ * in both hashes. There is no copy of the items made; rather 
+ * they are added into the new hash through a secondary hash 
+ * hash handle that must be present in the structure. */
+#define HASH_SELECT(hh_dst, dst, hh_src, src, cond)                              \
+do {                                                                             \
+  unsigned _src_bkt, _dst_bkt;                                                   \
+  void *_last_elt=NULL, *_elt;                                                   \
+  UT_hash_handle *_src_hh, *_dst_hh, *_last_elt_hh=NULL;                         \
+  ptrdiff_t _dst_hho = ((char*)(&(dst)->hh_dst) - (char*)(dst));                 \
+  if (src) {                                                                     \
+    for(_src_bkt=0; _src_bkt < (src)->hh_src.tbl->num_buckets; _src_bkt++) {     \
+      for(_src_hh = (src)->hh_src.tbl->buckets[_src_bkt].hh_head;                \
+          _src_hh;                                                               \
+          _src_hh = _src_hh->hh_next) {                                          \
+          _elt = ELMT_FROM_HH((src)->hh_src.tbl, _src_hh);                       \
+          if (cond(_elt)) {                                                      \
+            _dst_hh = (UT_hash_handle*)(((char*)_elt) + _dst_hho);               \
+            _dst_hh->key = _src_hh->key;                                         \
+            _dst_hh->keylen = _src_hh->keylen;                                   \
+            _dst_hh->hashv = _src_hh->hashv;                                     \
+            _dst_hh->prev = _last_elt;                                           \
+            _dst_hh->next = NULL;                                                \
+            if (_last_elt_hh) { _last_elt_hh->next = _elt; }                     \
+            if (!dst) {                                                          \
+              DECLTYPE_ASSIGN(dst,_elt);                                         \
+              HASH_MAKE_TABLE(hh_dst,dst);                                       \
+            } else {                                                             \
+              _dst_hh->tbl = (dst)->hh_dst.tbl;                                  \
+            }                                                                    \
+            HASH_TO_BKT(_dst_hh->hashv, _dst_hh->tbl->num_buckets, _dst_bkt);    \
+            HASH_ADD_TO_BKT(_dst_hh->tbl->buckets[_dst_bkt],_dst_hh);            \
+            (dst)->hh_dst.tbl->num_items++;                                      \
+            _last_elt = _elt;                                                    \
+            _last_elt_hh = _dst_hh;                                              \
+          }                                                                      \
+      }                                                                          \
+    }                                                                            \
+  }                                                                              \
+  HASH_FSCK(hh_dst,dst);                                                         \
+} while (0)
+
+#define HASH_CLEAR(hh,head)                                                      \
+do {                                                                             \
+  if (head) {                                                                    \
+    uthash_free((head)->hh.tbl->buckets,                                         \
+                (head)->hh.tbl->num_buckets*sizeof(struct UT_hash_bucket));      \
+    HASH_BLOOM_FREE((head)->hh.tbl);                                             \
+    uthash_free((head)->hh.tbl, sizeof(UT_hash_table));                          \
+    (head)=NULL;                                                                 \
+  }                                                                              \
+} while(0)
+
+#define HASH_OVERHEAD(hh,head)                                                   \
+ (size_t)((((head)->hh.tbl->num_items   * sizeof(UT_hash_handle))   +            \
+           ((head)->hh.tbl->num_buckets * sizeof(UT_hash_bucket))   +            \
+            (sizeof(UT_hash_table))                                 +            \
+            (HASH_BLOOM_BYTELEN)))
+
+#ifdef NO_DECLTYPE
+#define HASH_ITER(hh,head,el,tmp)                                                \
+for((el)=(head), (*(char**)(&(tmp)))=(char*)((head)?(head)->hh.next:NULL);       \
+  el; (el)=(tmp),(*(char**)(&(tmp)))=(char*)((tmp)?(tmp)->hh.next:NULL)) 
+#else
+#define HASH_ITER(hh,head,el,tmp)                                                \
+for((el)=(head),(tmp)=DECLTYPE(el)((head)?(head)->hh.next:NULL);                 \
+  el; (el)=(tmp),(tmp)=DECLTYPE(el)((tmp)?(tmp)->hh.next:NULL))
+#endif
+
+/* obtain a count of items in the hash */
+#define HASH_COUNT(head) HASH_CNT(hh,head) 
+#define HASH_CNT(hh,head) ((head)?((head)->hh.tbl->num_items):0)
+
+typedef struct UT_hash_bucket {
+   struct UT_hash_handle *hh_head;
+   unsigned count;
+
+   /* expand_mult is normally set to 0. In this situation, the max chain length
+    * threshold is enforced at its default value, HASH_BKT_CAPACITY_THRESH. (If
+    * the bucket's chain exceeds this length, bucket expansion is triggered). 
+    * However, setting expand_mult to a non-zero value delays bucket expansion
+    * (that would be triggered by additions to this particular bucket)
+    * until its chain length reaches a *multiple* of HASH_BKT_CAPACITY_THRESH.
+    * (The multiplier is simply expand_mult+1). The whole idea of this
+    * multiplier is to reduce bucket expansions, since they are expensive, in
+    * situations where we know that a particular bucket tends to be overused.
+    * It is better to let its chain length grow to a longer yet-still-bounded
+    * value, than to do an O(n) bucket expansion too often. 
+    */
+   unsigned expand_mult;
+
+} UT_hash_bucket;
+
+/* random signature used only to find hash tables in external analysis */
+#define HASH_SIGNATURE 0xa0111fe1
+#define HASH_BLOOM_SIGNATURE 0xb12220f2
+
+typedef struct UT_hash_table {
+   UT_hash_bucket *buckets;
+   unsigned num_buckets, log2_num_buckets;
+   unsigned num_items;
+   struct UT_hash_handle *tail; /* tail hh in app order, for fast append    */
+   ptrdiff_t hho; /* hash handle offset (byte pos of hash handle in element */
+
+   /* in an ideal situation (all buckets used equally), no bucket would have
+    * more than ceil(#items/#buckets) items. that's the ideal chain length. */
+   unsigned ideal_chain_maxlen;
+
+   /* nonideal_items is the number of items in the hash whose chain position
+    * exceeds the ideal chain maxlen. these items pay the penalty for an uneven
+    * hash distribution; reaching them in a chain traversal takes >ideal steps */
+   unsigned nonideal_items;
+
+   /* ineffective expands occur when a bucket doubling was performed, but 
+    * afterward, more than half the items in the hash had nonideal chain
+    * positions. If this happens on two consecutive expansions we inhibit any
+    * further expansion, as it's not helping; this happens when the hash
+    * function isn't a good fit for the key domain. When expansion is inhibited
+    * the hash will still work, albeit no longer in constant time. */
+   unsigned ineff_expands, noexpand;
+
+   uint32_t signature; /* used only to find hash tables in external analysis */
+#ifdef HASH_BLOOM
+   uint32_t bloom_sig; /* used only to test bloom exists in external analysis */
+   uint8_t *bloom_bv;
+   char bloom_nbits;
+#endif
+
+} UT_hash_table;
+
+typedef struct UT_hash_handle {
+   struct UT_hash_table *tbl;
+   void *prev;                       /* prev element in app order      */
+   void *next;                       /* next element in app order      */
+   struct UT_hash_handle *hh_prev;   /* previous hh in bucket order    */
+   struct UT_hash_handle *hh_next;   /* next hh in bucket order        */
+   void *key;                        /* ptr to enclosing struct's key  */
+   unsigned keylen;                  /* enclosing struct's key len     */
+   unsigned hashv;                   /* result of hash-fcn(key)        */
+} UT_hash_handle;
+
+#endif /* UTHASH_H */
diff --git a/libs/libmosquitto/include/utlist.h b/libs/libmosquitto/include/utlist.h
new file mode 100644
index 0000000000..5bb1ac9b72
--- /dev/null
+++ b/libs/libmosquitto/include/utlist.h
@@ -0,0 +1,1073 @@
+/*
+Copyright (c) 2007-2018, Troy D. Hanson   http://troydhanson.github.com/uthash/
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef UTLIST_H
+#define UTLIST_H
+
+#define UTLIST_VERSION 2.1.0
+
+#include <assert.h>
+
+/*
+ * This file contains macros to manipulate singly and doubly-linked lists.
+ *
+ * 1. LL_ macros:  singly-linked lists.
+ * 2. DL_ macros:  doubly-linked lists.
+ * 3. CDL_ macros: circular doubly-linked lists.
+ *
+ * To use singly-linked lists, your structure must have a "next" pointer.
+ * To use doubly-linked lists, your structure must "prev" and "next" pointers.
+ * Either way, the pointer to the head of the list must be initialized to NULL.
+ *
+ * ----------------.EXAMPLE -------------------------
+ * struct item {
+ *      int id;
+ *      struct item *prev, *next;
+ * }
+ *
+ * struct item *list = NULL:
+ *
+ * int main() {
+ *      struct item *item;
+ *      ... allocate and populate item ...
+ *      DL_APPEND(list, item);
+ * }
+ * --------------------------------------------------
+ *
+ * For doubly-linked lists, the append and delete macros are O(1)
+ * For singly-linked lists, append and delete are O(n) but prepend is O(1)
+ * The sort macro is O(n log(n)) for all types of single/double/circular lists.
+ */
+
+/* These macros use decltype or the earlier __typeof GNU extension.
+   As decltype is only available in newer compilers (VS2010 or gcc 4.3+
+   when compiling c++ source) this code uses whatever method is needed
+   or, for VS2008 where neither is available, uses casting workarounds. */
+#if !defined(LDECLTYPE) && !defined(NO_DECLTYPE)
+#if defined(_MSC_VER)   /* MS compiler */
+#if _MSC_VER >= 1600 && defined(__cplusplus)  /* VS2010 or newer in C++ mode */
+#define LDECLTYPE(x) decltype(x)
+#else                   /* VS2008 or older (or VS2010 in C mode) */
+#define NO_DECLTYPE
+#endif
+#elif defined(__BORLANDC__) || defined(__ICCARM__) || defined(__LCC__) || defined(__WATCOMC__)
+#define NO_DECLTYPE
+#else                   /* GNU, Sun and other compilers */
+#define LDECLTYPE(x) __typeof(x)
+#endif
+#endif
+
+/* for VS2008 we use some workarounds to get around the lack of decltype,
+ * namely, we always reassign our tmp variable to the list head if we need
+ * to dereference its prev/next pointers, and save/restore the real head.*/
+#ifdef NO_DECLTYPE
+#define IF_NO_DECLTYPE(x) x
+#define LDECLTYPE(x) char*
+#define UTLIST_SV(elt,list) _tmp = (char*)(list); {char **_alias = (char**)&(list); *_alias = (elt); }
+#define UTLIST_NEXT(elt,list,next) ((char*)((list)->next))
+#define UTLIST_NEXTASGN(elt,list,to,next) { char **_alias = (char**)&((list)->next); *_alias=(char*)(to); }
+/* #define UTLIST_PREV(elt,list,prev) ((char*)((list)->prev)) */
+#define UTLIST_PREVASGN(elt,list,to,prev) { char **_alias = (char**)&((list)->prev); *_alias=(char*)(to); }
+#define UTLIST_RS(list) { char **_alias = (char**)&(list); *_alias=_tmp; }
+#define UTLIST_CASTASGN(a,b) { char **_alias = (char**)&(a); *_alias=(char*)(b); }
+#else
+#define IF_NO_DECLTYPE(x)
+#define UTLIST_SV(elt,list)
+#define UTLIST_NEXT(elt,list,next) ((elt)->next)
+#define UTLIST_NEXTASGN(elt,list,to,next) ((elt)->next)=(to)
+/* #define UTLIST_PREV(elt,list,prev) ((elt)->prev) */
+#define UTLIST_PREVASGN(elt,list,to,prev) ((elt)->prev)=(to)
+#define UTLIST_RS(list)
+#define UTLIST_CASTASGN(a,b) (a)=(b)
+#endif
+
+/******************************************************************************
+ * The sort macro is an adaptation of Simon Tatham's O(n log(n)) mergesort    *
+ * Unwieldy variable names used here to avoid shadowing passed-in variables.  *
+ *****************************************************************************/
+#define LL_SORT(list, cmp)                                                                     \
+    LL_SORT2(list, cmp, next)
+
+#define LL_SORT2(list, cmp, next)                                                              \
+do {                                                                                           \
+  LDECLTYPE(list) _ls_p;                                                                       \
+  LDECLTYPE(list) _ls_q;                                                                       \
+  LDECLTYPE(list) _ls_e;                                                                       \
+  LDECLTYPE(list) _ls_tail;                                                                    \
+  IF_NO_DECLTYPE(LDECLTYPE(list) _tmp;)                                                        \
+  int _ls_insize, _ls_nmerges, _ls_psize, _ls_qsize, _ls_i, _ls_looping;                       \
+  if (list) {                                                                                  \
+    _ls_insize = 1;                                                                            \
+    _ls_looping = 1;                                                                           \
+    while (_ls_looping) {                                                                      \
+      UTLIST_CASTASGN(_ls_p,list);                                                             \
+      (list) = NULL;                                                                           \
+      _ls_tail = NULL;                                                                         \
+      _ls_nmerges = 0;                                                                         \
+      while (_ls_p) {                                                                          \
+        _ls_nmerges++;                                                                         \
+        _ls_q = _ls_p;                                                                         \
+        _ls_psize = 0;                                                                         \
+        for (_ls_i = 0; _ls_i < _ls_insize; _ls_i++) {                                         \
+          _ls_psize++;                                                                         \
+          UTLIST_SV(_ls_q,list); _ls_q = UTLIST_NEXT(_ls_q,list,next); UTLIST_RS(list);        \
+          if (!_ls_q) break;                                                                   \
+        }                                                                                      \
+        _ls_qsize = _ls_insize;                                                                \
+        while (_ls_psize > 0 || (_ls_qsize > 0 && _ls_q)) {                                    \
+          if (_ls_psize == 0) {                                                                \
+            _ls_e = _ls_q; UTLIST_SV(_ls_q,list); _ls_q =                                      \
+              UTLIST_NEXT(_ls_q,list,next); UTLIST_RS(list); _ls_qsize--;                      \
+          } else if (_ls_qsize == 0 || !_ls_q) {                                               \
+            _ls_e = _ls_p; UTLIST_SV(_ls_p,list); _ls_p =                                      \
+              UTLIST_NEXT(_ls_p,list,next); UTLIST_RS(list); _ls_psize--;                      \
+          } else if (cmp(_ls_p,_ls_q) <= 0) {                                                  \
+            _ls_e = _ls_p; UTLIST_SV(_ls_p,list); _ls_p =                                      \
+              UTLIST_NEXT(_ls_p,list,next); UTLIST_RS(list); _ls_psize--;                      \
+          } else {                                                                             \
+            _ls_e = _ls_q; UTLIST_SV(_ls_q,list); _ls_q =                                      \
+              UTLIST_NEXT(_ls_q,list,next); UTLIST_RS(list); _ls_qsize--;                      \
+          }                                                                                    \
+          if (_ls_tail) {                                                                      \
+            UTLIST_SV(_ls_tail,list); UTLIST_NEXTASGN(_ls_tail,list,_ls_e,next); UTLIST_RS(list); \
+          } else {                                                                             \
+            UTLIST_CASTASGN(list,_ls_e);                                                       \
+          }                                                                                    \
+          _ls_tail = _ls_e;                                                                    \
+        }                                                                                      \
+        _ls_p = _ls_q;                                                                         \
+      }                                                                                        \
+      if (_ls_tail) {                                                                          \
+        UTLIST_SV(_ls_tail,list); UTLIST_NEXTASGN(_ls_tail,list,NULL,next); UTLIST_RS(list);   \
+      }                                                                                        \
+      if (_ls_nmerges <= 1) {                                                                  \
+        _ls_looping=0;                                                                         \
+      }                                                                                        \
+      _ls_insize *= 2;                                                                         \
+    }                                                                                          \
+  }                                                                                            \
+} while (0)
+
+
+#define DL_SORT(list, cmp)                                                                     \
+    DL_SORT2(list, cmp, prev, next)
+
+#define DL_SORT2(list, cmp, prev, next)                                                        \
+do {                                                                                           \
+  LDECLTYPE(list) _ls_p;                                                                       \
+  LDECLTYPE(list) _ls_q;                                                                       \
+  LDECLTYPE(list) _ls_e;                                                                       \
+  LDECLTYPE(list) _ls_tail;                                                                    \
+  IF_NO_DECLTYPE(LDECLTYPE(list) _tmp;)                                                        \
+  int _ls_insize, _ls_nmerges, _ls_psize, _ls_qsize, _ls_i, _ls_looping;                       \
+  if (list) {                                                                                  \
+    _ls_insize = 1;                                                                            \
+    _ls_looping = 1;                                                                           \
+    while (_ls_looping) {                                                                      \
+      UTLIST_CASTASGN(_ls_p,list);                                                             \
+      (list) = NULL;                                                                           \
+      _ls_tail = NULL;                                                                         \
+      _ls_nmerges = 0;                                                                         \
+      while (_ls_p) {                                                                          \
+        _ls_nmerges++;                                                                         \
+        _ls_q = _ls_p;                                                                         \
+        _ls_psize = 0;                                                                         \
+        for (_ls_i = 0; _ls_i < _ls_insize; _ls_i++) {                                         \
+          _ls_psize++;                                                                         \
+          UTLIST_SV(_ls_q,list); _ls_q = UTLIST_NEXT(_ls_q,list,next); UTLIST_RS(list);        \
+          if (!_ls_q) break;                                                                   \
+        }                                                                                      \
+        _ls_qsize = _ls_insize;                                                                \
+        while ((_ls_psize > 0) || ((_ls_qsize > 0) && _ls_q)) {                                \
+          if (_ls_psize == 0) {                                                                \
+            _ls_e = _ls_q; UTLIST_SV(_ls_q,list); _ls_q =                                      \
+              UTLIST_NEXT(_ls_q,list,next); UTLIST_RS(list); _ls_qsize--;                      \
+          } else if ((_ls_qsize == 0) || (!_ls_q)) {                                           \
+            _ls_e = _ls_p; UTLIST_SV(_ls_p,list); _ls_p =                                      \
+              UTLIST_NEXT(_ls_p,list,next); UTLIST_RS(list); _ls_psize--;                      \
+          } else if (cmp(_ls_p,_ls_q) <= 0) {                                                  \
+            _ls_e = _ls_p; UTLIST_SV(_ls_p,list); _ls_p =                                      \
+              UTLIST_NEXT(_ls_p,list,next); UTLIST_RS(list); _ls_psize--;                      \
+          } else {                                                                             \
+            _ls_e = _ls_q; UTLIST_SV(_ls_q,list); _ls_q =                                      \
+              UTLIST_NEXT(_ls_q,list,next); UTLIST_RS(list); _ls_qsize--;                      \
+          }                                                                                    \
+          if (_ls_tail) {                                                                      \
+            UTLIST_SV(_ls_tail,list); UTLIST_NEXTASGN(_ls_tail,list,_ls_e,next); UTLIST_RS(list); \
+          } else {                                                                             \
+            UTLIST_CASTASGN(list,_ls_e);                                                       \
+          }                                                                                    \
+          UTLIST_SV(_ls_e,list); UTLIST_PREVASGN(_ls_e,list,_ls_tail,prev); UTLIST_RS(list);   \
+          _ls_tail = _ls_e;                                                                    \
+        }                                                                                      \
+        _ls_p = _ls_q;                                                                         \
+      }                                                                                        \
+      UTLIST_CASTASGN((list)->prev, _ls_tail);                                                 \
+      UTLIST_SV(_ls_tail,list); UTLIST_NEXTASGN(_ls_tail,list,NULL,next); UTLIST_RS(list);     \
+      if (_ls_nmerges <= 1) {                                                                  \
+        _ls_looping=0;                                                                         \
+      }                                                                                        \
+      _ls_insize *= 2;                                                                         \
+    }                                                                                          \
+  }                                                                                            \
+} while (0)
+
+#define CDL_SORT(list, cmp)                                                                    \
+    CDL_SORT2(list, cmp, prev, next)
+
+#define CDL_SORT2(list, cmp, prev, next)                                                       \
+do {                                                                                           \
+  LDECLTYPE(list) _ls_p;                                                                       \
+  LDECLTYPE(list) _ls_q;                                                                       \
+  LDECLTYPE(list) _ls_e;                                                                       \
+  LDECLTYPE(list) _ls_tail;                                                                    \
+  LDECLTYPE(list) _ls_oldhead;                                                                 \
+  LDECLTYPE(list) _tmp;                                                                        \
+  int _ls_insize, _ls_nmerges, _ls_psize, _ls_qsize, _ls_i, _ls_looping;                       \
+  if (list) {                                                                                  \
+    _ls_insize = 1;                                                                            \
+    _ls_looping = 1;                                                                           \
+    while (_ls_looping) {                                                                      \
+      UTLIST_CASTASGN(_ls_p,list);                                                             \
+      UTLIST_CASTASGN(_ls_oldhead,list);                                                       \
+      (list) = NULL;                                                                           \
+      _ls_tail = NULL;                                                                         \
+      _ls_nmerges = 0;                                                                         \
+      while (_ls_p) {                                                                          \
+        _ls_nmerges++;                                                                         \
+        _ls_q = _ls_p;                                                                         \
+        _ls_psize = 0;                                                                         \
+        for (_ls_i = 0; _ls_i < _ls_insize; _ls_i++) {                                         \
+          _ls_psize++;                                                                         \
+          UTLIST_SV(_ls_q,list);                                                               \
+          if (UTLIST_NEXT(_ls_q,list,next) == _ls_oldhead) {                                   \
+            _ls_q = NULL;                                                                      \
+          } else {                                                                             \
+            _ls_q = UTLIST_NEXT(_ls_q,list,next);                                              \
+          }                                                                                    \
+          UTLIST_RS(list);                                                                     \
+          if (!_ls_q) break;                                                                   \
+        }                                                                                      \
+        _ls_qsize = _ls_insize;                                                                \
+        while (_ls_psize > 0 || (_ls_qsize > 0 && _ls_q)) {                                    \
+          if (_ls_psize == 0) {                                                                \
+            _ls_e = _ls_q; UTLIST_SV(_ls_q,list); _ls_q =                                      \
+              UTLIST_NEXT(_ls_q,list,next); UTLIST_RS(list); _ls_qsize--;                      \
+            if (_ls_q == _ls_oldhead) { _ls_q = NULL; }                                        \
+          } else if (_ls_qsize == 0 || !_ls_q) {                                               \
+            _ls_e = _ls_p; UTLIST_SV(_ls_p,list); _ls_p =                                      \
+              UTLIST_NEXT(_ls_p,list,next); UTLIST_RS(list); _ls_psize--;                      \
+            if (_ls_p == _ls_oldhead) { _ls_p = NULL; }                                        \
+          } else if (cmp(_ls_p,_ls_q) <= 0) {                                                  \
+            _ls_e = _ls_p; UTLIST_SV(_ls_p,list); _ls_p =                                      \
+              UTLIST_NEXT(_ls_p,list,next); UTLIST_RS(list); _ls_psize--;                      \
+            if (_ls_p == _ls_oldhead) { _ls_p = NULL; }                                        \
+          } else {                                                                             \
+            _ls_e = _ls_q; UTLIST_SV(_ls_q,list); _ls_q =                                      \
+              UTLIST_NEXT(_ls_q,list,next); UTLIST_RS(list); _ls_qsize--;                      \
+            if (_ls_q == _ls_oldhead) { _ls_q = NULL; }                                        \
+          }                                                                                    \
+          if (_ls_tail) {                                                                      \
+            UTLIST_SV(_ls_tail,list); UTLIST_NEXTASGN(_ls_tail,list,_ls_e,next); UTLIST_RS(list); \
+          } else {                                                                             \
+            UTLIST_CASTASGN(list,_ls_e);                                                       \
+          }                                                                                    \
+          UTLIST_SV(_ls_e,list); UTLIST_PREVASGN(_ls_e,list,_ls_tail,prev); UTLIST_RS(list);   \
+          _ls_tail = _ls_e;                                                                    \
+        }                                                                                      \
+        _ls_p = _ls_q;                                                                         \
+      }                                                                                        \
+      UTLIST_CASTASGN((list)->prev,_ls_tail);                                                  \
+      UTLIST_CASTASGN(_tmp,list);                                                              \
+      UTLIST_SV(_ls_tail,list); UTLIST_NEXTASGN(_ls_tail,list,_tmp,next); UTLIST_RS(list);     \
+      if (_ls_nmerges <= 1) {                                                                  \
+        _ls_looping=0;                                                                         \
+      }                                                                                        \
+      _ls_insize *= 2;                                                                         \
+    }                                                                                          \
+  }                                                                                            \
+} while (0)
+
+/******************************************************************************
+ * singly linked list macros (non-circular)                                   *
+ *****************************************************************************/
+#define LL_PREPEND(head,add)                                                                   \
+    LL_PREPEND2(head,add,next)
+
+#define LL_PREPEND2(head,add,next)                                                             \
+do {                                                                                           \
+  (add)->next = (head);                                                                        \
+  (head) = (add);                                                                              \
+} while (0)
+
+#define LL_CONCAT(head1,head2)                                                                 \
+    LL_CONCAT2(head1,head2,next)
+
+#define LL_CONCAT2(head1,head2,next)                                                           \
+do {                                                                                           \
+  LDECLTYPE(head1) _tmp;                                                                       \
+  if (head1) {                                                                                 \
+    _tmp = (head1);                                                                            \
+    while (_tmp->next) { _tmp = _tmp->next; }                                                  \
+    _tmp->next=(head2);                                                                        \
+  } else {                                                                                     \
+    (head1)=(head2);                                                                           \
+  }                                                                                            \
+} while (0)
+
+#define LL_APPEND(head,add)                                                                    \
+    LL_APPEND2(head,add,next)
+
+#define LL_APPEND2(head,add,next)                                                              \
+do {                                                                                           \
+  LDECLTYPE(head) _tmp;                                                                        \
+  (add)->next=NULL;                                                                            \
+  if (head) {                                                                                  \
+    _tmp = (head);                                                                             \
+    while (_tmp->next) { _tmp = _tmp->next; }                                                  \
+    _tmp->next=(add);                                                                          \
+  } else {                                                                                     \
+    (head)=(add);                                                                              \
+  }                                                                                            \
+} while (0)
+
+#define LL_INSERT_INORDER(head,add,cmp)                                                        \
+    LL_INSERT_INORDER2(head,add,cmp,next)
+
+#define LL_INSERT_INORDER2(head,add,cmp,next)                                                  \
+do {                                                                                           \
+  LDECLTYPE(head) _tmp;                                                                        \
+  if (head) {                                                                                  \
+    LL_LOWER_BOUND2(head, _tmp, add, cmp, next);                                               \
+    LL_APPEND_ELEM2(head, _tmp, add, next);                                                    \
+  } else {                                                                                     \
+    (head) = (add);                                                                            \
+    (head)->next = NULL;                                                                       \
+  }                                                                                            \
+} while (0)
+
+#define LL_LOWER_BOUND(head,elt,like,cmp)                                                      \
+    LL_LOWER_BOUND2(head,elt,like,cmp,next)
+
+#define LL_LOWER_BOUND2(head,elt,like,cmp,next)                                                \
+  do {                                                                                         \
+    if ((head) == NULL || (cmp(head, like)) >= 0) {                                            \
+      (elt) = NULL;                                                                            \
+    } else {                                                                                   \
+      for ((elt) = (head); (elt)->next != NULL; (elt) = (elt)->next) {                         \
+        if (cmp((elt)->next, like) >= 0) {                                                     \
+          break;                                                                               \
+        }                                                                                      \
+      }                                                                                        \
+    }                                                                                          \
+  } while (0)
+
+#define LL_DELETE(head,del)                                                                    \
+    LL_DELETE2(head,del,next)
+
+#define LL_DELETE2(head,del,next)                                                              \
+do {                                                                                           \
+  LDECLTYPE(head) _tmp;                                                                        \
+  if ((head) == (del)) {                                                                       \
+    (head)=(head)->next;                                                                       \
+  } else {                                                                                     \
+    _tmp = (head);                                                                             \
+    while (_tmp->next && (_tmp->next != (del))) {                                              \
+      _tmp = _tmp->next;                                                                       \
+    }                                                                                          \
+    if (_tmp->next) {                                                                          \
+      _tmp->next = (del)->next;                                                                \
+    }                                                                                          \
+  }                                                                                            \
+} while (0)
+
+#define LL_COUNT(head,el,counter)                                                              \
+    LL_COUNT2(head,el,counter,next)                                                            \
+
+#define LL_COUNT2(head,el,counter,next)                                                        \
+do {                                                                                           \
+  (counter) = 0;                                                                               \
+  LL_FOREACH2(head,el,next) { ++(counter); }                                                   \
+} while (0)
+
+#define LL_FOREACH(head,el)                                                                    \
+    LL_FOREACH2(head,el,next)
+
+#define LL_FOREACH2(head,el,next)                                                              \
+    for ((el) = (head); el; (el) = (el)->next)
+
+#define LL_FOREACH_SAFE(head,el,tmp)                                                           \
+    LL_FOREACH_SAFE2(head,el,tmp,next)
+
+#define LL_FOREACH_SAFE2(head,el,tmp,next)                                                     \
+  for ((el) = (head); (el) && ((tmp) = (el)->next, 1); (el) = (tmp))
+
+#define LL_SEARCH_SCALAR(head,out,field,val)                                                   \
+    LL_SEARCH_SCALAR2(head,out,field,val,next)
+
+#define LL_SEARCH_SCALAR2(head,out,field,val,next)                                             \
+do {                                                                                           \
+    LL_FOREACH2(head,out,next) {                                                               \
+      if ((out)->field == (val)) break;                                                        \
+    }                                                                                          \
+} while (0)
+
+#define LL_SEARCH(head,out,elt,cmp)                                                            \
+    LL_SEARCH2(head,out,elt,cmp,next)
+
+#define LL_SEARCH2(head,out,elt,cmp,next)                                                      \
+do {                                                                                           \
+    LL_FOREACH2(head,out,next) {                                                               \
+      if ((cmp(out,elt))==0) break;                                                            \
+    }                                                                                          \
+} while (0)
+
+#define LL_REPLACE_ELEM2(head, el, add, next)                                                  \
+do {                                                                                           \
+ LDECLTYPE(head) _tmp;                                                                         \
+ assert((head) != NULL);                                                                       \
+ assert((el) != NULL);                                                                         \
+ assert((add) != NULL);                                                                        \
+ (add)->next = (el)->next;                                                                     \
+ if ((head) == (el)) {                                                                         \
+  (head) = (add);                                                                              \
+ } else {                                                                                      \
+  _tmp = (head);                                                                               \
+  while (_tmp->next && (_tmp->next != (el))) {                                                 \
+   _tmp = _tmp->next;                                                                          \
+  }                                                                                            \
+  if (_tmp->next) {                                                                            \
+    _tmp->next = (add);                                                                        \
+  }                                                                                            \
+ }                                                                                             \
+} while (0)
+
+#define LL_REPLACE_ELEM(head, el, add)                                                         \
+    LL_REPLACE_ELEM2(head, el, add, next)
+
+#define LL_PREPEND_ELEM2(head, el, add, next)                                                  \
+do {                                                                                           \
+ if (el) {                                                                                     \
+  LDECLTYPE(head) _tmp;                                                                        \
+  assert((head) != NULL);                                                                      \
+  assert((add) != NULL);                                                                       \
+  (add)->next = (el);                                                                          \
+  if ((head) == (el)) {                                                                        \
+   (head) = (add);                                                                             \
+  } else {                                                                                     \
+   _tmp = (head);                                                                              \
+   while (_tmp->next && (_tmp->next != (el))) {                                                \
+    _tmp = _tmp->next;                                                                         \
+   }                                                                                           \
+   if (_tmp->next) {                                                                           \
+     _tmp->next = (add);                                                                       \
+   }                                                                                           \
+  }                                                                                            \
+ } else {                                                                                      \
+  LL_APPEND2(head, add, next);                                                                 \
+ }                                                                                             \
+} while (0)                                                                                    \
+
+#define LL_PREPEND_ELEM(head, el, add)                                                         \
+    LL_PREPEND_ELEM2(head, el, add, next)
+
+#define LL_APPEND_ELEM2(head, el, add, next)                                                   \
+do {                                                                                           \
+ if (el) {                                                                                     \
+  assert((head) != NULL);                                                                      \
+  assert((add) != NULL);                                                                       \
+  (add)->next = (el)->next;                                                                    \
+  (el)->next = (add);                                                                          \
+ } else {                                                                                      \
+  LL_PREPEND2(head, add, next);                                                                \
+ }                                                                                             \
+} while (0)                                                                                    \
+
+#define LL_APPEND_ELEM(head, el, add)                                                          \
+    LL_APPEND_ELEM2(head, el, add, next)
+
+#ifdef NO_DECLTYPE
+/* Here are VS2008 / NO_DECLTYPE replacements for a few functions */
+
+#undef LL_CONCAT2
+#define LL_CONCAT2(head1,head2,next)                                                           \
+do {                                                                                           \
+  char *_tmp;                                                                                  \
+  if (head1) {                                                                                 \
+    _tmp = (char*)(head1);                                                                     \
+    while ((head1)->next) { (head1) = (head1)->next; }                                         \
+    (head1)->next = (head2);                                                                   \
+    UTLIST_RS(head1);                                                                          \
+  } else {                                                                                     \
+    (head1)=(head2);                                                                           \
+  }                                                                                            \
+} while (0)
+
+#undef LL_APPEND2
+#define LL_APPEND2(head,add,next)                                                              \
+do {                                                                                           \
+  if (head) {                                                                                  \
+    (add)->next = head;     /* use add->next as a temp variable */                             \
+    while ((add)->next->next) { (add)->next = (add)->next->next; }                             \
+    (add)->next->next=(add);                                                                   \
+  } else {                                                                                     \
+    (head)=(add);                                                                              \
+  }                                                                                            \
+  (add)->next=NULL;                                                                            \
+} while (0)
+
+#undef LL_INSERT_INORDER2
+#define LL_INSERT_INORDER2(head,add,cmp,next)                                                  \
+do {                                                                                           \
+  if ((head) == NULL || (cmp(head, add)) >= 0) {                                               \
+    (add)->next = (head);                                                                      \
+    (head) = (add);                                                                            \
+  } else {                                                                                     \
+    char *_tmp = (char*)(head);                                                                \
+    while ((head)->next != NULL && (cmp((head)->next, add)) < 0) {                             \
+      (head) = (head)->next;                                                                   \
+    }                                                                                          \
+    (add)->next = (head)->next;                                                                \
+    (head)->next = (add);                                                                      \
+    UTLIST_RS(head);                                                                           \
+  }                                                                                            \
+} while (0)
+
+#undef LL_DELETE2
+#define LL_DELETE2(head,del,next)                                                              \
+do {                                                                                           \
+  if ((head) == (del)) {                                                                       \
+    (head)=(head)->next;                                                                       \
+  } else {                                                                                     \
+    char *_tmp = (char*)(head);                                                                \
+    while ((head)->next && ((head)->next != (del))) {                                          \
+      (head) = (head)->next;                                                                   \
+    }                                                                                          \
+    if ((head)->next) {                                                                        \
+      (head)->next = ((del)->next);                                                            \
+    }                                                                                          \
+    UTLIST_RS(head);                                                                           \
+  }                                                                                            \
+} while (0)
+
+#undef LL_REPLACE_ELEM2
+#define LL_REPLACE_ELEM2(head, el, add, next)                                                  \
+do {                                                                                           \
+  assert((head) != NULL);                                                                      \
+  assert((el) != NULL);                                                                        \
+  assert((add) != NULL);                                                                       \
+  if ((head) == (el)) {                                                                        \
+    (head) = (add);                                                                            \
+  } else {                                                                                     \
+    (add)->next = head;                                                                        \
+    while ((add)->next->next && ((add)->next->next != (el))) {                                 \
+      (add)->next = (add)->next->next;                                                         \
+    }                                                                                          \
+    if ((add)->next->next) {                                                                   \
+      (add)->next->next = (add);                                                               \
+    }                                                                                          \
+  }                                                                                            \
+  (add)->next = (el)->next;                                                                    \
+} while (0)
+
+#undef LL_PREPEND_ELEM2
+#define LL_PREPEND_ELEM2(head, el, add, next)                                                  \
+do {                                                                                           \
+  if (el) {                                                                                    \
+    assert((head) != NULL);                                                                    \
+    assert((add) != NULL);                                                                     \
+    if ((head) == (el)) {                                                                      \
+      (head) = (add);                                                                          \
+    } else {                                                                                   \
+      (add)->next = (head);                                                                    \
+      while ((add)->next->next && ((add)->next->next != (el))) {                               \
+        (add)->next = (add)->next->next;                                                       \
+      }                                                                                        \
+      if ((add)->next->next) {                                                                 \
+        (add)->next->next = (add);                                                             \
+      }                                                                                        \
+    }                                                                                          \
+    (add)->next = (el);                                                                        \
+  } else {                                                                                     \
+    LL_APPEND2(head, add, next);                                                               \
+  }                                                                                            \
+} while (0)                                                                                    \
+
+#endif /* NO_DECLTYPE */
+
+/******************************************************************************
+ * doubly linked list macros (non-circular)                                   *
+ *****************************************************************************/
+#define DL_PREPEND(head,add)                                                                   \
+    DL_PREPEND2(head,add,prev,next)
+
+#define DL_PREPEND2(head,add,prev,next)                                                        \
+do {                                                                                           \
+ (add)->next = (head);                                                                         \
+ if (head) {                                                                                   \
+   (add)->prev = (head)->prev;                                                                 \
+   (head)->prev = (add);                                                                       \
+ } else {                                                                                      \
+   (add)->prev = (add);                                                                        \
+ }                                                                                             \
+ (head) = (add);                                                                               \
+} while (0)
+
+#define DL_APPEND(head,add)                                                                    \
+    DL_APPEND2(head,add,prev,next)
+
+#define DL_APPEND2(head,add,prev,next)                                                         \
+do {                                                                                           \
+  if (head) {                                                                                  \
+      (add)->prev = (head)->prev;                                                              \
+      (head)->prev->next = (add);                                                              \
+      (head)->prev = (add);                                                                    \
+      (add)->next = NULL;                                                                      \
+  } else {                                                                                     \
+      (head)=(add);                                                                            \
+      (head)->prev = (head);                                                                   \
+      (head)->next = NULL;                                                                     \
+  }                                                                                            \
+} while (0)
+
+#define DL_INSERT_INORDER(head,add,cmp)                                                        \
+    DL_INSERT_INORDER2(head,add,cmp,prev,next)
+
+#define DL_INSERT_INORDER2(head,add,cmp,prev,next)                                             \
+do {                                                                                           \
+  LDECLTYPE(head) _tmp;                                                                        \
+  if (head) {                                                                                  \
+    DL_LOWER_BOUND2(head, _tmp, add, cmp, next);                                               \
+    DL_APPEND_ELEM2(head, _tmp, add, prev, next);                                              \
+  } else {                                                                                     \
+    (head) = (add);                                                                            \
+    (head)->prev = (head);                                                                     \
+    (head)->next = NULL;                                                                       \
+  }                                                                                            \
+} while (0)
+
+#define DL_LOWER_BOUND(head,elt,like,cmp)                                                      \
+    DL_LOWER_BOUND2(head,elt,like,cmp,next)
+
+#define DL_LOWER_BOUND2(head,elt,like,cmp,next)                                                \
+do {                                                                                           \
+  if ((head) == NULL || (cmp(head, like)) >= 0) {                                              \
+    (elt) = NULL;                                                                              \
+  } else {                                                                                     \
+    for ((elt) = (head); (elt)->next != NULL; (elt) = (elt)->next) {                           \
+      if ((cmp((elt)->next, like)) >= 0) {                                                     \
+        break;                                                                                 \
+      }                                                                                        \
+    }                                                                                          \
+  }                                                                                            \
+} while (0)
+
+#define DL_CONCAT(head1,head2)                                                                 \
+    DL_CONCAT2(head1,head2,prev,next)
+
+#define DL_CONCAT2(head1,head2,prev,next)                                                      \
+do {                                                                                           \
+  LDECLTYPE(head1) _tmp;                                                                       \
+  if (head2) {                                                                                 \
+    if (head1) {                                                                               \
+        UTLIST_CASTASGN(_tmp, (head2)->prev);                                                  \
+        (head2)->prev = (head1)->prev;                                                         \
+        (head1)->prev->next = (head2);                                                         \
+        UTLIST_CASTASGN((head1)->prev, _tmp);                                                  \
+    } else {                                                                                   \
+        (head1)=(head2);                                                                       \
+    }                                                                                          \
+  }                                                                                            \
+} while (0)
+
+#define DL_DELETE(head,del)                                                                    \
+    DL_DELETE2(head,del,prev,next)
+
+#define DL_DELETE2(head,del,prev,next)                                                         \
+do {                                                                                           \
+  assert((head) != NULL);                                                                      \
+  assert((del)->prev != NULL);                                                                 \
+  if ((del)->prev == (del)) {                                                                  \
+      (head)=NULL;                                                                             \
+  } else if ((del)==(head)) {                                                                  \
+      (del)->next->prev = (del)->prev;                                                         \
+      (head) = (del)->next;                                                                    \
+  } else {                                                                                     \
+      (del)->prev->next = (del)->next;                                                         \
+      if ((del)->next) {                                                                       \
+          (del)->next->prev = (del)->prev;                                                     \
+      } else {                                                                                 \
+          (head)->prev = (del)->prev;                                                          \
+      }                                                                                        \
+  }                                                                                            \
+} while (0)
+
+#define DL_COUNT(head,el,counter)                                                              \
+    DL_COUNT2(head,el,counter,next)                                                            \
+
+#define DL_COUNT2(head,el,counter,next)                                                        \
+do {                                                                                           \
+  (counter) = 0;                                                                               \
+  DL_FOREACH2(head,el,next) { ++(counter); }                                                   \
+} while (0)
+
+#define DL_FOREACH(head,el)                                                                    \
+    DL_FOREACH2(head,el,next)
+
+#define DL_FOREACH2(head,el,next)                                                              \
+    for ((el) = (head); el; (el) = (el)->next)
+
+/* this version is safe for deleting the elements during iteration */
+#define DL_FOREACH_SAFE(head,el,tmp)                                                           \
+    DL_FOREACH_SAFE2(head,el,tmp,next)
+
+#define DL_FOREACH_SAFE2(head,el,tmp,next)                                                     \
+  for ((el) = (head); (el) && ((tmp) = (el)->next, 1); (el) = (tmp))
+
+/* these are identical to their singly-linked list counterparts */
+#define DL_SEARCH_SCALAR LL_SEARCH_SCALAR
+#define DL_SEARCH LL_SEARCH
+#define DL_SEARCH_SCALAR2 LL_SEARCH_SCALAR2
+#define DL_SEARCH2 LL_SEARCH2
+
+#define DL_REPLACE_ELEM2(head, el, add, prev, next)                                            \
+do {                                                                                           \
+ assert((head) != NULL);                                                                       \
+ assert((el) != NULL);                                                                         \
+ assert((add) != NULL);                                                                        \
+ if ((head) == (el)) {                                                                         \
+  (head) = (add);                                                                              \
+  (add)->next = (el)->next;                                                                    \
+  if ((el)->next == NULL) {                                                                    \
+   (add)->prev = (add);                                                                        \
+  } else {                                                                                     \
+   (add)->prev = (el)->prev;                                                                   \
+   (add)->next->prev = (add);                                                                  \
+  }                                                                                            \
+ } else {                                                                                      \
+  (add)->next = (el)->next;                                                                    \
+  (add)->prev = (el)->prev;                                                                    \
+  (add)->prev->next = (add);                                                                   \
+  if ((el)->next == NULL) {                                                                    \
+   (head)->prev = (add);                                                                       \
+  } else {                                                                                     \
+   (add)->next->prev = (add);                                                                  \
+  }                                                                                            \
+ }                                                                                             \
+} while (0)
+
+#define DL_REPLACE_ELEM(head, el, add)                                                         \
+    DL_REPLACE_ELEM2(head, el, add, prev, next)
+
+#define DL_PREPEND_ELEM2(head, el, add, prev, next)                                            \
+do {                                                                                           \
+ if (el) {                                                                                     \
+  assert((head) != NULL);                                                                      \
+  assert((add) != NULL);                                                                       \
+  (add)->next = (el);                                                                          \
+  (add)->prev = (el)->prev;                                                                    \
+  (el)->prev = (add);                                                                          \
+  if ((head) == (el)) {                                                                        \
+   (head) = (add);                                                                             \
+  } else {                                                                                     \
+   (add)->prev->next = (add);                                                                  \
+  }                                                                                            \
+ } else {                                                                                      \
+  DL_APPEND2(head, add, prev, next);                                                           \
+ }                                                                                             \
+} while (0)                                                                                    \
+
+#define DL_PREPEND_ELEM(head, el, add)                                                         \
+    DL_PREPEND_ELEM2(head, el, add, prev, next)
+
+#define DL_APPEND_ELEM2(head, el, add, prev, next)                                             \
+do {                                                                                           \
+ if (el) {                                                                                     \
+  assert((head) != NULL);                                                                      \
+  assert((add) != NULL);                                                                       \
+  (add)->next = (el)->next;                                                                    \
+  (add)->prev = (el);                                                                          \
+  (el)->next = (add);                                                                          \
+  if ((add)->next) {                                                                           \
+   (add)->next->prev = (add);                                                                  \
+  } else {                                                                                     \
+   (head)->prev = (add);                                                                       \
+  }                                                                                            \
+ } else {                                                                                      \
+  DL_PREPEND2(head, add, prev, next);                                                          \
+ }                                                                                             \
+} while (0)                                                                                    \
+
+#define DL_APPEND_ELEM(head, el, add)                                                          \
+   DL_APPEND_ELEM2(head, el, add, prev, next)
+
+#ifdef NO_DECLTYPE
+/* Here are VS2008 / NO_DECLTYPE replacements for a few functions */
+
+#undef DL_INSERT_INORDER2
+#define DL_INSERT_INORDER2(head,add,cmp,prev,next)                                             \
+do {                                                                                           \
+  if ((head) == NULL) {                                                                        \
+    (add)->prev = (add);                                                                       \
+    (add)->next = NULL;                                                                        \
+    (head) = (add);                                                                            \
+  } else if ((cmp(head, add)) >= 0) {                                                          \
+    (add)->prev = (head)->prev;                                                                \
+    (add)->next = (head);                                                                      \
+    (head)->prev = (add);                                                                      \
+    (head) = (add);                                                                            \
+  } else {                                                                                     \
+    char *_tmp = (char*)(head);                                                                \
+    while ((head)->next && (cmp((head)->next, add)) < 0) {                                     \
+      (head) = (head)->next;                                                                   \
+    }                                                                                          \
+    (add)->prev = (head);                                                                      \
+    (add)->next = (head)->next;                                                                \
+    (head)->next = (add);                                                                      \
+    UTLIST_RS(head);                                                                           \
+    if ((add)->next) {                                                                         \
+      (add)->next->prev = (add);                                                               \
+    } else {                                                                                   \
+      (head)->prev = (add);                                                                    \
+    }                                                                                          \
+  }                                                                                            \
+} while (0)
+#endif /* NO_DECLTYPE */
+
+/******************************************************************************
+ * circular doubly linked list macros                                         *
+ *****************************************************************************/
+#define CDL_APPEND(head,add)                                                                   \
+    CDL_APPEND2(head,add,prev,next)
+
+#define CDL_APPEND2(head,add,prev,next)                                                        \
+do {                                                                                           \
+ if (head) {                                                                                   \
+   (add)->prev = (head)->prev;                                                                 \
+   (add)->next = (head);                                                                       \
+   (head)->prev = (add);                                                                       \
+   (add)->prev->next = (add);                                                                  \
+ } else {                                                                                      \
+   (add)->prev = (add);                                                                        \
+   (add)->next = (add);                                                                        \
+   (head) = (add);                                                                             \
+ }                                                                                             \
+} while (0)
+
+#define CDL_PREPEND(head,add)                                                                  \
+    CDL_PREPEND2(head,add,prev,next)
+
+#define CDL_PREPEND2(head,add,prev,next)                                                       \
+do {                                                                                           \
+ if (head) {                                                                                   \
+   (add)->prev = (head)->prev;                                                                 \
+   (add)->next = (head);                                                                       \
+   (head)->prev = (add);                                                                       \
+   (add)->prev->next = (add);                                                                  \
+ } else {                                                                                      \
+   (add)->prev = (add);                                                                        \
+   (add)->next = (add);                                                                        \
+ }                                                                                             \
+ (head) = (add);                                                                               \
+} while (0)
+
+#define CDL_INSERT_INORDER(head,add,cmp)                                                       \
+    CDL_INSERT_INORDER2(head,add,cmp,prev,next)
+
+#define CDL_INSERT_INORDER2(head,add,cmp,prev,next)                                            \
+do {                                                                                           \
+  LDECLTYPE(head) _tmp;                                                                        \
+  if (head) {                                                                                  \
+    CDL_LOWER_BOUND2(head, _tmp, add, cmp, next);                                              \
+    CDL_APPEND_ELEM2(head, _tmp, add, prev, next);                                             \
+  } else {                                                                                     \
+    (head) = (add);                                                                            \
+    (head)->next = (head);                                                                     \
+    (head)->prev = (head);                                                                     \
+  }                                                                                            \
+} while (0)
+
+#define CDL_LOWER_BOUND(head,elt,like,cmp)                                                     \
+    CDL_LOWER_BOUND2(head,elt,like,cmp,next)
+
+#define CDL_LOWER_BOUND2(head,elt,like,cmp,next)                                               \
+do {                                                                                           \
+  if ((head) == NULL || (cmp(head, like)) >= 0) {                                              \
+    (elt) = NULL;                                                                              \
+  } else {                                                                                     \
+    for ((elt) = (head); (elt)->next != (head); (elt) = (elt)->next) {                         \
+      if ((cmp((elt)->next, like)) >= 0) {                                                     \
+        break;                                                                                 \
+      }                                                                                        \
+    }                                                                                          \
+  }                                                                                            \
+} while (0)
+
+#define CDL_DELETE(head,del)                                                                   \
+    CDL_DELETE2(head,del,prev,next)
+
+#define CDL_DELETE2(head,del,prev,next)                                                        \
+do {                                                                                           \
+  if (((head)==(del)) && ((head)->next == (head))) {                                           \
+      (head) = NULL;                                                                           \
+  } else {                                                                                     \
+     (del)->next->prev = (del)->prev;                                                          \
+     (del)->prev->next = (del)->next;                                                          \
+     if ((del) == (head)) (head)=(del)->next;                                                  \
+  }                                                                                            \
+} while (0)
+
+#define CDL_COUNT(head,el,counter)                                                             \
+    CDL_COUNT2(head,el,counter,next)                                                           \
+
+#define CDL_COUNT2(head, el, counter,next)                                                     \
+do {                                                                                           \
+  (counter) = 0;                                                                               \
+  CDL_FOREACH2(head,el,next) { ++(counter); }                                                  \
+} while (0)
+
+#define CDL_FOREACH(head,el)                                                                   \
+    CDL_FOREACH2(head,el,next)
+
+#define CDL_FOREACH2(head,el,next)                                                             \
+    for ((el)=(head);el;(el)=(((el)->next==(head)) ? NULL : (el)->next))
+
+#define CDL_FOREACH_SAFE(head,el,tmp1,tmp2)                                                    \
+    CDL_FOREACH_SAFE2(head,el,tmp1,tmp2,prev,next)
+
+#define CDL_FOREACH_SAFE2(head,el,tmp1,tmp2,prev,next)                                         \
+  for ((el) = (head), (tmp1) = (head) ? (head)->prev : NULL;                                   \
+       (el) && ((tmp2) = (el)->next, 1);                                                       \
+       (el) = ((el) == (tmp1) ? NULL : (tmp2)))
+
+#define CDL_SEARCH_SCALAR(head,out,field,val)                                                  \
+    CDL_SEARCH_SCALAR2(head,out,field,val,next)
+
+#define CDL_SEARCH_SCALAR2(head,out,field,val,next)                                            \
+do {                                                                                           \
+    CDL_FOREACH2(head,out,next) {                                                              \
+      if ((out)->field == (val)) break;                                                        \
+    }                                                                                          \
+} while (0)
+
+#define CDL_SEARCH(head,out,elt,cmp)                                                           \
+    CDL_SEARCH2(head,out,elt,cmp,next)
+
+#define CDL_SEARCH2(head,out,elt,cmp,next)                                                     \
+do {                                                                                           \
+    CDL_FOREACH2(head,out,next) {                                                              \
+      if ((cmp(out,elt))==0) break;                                                            \
+    }                                                                                          \
+} while (0)
+
+#define CDL_REPLACE_ELEM2(head, el, add, prev, next)                                           \
+do {                                                                                           \
+ assert((head) != NULL);                                                                       \
+ assert((el) != NULL);                                                                         \
+ assert((add) != NULL);                                                                        \
+ if ((el)->next == (el)) {                                                                     \
+  (add)->next = (add);                                                                         \
+  (add)->prev = (add);                                                                         \
+  (head) = (add);                                                                              \
+ } else {                                                                                      \
+  (add)->next = (el)->next;                                                                    \
+  (add)->prev = (el)->prev;                                                                    \
+  (add)->next->prev = (add);                                                                   \
+  (add)->prev->next = (add);                                                                   \
+  if ((head) == (el)) {                                                                        \
+   (head) = (add);                                                                             \
+  }                                                                                            \
+ }                                                                                             \
+} while (0)
+
+#define CDL_REPLACE_ELEM(head, el, add)                                                        \
+    CDL_REPLACE_ELEM2(head, el, add, prev, next)
+
+#define CDL_PREPEND_ELEM2(head, el, add, prev, next)                                           \
+do {                                                                                           \
+  if (el) {                                                                                    \
+    assert((head) != NULL);                                                                    \
+    assert((add) != NULL);                                                                     \
+    (add)->next = (el);                                                                        \
+    (add)->prev = (el)->prev;                                                                  \
+    (el)->prev = (add);                                                                        \
+    (add)->prev->next = (add);                                                                 \
+    if ((head) == (el)) {                                                                      \
+      (head) = (add);                                                                          \
+    }                                                                                          \
+  } else {                                                                                     \
+    CDL_APPEND2(head, add, prev, next);                                                        \
+  }                                                                                            \
+} while (0)
+
+#define CDL_PREPEND_ELEM(head, el, add)                                                        \
+    CDL_PREPEND_ELEM2(head, el, add, prev, next)
+
+#define CDL_APPEND_ELEM2(head, el, add, prev, next)                                            \
+do {                                                                                           \
+ if (el) {                                                                                     \
+  assert((head) != NULL);                                                                      \
+  assert((add) != NULL);                                                                       \
+  (add)->next = (el)->next;                                                                    \
+  (add)->prev = (el);                                                                          \
+  (el)->next = (add);                                                                          \
+  (add)->next->prev = (add);                                                                   \
+ } else {                                                                                      \
+  CDL_PREPEND2(head, add, prev, next);                                                         \
+ }                                                                                             \
+} while (0)
+
+#define CDL_APPEND_ELEM(head, el, add)                                                         \
+    CDL_APPEND_ELEM2(head, el, add, prev, next)
+
+#ifdef NO_DECLTYPE
+/* Here are VS2008 / NO_DECLTYPE replacements for a few functions */
+
+#undef CDL_INSERT_INORDER2
+#define CDL_INSERT_INORDER2(head,add,cmp,prev,next)                                            \
+do {                                                                                           \
+  if ((head) == NULL) {                                                                        \
+    (add)->prev = (add);                                                                       \
+    (add)->next = (add);                                                                       \
+    (head) = (add);                                                                            \
+  } else if ((cmp(head, add)) >= 0) {                                                          \
+    (add)->prev = (head)->prev;                                                                \
+    (add)->next = (head);                                                                      \
+    (add)->prev->next = (add);                                                                 \
+    (head)->prev = (add);                                                                      \
+    (head) = (add);                                                                            \
+  } else {                                                                                     \
+    char *_tmp = (char*)(head);                                                                \
+    while ((char*)(head)->next != _tmp && (cmp((head)->next, add)) < 0) {                      \
+      (head) = (head)->next;                                                                   \
+    }                                                                                          \
+    (add)->prev = (head);                                                                      \
+    (add)->next = (head)->next;                                                                \
+    (add)->next->prev = (add);                                                                 \
+    (head)->next = (add);                                                                      \
+    UTLIST_RS(head);                                                                           \
+  }                                                                                            \
+} while (0)
+#endif /* NO_DECLTYPE */
+
+#endif /* UTLIST_H */
diff --git a/libs/libmosquitto/libmosquitto.vcxproj b/libs/libmosquitto/libmosquitto.vcxproj
new file mode 100644
index 0000000000..a9154fd38c
--- /dev/null
+++ b/libs/libmosquitto/libmosquitto.vcxproj
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{6D19209B-ECE7-4B9C-941C-1AA2B484F199}</ProjectGuid>
+    <ProjectName>libmosquitto</ProjectName>
+    <TargetName>libmosquitto</TargetName>
+  </PropertyGroup>
+  <Import Project="$(ProjectDir)..\..\build\vc.common\lib.props" />
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <AdditionalIncludeDirectories>.\include\;.\src\;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>libmosquitto_EXPORTS;WIN32;WITH_TLS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>libeay32.lib;ssleay32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+</Project>
\ No newline at end of file
diff --git a/libs/libmosquitto/libmosquitto.vcxproj.filters b/libs/libmosquitto/libmosquitto.vcxproj.filters
new file mode 100644
index 0000000000..8f90aeb3d5
--- /dev/null
+++ b/libs/libmosquitto/libmosquitto.vcxproj.filters
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(ProjectDir)..\..\build\vc.common\common.filters" />
+</Project>
diff --git a/libs/libmosquitto/src/actions.c b/libs/libmosquitto/src/actions.c
new file mode 100644
index 0000000000..a5bf673fa9
--- /dev/null
+++ b/libs/libmosquitto/src/actions.c
@@ -0,0 +1,260 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <string.h>
+
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+#include "memory_mosq.h"
+#include "messages_mosq.h"
+#include "mqtt_protocol.h"
+#include "net_mosq.h"
+#include "packet_mosq.h"
+#include "send_mosq.h"
+#include "util_mosq.h"
+
+
+int mosquitto_publish(struct mosquitto *mosq, int *mid, const char *topic, int payloadlen, const void *payload, int qos, bool retain)
+{
+	return mosquitto_publish_v5(mosq, mid, topic, payloadlen, payload, qos, retain, NULL);
+}
+
+int mosquitto_publish_v5(struct mosquitto *mosq, int *mid, const char *topic, int payloadlen, const void *payload, int qos, bool retain, const mosquitto_property *properties)
+{
+	struct mosquitto_message_all *message;
+	uint16_t local_mid;
+	const mosquitto_property *p;
+	const mosquitto_property *outgoing_properties = NULL;
+	mosquitto_property local_property;
+	bool have_topic_alias;
+	int rc;
+	int tlen = 0;
+	uint32_t remaining_length;
+
+	if(!mosq || qos<0 || qos>2) return MOSQ_ERR_INVAL;
+	if(mosq->protocol != mosq_p_mqtt5 && properties) return MOSQ_ERR_NOT_SUPPORTED;
+	if(qos > mosq->maximum_qos) return MOSQ_ERR_QOS_NOT_SUPPORTED;
+
+	if(properties){
+		if(properties->client_generated){
+			outgoing_properties = properties;
+		}else{
+			memcpy(&local_property, properties, sizeof(mosquitto_property));
+			local_property.client_generated = true;
+			local_property.next = NULL;
+			outgoing_properties = &local_property;
+		}
+		rc = mosquitto_property_check_all(CMD_PUBLISH, outgoing_properties);
+		if(rc) return rc;
+	}
+
+	if(!topic || STREMPTY(topic)){
+		if(topic) topic = NULL;
+
+		if(mosq->protocol == mosq_p_mqtt5){
+			p = outgoing_properties;
+			have_topic_alias = false;
+			while(p){
+				if(p->identifier == MQTT_PROP_TOPIC_ALIAS){
+					have_topic_alias = true;
+					break;
+				}
+				p = p->next;
+			}
+			if(have_topic_alias == false){
+				return MOSQ_ERR_INVAL;
+			}
+		}else{
+			return MOSQ_ERR_INVAL;
+		}
+	}else{
+		tlen = strlen(topic);
+		if(mosquitto_validate_utf8(topic, tlen)) return MOSQ_ERR_MALFORMED_UTF8;
+		if(payloadlen < 0 || payloadlen > MQTT_MAX_PAYLOAD) return MOSQ_ERR_PAYLOAD_SIZE;
+		if(mosquitto_pub_topic_check(topic) != MOSQ_ERR_SUCCESS){
+			return MOSQ_ERR_INVAL;
+		}
+	}
+
+	if(mosq->maximum_packet_size > 0){
+		remaining_length = 1 + 2+tlen + payloadlen + property__get_length_all(outgoing_properties);
+		if(qos > 0){
+			remaining_length++;
+		}
+		if(packet__check_oversize(mosq, remaining_length)){
+			return MOSQ_ERR_OVERSIZE_PACKET;
+		}
+	}
+
+	local_mid = mosquitto__mid_generate(mosq);
+	if(mid){
+		*mid = local_mid;
+	}
+
+	if(qos == 0){
+		return send__publish(mosq, local_mid, topic, payloadlen, payload, qos, retain, false, outgoing_properties, NULL, 0);
+	}else{
+		message = mosquitto__calloc(1, sizeof(struct mosquitto_message_all));
+		if(!message) return MOSQ_ERR_NOMEM;
+
+		message->next = NULL;
+		message->timestamp = mosquitto_time();
+		message->msg.mid = local_mid;
+		if(topic){
+			message->msg.topic = mosquitto__strdup(topic);
+			if(!message->msg.topic){
+				message__cleanup(&message);
+				return MOSQ_ERR_NOMEM;
+			}
+		}
+		if(payloadlen){
+			message->msg.payloadlen = payloadlen;
+			message->msg.payload = mosquitto__malloc(payloadlen*sizeof(uint8_t));
+			if(!message->msg.payload){
+				message__cleanup(&message);
+				return MOSQ_ERR_NOMEM;
+			}
+			memcpy(message->msg.payload, payload, payloadlen*sizeof(uint8_t));
+		}else{
+			message->msg.payloadlen = 0;
+			message->msg.payload = NULL;
+		}
+		message->msg.qos = qos;
+		message->msg.retain = retain;
+		message->dup = false;
+
+		pthread_mutex_lock(&mosq->msgs_out.mutex);
+		message->state = mosq_ms_invalid;
+		message__queue(mosq, message, mosq_md_out);
+		pthread_mutex_unlock(&mosq->msgs_out.mutex);
+		return MOSQ_ERR_SUCCESS;
+	}
+}
+
+
+int mosquitto_subscribe(struct mosquitto *mosq, int *mid, const char *sub, int qos)
+{
+	return mosquitto_subscribe_multiple(mosq, mid, 1, (char *const *const)&sub, qos, 0, NULL);
+}
+
+
+int mosquitto_subscribe_v5(struct mosquitto *mosq, int *mid, const char *sub, int qos, int options, const mosquitto_property *properties)
+{
+	return mosquitto_subscribe_multiple(mosq, mid, 1, (char *const *const)&sub, qos, options, properties);
+}
+
+
+int mosquitto_subscribe_multiple(struct mosquitto *mosq, int *mid, int sub_count, char *const *const sub, int qos, int options, const mosquitto_property *properties)
+{
+	const mosquitto_property *outgoing_properties = NULL;
+	mosquitto_property local_property;
+	int i;
+	int rc;
+	uint32_t remaining_length = 0;
+	int slen;
+
+	if(!mosq || !sub_count || !sub) return MOSQ_ERR_INVAL;
+	if(mosq->protocol != mosq_p_mqtt5 && properties) return MOSQ_ERR_NOT_SUPPORTED;
+	if(qos < 0 || qos > 2) return MOSQ_ERR_INVAL;
+	if((options & 0x30) == 0x30 || (options & 0xC0) != 0) return MOSQ_ERR_INVAL;
+	if(mosq->sock == INVALID_SOCKET) return MOSQ_ERR_NO_CONN;
+
+	if(properties){
+		if(properties->client_generated){
+			outgoing_properties = properties;
+		}else{
+			memcpy(&local_property, properties, sizeof(mosquitto_property));
+			local_property.client_generated = true;
+			local_property.next = NULL;
+			outgoing_properties = &local_property;
+		}
+		rc = mosquitto_property_check_all(CMD_SUBSCRIBE, outgoing_properties);
+		if(rc) return rc;
+	}
+
+	for(i=0; i<sub_count; i++){
+		if(mosquitto_sub_topic_check(sub[i])) return MOSQ_ERR_INVAL;
+		slen = strlen(sub[i]);
+		if(mosquitto_validate_utf8(sub[i], slen)) return MOSQ_ERR_MALFORMED_UTF8;
+		remaining_length += 2+slen + 1;
+	}
+
+	if(mosq->maximum_packet_size > 0){
+		remaining_length += 2 + property__get_length_all(outgoing_properties);
+		if(packet__check_oversize(mosq, remaining_length)){
+			return MOSQ_ERR_OVERSIZE_PACKET;
+		}
+	}
+
+	return send__subscribe(mosq, mid, sub_count, sub, qos|options, outgoing_properties);
+}
+
+
+int mosquitto_unsubscribe(struct mosquitto *mosq, int *mid, const char *sub)
+{
+	return mosquitto_unsubscribe_multiple(mosq, mid, 1, (char *const *const)&sub, NULL);
+}
+
+int mosquitto_unsubscribe_v5(struct mosquitto *mosq, int *mid, const char *sub, const mosquitto_property *properties)
+{
+	return mosquitto_unsubscribe_multiple(mosq, mid, 1, (char *const *const)&sub, properties);
+}
+
+int mosquitto_unsubscribe_multiple(struct mosquitto *mosq, int *mid, int sub_count, char *const *const sub, const mosquitto_property *properties)
+{
+	const mosquitto_property *outgoing_properties = NULL;
+	mosquitto_property local_property;
+	int rc;
+	int i;
+	uint32_t remaining_length = 0;
+	int slen;
+
+	if(!mosq) return MOSQ_ERR_INVAL;
+	if(mosq->protocol != mosq_p_mqtt5 && properties) return MOSQ_ERR_NOT_SUPPORTED;
+	if(mosq->sock == INVALID_SOCKET) return MOSQ_ERR_NO_CONN;
+
+	if(properties){
+		if(properties->client_generated){
+			outgoing_properties = properties;
+		}else{
+			memcpy(&local_property, properties, sizeof(mosquitto_property));
+			local_property.client_generated = true;
+			local_property.next = NULL;
+			outgoing_properties = &local_property;
+		}
+		rc = mosquitto_property_check_all(CMD_UNSUBSCRIBE, outgoing_properties);
+		if(rc) return rc;
+	}
+
+	for(i=0; i<sub_count; i++){
+		if(mosquitto_sub_topic_check(sub[i])) return MOSQ_ERR_INVAL;
+		slen = strlen(sub[i]);
+		if(mosquitto_validate_utf8(sub[i], slen)) return MOSQ_ERR_MALFORMED_UTF8;
+		remaining_length += 2+slen;
+	}
+
+	if(mosq->maximum_packet_size > 0){
+		remaining_length += 2 + property__get_length_all(outgoing_properties);
+		if(packet__check_oversize(mosq, remaining_length)){
+			return MOSQ_ERR_OVERSIZE_PACKET;
+		}
+	}
+
+	return send__unsubscribe(mosq, mid, sub_count, sub, outgoing_properties);
+}
+
diff --git a/libs/libmosquitto/src/callbacks.c b/libs/libmosquitto/src/callbacks.c
new file mode 100644
index 0000000000..17f5161bff
--- /dev/null
+++ b/libs/libmosquitto/src/callbacks.c
@@ -0,0 +1,120 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+
+
+void mosquitto_connect_callback_set(struct mosquitto *mosq, void (*on_connect)(struct mosquitto *, void *, int))
+{
+	pthread_mutex_lock(&mosq->callback_mutex);
+	mosq->on_connect = on_connect;
+	pthread_mutex_unlock(&mosq->callback_mutex);
+}
+
+void mosquitto_connect_with_flags_callback_set(struct mosquitto *mosq, void (*on_connect)(struct mosquitto *, void *, int, int))
+{
+	pthread_mutex_lock(&mosq->callback_mutex);
+	mosq->on_connect_with_flags = on_connect;
+	pthread_mutex_unlock(&mosq->callback_mutex);
+}
+
+void mosquitto_connect_v5_callback_set(struct mosquitto *mosq, void (*on_connect)(struct mosquitto *, void *, int, int, const mosquitto_property *))
+{
+	pthread_mutex_lock(&mosq->callback_mutex);
+	mosq->on_connect_v5 = on_connect;
+	pthread_mutex_unlock(&mosq->callback_mutex);
+}
+
+void mosquitto_disconnect_callback_set(struct mosquitto *mosq, void (*on_disconnect)(struct mosquitto *, void *, int))
+{
+	pthread_mutex_lock(&mosq->callback_mutex);
+	mosq->on_disconnect = on_disconnect;
+	pthread_mutex_unlock(&mosq->callback_mutex);
+}
+
+void mosquitto_disconnect_v5_callback_set(struct mosquitto *mosq, void (*on_disconnect)(struct mosquitto *, void *, int, const mosquitto_property *))
+{
+	pthread_mutex_lock(&mosq->callback_mutex);
+	mosq->on_disconnect_v5 = on_disconnect;
+	pthread_mutex_unlock(&mosq->callback_mutex);
+}
+
+void mosquitto_publish_callback_set(struct mosquitto *mosq, void (*on_publish)(struct mosquitto *, void *, int))
+{
+	pthread_mutex_lock(&mosq->callback_mutex);
+	mosq->on_publish = on_publish;
+	pthread_mutex_unlock(&mosq->callback_mutex);
+}
+
+void mosquitto_publish_v5_callback_set(struct mosquitto *mosq, void (*on_publish)(struct mosquitto *, void *, int, int, const mosquitto_property *props))
+{
+	pthread_mutex_lock(&mosq->callback_mutex);
+	mosq->on_publish_v5 = on_publish;
+	pthread_mutex_unlock(&mosq->callback_mutex);
+}
+
+void mosquitto_message_callback_set(struct mosquitto *mosq, void (*on_message)(struct mosquitto *, void *, const struct mosquitto_message *))
+{
+	pthread_mutex_lock(&mosq->callback_mutex);
+	mosq->on_message = on_message;
+	pthread_mutex_unlock(&mosq->callback_mutex);
+}
+
+void mosquitto_message_v5_callback_set(struct mosquitto *mosq, void (*on_message)(struct mosquitto *, void *, const struct mosquitto_message *, const mosquitto_property *props))
+{
+	pthread_mutex_lock(&mosq->callback_mutex);
+	mosq->on_message_v5 = on_message;
+	pthread_mutex_unlock(&mosq->callback_mutex);
+}
+
+void mosquitto_subscribe_callback_set(struct mosquitto *mosq, void (*on_subscribe)(struct mosquitto *, void *, int, int, const int *))
+{
+	pthread_mutex_lock(&mosq->callback_mutex);
+	mosq->on_subscribe = on_subscribe;
+	pthread_mutex_unlock(&mosq->callback_mutex);
+}
+
+void mosquitto_subscribe_v5_callback_set(struct mosquitto *mosq, void (*on_subscribe)(struct mosquitto *, void *, int, int, const int *, const mosquitto_property *props))
+{
+	pthread_mutex_lock(&mosq->callback_mutex);
+	mosq->on_subscribe_v5 = on_subscribe;
+	pthread_mutex_unlock(&mosq->callback_mutex);
+}
+
+void mosquitto_unsubscribe_callback_set(struct mosquitto *mosq, void (*on_unsubscribe)(struct mosquitto *, void *, int))
+{
+	pthread_mutex_lock(&mosq->callback_mutex);
+	mosq->on_unsubscribe = on_unsubscribe;
+	pthread_mutex_unlock(&mosq->callback_mutex);
+}
+
+void mosquitto_unsubscribe_v5_callback_set(struct mosquitto *mosq, void (*on_unsubscribe)(struct mosquitto *, void *, int, const mosquitto_property *props))
+{
+	pthread_mutex_lock(&mosq->callback_mutex);
+	mosq->on_unsubscribe_v5 = on_unsubscribe;
+	pthread_mutex_unlock(&mosq->callback_mutex);
+}
+
+void mosquitto_log_callback_set(struct mosquitto *mosq, void (*on_log)(struct mosquitto *, void *, int, const char *))
+{
+	pthread_mutex_lock(&mosq->log_callback_mutex);
+	mosq->on_log = on_log;
+	pthread_mutex_unlock(&mosq->log_callback_mutex);
+}
+
diff --git a/libs/libmosquitto/src/connect.c b/libs/libmosquitto/src/connect.c
new file mode 100644
index 0000000000..7543d4af74
--- /dev/null
+++ b/libs/libmosquitto/src/connect.c
@@ -0,0 +1,330 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <string.h>
+
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+#include "logging_mosq.h"
+#include "messages_mosq.h"
+#include "memory_mosq.h"
+#include "packet_mosq.h"
+#include "mqtt_protocol.h"
+#include "net_mosq.h"
+#include "send_mosq.h"
+#include "socks_mosq.h"
+#include "util_mosq.h"
+
+static char alphanum[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+
+static int mosquitto__reconnect(struct mosquitto *mosq, bool blocking, const mosquitto_property *properties);
+static int mosquitto__connect_init(struct mosquitto *mosq, const char *host, int port, int keepalive, const char *bind_address);
+
+
+static int mosquitto__connect_init(struct mosquitto *mosq, const char *host, int port, int keepalive, const char *bind_address)
+{
+	int i;
+	int rc;
+
+	if(!mosq) return MOSQ_ERR_INVAL;
+	if(!host || port <= 0) return MOSQ_ERR_INVAL;
+
+	if(mosq->id == NULL && (mosq->protocol == mosq_p_mqtt31 || mosq->protocol == mosq_p_mqtt311)){
+		mosq->id = (char *)mosquitto__calloc(24, sizeof(char));
+		if(!mosq->id){
+			return MOSQ_ERR_NOMEM;
+		}
+		mosq->id[0] = 'm';
+		mosq->id[1] = 'o';
+		mosq->id[2] = 's';
+		mosq->id[3] = 'q';
+		mosq->id[4] = '/';
+
+		rc = util__random_bytes(&mosq->id[5], 18);
+		if(rc) return rc;
+
+		for(i=5; i<23; i++){
+			mosq->id[i] = alphanum[(mosq->id[i]&0x7F)%(sizeof(alphanum)-1)];
+		}
+	}
+
+	mosquitto__free(mosq->host);
+	mosq->host = mosquitto__strdup(host);
+	if(!mosq->host) return MOSQ_ERR_NOMEM;
+	mosq->port = port;
+
+	mosquitto__free(mosq->bind_address);
+	if(bind_address){
+		mosq->bind_address = mosquitto__strdup(bind_address);
+		if(!mosq->bind_address) return MOSQ_ERR_NOMEM;
+	}
+
+	mosq->keepalive = keepalive;
+	mosq->msgs_in.inflight_quota = mosq->msgs_in.inflight_maximum;
+	mosq->msgs_out.inflight_quota = mosq->msgs_out.inflight_maximum;
+
+	if(mosq->sockpairR != INVALID_SOCKET){
+		COMPAT_CLOSE(mosq->sockpairR);
+		mosq->sockpairR = INVALID_SOCKET;
+	}
+	if(mosq->sockpairW != INVALID_SOCKET){
+		COMPAT_CLOSE(mosq->sockpairW);
+		mosq->sockpairW = INVALID_SOCKET;
+	}
+
+	if(net__socketpair(&mosq->sockpairR, &mosq->sockpairW)){
+		log__printf(mosq, MOSQ_LOG_WARNING,
+				"Warning: Unable to open socket pair, outgoing publish commands may be delayed.");
+	}
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int mosquitto_connect(struct mosquitto *mosq, const char *host, int port, int keepalive)
+{
+	return mosquitto_connect_bind(mosq, host, port, keepalive, NULL);
+}
+
+
+int mosquitto_connect_bind(struct mosquitto *mosq, const char *host, int port, int keepalive, const char *bind_address)
+{
+	return mosquitto_connect_bind_v5(mosq, host, port, keepalive, bind_address, NULL);
+}
+
+int mosquitto_connect_bind_v5(struct mosquitto *mosq, const char *host, int port, int keepalive, const char *bind_address, const mosquitto_property *properties)
+{
+	int rc;
+
+	if(properties){
+		rc = mosquitto_property_check_all(CMD_CONNECT, properties);
+		if(rc) return rc;
+	}
+
+	rc = mosquitto__connect_init(mosq, host, port, keepalive, bind_address);
+	if(rc) return rc;
+
+	pthread_mutex_lock(&mosq->state_mutex);
+	mosq->state = mosq_cs_new;
+	pthread_mutex_unlock(&mosq->state_mutex);
+
+	return mosquitto__reconnect(mosq, true, properties);
+}
+
+
+int mosquitto_connect_async(struct mosquitto *mosq, const char *host, int port, int keepalive)
+{
+	return mosquitto_connect_bind_async(mosq, host, port, keepalive, NULL);
+}
+
+
+int mosquitto_connect_bind_async(struct mosquitto *mosq, const char *host, int port, int keepalive, const char *bind_address)
+{
+	int rc = mosquitto__connect_init(mosq, host, port, keepalive, bind_address);
+	if(rc) return rc;
+
+	pthread_mutex_lock(&mosq->state_mutex);
+	mosq->state = mosq_cs_connect_async;
+	pthread_mutex_unlock(&mosq->state_mutex);
+
+	return mosquitto__reconnect(mosq, false, NULL);
+}
+
+
+int mosquitto_reconnect_async(struct mosquitto *mosq)
+{
+	return mosquitto__reconnect(mosq, false, NULL);
+}
+
+
+int mosquitto_reconnect(struct mosquitto *mosq)
+{
+	return mosquitto__reconnect(mosq, true, NULL);
+}
+
+
+static int mosquitto__reconnect(struct mosquitto *mosq, bool blocking, const mosquitto_property *properties)
+{
+	const mosquitto_property *outgoing_properties = NULL;
+	mosquitto_property local_property;
+	int rc;
+	struct mosquitto__packet *packet;
+	if(!mosq) return MOSQ_ERR_INVAL;
+	if(!mosq->host || mosq->port <= 0) return MOSQ_ERR_INVAL;
+	if(mosq->protocol != mosq_p_mqtt5 && properties) return MOSQ_ERR_NOT_SUPPORTED;
+
+	if(properties){
+		if(properties->client_generated){
+			outgoing_properties = properties;
+		}else{
+			memcpy(&local_property, properties, sizeof(mosquitto_property));
+			local_property.client_generated = true;
+			local_property.next = NULL;
+			outgoing_properties = &local_property;
+		}
+		rc = mosquitto_property_check_all(CMD_CONNECT, outgoing_properties);
+		if(rc) return rc;
+	}
+
+	pthread_mutex_lock(&mosq->state_mutex);
+#ifdef WITH_SOCKS
+	if(mosq->socks5_host){
+		mosq->state = mosq_cs_socks5_new;
+	}else
+#endif
+	{
+		mosq->state = mosq_cs_new;
+	}
+	pthread_mutex_unlock(&mosq->state_mutex);
+
+	pthread_mutex_lock(&mosq->msgtime_mutex);
+	mosq->last_msg_in = mosquitto_time();
+	mosq->next_msg_out = mosq->last_msg_in + mosq->keepalive;
+	pthread_mutex_unlock(&mosq->msgtime_mutex);
+
+	mosq->ping_t = 0;
+
+	packet__cleanup(&mosq->in_packet);
+
+	pthread_mutex_lock(&mosq->current_out_packet_mutex);
+	pthread_mutex_lock(&mosq->out_packet_mutex);
+
+	if(mosq->out_packet && !mosq->current_out_packet){
+		mosq->current_out_packet = mosq->out_packet;
+		mosq->out_packet = mosq->out_packet->next;
+	}
+
+	while(mosq->current_out_packet){
+		packet = mosq->current_out_packet;
+		/* Free data and reset values */
+		mosq->current_out_packet = mosq->out_packet;
+		if(mosq->out_packet){
+			mosq->out_packet = mosq->out_packet->next;
+		}
+
+		packet__cleanup(packet);
+		mosquitto__free(packet);
+	}
+	pthread_mutex_unlock(&mosq->out_packet_mutex);
+	pthread_mutex_unlock(&mosq->current_out_packet_mutex);
+
+	message__reconnect_reset(mosq);
+
+	if(mosq->sock != INVALID_SOCKET){
+        net__socket_close(mosq); //close socket
+    }
+
+#ifdef WITH_SOCKS
+	if(mosq->socks5_host){
+		rc = net__socket_connect(mosq, mosq->socks5_host, mosq->socks5_port, mosq->bind_address, blocking);
+	}else
+#endif
+	{
+		pthread_mutex_lock(&mosq->state_mutex);
+		mosq->state = mosq_cs_connecting;
+		pthread_mutex_unlock(&mosq->state_mutex);
+		rc = net__socket_connect(mosq, mosq->host, mosq->port, mosq->bind_address, blocking);
+	}
+	if(rc>0){
+		return rc;
+	}
+
+#ifdef WITH_SOCKS
+	if(mosq->socks5_host){
+		return socks5__send(mosq);
+	}else
+#endif
+	{
+		return send__connect(mosq, mosq->keepalive, mosq->clean_start, outgoing_properties);
+	}
+}
+
+
+int mosquitto_disconnect(struct mosquitto *mosq)
+{
+	return mosquitto_disconnect_v5(mosq, 0, NULL);
+}
+
+int mosquitto_disconnect_v5(struct mosquitto *mosq, int reason_code, const mosquitto_property *properties)
+{
+	const mosquitto_property *outgoing_properties = NULL;
+	mosquitto_property local_property;
+	int rc;
+	if(!mosq) return MOSQ_ERR_INVAL;
+	if(mosq->protocol != mosq_p_mqtt5 && properties) return MOSQ_ERR_NOT_SUPPORTED;
+
+	if(properties){
+		if(properties->client_generated){
+			outgoing_properties = properties;
+		}else{
+			memcpy(&local_property, properties, sizeof(mosquitto_property));
+			local_property.client_generated = true;
+			local_property.next = NULL;
+			outgoing_properties = &local_property;
+		}
+		rc = mosquitto_property_check_all(CMD_DISCONNECT, outgoing_properties);
+		if(rc) return rc;
+	}
+
+	pthread_mutex_lock(&mosq->state_mutex);
+	mosq->state = mosq_cs_disconnecting;
+	pthread_mutex_unlock(&mosq->state_mutex);
+
+	if(mosq->sock == INVALID_SOCKET) return MOSQ_ERR_NO_CONN;
+	return send__disconnect(mosq, reason_code, outgoing_properties);
+}
+
+
+void do_client_disconnect(struct mosquitto *mosq, int reason_code, const mosquitto_property *properties)
+{
+	pthread_mutex_lock(&mosq->state_mutex);
+	mosq->state = mosq_cs_disconnecting;
+	pthread_mutex_unlock(&mosq->state_mutex);
+
+	net__socket_close(mosq);
+
+	/* Free data and reset values */
+	pthread_mutex_lock(&mosq->out_packet_mutex);
+	mosq->current_out_packet = mosq->out_packet;
+	if(mosq->out_packet){
+		mosq->out_packet = mosq->out_packet->next;
+		if(!mosq->out_packet){
+			mosq->out_packet_last = NULL;
+		}
+	}
+	pthread_mutex_unlock(&mosq->out_packet_mutex);
+
+	pthread_mutex_lock(&mosq->msgtime_mutex);
+	mosq->next_msg_out = mosquitto_time() + mosq->keepalive;
+	pthread_mutex_unlock(&mosq->msgtime_mutex);
+
+	pthread_mutex_lock(&mosq->callback_mutex);
+	if(mosq->on_disconnect){
+		mosq->in_callback = true;
+		mosq->on_disconnect(mosq, mosq->userdata, reason_code);
+		mosq->in_callback = false;
+	}
+	if(mosq->on_disconnect_v5){
+		mosq->in_callback = true;
+		mosq->on_disconnect_v5(mosq, mosq->userdata, reason_code, properties);
+		mosq->in_callback = false;
+	}
+	pthread_mutex_unlock(&mosq->callback_mutex);
+	pthread_mutex_unlock(&mosq->current_out_packet_mutex);
+}
+
diff --git a/libs/libmosquitto/src/dummypthread.h b/libs/libmosquitto/src/dummypthread.h
new file mode 100644
index 0000000000..4207f3d68c
--- /dev/null
+++ b/libs/libmosquitto/src/dummypthread.h
@@ -0,0 +1,13 @@
+#ifndef DUMMYPTHREAD_H
+#define DUMMYPTHREAD_H
+
+#define pthread_create(A, B, C, D)
+#define pthread_join(A, B)
+#define pthread_cancel(A)
+
+#define pthread_mutex_init(A, B)
+#define pthread_mutex_destroy(A)
+#define pthread_mutex_lock(A) 
+#define pthread_mutex_unlock(A) 
+
+#endif
diff --git a/libs/libmosquitto/src/handle_auth.c b/libs/libmosquitto/src/handle_auth.c
new file mode 100644
index 0000000000..5b84d3de31
--- /dev/null
+++ b/libs/libmosquitto/src/handle_auth.c
@@ -0,0 +1,49 @@
+/*
+Copyright (c) 2018 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#include "logging_mosq.h"
+#include "mosquitto_internal.h"
+#include "mqtt_protocol.h"
+#include "packet_mosq.h"
+#include "property_mosq.h"
+
+
+int handle__auth(struct mosquitto *mosq)
+{
+	int rc = 0;
+	uint8_t reason_code;
+	mosquitto_property *properties = NULL;
+
+	if(!mosq) return MOSQ_ERR_INVAL;
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s received AUTH", mosq->id);
+
+	if(mosq->protocol != mosq_p_mqtt5){
+		return MOSQ_ERR_PROTOCOL;
+	}
+
+	if(packet__read_byte(&mosq->in_packet, &reason_code)) return 1;
+
+	rc = property__read_all(CMD_AUTH, &mosq->in_packet, &properties);
+	if(rc) return rc;
+	mosquitto_property_free_all(&properties); /* FIXME - TEMPORARY UNTIL PROPERTIES PROCESSED */
+
+	return MOSQ_ERR_SUCCESS;
+}
diff --git a/libs/libmosquitto/src/handle_connack.c b/libs/libmosquitto/src/handle_connack.c
new file mode 100644
index 0000000000..19b6a66160
--- /dev/null
+++ b/libs/libmosquitto/src/handle_connack.c
@@ -0,0 +1,110 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+
+#include "mosquitto.h"
+#include "logging_mosq.h"
+#include "memory_mosq.h"
+#include "messages_mosq.h"
+#include "mqtt_protocol.h"
+#include "net_mosq.h"
+#include "packet_mosq.h"
+#include "property_mosq.h"
+#include "read_handle.h"
+
+int handle__connack(struct mosquitto *mosq)
+{
+	uint8_t connect_flags;
+	uint8_t reason_code;
+	int rc;
+	mosquitto_property *properties = NULL;
+	char *clientid = NULL;
+
+	assert(mosq);
+	rc = packet__read_byte(&mosq->in_packet, &connect_flags);
+	if(rc) return rc;
+	rc = packet__read_byte(&mosq->in_packet, &reason_code);
+	if(rc) return rc;
+
+	if(mosq->protocol == mosq_p_mqtt5){
+		rc = property__read_all(CMD_CONNACK, &mosq->in_packet, &properties);
+		if(rc) return rc;
+	}
+
+	mosquitto_property_read_string(properties, MQTT_PROP_ASSIGNED_CLIENT_IDENTIFIER, &clientid, false);
+	if(clientid){
+		if(mosq->id){
+			/* We've been sent a client identifier but already have one. This
+			 * shouldn't happen. */
+			free(clientid);
+			mosquitto_property_free_all(&properties);
+			return MOSQ_ERR_PROTOCOL;
+		}else{
+			mosq->id = clientid;
+			clientid = NULL;
+		}
+	}
+
+	mosquitto_property_read_byte(properties, MQTT_PROP_MAXIMUM_QOS, &mosq->maximum_qos, false);
+	mosquitto_property_read_int16(properties, MQTT_PROP_RECEIVE_MAXIMUM, &mosq->msgs_out.inflight_maximum, false);
+	mosquitto_property_read_int16(properties, MQTT_PROP_SERVER_KEEP_ALIVE, &mosq->keepalive, false);
+	mosquitto_property_read_int32(properties, MQTT_PROP_MAXIMUM_PACKET_SIZE, &mosq->maximum_packet_size, false);
+
+	mosq->msgs_out.inflight_quota = mosq->msgs_out.inflight_maximum;
+
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s received CONNACK (%d)", mosq->id, reason_code);
+	pthread_mutex_lock(&mosq->callback_mutex);
+	if(mosq->on_connect){
+		mosq->in_callback = true;
+		mosq->on_connect(mosq, mosq->userdata, reason_code);
+		mosq->in_callback = false;
+	}
+	if(mosq->on_connect_with_flags){
+		mosq->in_callback = true;
+		mosq->on_connect_with_flags(mosq, mosq->userdata, reason_code, connect_flags);
+		mosq->in_callback = false;
+	}
+	if(mosq->on_connect_v5){
+		mosq->in_callback = true;
+		mosq->on_connect_v5(mosq, mosq->userdata, reason_code, connect_flags, properties);
+		mosq->in_callback = false;
+	}
+	pthread_mutex_unlock(&mosq->callback_mutex);
+	mosquitto_property_free_all(&properties);
+
+	switch(reason_code){
+		case 0:
+			pthread_mutex_lock(&mosq->state_mutex);
+			if(mosq->state != mosq_cs_disconnecting){
+				mosq->state = mosq_cs_connected;
+			}
+			pthread_mutex_unlock(&mosq->state_mutex);
+			message__retry_check(mosq);
+			return MOSQ_ERR_SUCCESS;
+		case 1:
+		case 2:
+		case 3:
+		case 4:
+		case 5:
+			return MOSQ_ERR_CONN_REFUSED;
+		default:
+			return MOSQ_ERR_PROTOCOL;
+	}
+}
+
diff --git a/libs/libmosquitto/src/handle_disconnect.c b/libs/libmosquitto/src/handle_disconnect.c
new file mode 100644
index 0000000000..0ec1c8b3cb
--- /dev/null
+++ b/libs/libmosquitto/src/handle_disconnect.c
@@ -0,0 +1,62 @@
+/*
+Copyright (c) 2009-2018 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#include "logging_mosq.h"
+#include "mqtt_protocol.h"
+#include "memory_mosq.h"
+#include "net_mosq.h"
+#include "packet_mosq.h"
+#include "property_mosq.h"
+#include "send_mosq.h"
+#include "util_mosq.h"
+
+int handle__disconnect(struct mosquitto *mosq)
+{
+	int rc;
+	uint8_t reason_code;
+	mosquitto_property *properties = NULL;
+
+	if(!mosq){
+		return MOSQ_ERR_INVAL;
+	}
+
+	if(mosq->protocol != mosq_p_mqtt5){
+		return MOSQ_ERR_PROTOCOL;
+	}
+
+	rc = packet__read_byte(&mosq->in_packet, &reason_code);
+	if(rc) return rc;
+
+	if(mosq->in_packet.remaining_length > 2){
+		rc = property__read_all(CMD_DISCONNECT, &mosq->in_packet, &properties);
+		if(rc) return rc;
+		mosquitto_property_free_all(&properties);
+	}
+
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Received DISCONNECT (%d)", reason_code);
+
+	do_client_disconnect(mosq, reason_code, properties);
+
+	mosquitto_property_free_all(&properties);
+
+	return MOSQ_ERR_SUCCESS;
+}
+
diff --git a/libs/libmosquitto/src/handle_ping.c b/libs/libmosquitto/src/handle_ping.c
new file mode 100644
index 0000000000..56d89a3c3f
--- /dev/null
+++ b/libs/libmosquitto/src/handle_ping.c
@@ -0,0 +1,70 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#endif
+
+#include "mosquitto.h"
+#include "logging_mosq.h"
+#include "memory_mosq.h"
+#include "messages_mosq.h"
+#include "mqtt_protocol.h"
+#include "net_mosq.h"
+#include "packet_mosq.h"
+#include "read_handle.h"
+#include "send_mosq.h"
+#include "util_mosq.h"
+
+int handle__pingreq(struct mosquitto *mosq)
+{
+	assert(mosq);
+
+	if(mosq->state != mosq_cs_connected){
+		return MOSQ_ERR_PROTOCOL;
+	}
+
+#ifdef WITH_BROKER
+	log__printf(NULL, MOSQ_LOG_DEBUG, "Received PINGREQ from %s", mosq->id);
+#else
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s received PINGREQ", mosq->id);
+#endif
+	return send__pingresp(mosq);
+}
+
+int handle__pingresp(struct mosquitto *mosq)
+{
+	assert(mosq);
+
+	if(mosq->state != mosq_cs_connected){
+		return MOSQ_ERR_PROTOCOL;
+	}
+
+	mosq->ping_t = 0; /* No longer waiting for a PINGRESP. */
+#ifdef WITH_BROKER
+	log__printf(NULL, MOSQ_LOG_DEBUG, "Received PINGRESP from %s", mosq->id);
+#else
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s received PINGRESP", mosq->id);
+#endif
+	return MOSQ_ERR_SUCCESS;
+}
+
diff --git a/libs/libmosquitto/src/handle_pubackcomp.c b/libs/libmosquitto/src/handle_pubackcomp.c
new file mode 100644
index 0000000000..67921494e2
--- /dev/null
+++ b/libs/libmosquitto/src/handle_pubackcomp.c
@@ -0,0 +1,118 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#endif
+
+#include "mosquitto.h"
+#include "logging_mosq.h"
+#include "memory_mosq.h"
+#include "messages_mosq.h"
+#include "mqtt_protocol.h"
+#include "net_mosq.h"
+#include "packet_mosq.h"
+#include "read_handle.h"
+#include "send_mosq.h"
+#include "util_mosq.h"
+
+
+#ifdef WITH_BROKER
+int handle__pubackcomp(struct mosquitto_db *db, struct mosquitto *mosq, const char *type)
+#else
+int handle__pubackcomp(struct mosquitto *mosq, const char *type)
+#endif
+{
+	uint8_t reason_code = 0;
+	uint16_t mid;
+	int rc;
+	mosquitto_property *properties = NULL;
+	int qos;
+
+	assert(mosq);
+
+	if(mosq->state != mosq_cs_connected){
+		return MOSQ_ERR_PROTOCOL;
+	}
+
+	pthread_mutex_lock(&mosq->msgs_out.mutex);
+	util__increment_send_quota(mosq);
+	pthread_mutex_unlock(&mosq->msgs_out.mutex);
+
+	rc = packet__read_uint16(&mosq->in_packet, &mid);
+	if(rc) return rc;
+	qos = type[3] == 'A'?1:2; /* pubAck or pubComp */
+	if(mid == 0) return MOSQ_ERR_PROTOCOL;
+
+	if(mosq->protocol == mosq_p_mqtt5 && mosq->in_packet.remaining_length > 2){
+		rc = packet__read_byte(&mosq->in_packet, &reason_code);
+		if(rc) return rc;
+
+		if(mosq->in_packet.remaining_length > 3){
+			rc = property__read_all(CMD_PUBACK, &mosq->in_packet, &properties);
+			if(rc) return rc;
+		}
+	}
+
+#ifdef WITH_BROKER
+	log__printf(NULL, MOSQ_LOG_DEBUG, "Received %s from %s (Mid: %d, RC:%d)", type, mosq->id, mid, reason_code);
+
+	/* Immediately free, we don't do anything with Reason String or User Property at the moment */
+	mosquitto_property_free_all(&properties);
+
+	rc = db__message_delete_outgoing(db, mosq, mid, mosq_ms_wait_for_pubcomp, qos);
+	if(rc == MOSQ_ERR_NOT_FOUND){
+		log__printf(mosq, MOSQ_LOG_WARNING, "Warning: Received %s from %s for an unknown packet identifier %d.", type, mosq->id, mid);
+		return MOSQ_ERR_SUCCESS;
+	}else{
+		return rc;
+	}
+#else
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s received %s (Mid: %d, RC:%d)", mosq->id, type, mid, reason_code);
+
+	rc = message__delete(mosq, mid, mosq_md_out, qos);
+	if(rc){
+		return rc;
+	}else{
+		/* Only inform the client the message has been sent once. */
+		pthread_mutex_lock(&mosq->callback_mutex);
+		if(mosq->on_publish){
+			mosq->in_callback = true;
+			mosq->on_publish(mosq, mosq->userdata, mid);
+			mosq->in_callback = false;
+		}
+		if(mosq->on_publish_v5){
+			mosq->in_callback = true;
+			mosq->on_publish_v5(mosq, mosq->userdata, mid, reason_code, properties);
+			mosq->in_callback = false;
+		}
+		pthread_mutex_unlock(&mosq->callback_mutex);
+		mosquitto_property_free_all(&properties);
+	}
+	pthread_mutex_lock(&mosq->msgs_out.mutex);
+	message__release_to_inflight(mosq, mosq_md_out);
+	pthread_mutex_unlock(&mosq->msgs_out.mutex);
+
+	return MOSQ_ERR_SUCCESS;
+#endif
+}
+
diff --git a/libs/libmosquitto/src/handle_publish.c b/libs/libmosquitto/src/handle_publish.c
new file mode 100644
index 0000000000..8c93e3cefb
--- /dev/null
+++ b/libs/libmosquitto/src/handle_publish.c
@@ -0,0 +1,167 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <string.h>
+
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+#include "logging_mosq.h"
+#include "memory_mosq.h"
+#include "mqtt_protocol.h"
+#include "messages_mosq.h"
+#include "packet_mosq.h"
+#include "property_mosq.h"
+#include "send_mosq.h"
+#include "time_mosq.h"
+#include "util_mosq.h"
+
+
+int handle__publish(struct mosquitto *mosq)
+{
+	uint8_t header;
+	struct mosquitto_message_all *message;
+	int rc = 0;
+	uint16_t mid;
+	int slen;
+	mosquitto_property *properties = NULL;
+
+	assert(mosq);
+
+	if(mosq->state != mosq_cs_connected){
+		return MOSQ_ERR_PROTOCOL;
+	}
+
+	message = mosquitto__calloc(1, sizeof(struct mosquitto_message_all));
+	if(!message) return MOSQ_ERR_NOMEM;
+
+	header = mosq->in_packet.command;
+
+	message->dup = (header & 0x08)>>3;
+	message->msg.qos = (header & 0x06)>>1;
+	message->msg.retain = (header & 0x01);
+
+	rc = packet__read_string(&mosq->in_packet, &message->msg.topic, &slen);
+	if(rc){
+		message__cleanup(&message);
+		return rc;
+	}
+	if(!slen){
+		message__cleanup(&message);
+		return MOSQ_ERR_PROTOCOL;
+	}
+
+	if(message->msg.qos > 0){
+		if(mosq->protocol == mosq_p_mqtt5){
+			if(mosq->msgs_in.inflight_quota == 0){
+				message__cleanup(&message);
+				/* FIXME - should send a DISCONNECT here */
+				return MOSQ_ERR_PROTOCOL;
+			}
+		}
+
+		rc = packet__read_uint16(&mosq->in_packet, &mid);
+		if(rc){
+			message__cleanup(&message);
+			return rc;
+		}
+		if(mid == 0){
+			message__cleanup(&message);
+			return MOSQ_ERR_PROTOCOL;
+		}
+		message->msg.mid = (int)mid;
+	}
+
+	if(mosq->protocol == mosq_p_mqtt5){
+		rc = property__read_all(CMD_PUBLISH, &mosq->in_packet, &properties);
+		if(rc) return rc;
+	}
+
+	message->msg.payloadlen = mosq->in_packet.remaining_length - mosq->in_packet.pos;
+	if(message->msg.payloadlen){
+		message->msg.payload = mosquitto__calloc(message->msg.payloadlen+1, sizeof(uint8_t));
+		if(!message->msg.payload){
+			message__cleanup(&message);
+			mosquitto_property_free_all(&properties);
+			return MOSQ_ERR_NOMEM;
+		}
+		rc = packet__read_bytes(&mosq->in_packet, message->msg.payload, message->msg.payloadlen);
+		if(rc){
+			message__cleanup(&message);
+			mosquitto_property_free_all(&properties);
+			return rc;
+		}
+	}
+	log__printf(mosq, MOSQ_LOG_DEBUG,
+			"Client %s received PUBLISH (d%d, q%d, r%d, m%d, '%s', ... (%ld bytes))",
+			mosq->id, message->dup, message->msg.qos, message->msg.retain,
+			message->msg.mid, message->msg.topic,
+			(long)message->msg.payloadlen);
+
+	message->timestamp = mosquitto_time();
+	switch(message->msg.qos){
+		case 0:
+			pthread_mutex_lock(&mosq->callback_mutex);
+			if(mosq->on_message){
+				mosq->in_callback = true;
+				mosq->on_message(mosq, mosq->userdata, &message->msg);
+				mosq->in_callback = false;
+			}
+			if(mosq->on_message_v5){
+				mosq->in_callback = true;
+				mosq->on_message_v5(mosq, mosq->userdata, &message->msg, properties);
+				mosq->in_callback = false;
+			}
+			pthread_mutex_unlock(&mosq->callback_mutex);
+			message__cleanup(&message);
+			mosquitto_property_free_all(&properties);
+			return MOSQ_ERR_SUCCESS;
+		case 1:
+			util__decrement_receive_quota(mosq);
+			rc = send__puback(mosq, message->msg.mid, 0);
+			pthread_mutex_lock(&mosq->callback_mutex);
+			if(mosq->on_message){
+				mosq->in_callback = true;
+				mosq->on_message(mosq, mosq->userdata, &message->msg);
+				mosq->in_callback = false;
+			}
+			if(mosq->on_message_v5){
+				mosq->in_callback = true;
+				mosq->on_message_v5(mosq, mosq->userdata, &message->msg, properties);
+				mosq->in_callback = false;
+			}
+			pthread_mutex_unlock(&mosq->callback_mutex);
+			message__cleanup(&message);
+			mosquitto_property_free_all(&properties);
+			return rc;
+		case 2:
+			util__decrement_receive_quota(mosq);
+			rc = send__pubrec(mosq, message->msg.mid, 0);
+			pthread_mutex_lock(&mosq->msgs_in.mutex);
+			message->state = mosq_ms_wait_for_pubrel;
+			message__queue(mosq, message, mosq_md_in);
+			pthread_mutex_unlock(&mosq->msgs_in.mutex);
+			mosquitto_property_free_all(&properties);
+			return rc;
+		default:
+			message__cleanup(&message);
+			mosquitto_property_free_all(&properties);
+			return MOSQ_ERR_PROTOCOL;
+	}
+}
+
diff --git a/libs/libmosquitto/src/handle_pubrec.c b/libs/libmosquitto/src/handle_pubrec.c
new file mode 100644
index 0000000000..81f1b4962a
--- /dev/null
+++ b/libs/libmosquitto/src/handle_pubrec.c
@@ -0,0 +1,110 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#endif
+
+#include "mosquitto.h"
+#include "logging_mosq.h"
+#include "memory_mosq.h"
+#include "messages_mosq.h"
+#include "mqtt_protocol.h"
+#include "net_mosq.h"
+#include "packet_mosq.h"
+#include "read_handle.h"
+#include "send_mosq.h"
+#include "util_mosq.h"
+
+int handle__pubrec(struct mosquitto_db *db, struct mosquitto *mosq)
+{
+	uint8_t reason_code = 0;
+	uint16_t mid;
+	int rc;
+	mosquitto_property *properties = NULL;
+
+	assert(mosq);
+
+	if(mosq->state != mosq_cs_connected){
+		return MOSQ_ERR_PROTOCOL;
+	}
+
+	rc = packet__read_uint16(&mosq->in_packet, &mid);
+	if(rc) return rc;
+	if(mid == 0) return MOSQ_ERR_PROTOCOL;
+
+	if(mosq->protocol == mosq_p_mqtt5 && mosq->in_packet.remaining_length > 2){
+		rc = packet__read_byte(&mosq->in_packet, &reason_code);
+		if(rc) return rc;
+
+		if(mosq->in_packet.remaining_length > 3){
+			rc = property__read_all(CMD_PUBREC, &mosq->in_packet, &properties);
+			if(rc) return rc;
+			/* Immediately free, we don't do anything with Reason String or User Property at the moment */
+			mosquitto_property_free_all(&properties);
+		}
+	}
+
+#ifdef WITH_BROKER
+	log__printf(NULL, MOSQ_LOG_DEBUG, "Received PUBREC from %s (Mid: %d)", mosq->id, mid);
+
+	if(reason_code < 0x80){
+		rc = db__message_update_outgoing(mosq, mid, mosq_ms_wait_for_pubcomp, 2);
+	}else{
+		return db__message_delete_outgoing(db, mosq, mid, mosq_ms_wait_for_pubrec, 2);
+	}
+#else
+	UNUSED(db);
+
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s received PUBREC (Mid: %d)", mosq->id, mid);
+
+	if(reason_code < 0x80 || mosq->protocol != mosq_p_mqtt5){
+		rc = message__out_update(mosq, mid, mosq_ms_wait_for_pubcomp, 2);
+	}else{
+		if(!message__delete(mosq, mid, mosq_md_out, 2)){
+			/* Only inform the client the message has been sent once. */
+			pthread_mutex_lock(&mosq->callback_mutex);
+			if(mosq->on_publish_v5){
+				mosq->in_callback = true;
+				mosq->on_publish_v5(mosq, mosq->userdata, mid, reason_code, properties);
+				mosq->in_callback = false;
+			}
+			pthread_mutex_unlock(&mosq->callback_mutex);
+		}
+		util__increment_send_quota(mosq);
+		pthread_mutex_lock(&mosq->msgs_out.mutex);
+		message__release_to_inflight(mosq, mosq_md_out);
+		pthread_mutex_unlock(&mosq->msgs_out.mutex);
+		return MOSQ_ERR_SUCCESS;
+	}
+#endif
+	if(rc == MOSQ_ERR_NOT_FOUND){
+		log__printf(mosq, MOSQ_LOG_WARNING, "Warning: Received PUBREC from %s for an unknown packet identifier %d.", mosq->id, mid);
+	}else if(rc != MOSQ_ERR_SUCCESS){
+		return rc;
+	}
+	rc = send__pubrel(mosq, mid);
+	if(rc) return rc;
+
+	return MOSQ_ERR_SUCCESS;
+}
+
diff --git a/libs/libmosquitto/src/handle_pubrel.c b/libs/libmosquitto/src/handle_pubrel.c
new file mode 100644
index 0000000000..d4a90652d2
--- /dev/null
+++ b/libs/libmosquitto/src/handle_pubrel.c
@@ -0,0 +1,126 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#endif
+
+#include "mosquitto.h"
+#include "logging_mosq.h"
+#include "memory_mosq.h"
+#include "messages_mosq.h"
+#include "mqtt_protocol.h"
+#include "net_mosq.h"
+#include "packet_mosq.h"
+#include "read_handle.h"
+#include "send_mosq.h"
+#include "util_mosq.h"
+
+
+int handle__pubrel(struct mosquitto_db *db, struct mosquitto *mosq)
+{
+	uint8_t reason_code;
+	uint16_t mid;
+#ifndef WITH_BROKER
+	struct mosquitto_message_all *message = NULL;
+#endif
+	int rc;
+	mosquitto_property *properties = NULL;
+
+	assert(mosq);
+
+	if(mosq->state != mosq_cs_connected){
+		return MOSQ_ERR_PROTOCOL;
+	}
+
+	if(mosq->protocol != mosq_p_mqtt31){
+		if((mosq->in_packet.command&0x0F) != 0x02){
+			return MOSQ_ERR_PROTOCOL;
+		}
+	}
+	rc = packet__read_uint16(&mosq->in_packet, &mid);
+	if(rc) return rc;
+	if(mid == 0) return MOSQ_ERR_PROTOCOL;
+
+	if(mosq->protocol == mosq_p_mqtt5 && mosq->in_packet.remaining_length > 2){
+		rc = packet__read_byte(&mosq->in_packet, &reason_code);
+		if(rc) return rc;
+
+		if(mosq->in_packet.remaining_length > 3){
+			rc = property__read_all(CMD_PUBREL, &mosq->in_packet, &properties);
+			if(rc) return rc;
+		}
+	}
+
+#ifdef WITH_BROKER
+	log__printf(NULL, MOSQ_LOG_DEBUG, "Received PUBREL from %s (Mid: %d)", mosq->id, mid);
+
+	/* Immediately free, we don't do anything with Reason String or User Property at the moment */
+	mosquitto_property_free_all(&properties);
+
+	rc = db__message_release_incoming(db, mosq, mid);
+	if(rc == MOSQ_ERR_PROTOCOL){
+		return rc;
+	}else if(rc != MOSQ_ERR_SUCCESS){
+		/* Message not found. Still send a PUBCOMP anyway because this could be
+		 * due to a repeated PUBREL after a client has reconnected. */
+	}
+
+	rc = send__pubcomp(mosq, mid);
+	if(rc) return rc;
+#else
+	UNUSED(db);
+
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s received PUBREL (Mid: %d)", mosq->id, mid);
+
+	rc = send__pubcomp(mosq, mid);
+	if(rc){
+		message__remove(mosq, mid, mosq_md_in, &message, 2);
+		return rc;
+	}
+
+	rc = message__remove(mosq, mid, mosq_md_in, &message, 2);
+	if(rc){
+		return rc;
+	}else{
+		/* Only pass the message on if we have removed it from the queue - this
+		 * prevents multiple callbacks for the same message. */
+		pthread_mutex_lock(&mosq->callback_mutex);
+		if(mosq->on_message){
+			mosq->in_callback = true;
+			mosq->on_message(mosq, mosq->userdata, &message->msg);
+			mosq->in_callback = false;
+		}
+		if(mosq->on_message_v5){
+			mosq->in_callback = true;
+			mosq->on_message_v5(mosq, mosq->userdata, &message->msg, properties);
+			mosq->in_callback = false;
+		}
+		pthread_mutex_unlock(&mosq->callback_mutex);
+		mosquitto_property_free_all(&properties);
+		message__cleanup(&message);
+	}
+#endif
+
+	return MOSQ_ERR_SUCCESS;
+}
+
diff --git a/libs/libmosquitto/src/handle_suback.c b/libs/libmosquitto/src/handle_suback.c
new file mode 100644
index 0000000000..dadebcd79f
--- /dev/null
+++ b/libs/libmosquitto/src/handle_suback.c
@@ -0,0 +1,98 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#endif
+
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+#include "logging_mosq.h"
+#include "memory_mosq.h"
+#include "mqtt_protocol.h"
+#include "packet_mosq.h"
+#include "property_mosq.h"
+
+
+int handle__suback(struct mosquitto *mosq)
+{
+	uint16_t mid;
+	uint8_t qos;
+	int *granted_qos;
+	int qos_count;
+	int i = 0;
+	int rc;
+	mosquitto_property *properties = NULL;
+
+	assert(mosq);
+
+	if(mosq->state != mosq_cs_connected){
+		return MOSQ_ERR_PROTOCOL;
+	}
+
+#ifdef WITH_BROKER
+	log__printf(NULL, MOSQ_LOG_DEBUG, "Received SUBACK from %s", mosq->id);
+#else
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s received SUBACK", mosq->id);
+#endif
+	rc = packet__read_uint16(&mosq->in_packet, &mid);
+	if(rc) return rc;
+	if(mid == 0) return MOSQ_ERR_PROTOCOL;
+
+	if(mosq->protocol == mosq_p_mqtt5){
+		rc = property__read_all(CMD_SUBACK, &mosq->in_packet, &properties);
+		if(rc) return rc;
+	}
+
+	qos_count = mosq->in_packet.remaining_length - mosq->in_packet.pos;
+	granted_qos = mosquitto__malloc(qos_count*sizeof(int));
+	if(!granted_qos) return MOSQ_ERR_NOMEM;
+	while(mosq->in_packet.pos < mosq->in_packet.remaining_length){
+		rc = packet__read_byte(&mosq->in_packet, &qos);
+		if(rc){
+			mosquitto__free(granted_qos);
+			return rc;
+		}
+		granted_qos[i] = (int)qos;
+		i++;
+	}
+#ifdef WITH_BROKER
+	/* Immediately free, we don't do anything with Reason String or User Property at the moment */
+	mosquitto_property_free_all(&properties);
+#else
+	pthread_mutex_lock(&mosq->callback_mutex);
+	if(mosq->on_subscribe){
+		mosq->in_callback = true;
+		mosq->on_subscribe(mosq, mosq->userdata, mid, qos_count, granted_qos);
+		mosq->in_callback = false;
+	}
+	if(mosq->on_subscribe_v5){
+		mosq->in_callback = true;
+		mosq->on_subscribe_v5(mosq, mosq->userdata, mid, qos_count, granted_qos, properties);
+		mosq->in_callback = false;
+	}
+	pthread_mutex_unlock(&mosq->callback_mutex);
+	mosquitto_property_free_all(&properties);
+#endif
+	mosquitto__free(granted_qos);
+
+	return MOSQ_ERR_SUCCESS;
+}
+
diff --git a/libs/libmosquitto/src/handle_unsuback.c b/libs/libmosquitto/src/handle_unsuback.c
new file mode 100644
index 0000000000..3ced0e5280
--- /dev/null
+++ b/libs/libmosquitto/src/handle_unsuback.c
@@ -0,0 +1,87 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#endif
+
+#include "mosquitto.h"
+#include "logging_mosq.h"
+#include "memory_mosq.h"
+#include "messages_mosq.h"
+#include "mqtt_protocol.h"
+#include "net_mosq.h"
+#include "packet_mosq.h"
+#include "property_mosq.h"
+#include "read_handle.h"
+#include "send_mosq.h"
+#include "util_mosq.h"
+
+
+int handle__unsuback(struct mosquitto *mosq)
+{
+	uint16_t mid;
+	int rc;
+	mosquitto_property *properties = NULL;
+
+	assert(mosq);
+
+	if(mosq->state != mosq_cs_connected){
+		return MOSQ_ERR_PROTOCOL;
+	}
+
+#ifdef WITH_BROKER
+	log__printf(NULL, MOSQ_LOG_DEBUG, "Received UNSUBACK from %s", mosq->id);
+#else
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s received UNSUBACK", mosq->id);
+#endif
+	rc = packet__read_uint16(&mosq->in_packet, &mid);
+	if(rc) return rc;
+	if(mid == 0) return MOSQ_ERR_PROTOCOL;
+
+	if(mosq->protocol == mosq_p_mqtt5){
+		rc = property__read_all(CMD_UNSUBACK, &mosq->in_packet, &properties);
+		if(rc) return rc;
+	}
+
+#ifdef WITH_BROKER
+	/* Immediately free, we don't do anything with Reason String or User Property at the moment */
+	mosquitto_property_free_all(&properties);
+#else
+	pthread_mutex_lock(&mosq->callback_mutex);
+	if(mosq->on_unsubscribe){
+		mosq->in_callback = true;
+		mosq->on_unsubscribe(mosq, mosq->userdata, mid);
+		mosq->in_callback = false;
+	}
+	if(mosq->on_unsubscribe_v5){
+		mosq->in_callback = true;
+		mosq->on_unsubscribe_v5(mosq, mosq->userdata, mid, properties);
+		mosq->in_callback = false;
+	}
+	pthread_mutex_unlock(&mosq->callback_mutex);
+	mosquitto_property_free_all(&properties);
+#endif
+
+	return MOSQ_ERR_SUCCESS;
+}
+
diff --git a/libs/libmosquitto/src/helpers.c b/libs/libmosquitto/src/helpers.c
new file mode 100644
index 0000000000..0f60501edc
--- /dev/null
+++ b/libs/libmosquitto/src/helpers.c
@@ -0,0 +1,227 @@
+/*
+Copyright (c) 2016-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <errno.h>
+#include <stdbool.h>
+
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+
+struct userdata__callback {
+	const char *topic;
+	int (*callback)(struct mosquitto *, void *, const struct mosquitto_message *);
+	void *userdata;
+	int qos;
+	int rc;
+};
+
+struct userdata__simple {
+	struct mosquitto_message *messages;
+	int max_msg_count;
+	int message_count;
+	bool want_retained;
+};
+
+
+static void on_connect(struct mosquitto *mosq, void *obj, int rc)
+{
+	struct userdata__callback *userdata = obj;
+
+	UNUSED(rc);
+
+	mosquitto_subscribe(mosq, NULL, userdata->topic, userdata->qos);
+}
+
+
+static void on_message_callback(struct mosquitto *mosq, void *obj, const struct mosquitto_message *message)
+{
+	int rc;
+	struct userdata__callback *userdata = obj;
+
+	rc = userdata->callback(mosq, userdata->userdata, message);
+	if(rc){
+		mosquitto_disconnect(mosq);
+	}
+}
+
+static int on_message_simple(struct mosquitto *mosq, void *obj, const struct mosquitto_message *message)
+{
+	struct userdata__simple *userdata = obj;
+	int rc;
+
+	if(userdata->max_msg_count == 0){
+		return 0;
+	}
+
+	/* Don't process stale retained messages if 'want_retained' was false */
+	if(!userdata->want_retained && message->retain){
+		return 0;
+	}
+
+	userdata->max_msg_count--;
+
+	rc = mosquitto_message_copy(&userdata->messages[userdata->message_count], message);
+	if(rc){
+		return rc;
+	}
+	userdata->message_count++;
+	if(userdata->max_msg_count == 0){
+		mosquitto_disconnect(mosq);
+	}
+	return 0;
+}
+
+
+libmosq_EXPORT int mosquitto_subscribe_simple(
+		struct mosquitto_message **messages,
+		int msg_count,
+		bool want_retained,
+		const char *topic,
+		int qos,
+		const char *host,
+		int port,
+		const char *client_id,
+		int keepalive,
+		bool clean_session,
+		const char *username,
+		const char *password,
+		const struct libmosquitto_will *will,
+		const struct libmosquitto_tls *tls)
+{
+	struct userdata__simple userdata;
+	int rc;
+	int i;
+
+	if(!topic || msg_count < 1 || !messages){
+		return MOSQ_ERR_INVAL;
+	}
+
+	*messages = NULL;
+
+	userdata.messages = calloc(sizeof(struct mosquitto_message), msg_count);
+	if(!userdata.messages){
+		return MOSQ_ERR_NOMEM;
+	}
+	userdata.message_count = 0;
+	userdata.max_msg_count = msg_count;
+	userdata.want_retained = want_retained;
+
+	rc = mosquitto_subscribe_callback(
+			on_message_simple, &userdata,
+			topic, qos,
+			host, port,
+			client_id, keepalive, clean_session,
+			username, password,
+			will, tls);
+
+	if(!rc && userdata.max_msg_count == 0){
+		*messages = userdata.messages;
+		return MOSQ_ERR_SUCCESS;
+	}else{
+		for(i=0; i<msg_count; i++){
+			mosquitto_message_free_contents(&userdata.messages[i]);
+		}
+		free(userdata.messages);
+		userdata.messages = NULL;
+		return rc;
+	}
+}
+
+
+libmosq_EXPORT int mosquitto_subscribe_callback(
+		int (*callback)(struct mosquitto *, void *, const struct mosquitto_message *),
+		void *userdata,
+		const char *topic,
+		int qos,
+		const char *host,
+		int port,
+		const char *client_id,
+		int keepalive,
+		bool clean_session,
+		const char *username,
+		const char *password,
+		const struct libmosquitto_will *will,
+		const struct libmosquitto_tls *tls)
+{
+	struct mosquitto *mosq;
+	struct userdata__callback cb_userdata;
+	int rc;
+
+	if(!callback || !topic){
+		return MOSQ_ERR_INVAL;
+	}
+
+	cb_userdata.topic = topic;
+	cb_userdata.qos = qos;
+	cb_userdata.rc = 0;
+	cb_userdata.userdata = userdata;
+	cb_userdata.callback = callback;
+
+	mosq = mosquitto_new(client_id, clean_session, &cb_userdata);
+	if(!mosq){
+		return MOSQ_ERR_NOMEM;
+	}
+
+	if(will){
+		rc = mosquitto_will_set(mosq, will->topic, will->payloadlen, will->payload, will->qos, will->retain);
+		if(rc){
+			mosquitto_destroy(mosq);
+			return rc;
+		}
+	}
+	if(username){
+		rc = mosquitto_username_pw_set(mosq, username, password);
+		if(rc){
+			mosquitto_destroy(mosq);
+			return rc;
+		}
+	}
+	if(tls){
+		rc = mosquitto_tls_set(mosq, tls->cafile, tls->capath, tls->certfile, tls->keyfile, tls->pw_callback);
+		if(rc){
+			mosquitto_destroy(mosq);
+			return rc;
+		}
+		rc = mosquitto_tls_opts_set(mosq, tls->cert_reqs, tls->tls_version, tls->ciphers);
+		if(rc){
+			mosquitto_destroy(mosq);
+			return rc;
+		}
+	}
+
+	mosquitto_connect_callback_set(mosq, on_connect);
+	mosquitto_message_callback_set(mosq, on_message_callback);
+
+	rc = mosquitto_connect(mosq, host, port, keepalive);
+	if(rc){
+		mosquitto_destroy(mosq);
+		return rc;
+	}
+	rc = mosquitto_loop_forever(mosq, -1, 1);
+	mosquitto_destroy(mosq);
+	if(cb_userdata.rc){
+		rc = cb_userdata.rc;
+	}
+	//if(!rc && cb_userdata.max_msg_count == 0){
+		//return MOSQ_ERR_SUCCESS;
+	//}else{
+		//return rc;
+	//}
+	return MOSQ_ERR_SUCCESS;
+}
+
diff --git a/libs/libmosquitto/src/logging_mosq.c b/libs/libmosquitto/src/logging_mosq.c
new file mode 100644
index 0000000000..eab6356239
--- /dev/null
+++ b/libs/libmosquitto/src/logging_mosq.c
@@ -0,0 +1,59 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "mosquitto_internal.h"
+#include "mosquitto.h"
+#include "memory_mosq.h"
+
+int log__printf(struct mosquitto *mosq, int priority, const char *fmt, ...)
+{
+	va_list va;
+	char *s;
+	int len;
+
+	assert(mosq);
+	assert(fmt);
+
+	pthread_mutex_lock(&mosq->log_callback_mutex);
+	if(mosq->on_log){
+		len = strlen(fmt) + 500;
+		s = mosquitto__malloc(len*sizeof(char));
+		if(!s){
+			pthread_mutex_unlock(&mosq->log_callback_mutex);
+			return MOSQ_ERR_NOMEM;
+		}
+
+		va_start(va, fmt);
+		vsnprintf(s, len, fmt, va);
+		va_end(va);
+		s[len-1] = '\0'; /* Ensure string is null terminated. */
+
+		mosq->on_log(mosq, mosq->userdata, priority, s);
+
+		mosquitto__free(s);
+	}
+	pthread_mutex_unlock(&mosq->log_callback_mutex);
+
+	return MOSQ_ERR_SUCCESS;
+}
+
diff --git a/libs/libmosquitto/src/logging_mosq.h b/libs/libmosquitto/src/logging_mosq.h
new file mode 100644
index 0000000000..c3cc29d9ee
--- /dev/null
+++ b/libs/libmosquitto/src/logging_mosq.h
@@ -0,0 +1,23 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+#ifndef LOGGING_MOSQ_H
+#define LOGGING_MOSQ_H
+
+#include "mosquitto.h"
+
+int log__printf(struct mosquitto *mosq, int priority, const char *fmt, ...);
+
+#endif
diff --git a/libs/libmosquitto/src/loop.c b/libs/libmosquitto/src/loop.c
new file mode 100644
index 0000000000..2342c945aa
--- /dev/null
+++ b/libs/libmosquitto/src/loop.c
@@ -0,0 +1,390 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <errno.h>
+#ifndef WIN32
+#include <sys/select.h>
+#include <time.h>
+#endif
+
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+#include "net_mosq.h"
+#include "packet_mosq.h"
+#include "socks_mosq.h"
+#include "tls_mosq.h"
+#include "util_mosq.h"
+
+#if !defined(WIN32) && !defined(__SYMBIAN32__)
+#define HAVE_PSELECT
+#endif
+
+int mosquitto_loop(struct mosquitto *mosq, int timeout, int max_packets)
+{
+#ifdef HAVE_PSELECT
+	struct timespec local_timeout;
+#else
+	struct timeval local_timeout;
+#endif
+	fd_set readfds, writefds;
+	int fdcount;
+	int rc;
+	char pairbuf;
+	int maxfd = 0;
+	time_t now;
+
+	if(!mosq || max_packets < 1) return MOSQ_ERR_INVAL;
+#ifndef WIN32
+	if(mosq->sock >= FD_SETSIZE || mosq->sockpairR >= FD_SETSIZE){
+		return MOSQ_ERR_INVAL;
+	}
+#endif
+
+	FD_ZERO(&readfds);
+	FD_ZERO(&writefds);
+	if(mosq->sock != INVALID_SOCKET){
+		maxfd = mosq->sock;
+		FD_SET(mosq->sock, &readfds);
+		pthread_mutex_lock(&mosq->current_out_packet_mutex);
+		pthread_mutex_lock(&mosq->out_packet_mutex);
+		if(mosq->out_packet || mosq->current_out_packet){
+			FD_SET(mosq->sock, &writefds);
+		}
+#ifdef WITH_TLS
+		if(mosq->ssl){
+			if(mosq->want_write){
+				FD_SET(mosq->sock, &writefds);
+			}else if(mosq->want_connect){
+				/* Remove possible FD_SET from above, we don't want to check
+				 * for writing if we are still connecting, unless want_write is
+				 * definitely set. The presence of outgoing packets does not
+				 * matter yet. */
+				FD_CLR(mosq->sock, &writefds);
+			}
+		}
+#endif
+		pthread_mutex_unlock(&mosq->out_packet_mutex);
+		pthread_mutex_unlock(&mosq->current_out_packet_mutex);
+	}else{
+#ifdef WITH_SRV
+		if(mosq->achan){
+			pthread_mutex_lock(&mosq->state_mutex);
+			if(mosq->state == mosq_cs_connect_srv){
+				rc = ares_fds(mosq->achan, &readfds, &writefds);
+				if(rc > maxfd){
+					maxfd = rc;
+				}
+			}else{
+				pthread_mutex_unlock(&mosq->state_mutex);
+				return MOSQ_ERR_NO_CONN;
+			}
+			pthread_mutex_unlock(&mosq->state_mutex);
+		}
+#else
+		return MOSQ_ERR_NO_CONN;
+#endif
+	}
+	if(mosq->sockpairR != INVALID_SOCKET){
+		/* sockpairR is used to break out of select() before the timeout, on a
+		 * call to publish() etc. */
+		FD_SET(mosq->sockpairR, &readfds);
+		if(mosq->sockpairR > maxfd){
+			maxfd = mosq->sockpairR;
+		}
+	}
+
+	if(timeout < 0){
+		timeout = 1000;
+	}
+
+	now = mosquitto_time();
+	if(mosq->next_msg_out && now + timeout/1000 > mosq->next_msg_out){
+		timeout = (mosq->next_msg_out - now)*1000;
+	}
+
+	if(timeout < 0){
+		/* There has been a delay somewhere which means we should have already
+		 * sent a message. */
+		timeout = 0;
+	}
+
+	local_timeout.tv_sec = timeout/1000;
+#ifdef HAVE_PSELECT
+	local_timeout.tv_nsec = (timeout-local_timeout.tv_sec*1000)*1e6;
+#else
+	local_timeout.tv_usec = (timeout-local_timeout.tv_sec*1000)*1000;
+#endif
+
+#ifdef HAVE_PSELECT
+	fdcount = pselect(maxfd+1, &readfds, &writefds, NULL, &local_timeout, NULL);
+#else
+	fdcount = select(maxfd+1, &readfds, &writefds, NULL, &local_timeout);
+#endif
+	if(fdcount == -1){
+#ifdef WIN32
+		errno = WSAGetLastError();
+#endif
+		if(errno == EINTR){
+			return MOSQ_ERR_SUCCESS;
+		}else{
+			return MOSQ_ERR_ERRNO;
+		}
+	}else{
+		if(mosq->sock != INVALID_SOCKET){
+			if(FD_ISSET(mosq->sock, &readfds)){
+				rc = mosquitto_loop_read(mosq, max_packets);
+				if(rc || mosq->sock == INVALID_SOCKET){
+					return rc;
+				}
+			}
+			if(mosq->sockpairR != INVALID_SOCKET && FD_ISSET(mosq->sockpairR, &readfds)){
+#ifndef WIN32
+				if(read(mosq->sockpairR, &pairbuf, 1) == 0){
+				}
+#else
+				recv(mosq->sockpairR, &pairbuf, 1, 0);
+#endif
+				/* Fake write possible, to stimulate output write even though
+				 * we didn't ask for it, because at that point the publish or
+				 * other command wasn't present. */
+				if(mosq->sock != INVALID_SOCKET)
+					FD_SET(mosq->sock, &writefds);
+			}
+			if(mosq->sock != INVALID_SOCKET && FD_ISSET(mosq->sock, &writefds)){
+#ifdef WITH_TLS
+				if(mosq->want_connect){
+					rc = net__socket_connect_tls(mosq);
+					if(rc) return rc;
+				}else
+#endif
+				{
+					rc = mosquitto_loop_write(mosq, max_packets);
+					if(rc || mosq->sock == INVALID_SOCKET){
+						return rc;
+					}
+				}
+			}
+		}
+#ifdef WITH_SRV
+		if(mosq->achan){
+			ares_process(mosq->achan, &readfds, &writefds);
+		}
+#endif
+	}
+	return mosquitto_loop_misc(mosq);
+}
+
+
+int mosquitto_loop_forever(struct mosquitto *mosq, int timeout, int max_packets)
+{
+	int run = 1;
+	int rc;
+	unsigned int reconnects = 0;
+	unsigned long reconnect_delay;
+#ifndef WIN32
+	struct timespec req, rem;
+#endif
+
+	if(!mosq) return MOSQ_ERR_INVAL;
+
+	if(mosq->state == mosq_cs_connect_async){
+		mosquitto_reconnect(mosq);
+	}
+
+	while(run){
+		do{
+			rc = mosquitto_loop(mosq, timeout, max_packets);
+			if (reconnects !=0 && rc == MOSQ_ERR_SUCCESS){
+				reconnects = 0;
+			}
+		}while(run && rc == MOSQ_ERR_SUCCESS);
+		/* Quit after fatal errors. */
+		switch(rc){
+			case MOSQ_ERR_NOMEM:
+			case MOSQ_ERR_PROTOCOL:
+			case MOSQ_ERR_INVAL:
+			case MOSQ_ERR_NOT_FOUND:
+			case MOSQ_ERR_TLS:
+			case MOSQ_ERR_PAYLOAD_SIZE:
+			case MOSQ_ERR_NOT_SUPPORTED:
+			case MOSQ_ERR_AUTH:
+			case MOSQ_ERR_ACL_DENIED:
+			case MOSQ_ERR_UNKNOWN:
+			case MOSQ_ERR_EAI:
+			case MOSQ_ERR_PROXY:
+				return rc;
+			case MOSQ_ERR_ERRNO:
+				break;
+		}
+		if(errno == EPROTO){
+			return rc;
+		}
+		do{
+			rc = MOSQ_ERR_SUCCESS;
+			pthread_mutex_lock(&mosq->state_mutex);
+			if(mosq->state == mosq_cs_disconnecting){
+				run = 0;
+				pthread_mutex_unlock(&mosq->state_mutex);
+			}else{
+				pthread_mutex_unlock(&mosq->state_mutex);
+
+				if(mosq->reconnect_delay_max > mosq->reconnect_delay){
+					if(mosq->reconnect_exponential_backoff){
+						reconnect_delay = mosq->reconnect_delay*(reconnects+1)*(reconnects+1);
+					}else{
+						reconnect_delay = mosq->reconnect_delay*(reconnects+1);
+					}
+				}else{
+					reconnect_delay = mosq->reconnect_delay;
+				}
+
+				if(reconnect_delay > mosq->reconnect_delay_max){
+					reconnect_delay = mosq->reconnect_delay_max;
+				}else{
+					reconnects++;
+				}
+
+#ifdef WIN32
+				Sleep(reconnect_delay*1000);
+#else
+				req.tv_sec = reconnect_delay;
+				req.tv_nsec = 0;
+				while(nanosleep(&req, &rem) == -1 && errno == EINTR){
+					req = rem;
+				}
+#endif
+
+				pthread_mutex_lock(&mosq->state_mutex);
+				if(mosq->state == mosq_cs_disconnecting){
+					run = 0;
+					pthread_mutex_unlock(&mosq->state_mutex);
+				}else{
+					pthread_mutex_unlock(&mosq->state_mutex);
+					rc = mosquitto_reconnect(mosq);
+				}
+			}
+		}while(run && rc != MOSQ_ERR_SUCCESS);
+	}
+	return rc;
+}
+
+
+int mosquitto_loop_misc(struct mosquitto *mosq)
+{
+	if(!mosq) return MOSQ_ERR_INVAL;
+	if(mosq->sock == INVALID_SOCKET) return MOSQ_ERR_NO_CONN;
+
+	return mosquitto__check_keepalive(mosq);
+}
+
+
+static int mosquitto__loop_rc_handle(struct mosquitto *mosq, int rc)
+{
+	if(rc){
+		net__socket_close(mosq);
+		pthread_mutex_lock(&mosq->state_mutex);
+		if(mosq->state == mosq_cs_disconnecting){
+			rc = MOSQ_ERR_SUCCESS;
+		}
+		pthread_mutex_unlock(&mosq->state_mutex);
+		pthread_mutex_lock(&mosq->callback_mutex);
+		if(mosq->on_disconnect){
+			mosq->in_callback = true;
+			mosq->on_disconnect(mosq, mosq->userdata, rc);
+			mosq->in_callback = false;
+		}
+		if(mosq->on_disconnect_v5){
+			mosq->in_callback = true;
+			mosq->on_disconnect_v5(mosq, mosq->userdata, rc, NULL);
+			mosq->in_callback = false;
+		}
+		pthread_mutex_unlock(&mosq->callback_mutex);
+		return rc;
+	}
+	return rc;
+}
+
+
+int mosquitto_loop_read(struct mosquitto *mosq, int max_packets)
+{
+	int rc;
+	int i;
+	if(max_packets < 1) return MOSQ_ERR_INVAL;
+
+#ifdef WITH_TLS
+	if(mosq->want_connect){
+		return net__socket_connect_tls(mosq);
+	}
+#endif
+
+	pthread_mutex_lock(&mosq->msgs_out.mutex);
+	max_packets = mosq->msgs_out.queue_len;
+	pthread_mutex_unlock(&mosq->msgs_out.mutex);
+
+	pthread_mutex_lock(&mosq->msgs_in.mutex);
+	max_packets += mosq->msgs_in.queue_len;
+	pthread_mutex_unlock(&mosq->msgs_in.mutex);
+
+	if(max_packets < 1) max_packets = 1;
+	/* Queue len here tells us how many messages are awaiting processing and
+	 * have QoS > 0. We should try to deal with that many in this loop in order
+	 * to keep up. */
+	for(i=0; i<max_packets || SSL_DATA_PENDING(mosq); i++){
+#ifdef WITH_SOCKS
+		if(mosq->socks5_host){
+			rc = socks5__read(mosq);
+		}else
+#endif
+		{
+			rc = packet__read(mosq);
+		}
+		if(rc || errno == EAGAIN || errno == COMPAT_EWOULDBLOCK){
+			return mosquitto__loop_rc_handle(mosq, rc);
+		}
+	}
+	return rc;
+}
+
+
+int mosquitto_loop_write(struct mosquitto *mosq, int max_packets)
+{
+	int rc;
+	int i;
+	if(max_packets < 1) return MOSQ_ERR_INVAL;
+
+	pthread_mutex_lock(&mosq->msgs_out.mutex);
+	max_packets = mosq->msgs_out.queue_len;
+	pthread_mutex_unlock(&mosq->msgs_out.mutex);
+
+	pthread_mutex_lock(&mosq->msgs_in.mutex);
+	max_packets += mosq->msgs_in.queue_len;
+	pthread_mutex_unlock(&mosq->msgs_in.mutex);
+
+	if(max_packets < 1) max_packets = 1;
+	/* Queue len here tells us how many messages are awaiting processing and
+	 * have QoS > 0. We should try to deal with that many in this loop in order
+	 * to keep up. */
+	for(i=0; i<max_packets; i++){
+		rc = packet__write(mosq);
+		if(rc || errno == EAGAIN || errno == COMPAT_EWOULDBLOCK){
+			return mosquitto__loop_rc_handle(mosq, rc);
+		}
+	}
+	return rc;
+}
+
diff --git a/libs/libmosquitto/src/memory_mosq.c b/libs/libmosquitto/src/memory_mosq.c
new file mode 100644
index 0000000000..a9b01e5477
--- /dev/null
+++ b/libs/libmosquitto/src/memory_mosq.c
@@ -0,0 +1,160 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "memory_mosq.h"
+
+#ifdef REAL_WITH_MEMORY_TRACKING
+#  if defined(__APPLE__)
+#    include <malloc/malloc.h>
+#    define malloc_usable_size malloc_size
+#  elif defined(__FreeBSD__)
+#    include <malloc_np.h>
+#  else
+#    include <malloc.h>
+#  endif
+#endif
+
+#ifdef REAL_WITH_MEMORY_TRACKING
+static unsigned long memcount = 0;
+static unsigned long max_memcount = 0;
+#endif
+
+#ifdef WITH_BROKER
+static size_t mem_limit = 0;
+void memory__set_limit(size_t lim)
+{
+	mem_limit = lim;
+}
+#endif
+
+void *mosquitto__calloc(size_t nmemb, size_t size)
+{
+#ifdef REAL_WITH_MEMORY_TRACKING
+	if(mem_limit && memcount + size > mem_limit){
+		return NULL;
+	}
+#endif
+	void *mem = calloc(nmemb, size);
+
+#ifdef REAL_WITH_MEMORY_TRACKING
+	if(mem){
+		memcount += malloc_usable_size(mem);
+		if(memcount > max_memcount){
+			max_memcount = memcount;
+		}
+	}
+#endif
+
+	return mem;
+}
+
+void mosquitto__free(void *mem)
+{
+#ifdef REAL_WITH_MEMORY_TRACKING
+	if(!mem){
+		return;
+	}
+	memcount -= malloc_usable_size(mem);
+#endif
+	free(mem);
+}
+
+void *mosquitto__malloc(size_t size)
+{
+#ifdef REAL_WITH_MEMORY_TRACKING
+	if(mem_limit && memcount + size > mem_limit){
+		return NULL;
+	}
+#endif
+	void *mem = malloc(size);
+
+#ifdef REAL_WITH_MEMORY_TRACKING
+	if(mem){
+		memcount += malloc_usable_size(mem);
+		if(memcount > max_memcount){
+			max_memcount = memcount;
+		}
+	}
+#endif
+
+	return mem;
+}
+
+#ifdef REAL_WITH_MEMORY_TRACKING
+unsigned long mosquitto__memory_used(void)
+{
+	return memcount;
+}
+
+unsigned long mosquitto__max_memory_used(void)
+{
+	return max_memcount;
+}
+#endif
+
+void *mosquitto__realloc(void *ptr, size_t size)
+{
+#ifdef REAL_WITH_MEMORY_TRACKING
+	if(mem_limit && memcount + size > mem_limit){
+		return NULL;
+	}
+#endif
+	void *mem;
+#ifdef REAL_WITH_MEMORY_TRACKING
+	if(ptr){
+		memcount -= malloc_usable_size(ptr);
+	}
+#endif
+	mem = realloc(ptr, size);
+
+#ifdef REAL_WITH_MEMORY_TRACKING
+	if(mem){
+		memcount += malloc_usable_size(mem);
+		if(memcount > max_memcount){
+			max_memcount = memcount;
+		}
+	}
+#endif
+
+	return mem;
+}
+
+char *mosquitto__strdup(const char *s)
+{
+#ifdef REAL_WITH_MEMORY_TRACKING
+	if(mem_limit && memcount + strlen(s) > mem_limit){
+		return NULL;
+	}
+#endif
+	char *str = strdup(s);
+
+#ifdef REAL_WITH_MEMORY_TRACKING
+	if(str){
+		memcount += malloc_usable_size(str);
+		if(memcount > max_memcount){
+			max_memcount = memcount;
+		}
+	}
+#endif
+
+	return str;
+}
+
diff --git a/libs/libmosquitto/src/memory_mosq.h b/libs/libmosquitto/src/memory_mosq.h
new file mode 100644
index 0000000000..63386a2115
--- /dev/null
+++ b/libs/libmosquitto/src/memory_mosq.h
@@ -0,0 +1,41 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#ifndef MEMORY_MOSQ_H
+#define MEMORY_MOSQ_H
+
+#include <stdio.h>
+#include <sys/types.h>
+
+#if defined(WITH_MEMORY_TRACKING) && defined(WITH_BROKER) && defined(__GLIBC__)
+#define REAL_WITH_MEMORY_TRACKING
+#endif
+
+void *mosquitto__calloc(size_t nmemb, size_t size);
+void mosquitto__free(void *mem);
+void *mosquitto__malloc(size_t size);
+#ifdef REAL_WITH_MEMORY_TRACKING
+unsigned long mosquitto__memory_used(void);
+unsigned long mosquitto__max_memory_used(void);
+#endif
+void *mosquitto__realloc(void *ptr, size_t size);
+char *mosquitto__strdup(const char *s);
+
+#ifdef WITH_BROKER
+void memory__set_limit(size_t lim);
+#endif
+
+#endif
diff --git a/libs/libmosquitto/src/messages_mosq.c b/libs/libmosquitto/src/messages_mosq.c
new file mode 100644
index 0000000000..bf77f5e64b
--- /dev/null
+++ b/libs/libmosquitto/src/messages_mosq.c
@@ -0,0 +1,348 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <utlist.h>
+
+#include "mosquitto_internal.h"
+#include "mosquitto.h"
+#include "memory_mosq.h"
+#include "messages_mosq.h"
+#include "send_mosq.h"
+#include "time_mosq.h"
+#include "util_mosq.h"
+
+void message__cleanup(struct mosquitto_message_all **message)
+{
+	struct mosquitto_message_all *msg;
+
+	if(!message || !*message) return;
+
+	msg = *message;
+
+	mosquitto__free(msg->msg.topic);
+	mosquitto__free(msg->msg.payload);
+	mosquitto__free(msg);
+}
+
+void message__cleanup_all(struct mosquitto *mosq)
+{
+	struct mosquitto_message_all *tail, *tmp;
+
+	assert(mosq);
+
+	DL_FOREACH_SAFE(mosq->msgs_in.inflight, tail, tmp){
+		DL_DELETE(mosq->msgs_in.inflight, tail);
+		message__cleanup(&tail);
+	}
+	DL_FOREACH_SAFE(mosq->msgs_out.inflight, tail, tmp){
+		DL_DELETE(mosq->msgs_out.inflight, tail);
+		message__cleanup(&tail);
+	}
+}
+
+int mosquitto_message_copy(struct mosquitto_message *dst, const struct mosquitto_message *src)
+{
+	if(!dst || !src) return MOSQ_ERR_INVAL;
+
+	dst->mid = src->mid;
+	dst->topic = mosquitto__strdup(src->topic);
+	if(!dst->topic) return MOSQ_ERR_NOMEM;
+	dst->qos = src->qos;
+	dst->retain = src->retain;
+	if(src->payloadlen){
+		dst->payload = mosquitto__calloc(src->payloadlen+1, sizeof(uint8_t));
+		if(!dst->payload){
+			mosquitto__free(dst->topic);
+			return MOSQ_ERR_NOMEM;
+		}
+		memcpy(dst->payload, src->payload, src->payloadlen);
+		dst->payloadlen = src->payloadlen;
+	}else{
+		dst->payloadlen = 0;
+		dst->payload = NULL;
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+
+int message__delete(struct mosquitto *mosq, uint16_t mid, enum mosquitto_msg_direction dir, int qos)
+{
+	struct mosquitto_message_all *message;
+	int rc;
+	assert(mosq);
+
+	rc = message__remove(mosq, mid, dir, &message, qos);
+	if(rc == MOSQ_ERR_SUCCESS){
+		message__cleanup(&message);
+	}
+	return rc;
+}
+
+void mosquitto_message_free(struct mosquitto_message **message)
+{
+	struct mosquitto_message *msg;
+
+	if(!message || !*message) return;
+
+	msg = *message;
+
+	mosquitto__free(msg->topic);
+	mosquitto__free(msg->payload);
+	mosquitto__free(msg);
+}
+
+void mosquitto_message_free_contents(struct mosquitto_message *message)
+{
+	if(!message) return;
+
+	mosquitto__free(message->topic);
+	mosquitto__free(message->payload);
+}
+
+int message__queue(struct mosquitto *mosq, struct mosquitto_message_all *message, enum mosquitto_msg_direction dir)
+{
+	/* mosq->*_message_mutex should be locked before entering this function */
+	assert(mosq);
+	assert(message);
+	assert(message->msg.qos != 0);
+
+	if(dir == mosq_md_out){
+		DL_APPEND(mosq->msgs_out.inflight, message);
+		mosq->msgs_out.queue_len++;
+	}else{
+		DL_APPEND(mosq->msgs_in.inflight, message);
+		mosq->msgs_in.queue_len++;
+	}
+
+	return message__release_to_inflight(mosq, dir);
+}
+
+void message__reconnect_reset(struct mosquitto *mosq)
+{
+	struct mosquitto_message_all *message, *tmp;
+	assert(mosq);
+
+	pthread_mutex_lock(&mosq->msgs_in.mutex);
+	mosq->msgs_in.inflight_quota = mosq->msgs_in.inflight_maximum;
+	mosq->msgs_in.queue_len = 0;
+	DL_FOREACH_SAFE(mosq->msgs_in.inflight, message, tmp){
+		mosq->msgs_in.queue_len++;
+		message->timestamp = 0;
+		if(message->msg.qos != 2){
+			DL_DELETE(mosq->msgs_in.inflight, message);
+			message__cleanup(&message);
+		}else{
+			/* Message state can be preserved here because it should match
+			* whatever the client has got. */
+			util__decrement_receive_quota(mosq);
+		}
+	}
+	pthread_mutex_unlock(&mosq->msgs_in.mutex);
+
+
+	pthread_mutex_lock(&mosq->msgs_out.mutex);
+	mosq->msgs_out.inflight_quota = mosq->msgs_out.inflight_maximum;
+	mosq->msgs_out.queue_len = 0;
+	DL_FOREACH_SAFE(mosq->msgs_out.inflight, message, tmp){
+		mosq->msgs_out.queue_len++;
+
+		message->timestamp = 0;
+		if(mosq->msgs_out.inflight_quota != 0){
+			util__decrement_send_quota(mosq);
+			if(message->msg.qos == 1){
+				message->state = mosq_ms_publish_qos1;
+			}else if(message->msg.qos == 2){
+				if(message->state == mosq_ms_wait_for_pubrec){
+					message->state = mosq_ms_publish_qos2;
+				}else if(message->state == mosq_ms_wait_for_pubcomp){
+					message->state = mosq_ms_resend_pubrel;
+				}
+				/* Should be able to preserve state. */
+			}
+		}else{
+			message->state = mosq_ms_invalid;
+		}
+	}
+	pthread_mutex_unlock(&mosq->msgs_out.mutex);
+}
+
+
+int message__release_to_inflight(struct mosquitto *mosq, enum mosquitto_msg_direction dir)
+{
+	/* mosq->*_message_mutex should be locked before entering this function */
+	struct mosquitto_message_all *cur, *tmp;
+	int rc = MOSQ_ERR_SUCCESS;
+
+	if(dir == mosq_md_out){
+		DL_FOREACH_SAFE(mosq->msgs_out.inflight, cur, tmp){
+			if(mosq->msgs_out.inflight_quota > 0){
+				if(cur->msg.qos > 0 && cur->state == mosq_ms_invalid){
+					if(cur->msg.qos == 1){
+						cur->state = mosq_ms_wait_for_puback;
+					}else if(cur->msg.qos == 2){
+						cur->state = mosq_ms_wait_for_pubrec;
+					}
+					rc = send__publish(mosq, cur->msg.mid, cur->msg.topic, cur->msg.payloadlen, cur->msg.payload, cur->msg.qos, cur->msg.retain, cur->dup, NULL, NULL, 0);
+					if(rc){
+						return rc;
+					}
+					util__decrement_send_quota(mosq);
+				}
+			}else{
+				return MOSQ_ERR_SUCCESS;
+			}
+		}
+	}
+
+	return rc;
+}
+
+
+int message__remove(struct mosquitto *mosq, uint16_t mid, enum mosquitto_msg_direction dir, struct mosquitto_message_all **message, int qos)
+{
+	struct mosquitto_message_all *cur, *tmp;
+	bool found = false;
+	assert(mosq);
+	assert(message);
+
+	if(dir == mosq_md_out){
+		pthread_mutex_lock(&mosq->msgs_out.mutex);
+
+		DL_FOREACH_SAFE(mosq->msgs_out.inflight, cur, tmp){
+			if(found == false && cur->msg.mid == mid){
+				if(cur->msg.qos != qos){
+					pthread_mutex_unlock(&mosq->msgs_out.mutex);
+					return MOSQ_ERR_PROTOCOL;
+				}
+				DL_DELETE(mosq->msgs_out.inflight, cur);
+
+				*message = cur;
+				mosq->msgs_out.queue_len--;
+				found = true;
+				break;
+			}
+		}
+		pthread_mutex_unlock(&mosq->msgs_out.mutex);
+		if(found){
+			return MOSQ_ERR_SUCCESS;
+		}else{
+			return MOSQ_ERR_NOT_FOUND;
+		}
+	}else{
+		pthread_mutex_lock(&mosq->msgs_in.mutex);
+		DL_FOREACH_SAFE(mosq->msgs_in.inflight, cur, tmp){
+			if(cur->msg.mid == mid){
+				if(cur->msg.qos != qos){
+					pthread_mutex_unlock(&mosq->msgs_in.mutex);
+					return MOSQ_ERR_PROTOCOL;
+				}
+				DL_DELETE(mosq->msgs_in.inflight, cur);
+				*message = cur;
+				mosq->msgs_in.queue_len--;
+				found = true;
+				break;
+			}
+		}
+
+		pthread_mutex_unlock(&mosq->msgs_in.mutex);
+		if(found){
+			return MOSQ_ERR_SUCCESS;
+		}else{
+			return MOSQ_ERR_NOT_FOUND;
+		}
+	}
+}
+
+void message__retry_check(struct mosquitto *mosq)
+{
+	struct mosquitto_message_all *msg;
+	time_t now = mosquitto_time();
+	assert(mosq);
+
+#ifdef WITH_THREADING
+	pthread_mutex_lock(&mosq->msgs_out.mutex);
+#endif
+
+	DL_FOREACH(mosq->msgs_out.inflight, msg){
+		switch(msg->state){
+			case mosq_ms_publish_qos1:
+			case mosq_ms_publish_qos2:
+				msg->timestamp = now;
+				msg->dup = true;
+				send__publish(mosq, msg->msg.mid, msg->msg.topic, msg->msg.payloadlen, msg->msg.payload, msg->msg.qos, msg->msg.retain, msg->dup, NULL, NULL, 0);
+				break;
+			case mosq_ms_wait_for_pubrel:
+				msg->timestamp = now;
+				msg->dup = true;
+				send__pubrec(mosq, msg->msg.mid, 0);
+				break;
+			case mosq_ms_resend_pubrel:
+			case mosq_ms_wait_for_pubcomp:
+				msg->timestamp = now;
+				msg->dup = true;
+				send__pubrel(mosq, msg->msg.mid);
+				break;
+			default:
+				break;
+		}
+	}
+#ifdef WITH_THREADING
+	pthread_mutex_unlock(&mosq->msgs_out.mutex);
+#endif
+}
+
+
+void mosquitto_message_retry_set(struct mosquitto *mosq, unsigned int message_retry)
+{
+	UNUSED(mosq);
+	UNUSED(message_retry);
+}
+
+int message__out_update(struct mosquitto *mosq, uint16_t mid, enum mosquitto_msg_state state, int qos)
+{
+	struct mosquitto_message_all *message, *tmp;
+	assert(mosq);
+
+	pthread_mutex_lock(&mosq->msgs_out.mutex);
+	DL_FOREACH_SAFE(mosq->msgs_out.inflight, message, tmp){
+		if(message->msg.mid == mid){
+			if(message->msg.qos != qos){
+				pthread_mutex_unlock(&mosq->msgs_out.mutex);
+				return MOSQ_ERR_PROTOCOL;
+			}
+			message->state = state;
+			message->timestamp = mosquitto_time();
+			pthread_mutex_unlock(&mosq->msgs_out.mutex);
+			return MOSQ_ERR_SUCCESS;
+		}
+	}
+	pthread_mutex_unlock(&mosq->msgs_out.mutex);
+	return MOSQ_ERR_NOT_FOUND;
+}
+
+int mosquitto_max_inflight_messages_set(struct mosquitto *mosq, unsigned int max_inflight_messages)
+{
+	if(!mosq) return MOSQ_ERR_INVAL;
+
+	mosq->send_maximum = max_inflight_messages;
+
+	return MOSQ_ERR_SUCCESS;
+}
+
diff --git a/libs/libmosquitto/src/messages_mosq.h b/libs/libmosquitto/src/messages_mosq.h
new file mode 100644
index 0000000000..1951bfc79c
--- /dev/null
+++ b/libs/libmosquitto/src/messages_mosq.h
@@ -0,0 +1,32 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+#ifndef MESSAGES_MOSQ_H
+#define MESSAGES_MOSQ_H
+
+#include "mosquitto_internal.h"
+#include "mosquitto.h"
+
+void message__cleanup_all(struct mosquitto *mosq);
+void message__cleanup(struct mosquitto_message_all **message);
+int message__delete(struct mosquitto *mosq, uint16_t mid, enum mosquitto_msg_direction dir, int qos);
+int message__queue(struct mosquitto *mosq, struct mosquitto_message_all *message, enum mosquitto_msg_direction dir);
+void message__reconnect_reset(struct mosquitto *mosq);
+int message__release_to_inflight(struct mosquitto *mosq, enum mosquitto_msg_direction dir);
+int message__remove(struct mosquitto *mosq, uint16_t mid, enum mosquitto_msg_direction dir, struct mosquitto_message_all **message, int qos);
+void message__retry_check(struct mosquitto *mosq);
+int message__out_update(struct mosquitto *mosq, uint16_t mid, enum mosquitto_msg_state state, int qos);
+
+#endif
diff --git a/libs/libmosquitto/src/mosquitto.c b/libs/libmosquitto/src/mosquitto.c
new file mode 100644
index 0000000000..4b5768f38b
--- /dev/null
+++ b/libs/libmosquitto/src/mosquitto.c
@@ -0,0 +1,612 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <errno.h>
+#include <signal.h>
+#include <string.h>
+#ifndef WIN32
+#include <sys/time.h>
+#endif
+
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+#include "memory_mosq.h"
+#include "messages_mosq.h"
+#include "mqtt_protocol.h"
+#include "net_mosq.h"
+#include "packet_mosq.h"
+#include "will_mosq.h"
+
+
+void mosquitto__destroy(struct mosquitto *mosq);
+
+int mosquitto_lib_version(int *major, int *minor, int *revision)
+{
+	if(major) *major = LIBMOSQUITTO_MAJOR;
+	if(minor) *minor = LIBMOSQUITTO_MINOR;
+	if(revision) *revision = LIBMOSQUITTO_REVISION;
+	return LIBMOSQUITTO_VERSION_NUMBER;
+}
+
+int mosquitto_lib_init(void)
+{
+#ifdef WIN32
+	srand(GetTickCount64());
+#elif _POSIX_TIMERS>0 && defined(_POSIX_MONOTONIC_CLOCK)
+	struct timespec tp;
+
+	clock_gettime(CLOCK_MONOTONIC, &tp);
+	srand(tp.tv_nsec);
+#elif defined(__APPLE__)
+	uint64_t ticks;
+
+	ticks = mach_absolute_time();
+	srand((unsigned int)ticks);
+#else
+	struct timeval tv;
+
+	gettimeofday(&tv, NULL);
+	srand(tv.tv_sec*1000 + tv.tv_usec/1000);
+#endif
+
+	return net__init();
+}
+
+int mosquitto_lib_cleanup(void)
+{
+	net__cleanup();
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+struct mosquitto *mosquitto_new(const char *id, bool clean_start, void *userdata)
+{
+	struct mosquitto *mosq = NULL;
+	int rc;
+
+	if(clean_start == false && id == NULL){
+		errno = EINVAL;
+		return NULL;
+	}
+
+#ifndef WIN32
+	signal(SIGPIPE, SIG_IGN);
+#endif
+
+	mosq = (struct mosquitto *)mosquitto__calloc(1, sizeof(struct mosquitto));
+	if(mosq){
+		mosq->sock = INVALID_SOCKET;
+		mosq->sockpairR = INVALID_SOCKET;
+		mosq->sockpairW = INVALID_SOCKET;
+#ifdef WITH_THREADING
+		mosq->thread_id = pthread_self();
+#endif
+		rc = mosquitto_reinitialise(mosq, id, clean_start, userdata);
+		if(rc){
+			mosquitto_destroy(mosq);
+			if(rc == MOSQ_ERR_INVAL){
+				errno = EINVAL;
+			}else if(rc == MOSQ_ERR_NOMEM){
+				errno = ENOMEM;
+			}
+			return NULL;
+		}
+	}else{
+		errno = ENOMEM;
+	}
+	return mosq;
+}
+
+int mosquitto_reinitialise(struct mosquitto *mosq, const char *id, bool clean_start, void *userdata)
+{
+	if(!mosq) return MOSQ_ERR_INVAL;
+
+	if(clean_start == false && id == NULL){
+		return MOSQ_ERR_INVAL;
+	}
+
+	mosquitto__destroy(mosq);
+	memset(mosq, 0, sizeof(struct mosquitto));
+
+	if(userdata){
+		mosq->userdata = userdata;
+	}else{
+		mosq->userdata = mosq;
+	}
+	mosq->protocol = mosq_p_mqtt311;
+	mosq->sock = INVALID_SOCKET;
+	mosq->sockpairR = INVALID_SOCKET;
+	mosq->sockpairW = INVALID_SOCKET;
+	mosq->keepalive = 60;
+	mosq->clean_start = clean_start;
+	if(id){
+		if(STREMPTY(id)){
+			return MOSQ_ERR_INVAL;
+		}
+		if(mosquitto_validate_utf8(id, strlen(id))){
+			return MOSQ_ERR_MALFORMED_UTF8;
+		}
+		mosq->id = mosquitto__strdup(id);
+	}
+	mosq->in_packet.payload = NULL;
+	packet__cleanup(&mosq->in_packet);
+	mosq->out_packet = NULL;
+	mosq->current_out_packet = NULL;
+	mosq->last_msg_in = mosquitto_time();
+	mosq->next_msg_out = mosquitto_time() + mosq->keepalive;
+	mosq->ping_t = 0;
+	mosq->last_mid = 0;
+	mosq->state = mosq_cs_new;
+	mosq->maximum_qos = 2;
+	mosq->msgs_in.inflight_maximum = 20;
+	mosq->msgs_out.inflight_maximum = 20;
+	mosq->msgs_in.inflight_quota = 20;
+	mosq->msgs_out.inflight_quota = 20;
+	mosq->will = NULL;
+	mosq->on_connect = NULL;
+	mosq->on_publish = NULL;
+	mosq->on_message = NULL;
+	mosq->on_subscribe = NULL;
+	mosq->on_unsubscribe = NULL;
+	mosq->host = NULL;
+	mosq->port = 1883;
+	mosq->in_callback = false;
+	mosq->reconnect_delay = 1;
+	mosq->reconnect_delay_max = 1;
+	mosq->reconnect_exponential_backoff = false;
+	mosq->threaded = mosq_ts_none;
+#ifdef WITH_TLS
+	mosq->ssl = NULL;
+	mosq->ssl_ctx = NULL;
+	mosq->tls_cert_reqs = SSL_VERIFY_PEER;
+	mosq->tls_insecure = false;
+	mosq->want_write = false;
+	mosq->tls_ocsp_required = false;
+#endif
+#ifdef WITH_THREADING
+	pthread_mutex_init(&mosq->callback_mutex, NULL);
+	pthread_mutex_init(&mosq->log_callback_mutex, NULL);
+	pthread_mutex_init(&mosq->state_mutex, NULL);
+	pthread_mutex_init(&mosq->out_packet_mutex, NULL);
+	pthread_mutex_init(&mosq->current_out_packet_mutex, NULL);
+	pthread_mutex_init(&mosq->msgtime_mutex, NULL);
+	pthread_mutex_init(&mosq->msgs_in.mutex, NULL);
+	pthread_mutex_init(&mosq->msgs_out.mutex, NULL);
+	pthread_mutex_init(&mosq->mid_mutex, NULL);
+	mosq->thread_id = pthread_self();
+#endif
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+void mosquitto__destroy(struct mosquitto *mosq)
+{
+	struct mosquitto__packet *packet;
+	if(!mosq) return;
+
+#ifdef WITH_THREADING
+#  ifdef HAVE_PTHREAD_CANCEL
+	if(mosq->threaded == mosq_ts_self && !pthread_equal(mosq->thread_id, pthread_self())){
+		pthread_cancel(mosq->thread_id);
+		pthread_join(mosq->thread_id, NULL);
+		mosq->threaded = mosq_ts_none;
+	}
+#  endif
+
+	if(mosq->id){
+		/* If mosq->id is not NULL then the client has already been initialised
+		 * and so the mutexes need destroying. If mosq->id is NULL, the mutexes
+		 * haven't been initialised. */
+		pthread_mutex_destroy(&mosq->callback_mutex);
+		pthread_mutex_destroy(&mosq->log_callback_mutex);
+		pthread_mutex_destroy(&mosq->state_mutex);
+		pthread_mutex_destroy(&mosq->out_packet_mutex);
+		pthread_mutex_destroy(&mosq->current_out_packet_mutex);
+		pthread_mutex_destroy(&mosq->msgtime_mutex);
+		pthread_mutex_destroy(&mosq->msgs_in.mutex);
+		pthread_mutex_destroy(&mosq->msgs_out.mutex);
+		pthread_mutex_destroy(&mosq->mid_mutex);
+	}
+#endif
+	if(mosq->sock != INVALID_SOCKET){
+		net__socket_close(mosq);
+	}
+	message__cleanup_all(mosq);
+	will__clear(mosq);
+#ifdef WITH_TLS
+	if(mosq->ssl){
+		SSL_free(mosq->ssl);
+	}
+	if(mosq->ssl_ctx){
+		SSL_CTX_free(mosq->ssl_ctx);
+	}
+	mosquitto__free(mosq->tls_cafile);
+	mosquitto__free(mosq->tls_capath);
+	mosquitto__free(mosq->tls_certfile);
+	mosquitto__free(mosq->tls_keyfile);
+	if(mosq->tls_pw_callback) mosq->tls_pw_callback = NULL;
+	mosquitto__free(mosq->tls_version);
+	mosquitto__free(mosq->tls_ciphers);
+	mosquitto__free(mosq->tls_psk);
+	mosquitto__free(mosq->tls_psk_identity);
+	mosquitto__free(mosq->tls_alpn);
+#endif
+
+	mosquitto__free(mosq->address);
+	mosq->address = NULL;
+
+	mosquitto__free(mosq->id);
+	mosq->id = NULL;
+
+	mosquitto__free(mosq->username);
+	mosq->username = NULL;
+
+	mosquitto__free(mosq->password);
+	mosq->password = NULL;
+
+	mosquitto__free(mosq->host);
+	mosq->host = NULL;
+
+	mosquitto__free(mosq->bind_address);
+	mosq->bind_address = NULL;
+
+	/* Out packet cleanup */
+	if(mosq->out_packet && !mosq->current_out_packet){
+		mosq->current_out_packet = mosq->out_packet;
+		mosq->out_packet = mosq->out_packet->next;
+	}
+	while(mosq->current_out_packet){
+		packet = mosq->current_out_packet;
+		/* Free data and reset values */
+		mosq->current_out_packet = mosq->out_packet;
+		if(mosq->out_packet){
+			mosq->out_packet = mosq->out_packet->next;
+		}
+
+		packet__cleanup(packet);
+		mosquitto__free(packet);
+	}
+
+	packet__cleanup(&mosq->in_packet);
+	if(mosq->sockpairR != INVALID_SOCKET){
+		COMPAT_CLOSE(mosq->sockpairR);
+		mosq->sockpairR = INVALID_SOCKET;
+	}
+	if(mosq->sockpairW != INVALID_SOCKET){
+		COMPAT_CLOSE(mosq->sockpairW);
+		mosq->sockpairW = INVALID_SOCKET;
+	}
+}
+
+void mosquitto_destroy(struct mosquitto *mosq)
+{
+	if(!mosq) return;
+
+	mosquitto__destroy(mosq);
+	mosquitto__free(mosq);
+}
+
+int mosquitto_socket(struct mosquitto *mosq)
+{
+	if(!mosq) return INVALID_SOCKET;
+	return mosq->sock;
+}
+
+
+bool mosquitto_want_write(struct mosquitto *mosq)
+{
+	bool result = false;
+	if(mosq->out_packet || mosq->current_out_packet){
+		result = true;
+	}
+#ifdef WITH_TLS
+	if(mosq->ssl){
+		if (mosq->want_write) {
+			result = true;
+		}else if(mosq->want_connect){
+			result = false;
+		}
+	}
+#endif
+	return result;
+}
+
+
+const char *mosquitto_strerror(int mosq_errno)
+{
+	switch(mosq_errno){
+		case MOSQ_ERR_AUTH_CONTINUE:
+			return "Continue with authentication.";
+		case MOSQ_ERR_NO_SUBSCRIBERS:
+			return "No subscribers.";
+		case MOSQ_ERR_SUB_EXISTS:
+			return "Subscription already exists.";
+		case MOSQ_ERR_CONN_PENDING:
+			return "Connection pending.";
+		case MOSQ_ERR_SUCCESS:
+			return "No error.";
+		case MOSQ_ERR_NOMEM:
+			return "Out of memory.";
+		case MOSQ_ERR_PROTOCOL:
+			return "A network protocol error occurred when communicating with the broker.";
+		case MOSQ_ERR_INVAL:
+			return "Invalid function arguments provided.";
+		case MOSQ_ERR_NO_CONN:
+			return "The client is not currently connected.";
+		case MOSQ_ERR_CONN_REFUSED:
+			return "The connection was refused.";
+		case MOSQ_ERR_NOT_FOUND:
+			return "Message not found (internal error).";
+		case MOSQ_ERR_CONN_LOST:
+			return "The connection was lost.";
+		case MOSQ_ERR_TLS:
+			return "A TLS error occurred.";
+		case MOSQ_ERR_PAYLOAD_SIZE:
+			return "Payload too large.";
+		case MOSQ_ERR_NOT_SUPPORTED:
+			return "This feature is not supported.";
+		case MOSQ_ERR_AUTH:
+			return "Authorisation failed.";
+		case MOSQ_ERR_ACL_DENIED:
+			return "Access denied by ACL.";
+		case MOSQ_ERR_UNKNOWN:
+			return "Unknown error.";
+		case MOSQ_ERR_ERRNO:
+			return strerror(errno);
+		case MOSQ_ERR_EAI:
+			return "Lookup error.";
+		case MOSQ_ERR_PROXY:
+			return "Proxy error.";
+		case MOSQ_ERR_MALFORMED_UTF8:
+			return "Malformed UTF-8";
+		case MOSQ_ERR_DUPLICATE_PROPERTY:
+			return "Duplicate property in property list";
+		case MOSQ_ERR_TLS_HANDSHAKE:
+			return "TLS handshake failed.";
+		case MOSQ_ERR_QOS_NOT_SUPPORTED:
+			return "Requested QoS not supported on server.";
+		case MOSQ_ERR_OVERSIZE_PACKET:
+			return "Packet larger than supported by the server.";
+		case MOSQ_ERR_OCSP:
+			return "OCSP error.";
+		default:
+			return "Unknown error.";
+	}
+}
+
+const char *mosquitto_connack_string(int connack_code)
+{
+	switch(connack_code){
+		case 0:
+			return "Connection Accepted.";
+		case 1:
+			return "Connection Refused: unacceptable protocol version.";
+		case 2:
+			return "Connection Refused: identifier rejected.";
+		case 3:
+			return "Connection Refused: broker unavailable.";
+		case 4:
+			return "Connection Refused: bad user name or password.";
+		case 5:
+			return "Connection Refused: not authorised.";
+		default:
+			return "Connection Refused: unknown reason.";
+	}
+}
+
+const char *mosquitto_reason_string(int reason_code)
+{
+	switch(reason_code){
+		case MQTT_RC_SUCCESS:
+			return "Success";
+		case MQTT_RC_GRANTED_QOS1:
+			return "Granted QoS 1";
+		case MQTT_RC_GRANTED_QOS2:
+			return "Granted QoS 2";
+		case MQTT_RC_DISCONNECT_WITH_WILL_MSG:
+			return "Disconnect with Will Message";
+		case MQTT_RC_NO_MATCHING_SUBSCRIBERS:
+			return "No matching subscribers";
+		case MQTT_RC_NO_SUBSCRIPTION_EXISTED:
+			return "No subscription existed";
+		case MQTT_RC_CONTINUE_AUTHENTICATION:
+			return "Continue authentication";
+		case MQTT_RC_REAUTHENTICATE:
+			return "Re-authenticate";
+
+		case MQTT_RC_UNSPECIFIED:
+			return "Unspecified error";
+		case MQTT_RC_MALFORMED_PACKET:
+			return "Malformed Packet";
+		case MQTT_RC_PROTOCOL_ERROR:
+			return "Protocol Error";
+		case MQTT_RC_IMPLEMENTATION_SPECIFIC:
+			return "Implementation specific error";
+		case MQTT_RC_UNSUPPORTED_PROTOCOL_VERSION:
+			return "Unsupported Protocol Version";
+		case MQTT_RC_CLIENTID_NOT_VALID:
+			return "Client Identifier not valid";
+		case MQTT_RC_BAD_USERNAME_OR_PASSWORD:
+			return "Bad User Name or Password";
+		case MQTT_RC_NOT_AUTHORIZED:
+			return "Not authorized";
+		case MQTT_RC_SERVER_UNAVAILABLE:
+			return "Server unavailable";
+		case MQTT_RC_SERVER_BUSY:
+			return "Server busy";
+		case MQTT_RC_BANNED:
+			return "Banned";
+		case MQTT_RC_SERVER_SHUTTING_DOWN:
+			return "Server shutting down";
+		case MQTT_RC_BAD_AUTHENTICATION_METHOD:
+			return "Bad authentication method";
+		case MQTT_RC_KEEP_ALIVE_TIMEOUT:
+			return "Keep Alive timeout";
+		case MQTT_RC_SESSION_TAKEN_OVER:
+			return "Session taken over";
+		case MQTT_RC_TOPIC_FILTER_INVALID:
+			return "Topic Filter invalid";
+		case MQTT_RC_TOPIC_NAME_INVALID:
+			return "Topic Name invalid";
+		case MQTT_RC_PACKET_ID_IN_USE:
+			return "Packet Identifier in use";
+		case MQTT_RC_PACKET_ID_NOT_FOUND:
+			return "Packet Identifier not found";
+		case MQTT_RC_RECEIVE_MAXIMUM_EXCEEDED:
+			return "Receive Maximum exceeded";
+		case MQTT_RC_TOPIC_ALIAS_INVALID:
+			return "Topic Alias invalid";
+		case MQTT_RC_PACKET_TOO_LARGE:
+			return "Packet too large";
+		case MQTT_RC_MESSAGE_RATE_TOO_HIGH:
+			return "Message rate too high";
+		case MQTT_RC_QUOTA_EXCEEDED:
+			return "Quota exceeded";
+		case MQTT_RC_ADMINISTRATIVE_ACTION:
+			return "Administrative action";
+		case MQTT_RC_PAYLOAD_FORMAT_INVALID:
+			return "Payload format invalid";
+		case MQTT_RC_RETAIN_NOT_SUPPORTED:
+			return "Retain not supported";
+		case MQTT_RC_QOS_NOT_SUPPORTED:
+			return "QoS not supported";
+		case MQTT_RC_USE_ANOTHER_SERVER:
+			return "Use another server";
+		case MQTT_RC_SERVER_MOVED:
+			return "Server moved";
+		case MQTT_RC_SHARED_SUBS_NOT_SUPPORTED:
+			return "Shared Subscriptions not supported";
+		case MQTT_RC_CONNECTION_RATE_EXCEEDED:
+			return "Connection rate exceeded";
+		case MQTT_RC_MAXIMUM_CONNECT_TIME:
+			return "Maximum connect time";
+		case MQTT_RC_SUBSCRIPTION_IDS_NOT_SUPPORTED:
+			return "Subscription identifiers not supported";
+		case MQTT_RC_WILDCARD_SUBS_NOT_SUPPORTED:
+			return "Wildcard Subscriptions not supported";
+		default:
+			return "Unknown reason";
+	}
+}
+
+
+int mosquitto_string_to_command(const char *str, int *cmd)
+{
+	if(!strcasecmp(str, "connect")){
+		*cmd = CMD_CONNECT;
+	}else if(!strcasecmp(str, "connack")){
+		*cmd = CMD_CONNACK;
+	}else if(!strcasecmp(str, "publish")){
+		*cmd = CMD_PUBLISH;
+	}else if(!strcasecmp(str, "puback")){
+		*cmd = CMD_PUBACK;
+	}else if(!strcasecmp(str, "pubrec")){
+		*cmd = CMD_PUBREC;
+	}else if(!strcasecmp(str, "pubrel")){
+		*cmd = CMD_PUBREL;
+	}else if(!strcasecmp(str, "pubcomp")){
+		*cmd = CMD_PUBCOMP;
+	}else if(!strcasecmp(str, "subscribe")){
+		*cmd = CMD_SUBSCRIBE;
+	}else if(!strcasecmp(str, "unsubscribe")){
+		*cmd = CMD_UNSUBSCRIBE;
+	}else if(!strcasecmp(str, "disconnect")){
+		*cmd = CMD_DISCONNECT;
+	}else if(!strcasecmp(str, "auth")){
+		*cmd = CMD_AUTH;
+	}else if(!strcasecmp(str, "will")){
+		*cmd = CMD_WILL;
+	}else{
+		return MOSQ_ERR_INVAL;
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int mosquitto_sub_topic_tokenise(const char *subtopic, char ***topics, int *count)
+{
+	int len;
+	int hier_count = 1;
+	int start, stop;
+	int hier;
+	int tlen;
+	int i, j;
+
+	if(!subtopic || !topics || !count) return MOSQ_ERR_INVAL;
+
+	len = strlen(subtopic);
+
+	for(i=0; i<len; i++){
+		if(subtopic[i] == '/'){
+			if(i > len-1){
+				/* Separator at end of line */
+			}else{
+				hier_count++;
+			}
+		}
+	}
+
+	(*topics) = mosquitto__calloc(hier_count, sizeof(char *));
+	if(!(*topics)) return MOSQ_ERR_NOMEM;
+
+	start = 0;
+	stop = 0;
+	hier = 0;
+
+	for(i=0; i<len+1; i++){
+		if(subtopic[i] == '/' || subtopic[i] == '\0'){
+			stop = i;
+			if(start != stop){
+				tlen = stop-start + 1;
+				(*topics)[hier] = mosquitto__calloc(tlen, sizeof(char));
+				if(!(*topics)[hier]){
+					for(j=0; j<hier; j++){
+						mosquitto__free((*topics)[j]);
+					}
+					mosquitto__free((*topics));
+					return MOSQ_ERR_NOMEM;
+				}
+				for(j=start; j<stop; j++){
+					(*topics)[hier][j-start] = subtopic[j];
+				}
+			}
+			start = i+1;
+			hier++;
+		}
+	}
+
+	*count = hier_count;
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+int mosquitto_sub_topic_tokens_free(char ***topics, int count)
+{
+	int i;
+
+	if(!topics || !(*topics) || count<1) return MOSQ_ERR_INVAL;
+
+	for(i=0; i<count; i++){
+		mosquitto__free((*topics)[i]);
+	}
+	mosquitto__free(*topics);
+
+	return MOSQ_ERR_SUCCESS;
+}
+
diff --git a/libs/libmosquitto/src/mosquitto_internal.h b/libs/libmosquitto/src/mosquitto_internal.h
new file mode 100644
index 0000000000..ff656a4375
--- /dev/null
+++ b/libs/libmosquitto/src/mosquitto_internal.h
@@ -0,0 +1,358 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+   Tatsuzo Osawa - Add epoll.
+*/
+
+#ifndef MOSQUITTO_INTERNAL_H
+#define MOSQUITTO_INTERNAL_H
+
+#include "config.h"
+
+#ifdef WIN32
+#  include <winsock2.h>
+#endif
+
+#ifdef WITH_TLS
+#  include <openssl/ssl.h>
+#else
+#  include <time.h>
+#endif
+#include <stdlib.h>
+
+#if defined(WITH_THREADING) && !defined(WITH_BROKER)
+#  include <pthread.h>
+#else
+#  include <dummypthread.h>
+#endif
+
+#ifdef WITH_SRV
+#  include <ares.h>
+#endif
+
+#ifdef WIN32
+#	if _MSC_VER < 1600
+		typedef unsigned char uint8_t;
+		typedef unsigned short uint16_t;
+		typedef unsigned int uint32_t;
+		typedef unsigned long long uint64_t;
+#	else
+#		include <stdint.h>
+#	endif
+#else
+#	include <stdint.h>
+#endif
+
+#include "mosquitto.h"
+#include "time_mosq.h"
+#ifdef WITH_BROKER
+#  ifdef __linux__
+#    include <netdb.h>
+#  endif
+#  include "uthash.h"
+struct mosquitto_client_msg;
+#endif
+
+#ifdef WIN32
+typedef SOCKET mosq_sock_t;
+#else
+typedef int mosq_sock_t;
+#endif
+
+enum mosquitto_msg_direction {
+	mosq_md_in = 0,
+	mosq_md_out = 1
+};
+
+enum mosquitto_msg_state {
+	mosq_ms_invalid = 0,
+	mosq_ms_publish_qos0 = 1,
+	mosq_ms_publish_qos1 = 2,
+	mosq_ms_wait_for_puback = 3,
+	mosq_ms_publish_qos2 = 4,
+	mosq_ms_wait_for_pubrec = 5,
+	mosq_ms_resend_pubrel = 6,
+	mosq_ms_wait_for_pubrel = 7,
+	mosq_ms_resend_pubcomp = 8,
+	mosq_ms_wait_for_pubcomp = 9,
+	mosq_ms_send_pubrec = 10,
+	mosq_ms_queued = 11
+};
+
+enum mosquitto_client_state {
+	mosq_cs_new = 0,
+	mosq_cs_connected = 1,
+	mosq_cs_disconnecting = 2,
+	mosq_cs_connect_async = 3,
+	mosq_cs_connect_pending = 4,
+	mosq_cs_connect_srv = 5,
+	mosq_cs_disconnect_ws = 6,
+	mosq_cs_disconnected = 7,
+	mosq_cs_socks5_new = 8,
+	mosq_cs_socks5_start = 9,
+	mosq_cs_socks5_request = 10,
+	mosq_cs_socks5_reply = 11,
+	mosq_cs_socks5_auth_ok = 12,
+	mosq_cs_socks5_userpass_reply = 13,
+	mosq_cs_socks5_send_userpass = 14,
+	mosq_cs_expiring = 15,
+	mosq_cs_connecting = 16,
+	mosq_cs_duplicate = 17, /* client that has been taken over by another with the same id */
+	mosq_cs_disconnect_with_will = 18,
+	mosq_cs_disused = 19, /* client that has been added to the disused list to be freed */
+	mosq_cs_authenticating = 20, /* Client has sent CONNECT but is still undergoing extended authentication */
+	mosq_cs_reauthenticating = 21, /* Client is undergoing reauthentication and shouldn't do anything else until complete */
+};
+
+enum mosquitto__protocol {
+	mosq_p_invalid = 0,
+	mosq_p_mqtt31 = 1,
+	mosq_p_mqtt311 = 2,
+	mosq_p_mqtts = 3,
+	mosq_p_mqtt5 = 5,
+};
+
+enum mosquitto__threaded_state {
+	mosq_ts_none,		/* No threads in use */
+	mosq_ts_self,		/* Threads started by libmosquitto */
+	mosq_ts_external	/* Threads started by external code */
+};
+
+enum mosquitto__transport {
+	mosq_t_invalid = 0,
+	mosq_t_tcp = 1,
+	mosq_t_ws = 2,
+	mosq_t_sctp = 3
+};
+
+
+struct mosquitto__alias{
+	char *topic;
+	uint16_t alias;
+};
+
+struct session_expiry_list {
+	struct mosquitto *context;
+	struct session_expiry_list *prev;
+	struct session_expiry_list *next;
+};
+
+struct mosquitto__packet{
+	uint8_t *payload;
+	struct mosquitto__packet *next;
+	uint32_t remaining_mult;
+	uint32_t remaining_length;
+	uint32_t packet_length;
+	uint32_t to_process;
+	uint32_t pos;
+	uint16_t mid;
+	uint8_t command;
+	int8_t remaining_count;
+};
+
+struct mosquitto_message_all{
+	struct mosquitto_message_all *next;
+	struct mosquitto_message_all *prev;
+	mosquitto_property *properties;
+	time_t timestamp;
+	//enum mosquitto_msg_direction direction;
+	enum mosquitto_msg_state state;
+	bool dup;
+	struct mosquitto_message msg;
+	uint32_t expiry_interval;
+};
+
+#ifdef WITH_TLS
+enum mosquitto__keyform {
+	mosq_k_pem = 0,
+	mosq_k_engine = 1,
+};
+#endif
+
+struct will_delay_list {
+	struct mosquitto *context;
+	struct will_delay_list *prev;
+	struct will_delay_list *next;
+};
+
+struct mosquitto_msg_data{
+#ifdef WITH_BROKER
+	struct mosquitto_client_msg *inflight;
+	struct mosquitto_client_msg *queued;
+	unsigned long msg_bytes;
+	unsigned long msg_bytes12;
+	int msg_count;
+	int msg_count12;
+#else
+	struct mosquitto_message_all *inflight;
+	int queue_len;
+#  ifdef WITH_THREADING
+	pthread_mutex_t mutex;
+#  endif
+#endif
+	int inflight_quota;
+	uint16_t inflight_maximum;
+};
+
+
+struct mosquitto {
+	mosq_sock_t sock;
+#ifndef WITH_BROKER
+	mosq_sock_t sockpairR, sockpairW;
+#endif
+#if defined(__GLIBC__) && defined(WITH_ADNS)
+	struct gaicb *adns; /* For getaddrinfo_a */
+#endif
+	enum mosquitto__protocol protocol;
+	char *address;
+	char *id;
+	char *username;
+	char *password;
+	uint16_t keepalive;
+	uint16_t last_mid;
+	enum mosquitto_client_state state;
+	time_t last_msg_in;
+	time_t next_msg_out;
+	time_t ping_t;
+	struct mosquitto__packet in_packet;
+	struct mosquitto__packet *current_out_packet;
+	struct mosquitto__packet *out_packet;
+	struct mosquitto_message_all *will;
+	struct mosquitto__alias *aliases;
+	struct will_delay_list *will_delay_entry;
+	uint32_t maximum_packet_size;
+	int alias_count;
+	uint32_t will_delay_interval;
+	time_t will_delay_time;
+#ifdef WITH_TLS
+	SSL *ssl;
+	SSL_CTX *ssl_ctx;
+	char *tls_cafile;
+	char *tls_capath;
+	char *tls_certfile;
+	char *tls_keyfile;
+	int (*tls_pw_callback)(char *buf, int size, int rwflag, void *userdata);
+	char *tls_version;
+	char *tls_ciphers;
+	char *tls_psk;
+	char *tls_psk_identity;
+	int tls_cert_reqs;
+	bool tls_insecure;
+	bool ssl_ctx_defaults;
+	bool tls_ocsp_required;
+	char *tls_engine;
+	char *tls_engine_kpass_sha1;
+	enum mosquitto__keyform tls_keyform;
+	char *tls_alpn;
+#endif
+	bool want_write;
+	bool want_connect;
+#if defined(WITH_THREADING) && !defined(WITH_BROKER)
+	pthread_mutex_t callback_mutex;
+	pthread_mutex_t log_callback_mutex;
+	pthread_mutex_t msgtime_mutex;
+	pthread_mutex_t out_packet_mutex;
+	pthread_mutex_t current_out_packet_mutex;
+	pthread_mutex_t state_mutex;
+	pthread_mutex_t mid_mutex;
+	pthread_t thread_id;
+#endif
+	bool clean_start;
+	uint32_t session_expiry_interval;
+	time_t session_expiry_time;
+#ifdef WITH_BROKER
+	bool removed_from_by_id; /* True if removed from by_id hash */
+	bool is_dropping;
+	bool is_bridge;
+	struct mosquitto__bridge *bridge;
+	struct mosquitto_msg_data msgs_in;
+	struct mosquitto_msg_data msgs_out;
+	struct mosquitto__acl_user *acl_list;
+	struct mosquitto__listener *listener;
+	struct mosquitto__packet *out_packet_last;
+	struct mosquitto__subhier **subs;
+	struct mosquitto__subshared_ref **shared_subs;
+	char *auth_method;
+	int sub_count;
+	int shared_sub_count;
+	int pollfd_index;
+#  ifdef WITH_WEBSOCKETS
+#    if defined(LWS_LIBRARY_VERSION_NUMBER)
+	struct lws *wsi;
+#    else
+	struct libwebsocket_context *ws_context;
+	struct libwebsocket *wsi;
+#    endif
+#  endif
+	bool ws_want_write;
+	bool assigned_id;
+#else
+#  ifdef WITH_SOCKS
+	char *socks5_host;
+	int socks5_port;
+	char *socks5_username;
+	char *socks5_password;
+#  endif
+	void *userdata;
+	bool in_callback;
+	struct mosquitto_msg_data msgs_in;
+	struct mosquitto_msg_data msgs_out;
+	void (*on_connect)(struct mosquitto *, void *userdata, int rc);
+	void (*on_connect_with_flags)(struct mosquitto *, void *userdata, int rc, int flags);
+	void (*on_connect_v5)(struct mosquitto *, void *userdata, int rc, int flags, const mosquitto_property *props);
+	void (*on_disconnect)(struct mosquitto *, void *userdata, int rc);
+	void (*on_disconnect_v5)(struct mosquitto *, void *userdata, int rc, const mosquitto_property *props);
+	void (*on_publish)(struct mosquitto *, void *userdata, int mid);
+	void (*on_publish_v5)(struct mosquitto *, void *userdata, int mid, int reason_code, const mosquitto_property *props);
+	void (*on_message)(struct mosquitto *, void *userdata, const struct mosquitto_message *message);
+	void (*on_message_v5)(struct mosquitto *, void *userdata, const struct mosquitto_message *message, const mosquitto_property *props);
+	void (*on_subscribe)(struct mosquitto *, void *userdata, int mid, int qos_count, const int *granted_qos);
+	void (*on_subscribe_v5)(struct mosquitto *, void *userdata, int mid, int qos_count, const int *granted_qos, const mosquitto_property *props);
+	void (*on_unsubscribe)(struct mosquitto *, void *userdata, int mid);
+	void (*on_unsubscribe_v5)(struct mosquitto *, void *userdata, int mid, const mosquitto_property *props);
+	void (*on_log)(struct mosquitto *, void *userdata, int level, const char *str);
+	//void (*on_error)();
+	char *host;
+	int port;
+	char *bind_address;
+	unsigned int reconnect_delay;
+	unsigned int reconnect_delay_max;
+	bool reconnect_exponential_backoff;
+	char threaded;
+	struct mosquitto__packet *out_packet_last;
+#  ifdef WITH_SRV
+	ares_channel achan;
+#  endif
+	uint16_t send_maximum;
+	uint16_t receive_maximum;
+#endif
+	uint8_t maximum_qos;
+
+#ifdef WITH_BROKER
+	UT_hash_handle hh_id;
+	UT_hash_handle hh_sock;
+	struct mosquitto *for_free_next;
+	struct session_expiry_list *expiry_list_item;
+#endif
+#ifdef WITH_EPOLL
+	uint32_t events;
+#endif
+};
+
+#define STREMPTY(str) (str[0] == '\0')
+
+void do_client_disconnect(struct mosquitto *mosq, int reason_code, const mosquitto_property *properties);
+
+#endif
+
diff --git a/libs/libmosquitto/src/mqtt_protocol.h b/libs/libmosquitto/src/mqtt_protocol.h
new file mode 100644
index 0000000000..672d50b767
--- /dev/null
+++ b/libs/libmosquitto/src/mqtt_protocol.h
@@ -0,0 +1,158 @@
+/*
+Copyright (c) 2009-2018 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#ifndef MQTT_PROTOCOL_H
+#define MQTT_PROTOCOL_H
+
+#define PROTOCOL_NAME_v31 "MQIsdp"
+#define PROTOCOL_VERSION_v31 3
+
+#define PROTOCOL_NAME "MQTT"
+
+#define PROTOCOL_VERSION_v311 4
+#define PROTOCOL_VERSION_v5 5
+
+
+/* Message types */
+#define CMD_CONNECT 0x10
+#define CMD_CONNACK 0x20
+#define CMD_PUBLISH 0x30
+#define CMD_PUBACK 0x40
+#define CMD_PUBREC 0x50
+#define CMD_PUBREL 0x60
+#define CMD_PUBCOMP 0x70
+#define CMD_SUBSCRIBE 0x80
+#define CMD_SUBACK 0x90
+#define CMD_UNSUBSCRIBE 0xA0
+#define CMD_UNSUBACK 0xB0
+#define CMD_PINGREQ 0xC0
+#define CMD_PINGRESP 0xD0
+#define CMD_DISCONNECT 0xE0
+#define CMD_AUTH 0xF0
+
+/* Mosquitto only: for distinguishing CONNECT and WILL properties */
+#define CMD_WILL 0x100
+
+enum mqtt311_connack_codes {
+	CONNACK_ACCEPTED = 0,
+	CONNACK_REFUSED_PROTOCOL_VERSION = 1,
+	CONNACK_REFUSED_IDENTIFIER_REJECTED = 2,
+	CONNACK_REFUSED_SERVER_UNAVAILABLE = 3,
+	CONNACK_REFUSED_BAD_USERNAME_PASSWORD = 4,
+	CONNACK_REFUSED_NOT_AUTHORIZED = 5,
+};
+
+
+enum mqtt5_return_codes {
+	MQTT_RC_SUCCESS = 0,						/* CONNACK, PUBACK, PUBREC, PUBREL, PUBCOMP, UNSUBACK, AUTH */
+	MQTT_RC_NORMAL_DISCONNECTION = 0,			/* DISCONNECT */
+	MQTT_RC_GRANTED_QOS0 = 0,					/* SUBACK */
+	MQTT_RC_GRANTED_QOS1 = 1,					/* SUBACK */
+	MQTT_RC_GRANTED_QOS2 = 2,					/* SUBACK */
+	MQTT_RC_DISCONNECT_WITH_WILL_MSG = 4,		/* DISCONNECT */
+	MQTT_RC_NO_MATCHING_SUBSCRIBERS = 16,		/* PUBACK, PUBREC */
+	MQTT_RC_NO_SUBSCRIPTION_EXISTED = 17,		/* UNSUBACK */
+	MQTT_RC_CONTINUE_AUTHENTICATION = 24,		/* AUTH */
+	MQTT_RC_REAUTHENTICATE = 25,				/* AUTH */
+
+	MQTT_RC_UNSPECIFIED = 128,					/* CONNACK, PUBACK, PUBREC, SUBACK, UNSUBACK, DISCONNECT */
+	MQTT_RC_MALFORMED_PACKET = 129,				/* CONNACK, DISCONNECT */
+	MQTT_RC_PROTOCOL_ERROR = 130,				/* DISCONNECT */
+	MQTT_RC_IMPLEMENTATION_SPECIFIC = 131,		/* CONNACK, PUBACK, PUBREC, SUBACK, UNSUBACK, DISCONNECT */
+	MQTT_RC_UNSUPPORTED_PROTOCOL_VERSION = 132,	/* CONNACK */
+	MQTT_RC_CLIENTID_NOT_VALID = 133,			/* CONNACK */
+	MQTT_RC_BAD_USERNAME_OR_PASSWORD = 134,		/* CONNACK */
+	MQTT_RC_NOT_AUTHORIZED = 135,				/* CONNACK, PUBACK, PUBREC, SUBACK, UNSUBACK, DISCONNECT */
+	MQTT_RC_SERVER_UNAVAILABLE = 136,			/* CONNACK */
+	MQTT_RC_SERVER_BUSY = 137,					/* CONNACK, DISCONNECT */
+	MQTT_RC_BANNED = 138,						/* CONNACK */
+	MQTT_RC_SERVER_SHUTTING_DOWN = 139,			/* DISCONNECT */
+	MQTT_RC_BAD_AUTHENTICATION_METHOD = 140,	/* CONNACK */
+	MQTT_RC_KEEP_ALIVE_TIMEOUT = 141,			/* DISCONNECT */
+	MQTT_RC_SESSION_TAKEN_OVER = 142,			/* DISCONNECT */
+	MQTT_RC_TOPIC_FILTER_INVALID = 143,			/* SUBACK, UNSUBACK, DISCONNECT */
+	MQTT_RC_TOPIC_NAME_INVALID = 144,			/* CONNACK, PUBACK, PUBREC, DISCONNECT */
+	MQTT_RC_PACKET_ID_IN_USE = 145,				/* PUBACK, SUBACK, UNSUBACK */
+	MQTT_RC_PACKET_ID_NOT_FOUND = 146,			/* PUBREL, PUBCOMP */
+	MQTT_RC_RECEIVE_MAXIMUM_EXCEEDED = 147,		/* DISCONNECT */
+	MQTT_RC_TOPIC_ALIAS_INVALID = 148,			/* DISCONNECT */
+	MQTT_RC_PACKET_TOO_LARGE = 149,				/* CONNACK, PUBACK, PUBREC, DISCONNECT */
+	MQTT_RC_MESSAGE_RATE_TOO_HIGH = 150,		/* DISCONNECT */
+	MQTT_RC_QUOTA_EXCEEDED = 151,				/* PUBACK, PUBREC, SUBACK, DISCONNECT */
+	MQTT_RC_ADMINISTRATIVE_ACTION = 152,		/* DISCONNECT */
+	MQTT_RC_PAYLOAD_FORMAT_INVALID = 153,		/* CONNACK, DISCONNECT */
+	MQTT_RC_RETAIN_NOT_SUPPORTED = 154,			/* CONNACK, DISCONNECT */
+	MQTT_RC_QOS_NOT_SUPPORTED = 155,			/* CONNACK, DISCONNECT */
+	MQTT_RC_USE_ANOTHER_SERVER = 156,			/* CONNACK, DISCONNECT */
+	MQTT_RC_SERVER_MOVED = 157,					/* CONNACK, DISCONNECT */
+	MQTT_RC_SHARED_SUBS_NOT_SUPPORTED = 158,	/* SUBACK, DISCONNECT */
+	MQTT_RC_CONNECTION_RATE_EXCEEDED = 159,		/* CONNACK, DISCONNECT */
+	MQTT_RC_MAXIMUM_CONNECT_TIME = 160,			/* DISCONNECT */
+	MQTT_RC_SUBSCRIPTION_IDS_NOT_SUPPORTED = 161, /* SUBACK, DISCONNECT */
+	MQTT_RC_WILDCARD_SUBS_NOT_SUPPORTED = 162,	/* SUBACK, DISCONNECT */
+};
+
+enum mqtt5_property {
+	MQTT_PROP_PAYLOAD_FORMAT_INDICATOR = 1,		/* Byte :				PUBLISH, Will Properties */
+	MQTT_PROP_MESSAGE_EXPIRY_INTERVAL = 2,		/* 4 byte int :			PUBLISH, Will Properties */
+	MQTT_PROP_CONTENT_TYPE = 3,					/* UTF-8 string :		PUBLISH, Will Properties */
+	MQTT_PROP_RESPONSE_TOPIC = 8,				/* UTF-8 string :		PUBLISH, Will Properties */
+	MQTT_PROP_CORRELATION_DATA = 9,				/* Binary Data :		PUBLISH, Will Properties */
+	MQTT_PROP_SUBSCRIPTION_IDENTIFIER = 11,		/* Variable byte int :	PUBLISH, SUBSCRIBE */
+	MQTT_PROP_SESSION_EXPIRY_INTERVAL = 17,		/* 4 byte int :			CONNECT, CONNACK, DISCONNECT */
+	MQTT_PROP_ASSIGNED_CLIENT_IDENTIFIER = 18,	/* UTF-8 string :		CONNACK */
+	MQTT_PROP_SERVER_KEEP_ALIVE = 19,			/* 2 byte int :			CONNACK */
+	MQTT_PROP_AUTHENTICATION_METHOD = 21,		/* UTF-8 string :		CONNECT, CONNACK, AUTH */
+	MQTT_PROP_AUTHENTICATION_DATA = 22,			/* Binary Data :		CONNECT, CONNACK, AUTH */
+	MQTT_PROP_REQUEST_PROBLEM_INFORMATION = 23,	/* Byte :				CONNECT */
+	MQTT_PROP_WILL_DELAY_INTERVAL = 24,			/* 4 byte int :			Will properties */
+	MQTT_PROP_REQUEST_RESPONSE_INFORMATION = 25,/* Byte :				CONNECT */
+	MQTT_PROP_RESPONSE_INFORMATION = 26,		/* UTF-8 string :		CONNACK */
+	MQTT_PROP_SERVER_REFERENCE = 28,			/* UTF-8 string :		CONNACK, DISCONNECT */
+	MQTT_PROP_REASON_STRING = 31,				/* UTF-8 string :		All except Will properties */
+	MQTT_PROP_RECEIVE_MAXIMUM = 33,				/* 2 byte int :			CONNECT, CONNACK */
+	MQTT_PROP_TOPIC_ALIAS_MAXIMUM = 34,			/* 2 byte int :			CONNECT, CONNACK */
+	MQTT_PROP_TOPIC_ALIAS = 35,					/* 2 byte int :			PUBLISH */
+	MQTT_PROP_MAXIMUM_QOS = 36,					/* Byte :				CONNACK */
+	MQTT_PROP_RETAIN_AVAILABLE = 37,			/* Byte :				CONNACK */
+	MQTT_PROP_USER_PROPERTY = 38,				/* UTF-8 string pair :	All */
+	MQTT_PROP_MAXIMUM_PACKET_SIZE = 39,			/* 4 byte int :			CONNECT, CONNACK */
+	MQTT_PROP_WILDCARD_SUB_AVAILABLE = 40,		/* Byte :				CONNACK */
+	MQTT_PROP_SUBSCRIPTION_ID_AVAILABLE = 41,	/* Byte :				CONNACK */
+	MQTT_PROP_SHARED_SUB_AVAILABLE = 42,		/* Byte :				CONNACK */
+};
+
+enum mqtt5_property_type {
+	MQTT_PROP_TYPE_BYTE = 1,
+	MQTT_PROP_TYPE_INT16 = 2,
+	MQTT_PROP_TYPE_INT32 = 3,
+	MQTT_PROP_TYPE_VARINT = 4,
+	MQTT_PROP_TYPE_BINARY = 5,
+	MQTT_PROP_TYPE_STRING = 6,
+	MQTT_PROP_TYPE_STRING_PAIR = 7
+};
+
+enum mqtt5_sub_options {
+	MQTT_SUB_OPT_NO_LOCAL = 0x04,
+	MQTT_SUB_OPT_RETAIN_AS_PUBLISHED = 0x08,
+	MQTT_SUB_OPT_SEND_RETAIN_ALWAYS = 0x00,
+	MQTT_SUB_OPT_SEND_RETAIN_NEW = 0x10,
+	MQTT_SUB_OPT_SEND_RETAIN_NEVER = 0x20,
+};
+
+#define MQTT_MAX_PAYLOAD 268435455
+
+#endif
diff --git a/libs/libmosquitto/src/net_mosq.c b/libs/libmosquitto/src/net_mosq.c
new file mode 100644
index 0000000000..f207e32aea
--- /dev/null
+++ b/libs/libmosquitto/src/net_mosq.c
@@ -0,0 +1,1090 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#define _GNU_SOURCE
+#include "config.h"
+
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#ifndef WIN32
+#define _GNU_SOURCE
+#include <netdb.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#else
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#endif
+
+#ifdef __ANDROID__
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <sys/endian.h>
+#endif
+
+#ifdef HAVE_NETINET_IN_H
+#  include <netinet/in.h>
+#endif
+
+#ifdef __QNX__
+#include <net/netbyte.h>
+#endif
+
+#ifdef WITH_TLS
+#include <openssl/conf.h>
+#include <openssl/engine.h>
+#include <openssl/err.h>
+#include <openssl/ui.h>
+#include <tls_mosq.h>
+#endif
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#  ifdef WITH_WEBSOCKETS
+#    include <libwebsockets.h>
+#  endif
+#else
+#  include "read_handle.h"
+#endif
+
+#include "logging_mosq.h"
+#include "memory_mosq.h"
+#include "mqtt_protocol.h"
+#include "net_mosq.h"
+#include "time_mosq.h"
+#include "util_mosq.h"
+
+#ifdef WITH_TLS
+int tls_ex_index_mosq = -1;
+UI_METHOD *_ui_method = NULL;
+
+/* Functions taken from OpenSSL s_server/s_client */
+static int ui_open(UI *ui)
+{
+	return UI_method_get_opener(UI_OpenSSL())(ui);
+}
+
+static int ui_read(UI *ui, UI_STRING *uis)
+{
+	return UI_method_get_reader(UI_OpenSSL())(ui, uis);
+}
+
+static int ui_write(UI *ui, UI_STRING *uis)
+{
+	return UI_method_get_writer(UI_OpenSSL())(ui, uis);
+}
+
+static int ui_close(UI *ui)
+{
+	return UI_method_get_closer(UI_OpenSSL())(ui);
+}
+
+static void setup_ui_method(void)
+{
+	_ui_method = UI_create_method("OpenSSL application user interface");
+	UI_method_set_opener(_ui_method, ui_open);
+	UI_method_set_reader(_ui_method, ui_read);
+	UI_method_set_writer(_ui_method, ui_write);
+	UI_method_set_closer(_ui_method, ui_close);
+}
+
+static void cleanup_ui_method(void)
+{
+	if(_ui_method){
+		UI_destroy_method(_ui_method);
+		_ui_method = NULL;
+	}
+}
+
+UI_METHOD *net__get_ui_method(void)
+{
+	return _ui_method;
+}
+#endif
+
+int net__init(void)
+{
+#ifdef WIN32
+	WSADATA wsaData;
+	if(WSAStartup(MAKEWORD(2,2), &wsaData) != 0){
+		return MOSQ_ERR_UNKNOWN;
+	}
+#endif
+
+#ifdef WITH_SRV
+	ares_library_init(ARES_LIB_INIT_ALL);
+#endif
+
+#ifdef WITH_TLS
+#  if OPENSSL_VERSION_NUMBER < 0x10100000L
+	SSL_load_error_strings();
+	SSL_library_init();
+	OpenSSL_add_all_algorithms();
+#  else
+	OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS \
+			| OPENSSL_INIT_ADD_ALL_DIGESTS \
+			| OPENSSL_INIT_LOAD_CONFIG, NULL);
+#  endif
+#if !defined(OPENSSL_NO_ENGINE)
+	ENGINE_load_builtin_engines();
+#endif
+	setup_ui_method();
+	if(tls_ex_index_mosq == -1){
+		tls_ex_index_mosq = SSL_get_ex_new_index(0, "client context", NULL, NULL, NULL);
+	}
+#endif
+	return MOSQ_ERR_SUCCESS;
+}
+
+void net__cleanup(void)
+{
+#ifdef WITH_TLS
+#  if OPENSSL_VERSION_NUMBER < 0x10100000L
+	CRYPTO_cleanup_all_ex_data();
+	ERR_free_strings();
+	ERR_remove_thread_state(NULL);
+	EVP_cleanup();
+
+#    if !defined(OPENSSL_NO_ENGINE)
+	ENGINE_cleanup();
+#    endif
+#  endif
+
+	CONF_modules_unload(1);
+	cleanup_ui_method();
+#endif
+
+#ifdef WITH_SRV
+	ares_library_cleanup();
+#endif
+
+#ifdef WIN32
+	WSACleanup();
+#endif
+}
+
+
+/* Close a socket associated with a context and set it to -1.
+ * Returns 1 on failure (context is NULL)
+ * Returns 0 on success.
+ */
+#ifdef WITH_BROKER
+int net__socket_close(struct mosquitto_db *db, struct mosquitto *mosq)
+#else
+int net__socket_close(struct mosquitto *mosq)
+#endif
+{
+	int rc = 0;
+
+	assert(mosq);
+#ifdef WITH_TLS
+#ifdef WITH_WEBSOCKETS
+	if(!mosq->wsi)
+#endif
+	{
+		if(mosq->ssl){
+			SSL_shutdown(mosq->ssl);
+			SSL_free(mosq->ssl);
+			mosq->ssl = NULL;
+		}
+	}
+#endif
+
+#ifdef WITH_WEBSOCKETS
+	if(mosq->wsi)
+	{
+		if(mosq->state != mosq_cs_disconnecting){
+			context__set_state(mosq, mosq_cs_disconnect_ws);
+		}
+		libwebsocket_callback_on_writable(mosq->ws_context, mosq->wsi);
+	}else
+#endif
+	{
+		if(mosq->sock != INVALID_SOCKET){
+#ifdef WITH_BROKER
+			HASH_DELETE(hh_sock, db->contexts_by_sock, mosq);
+#endif
+			rc = COMPAT_CLOSE(mosq->sock);
+			mosq->sock = INVALID_SOCKET;
+		}
+	}
+
+#ifdef WITH_BROKER
+	if(mosq->listener){
+		mosq->listener->client_count--;
+	}
+#endif
+
+	return rc;
+}
+
+
+#ifdef FINAL_WITH_TLS_PSK
+static unsigned int psk_client_callback(SSL *ssl, const char *hint,
+		char *identity, unsigned int max_identity_len,
+		unsigned char *psk, unsigned int max_psk_len)
+{
+	struct mosquitto *mosq;
+	int len;
+
+	UNUSED(hint);
+
+	mosq = SSL_get_ex_data(ssl, tls_ex_index_mosq);
+	if(!mosq) return 0;
+
+	snprintf(identity, max_identity_len, "%s", mosq->tls_psk_identity);
+
+	len = mosquitto__hex2bin(mosq->tls_psk, psk, max_psk_len);
+	if (len < 0) return 0;
+	return len;
+}
+#endif
+
+#if defined(WITH_BROKER) && defined(__GLIBC__) && defined(WITH_ADNS)
+/* Async connect, part 1 (dns lookup) */
+int net__try_connect_step1(struct mosquitto *mosq, const char *host)
+{
+	int s;
+	void *sevp = NULL;
+	struct addrinfo *hints;
+
+	if(mosq->adns){
+		gai_cancel(mosq->adns);
+		mosquitto__free((struct addrinfo *)mosq->adns->ar_request);
+		mosquitto__free(mosq->adns);
+	}
+	mosq->adns = mosquitto__calloc(1, sizeof(struct gaicb));
+	if(!mosq->adns){
+		return MOSQ_ERR_NOMEM;
+	}
+
+	hints = mosquitto__calloc(1, sizeof(struct addrinfo));
+	if(!hints){
+		mosquitto__free(mosq->adns);
+		mosq->adns = NULL;
+		return MOSQ_ERR_NOMEM;
+	}
+
+	hints->ai_family = AF_UNSPEC;
+	hints->ai_socktype = SOCK_STREAM;
+
+	mosq->adns->ar_name = host;
+	mosq->adns->ar_request = hints;
+
+	s = getaddrinfo_a(GAI_NOWAIT, &mosq->adns, 1, sevp);
+	if(s){
+		errno = s;
+		if(mosq->adns){
+			mosquitto__free((struct addrinfo *)mosq->adns->ar_request);
+			mosquitto__free(mosq->adns);
+			mosq->adns = NULL;
+		}
+		return MOSQ_ERR_EAI;
+	}
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+/* Async connect part 2, the connection. */
+int net__try_connect_step2(struct mosquitto *mosq, uint16_t port, mosq_sock_t *sock)
+{
+	struct addrinfo *ainfo, *rp;
+	int rc;
+
+	ainfo = mosq->adns->ar_result;
+
+	for(rp = ainfo; rp != NULL; rp = rp->ai_next){
+		*sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+		if(*sock == INVALID_SOCKET) continue;
+
+		if(rp->ai_family == AF_INET){
+			((struct sockaddr_in *)rp->ai_addr)->sin_port = htons(port);
+		}else if(rp->ai_family == AF_INET6){
+			((struct sockaddr_in6 *)rp->ai_addr)->sin6_port = htons(port);
+		}else{
+			COMPAT_CLOSE(*sock);
+			*sock = INVALID_SOCKET;
+			continue;
+		}
+
+		/* Set non-blocking */
+		if(net__socket_nonblock(sock)){
+			continue;
+		}
+
+		rc = connect(*sock, rp->ai_addr, rp->ai_addrlen);
+#ifdef WIN32
+		errno = WSAGetLastError();
+#endif
+		if(rc == 0 || errno == EINPROGRESS || errno == COMPAT_EWOULDBLOCK){
+			if(rc < 0 && (errno == EINPROGRESS || errno == COMPAT_EWOULDBLOCK)){
+				rc = MOSQ_ERR_CONN_PENDING;
+			}
+
+			/* Set non-blocking */
+			if(net__socket_nonblock(sock)){
+				continue;
+			}
+			break;
+		}
+
+		COMPAT_CLOSE(*sock);
+		*sock = INVALID_SOCKET;
+	}
+	freeaddrinfo(mosq->adns->ar_result);
+	mosq->adns->ar_result = NULL;
+
+	mosquitto__free((struct addrinfo *)mosq->adns->ar_request);
+	mosquitto__free(mosq->adns);
+	mosq->adns = NULL;
+
+	if(!rp){
+		return MOSQ_ERR_ERRNO;
+	}
+
+	return rc;
+}
+
+#endif
+
+
+int net__try_connect(const char *host, uint16_t port, mosq_sock_t *sock, const char *bind_address, bool blocking)
+{
+	struct addrinfo hints;
+	struct addrinfo *ainfo, *rp;
+	struct addrinfo *ainfo_bind, *rp_bind;
+	int s;
+	int rc = MOSQ_ERR_SUCCESS;
+#ifdef WIN32
+	uint32_t val = 1;
+#endif
+
+	*sock = INVALID_SOCKET;
+	memset(&hints, 0, sizeof(struct addrinfo));
+	hints.ai_family = AF_UNSPEC;
+	hints.ai_socktype = SOCK_STREAM;
+
+	s = getaddrinfo(host, NULL, &hints, &ainfo);
+	if(s){
+		errno = s;
+		return MOSQ_ERR_EAI;
+	}
+
+	if(bind_address){
+		s = getaddrinfo(bind_address, NULL, &hints, &ainfo_bind);
+		if(s){
+			freeaddrinfo(ainfo);
+			errno = s;
+			return MOSQ_ERR_EAI;
+		}
+	}
+
+	for(rp = ainfo; rp != NULL; rp = rp->ai_next){
+		*sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+		if(*sock == INVALID_SOCKET) continue;
+
+		if(rp->ai_family == AF_INET){
+			((struct sockaddr_in *)rp->ai_addr)->sin_port = htons(port);
+		}else if(rp->ai_family == AF_INET6){
+			((struct sockaddr_in6 *)rp->ai_addr)->sin6_port = htons(port);
+		}else{
+			COMPAT_CLOSE(*sock);
+			*sock = INVALID_SOCKET;
+			continue;
+		}
+
+		if(bind_address){
+			for(rp_bind = ainfo_bind; rp_bind != NULL; rp_bind = rp_bind->ai_next){
+				if(bind(*sock, rp_bind->ai_addr, rp_bind->ai_addrlen) == 0){
+					break;
+				}
+			}
+			if(!rp_bind){
+				COMPAT_CLOSE(*sock);
+				*sock = INVALID_SOCKET;
+				continue;
+			}
+		}
+
+		if(!blocking){
+			/* Set non-blocking */
+			if(net__socket_nonblock(sock)){
+				continue;
+			}
+		}
+
+		rc = connect(*sock, rp->ai_addr, rp->ai_addrlen);
+#ifdef WIN32
+		errno = WSAGetLastError();
+#endif
+		if(rc == 0 || errno == EINPROGRESS || errno == COMPAT_EWOULDBLOCK){
+			if(rc < 0 && (errno == EINPROGRESS || errno == COMPAT_EWOULDBLOCK)){
+				rc = MOSQ_ERR_CONN_PENDING;
+			}
+
+			if(blocking){
+				/* Set non-blocking */
+				if(net__socket_nonblock(sock)){
+					continue;
+				}
+			}
+			break;
+		}
+
+		COMPAT_CLOSE(*sock);
+		*sock = INVALID_SOCKET;
+	}
+	freeaddrinfo(ainfo);
+	if(bind_address){
+		freeaddrinfo(ainfo_bind);
+	}
+	if(!rp){
+		return MOSQ_ERR_ERRNO;
+	}
+	return rc;
+}
+
+
+#ifdef WITH_TLS
+void net__print_ssl_error(struct mosquitto *mosq)
+{
+	char ebuf[256];
+	unsigned long e;
+
+	e = ERR_get_error();
+	while(e){
+		log__printf(mosq, MOSQ_LOG_ERR, "OpenSSL Error: %s", ERR_error_string(e, ebuf));
+		e = ERR_get_error();
+	}
+}
+
+
+int net__socket_connect_tls(struct mosquitto *mosq)
+{
+	int ret, err;
+
+	ERR_clear_error();
+	long res;
+	if (mosq->tls_ocsp_required) {
+		// Note: OCSP is available in all currently supported OpenSSL versions.
+		if ((res=SSL_set_tlsext_status_type(mosq->ssl, TLSEXT_STATUSTYPE_ocsp)) != 1) {
+			log__printf(mosq, MOSQ_LOG_ERR, "Could not activate OCSP (error: %ld)", res);
+			return MOSQ_ERR_OCSP;
+		}
+		if ((res=SSL_CTX_set_tlsext_status_cb(mosq->ssl_ctx, mosquitto__verify_ocsp_status_cb)) != 1) {
+			log__printf(mosq, MOSQ_LOG_ERR, "Could not activate OCSP (error: %ld)", res);
+			return MOSQ_ERR_OCSP;
+		}
+		if ((res=SSL_CTX_set_tlsext_status_arg(mosq->ssl_ctx, mosq)) != 1) {
+			log__printf(mosq, MOSQ_LOG_ERR, "Could not activate OCSP (error: %ld)", res);
+			return MOSQ_ERR_OCSP;
+		}
+	}
+
+	ret = SSL_connect(mosq->ssl);
+	if(ret != 1) {
+		err = SSL_get_error(mosq->ssl, ret);
+		if (err == SSL_ERROR_SYSCALL) {
+			mosq->want_connect = true;
+			return MOSQ_ERR_SUCCESS;
+		}
+		if(err == SSL_ERROR_WANT_READ){
+			mosq->want_connect = true;
+			/* We always try to read anyway */
+		}else if(err == SSL_ERROR_WANT_WRITE){
+			mosq->want_write = true;
+			mosq->want_connect = true;
+		}else{
+			net__print_ssl_error(mosq);
+
+			COMPAT_CLOSE(mosq->sock);
+			mosq->sock = INVALID_SOCKET;
+			net__print_ssl_error(mosq);
+			return MOSQ_ERR_TLS;
+		}
+	}else{
+		mosq->want_connect = false;
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+#endif
+
+
+#ifdef WITH_TLS
+static int net__init_ssl_ctx(struct mosquitto *mosq)
+{
+	int ret;
+	ENGINE *engine = NULL;
+	uint8_t tls_alpn_wire[256];
+	uint8_t tls_alpn_len;
+
+	if(mosq->ssl_ctx){
+		if(!mosq->ssl_ctx_defaults){
+			return MOSQ_ERR_SUCCESS;
+		}else if(!mosq->tls_cafile && !mosq->tls_capath && !mosq->tls_psk){
+			log__printf(mosq, MOSQ_LOG_ERR, "Error: MOSQ_OPT_SSL_CTX_WITH_DEFAULTS used without specifying cafile, capath or psk.");
+			return MOSQ_ERR_INVAL;
+		}
+	}
+
+	/* Apply default SSL_CTX settings. This is only used if MOSQ_OPT_SSL_CTX
+	 * has not been set, or if both of MOSQ_OPT_SSL_CTX and
+	 * MOSQ_OPT_SSL_CTX_WITH_DEFAULTS are set. */
+	if(mosq->tls_cafile || mosq->tls_capath || mosq->tls_psk){
+		if(!mosq->ssl_ctx){
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+			mosq->ssl_ctx = SSL_CTX_new(SSLv23_client_method());
+#else
+			mosq->ssl_ctx = SSL_CTX_new(TLS_client_method());
+#endif
+
+			if(!mosq->ssl_ctx){
+				log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to create TLS context.");
+				COMPAT_CLOSE(mosq->sock);
+				mosq->sock = INVALID_SOCKET;
+				net__print_ssl_error(mosq);
+				return MOSQ_ERR_TLS;
+			}
+		}
+
+		if(!mosq->tls_version){
+			SSL_CTX_set_options(mosq->ssl_ctx, SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1);
+#ifdef SSL_OP_NO_TLSv1_3
+		}else if(!strcmp(mosq->tls_version, "tlsv1.3")){
+			SSL_CTX_set_options(mosq->ssl_ctx, SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1 | SSL_OP_NO_TLSv1_2);
+		}else if(!strcmp(mosq->tls_version, "tlsv1.2")){
+			SSL_CTX_set_options(mosq->ssl_ctx, SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1 | SSL_OP_NO_TLSv1_3);
+		}else if(!strcmp(mosq->tls_version, "tlsv1.1")){
+			SSL_CTX_set_options(mosq->ssl_ctx, SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_2 | SSL_OP_NO_TLSv1_3);
+#else
+		}else if(!strcmp(mosq->tls_version, "tlsv1.2")){
+			SSL_CTX_set_options(mosq->ssl_ctx, SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1);
+		}else if(!strcmp(mosq->tls_version, "tlsv1.1")){
+			SSL_CTX_set_options(mosq->ssl_ctx, SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_2);
+#endif
+		}else{
+			log__printf(mosq, MOSQ_LOG_ERR, "Error: Protocol %s not supported.", mosq->tls_version);
+			COMPAT_CLOSE(mosq->sock);
+			mosq->sock = INVALID_SOCKET;
+			return MOSQ_ERR_INVAL;
+		}
+
+		/* Disable compression */
+		SSL_CTX_set_options(mosq->ssl_ctx, SSL_OP_NO_COMPRESSION);
+
+		/* Set ALPN */
+		if(mosq->tls_alpn) {
+			tls_alpn_len = (uint8_t) strnlen(mosq->tls_alpn, 254);
+			tls_alpn_wire[0] = tls_alpn_len;  // first byte is length of string
+			memcpy(tls_alpn_wire + 1, mosq->tls_alpn, tls_alpn_len);
+			SSL_CTX_set_alpn_protos(mosq->ssl_ctx, tls_alpn_wire, tls_alpn_len + 1);
+		}
+
+#ifdef SSL_MODE_RELEASE_BUFFERS
+			/* Use even less memory per SSL connection. */
+			SSL_CTX_set_mode(mosq->ssl_ctx, SSL_MODE_RELEASE_BUFFERS);
+#endif
+
+#if !defined(OPENSSL_NO_ENGINE)
+		if(mosq->tls_engine){
+			engine = ENGINE_by_id(mosq->tls_engine);
+			if(!engine){
+				log__printf(mosq, MOSQ_LOG_ERR, "Error loading %s engine\n", mosq->tls_engine);
+				COMPAT_CLOSE(mosq->sock);
+				return MOSQ_ERR_TLS;
+			}
+			if(!ENGINE_init(engine)){
+				log__printf(mosq, MOSQ_LOG_ERR, "Failed engine initialisation\n");
+				ENGINE_free(engine);
+				COMPAT_CLOSE(mosq->sock);
+				return MOSQ_ERR_TLS;
+			}
+			ENGINE_set_default(engine, ENGINE_METHOD_ALL);
+			ENGINE_free(engine); /* release the structural reference from ENGINE_by_id() */
+		}
+#endif
+
+		if(mosq->tls_ciphers){
+			ret = SSL_CTX_set_cipher_list(mosq->ssl_ctx, mosq->tls_ciphers);
+			if(ret == 0){
+				log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to set TLS ciphers. Check cipher list \"%s\".", mosq->tls_ciphers);
+#if !defined(OPENSSL_NO_ENGINE)
+				ENGINE_FINISH(engine);
+#endif
+				COMPAT_CLOSE(mosq->sock);
+				mosq->sock = INVALID_SOCKET;
+				net__print_ssl_error(mosq);
+				return MOSQ_ERR_TLS;
+			}
+		}
+		if(mosq->tls_cafile || mosq->tls_capath){
+			ret = SSL_CTX_load_verify_locations(mosq->ssl_ctx, mosq->tls_cafile, mosq->tls_capath);
+			if(ret == 0){
+#ifdef WITH_BROKER
+				if(mosq->tls_cafile && mosq->tls_capath){
+					log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load CA certificates, check bridge_cafile \"%s\" and bridge_capath \"%s\".", mosq->tls_cafile, mosq->tls_capath);
+				}else if(mosq->tls_cafile){
+					log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load CA certificates, check bridge_cafile \"%s\".", mosq->tls_cafile);
+				}else{
+					log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load CA certificates, check bridge_capath \"%s\".", mosq->tls_capath);
+				}
+#else
+				if(mosq->tls_cafile && mosq->tls_capath){
+					log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load CA certificates, check cafile \"%s\" and capath \"%s\".", mosq->tls_cafile, mosq->tls_capath);
+				}else if(mosq->tls_cafile){
+					log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load CA certificates, check cafile \"%s\".", mosq->tls_cafile);
+				}else{
+					log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load CA certificates, check capath \"%s\".", mosq->tls_capath);
+				}
+#endif
+#if !defined(OPENSSL_NO_ENGINE)
+				ENGINE_FINISH(engine);
+#endif
+				COMPAT_CLOSE(mosq->sock);
+				mosq->sock = INVALID_SOCKET;
+				net__print_ssl_error(mosq);
+				return MOSQ_ERR_TLS;
+			}
+			if(mosq->tls_cert_reqs == 0){
+				SSL_CTX_set_verify(mosq->ssl_ctx, SSL_VERIFY_NONE, NULL);
+			}else{
+				SSL_CTX_set_verify(mosq->ssl_ctx, SSL_VERIFY_PEER, mosquitto__server_certificate_verify);
+			}
+
+			if(mosq->tls_pw_callback){
+				SSL_CTX_set_default_passwd_cb(mosq->ssl_ctx, mosq->tls_pw_callback);
+				SSL_CTX_set_default_passwd_cb_userdata(mosq->ssl_ctx, mosq);
+			}
+
+			if(mosq->tls_certfile){
+				ret = SSL_CTX_use_certificate_chain_file(mosq->ssl_ctx, mosq->tls_certfile);
+				if(ret != 1){
+#ifdef WITH_BROKER
+					log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load client certificate, check bridge_certfile \"%s\".", mosq->tls_certfile);
+#else
+					log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load client certificate \"%s\".", mosq->tls_certfile);
+#endif
+#if !defined(OPENSSL_NO_ENGINE)
+					ENGINE_FINISH(engine);
+#endif
+					COMPAT_CLOSE(mosq->sock);
+					mosq->sock = INVALID_SOCKET;
+					net__print_ssl_error(mosq);
+					return MOSQ_ERR_TLS;
+				}
+			}
+			if(mosq->tls_keyfile){
+				if(mosq->tls_keyform == mosq_k_engine){
+#if !defined(OPENSSL_NO_ENGINE)
+					UI_METHOD *ui_method = net__get_ui_method();
+					if(mosq->tls_engine_kpass_sha1){
+						if(!ENGINE_ctrl_cmd(engine, ENGINE_SECRET_MODE, ENGINE_SECRET_MODE_SHA, NULL, NULL, 0)){
+							log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to set engine secret mode sha1");
+							ENGINE_FINISH(engine);
+							COMPAT_CLOSE(mosq->sock);
+							net__print_ssl_error(mosq);
+							return MOSQ_ERR_TLS;
+						}
+						if(!ENGINE_ctrl_cmd(engine, ENGINE_PIN, 0, mosq->tls_engine_kpass_sha1, NULL, 0)){
+							log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to set engine pin");
+							ENGINE_FINISH(engine);
+							COMPAT_CLOSE(mosq->sock);
+							net__print_ssl_error(mosq);
+							return MOSQ_ERR_TLS;
+						}
+						ui_method = NULL;
+					}
+					EVP_PKEY *pkey = ENGINE_load_private_key(engine, mosq->tls_keyfile, ui_method, NULL);
+					if(!pkey){
+						log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load engine private key file \"%s\".", mosq->tls_keyfile);
+						ENGINE_FINISH(engine);
+						COMPAT_CLOSE(mosq->sock);
+						net__print_ssl_error(mosq);
+						return MOSQ_ERR_TLS;
+					}
+					if(SSL_CTX_use_PrivateKey(mosq->ssl_ctx, pkey) <= 0){
+						log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to use engine private key file \"%s\".", mosq->tls_keyfile);
+						ENGINE_FINISH(engine);
+						COMPAT_CLOSE(mosq->sock);
+						net__print_ssl_error(mosq);
+						return MOSQ_ERR_TLS;
+					}
+#endif
+				}else{
+					ret = SSL_CTX_use_PrivateKey_file(mosq->ssl_ctx, mosq->tls_keyfile, SSL_FILETYPE_PEM);
+					if(ret != 1){
+#ifdef WITH_BROKER
+						log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load client key file, check bridge_keyfile \"%s\".", mosq->tls_keyfile);
+#else
+						log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load client key file \"%s\".", mosq->tls_keyfile);
+#endif
+#if !defined(OPENSSL_NO_ENGINE)
+						ENGINE_FINISH(engine);
+#endif
+						COMPAT_CLOSE(mosq->sock);
+						mosq->sock = INVALID_SOCKET;
+						net__print_ssl_error(mosq);
+						return MOSQ_ERR_TLS;
+					}
+				}
+				ret = SSL_CTX_check_private_key(mosq->ssl_ctx);
+				if(ret != 1){
+					log__printf(mosq, MOSQ_LOG_ERR, "Error: Client certificate/key are inconsistent.");
+#if !defined(OPENSSL_NO_ENGINE)
+					ENGINE_FINISH(engine);
+#endif
+					COMPAT_CLOSE(mosq->sock);
+					mosq->sock = INVALID_SOCKET;
+					net__print_ssl_error(mosq);
+					return MOSQ_ERR_TLS;
+				}
+			}
+#ifdef FINAL_WITH_TLS_PSK
+		}else if(mosq->tls_psk){
+			SSL_CTX_set_psk_client_callback(mosq->ssl_ctx, psk_client_callback);
+#endif
+		}
+	}
+
+	return MOSQ_ERR_SUCCESS;
+}
+#endif
+
+
+int net__socket_connect_step3(struct mosquitto *mosq, const char *host)
+{
+#ifdef WITH_TLS
+	BIO *bio;
+
+	int rc = net__init_ssl_ctx(mosq);
+	if(rc) return rc;
+
+	if(mosq->ssl_ctx){
+		if(mosq->ssl){
+			SSL_free(mosq->ssl);
+		}
+		mosq->ssl = SSL_new(mosq->ssl_ctx);
+		if(!mosq->ssl){
+			COMPAT_CLOSE(mosq->sock);
+			mosq->sock = INVALID_SOCKET;
+			net__print_ssl_error(mosq);
+			return MOSQ_ERR_TLS;
+		}
+
+		SSL_set_ex_data(mosq->ssl, tls_ex_index_mosq, mosq);
+		bio = BIO_new_socket(mosq->sock, BIO_NOCLOSE);
+		if(!bio){
+			COMPAT_CLOSE(mosq->sock);
+			mosq->sock = INVALID_SOCKET;
+			net__print_ssl_error(mosq);
+			return MOSQ_ERR_TLS;
+		}
+		SSL_set_bio(mosq->ssl, bio, bio);
+
+		/*
+		 * required for the SNI resolving
+		 */
+		if(SSL_set_tlsext_host_name(mosq->ssl, host) != 1) {
+			COMPAT_CLOSE(mosq->sock);
+			mosq->sock = INVALID_SOCKET;
+			return MOSQ_ERR_TLS;
+		}
+
+		if(net__socket_connect_tls(mosq)){
+			return MOSQ_ERR_TLS;
+		}
+
+	}
+#endif
+	return MOSQ_ERR_SUCCESS;
+}
+
+/* Create a socket and connect it to 'ip' on port 'port'.  */
+int net__socket_connect(struct mosquitto *mosq, const char *host, uint16_t port, const char *bind_address, bool blocking)
+{
+	mosq_sock_t sock = INVALID_SOCKET;
+	int rc, rc2;
+
+	if(!mosq || !host || !port) return MOSQ_ERR_INVAL;
+
+	rc = net__try_connect(host, port, &sock, bind_address, blocking);
+	if(rc > 0) return rc;
+
+	mosq->sock = sock;
+
+#if defined(WITH_SOCKS) && !defined(WITH_BROKER)
+	if(!mosq->socks5_host)
+#endif
+	{
+		rc2 = net__socket_connect_step3(mosq, host);
+		if(rc2) return rc2;
+	}
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+ssize_t net__read(struct mosquitto *mosq, void *buf, size_t count)
+{
+#ifdef WITH_TLS
+	int ret;
+	int err;
+#endif
+	assert(mosq);
+	errno = 0;
+#ifdef WITH_TLS
+	if(mosq->ssl){
+		ERR_clear_error();
+		ret = SSL_read(mosq->ssl, buf, count);
+		if(ret <= 0){
+			err = SSL_get_error(mosq->ssl, ret);
+			if(err == SSL_ERROR_WANT_READ){
+				ret = -1;
+				errno = EAGAIN;
+			}else if(err == SSL_ERROR_WANT_WRITE){
+				ret = -1;
+				mosq->want_write = true;
+				errno = EAGAIN;
+			}else{
+				net__print_ssl_error(mosq);
+				errno = EPROTO;
+			}
+#ifdef WIN32
+			WSASetLastError(errno);
+#endif
+		}
+		return (ssize_t )ret;
+	}else{
+		/* Call normal read/recv */
+
+#endif
+
+#ifndef WIN32
+	return read(mosq->sock, buf, count);
+#else
+	return recv(mosq->sock, buf, count, 0);
+#endif
+
+#ifdef WITH_TLS
+	}
+#endif
+}
+
+ssize_t net__write(struct mosquitto *mosq, void *buf, size_t count)
+{
+#ifdef WITH_TLS
+	int ret;
+	int err;
+#endif
+	assert(mosq);
+
+	errno = 0;
+#ifdef WITH_TLS
+	if(mosq->ssl){
+		mosq->want_write = false;
+		ERR_clear_error();
+		ret = SSL_write(mosq->ssl, buf, count);
+		if(ret < 0){
+			err = SSL_get_error(mosq->ssl, ret);
+			if(err == SSL_ERROR_WANT_READ){
+				ret = -1;
+				errno = EAGAIN;
+			}else if(err == SSL_ERROR_WANT_WRITE){
+				ret = -1;
+				mosq->want_write = true;
+				errno = EAGAIN;
+			}else{
+				net__print_ssl_error(mosq);
+				errno = EPROTO;
+			}
+#ifdef WIN32
+			WSASetLastError(errno);
+#endif
+		}
+		return (ssize_t )ret;
+	}else{
+		/* Call normal write/send */
+#endif
+
+#ifndef WIN32
+	return write(mosq->sock, buf, count);
+#else
+	return send(mosq->sock, buf, count, 0);
+#endif
+
+#ifdef WITH_TLS
+	}
+#endif
+}
+
+
+int net__socket_nonblock(mosq_sock_t *sock)
+{
+#ifndef WIN32
+	int opt;
+	/* Set non-blocking */
+	opt = fcntl(*sock, F_GETFL, 0);
+	if(opt == -1){
+		COMPAT_CLOSE(*sock);
+		*sock = INVALID_SOCKET;
+		return MOSQ_ERR_ERRNO;
+	}
+	if(fcntl(*sock, F_SETFL, opt | O_NONBLOCK) == -1){
+		/* If either fcntl fails, don't want to allow this client to connect. */
+		COMPAT_CLOSE(*sock);
+		return MOSQ_ERR_ERRNO;
+	}
+#else
+	unsigned long opt = 1;
+	if(ioctlsocket(*sock, FIONBIO, &opt)){
+		COMPAT_CLOSE(*sock);
+		return MOSQ_ERR_ERRNO;
+	}
+#endif
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+#ifndef WITH_BROKER
+int net__socketpair(mosq_sock_t *pairR, mosq_sock_t *pairW)
+{
+#ifdef WIN32
+	int family[2] = {AF_INET, AF_INET6};
+	int i;
+	struct sockaddr_storage ss;
+	struct sockaddr_in *sa = (struct sockaddr_in *)&ss;
+	struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)&ss;
+	socklen_t ss_len;
+	mosq_sock_t spR, spW;
+
+	mosq_sock_t listensock;
+
+	*pairR = INVALID_SOCKET;
+	*pairW = INVALID_SOCKET;
+
+	for(i=0; i<2; i++){
+		memset(&ss, 0, sizeof(ss));
+		if(family[i] == AF_INET){
+			sa->sin_family = family[i];
+			sa->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+			sa->sin_port = 0;
+			ss_len = sizeof(struct sockaddr_in);
+		}else if(family[i] == AF_INET6){
+			sa6->sin6_family = family[i];
+			sa6->sin6_addr = in6addr_loopback;
+			sa6->sin6_port = 0;
+			ss_len = sizeof(struct sockaddr_in6);
+		}else{
+			return MOSQ_ERR_INVAL;
+		}
+
+		listensock = socket(family[i], SOCK_STREAM, IPPROTO_TCP);
+		if(listensock == -1){
+			continue;
+		}
+
+		if(bind(listensock, (struct sockaddr *)&ss, ss_len) == -1){
+			COMPAT_CLOSE(listensock);
+			continue;
+		}
+
+		if(listen(listensock, 1) == -1){
+			COMPAT_CLOSE(listensock);
+			continue;
+		}
+		memset(&ss, 0, sizeof(ss));
+		ss_len = sizeof(ss);
+		if(getsockname(listensock, (struct sockaddr *)&ss, &ss_len) < 0){
+			COMPAT_CLOSE(listensock);
+			continue;
+		}
+
+		if(family[i] == AF_INET){
+			sa->sin_family = family[i];
+			sa->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+			ss_len = sizeof(struct sockaddr_in);
+		}else if(family[i] == AF_INET6){
+			sa6->sin6_family = family[i];
+			sa6->sin6_addr = in6addr_loopback;
+			ss_len = sizeof(struct sockaddr_in6);
+		}
+
+		spR = socket(family[i], SOCK_STREAM, IPPROTO_TCP);
+		if(spR == -1){
+			COMPAT_CLOSE(listensock);
+			continue;
+		}
+		if(net__socket_nonblock(&spR)){
+			COMPAT_CLOSE(listensock);
+			continue;
+		}
+		if(connect(spR, (struct sockaddr *)&ss, ss_len) < 0){
+#ifdef WIN32
+			errno = WSAGetLastError();
+#endif
+			if(errno != EINPROGRESS && errno != COMPAT_EWOULDBLOCK){
+				COMPAT_CLOSE(spR);
+				COMPAT_CLOSE(listensock);
+				continue;
+			}
+		}
+		spW = accept(listensock, NULL, 0);
+		if(spW == -1){
+#ifdef WIN32
+			errno = WSAGetLastError();
+#endif
+			if(errno != EINPROGRESS && errno != COMPAT_EWOULDBLOCK){
+				COMPAT_CLOSE(spR);
+				COMPAT_CLOSE(listensock);
+				continue;
+			}
+		}
+
+		if(net__socket_nonblock(&spW)){
+			COMPAT_CLOSE(spR);
+			COMPAT_CLOSE(listensock);
+			continue;
+		}
+		COMPAT_CLOSE(listensock);
+
+		*pairR = spR;
+		*pairW = spW;
+		return MOSQ_ERR_SUCCESS;
+	}
+	return MOSQ_ERR_UNKNOWN;
+#else
+	int sv[2];
+
+	if(socketpair(AF_UNIX, SOCK_STREAM, 0, sv) == -1){
+		return MOSQ_ERR_ERRNO;
+	}
+	if(net__socket_nonblock(&sv[0])){
+		COMPAT_CLOSE(sv[1]);
+		return MOSQ_ERR_ERRNO;
+	}
+	if(net__socket_nonblock(&sv[1])){
+		COMPAT_CLOSE(sv[0]);
+		return MOSQ_ERR_ERRNO;
+	}
+	*pairR = sv[0];
+	*pairW = sv[1];
+	return MOSQ_ERR_SUCCESS;
+#endif
+}
+#endif
diff --git a/libs/libmosquitto/src/net_mosq.h b/libs/libmosquitto/src/net_mosq.h
new file mode 100644
index 0000000000..b843ebe388
--- /dev/null
+++ b/libs/libmosquitto/src/net_mosq.h
@@ -0,0 +1,82 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+#ifndef NET_MOSQ_H
+#define NET_MOSQ_H
+
+#ifndef WIN32
+#include <unistd.h>
+#else
+#include <winsock2.h>
+typedef SSIZE_T ssize_t;
+#endif
+
+#include "mosquitto_internal.h"
+#include "mosquitto.h"
+
+#ifdef WITH_BROKER
+struct mosquitto_db;
+#endif
+
+#ifdef WIN32
+#  define COMPAT_CLOSE(a) closesocket(a)
+#  define COMPAT_ECONNRESET WSAECONNRESET
+#  define COMPAT_EWOULDBLOCK WSAEWOULDBLOCK
+#else
+#  define COMPAT_CLOSE(a) close(a)
+#  define COMPAT_ECONNRESET ECONNRESET
+#  define COMPAT_EWOULDBLOCK EWOULDBLOCK
+#endif
+
+/* For when not using winsock libraries. */
+#ifndef INVALID_SOCKET
+#define INVALID_SOCKET -1
+#endif
+
+/* Macros for accessing the MSB and LSB of a uint16_t */
+#define MOSQ_MSB(A) (uint8_t)((A & 0xFF00) >> 8)
+#define MOSQ_LSB(A) (uint8_t)(A & 0x00FF)
+
+int net__init(void);
+void net__cleanup(void);
+
+int net__socket_connect(struct mosquitto *mosq, const char *host, uint16_t port, const char *bind_address, bool blocking);
+#ifdef WITH_BROKER
+int net__socket_close(struct mosquitto_db *db, struct mosquitto *mosq);
+#else
+int net__socket_close(struct mosquitto *mosq);
+#endif
+int net__try_connect(const char *host, uint16_t port, mosq_sock_t *sock, const char *bind_address, bool blocking);
+int net__try_connect_step1(struct mosquitto *mosq, const char *host);
+int net__try_connect_step2(struct mosquitto *mosq, uint16_t port, mosq_sock_t *sock);
+int net__socket_connect_step3(struct mosquitto *mosq, const char *host);
+int net__socket_nonblock(mosq_sock_t *sock);
+int net__socketpair(mosq_sock_t *sp1, mosq_sock_t *sp2);
+
+ssize_t net__read(struct mosquitto *mosq, void *buf, size_t count);
+ssize_t net__write(struct mosquitto *mosq, void *buf, size_t count);
+
+#ifdef WITH_TLS
+int net__socket_apply_tls(struct mosquitto *mosq);
+int net__socket_connect_tls(struct mosquitto *mosq);
+int mosquitto__verify_ocsp_status_cb(SSL * ssl, void *arg);
+UI_METHOD *net__get_ui_method(void);
+#define ENGINE_FINISH(e) if(e) ENGINE_finish(e)
+#define ENGINE_SECRET_MODE "SECRET_MODE"
+#define ENGINE_SECRET_MODE_SHA 0x1000
+#define ENGINE_PIN "PIN"
+#endif
+
+#endif
diff --git a/libs/libmosquitto/src/net_mosq_ocsp.c b/libs/libmosquitto/src/net_mosq_ocsp.c
new file mode 100644
index 0000000000..32f2a3e321
--- /dev/null
+++ b/libs/libmosquitto/src/net_mosq_ocsp.c
@@ -0,0 +1,159 @@
+/*
+Copyright (c) 2009-2014 Roger Light <roger@atchoo.org>
+Copyright (c) 2017 Bayerische Motoren Werke Aktiengesellschaft (BMW AG), Dr. Lars Voelker <lars.voelker@bmw.de>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Dr. Lars Voelker, BMW AG
+*/
+
+/*
+COPYRIGHT AND PERMISSION NOTICE of curl on which the ocsp code is based:
+
+Copyright (c) 1996 - 2016, Daniel Stenberg, <daniel@haxx.se>, and many
+contributors, see the THANKS file.
+
+All rights reserved.
+
+Permission to use, copy, modify, and distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright
+notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN
+NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
+OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of a copyright holder shall not
+be used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization of the copyright holder.
+*/
+
+#ifdef WITH_TLS
+#include <logging_mosq.h>
+#include <mosquitto_internal.h>
+#include <net_mosq.h>
+
+#include <openssl/safestack.h>
+#include <openssl/tls1.h>
+#include <openssl/ssl.h>
+#include <openssl/ocsp.h>
+
+int mosquitto__verify_ocsp_status_cb(SSL * ssl, void *arg)
+{
+	struct mosquitto *mosq = (struct mosquitto *)arg;
+	int ocsp_status, result2, i;
+	unsigned char *p;
+	const unsigned char *cp;
+	OCSP_RESPONSE *rsp = NULL;
+	OCSP_BASICRESP *br = NULL;
+	X509_STORE     *st = NULL;
+	STACK_OF(X509) *ch = NULL;
+
+	long len = SSL_get_tlsext_status_ocsp_resp(mosq->ssl, &p);
+	log__printf(mosq, MOSQ_LOG_DEBUG, "OCSP: SSL_get_tlsext_status_ocsp_resp returned %ld bytes", len);
+
+	// the following functions expect a const pointer
+	cp = (const unsigned char *)p;
+
+	if (!cp || len <= 0) {
+		log__printf(mosq, MOSQ_LOG_DEBUG, "OCSP: no response");
+		goto end;
+	}
+
+
+	rsp = d2i_OCSP_RESPONSE(NULL, &cp, len);
+	if (rsp==NULL) {
+		log__printf(mosq, MOSQ_LOG_DEBUG, "OCSP: invalid response");
+		goto end;
+	}
+
+	ocsp_status = OCSP_response_status(rsp);
+	if(ocsp_status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
+		log__printf(mosq, MOSQ_LOG_DEBUG, "OCSP: invalid status: %s (%d)",
+			       OCSP_response_status_str(ocsp_status), ocsp_status);
+		goto end;
+	}
+
+	br = OCSP_response_get1_basic(rsp);
+	if (!br) {
+		log__printf(mosq, MOSQ_LOG_DEBUG, "OCSP: invalid response");
+		goto end;
+	}
+
+	ch = SSL_get_peer_cert_chain(mosq->ssl);
+	if (sk_X509_num(ch) <= 0) {
+		log__printf(mosq, MOSQ_LOG_ERR, "OCSP: we did not receive certificates of the server (num: %d)", sk_X509_num(ch));
+		goto end;
+	}
+
+	st = SSL_CTX_get_cert_store(mosq->ssl_ctx);
+
+	// Note:
+	//    Other checkers often fix problems in OpenSSL before 1.0.2a (e.g. libcurl).
+	//    For all currently supported versions of the OpenSSL project, this is not needed anymore.
+
+	if ((result2=OCSP_basic_verify(br, ch, st, 0)) <= 0) {
+		log__printf(mosq, MOSQ_LOG_DEBUG, "OCSP: response verification failed (error: %d)", result2);
+		goto end;
+	}
+
+	for(i = 0; i < OCSP_resp_count(br); i++) {
+		int cert_status, crl_reason;
+		OCSP_SINGLERESP *single = NULL;
+
+		ASN1_GENERALIZEDTIME *rev, *thisupd, *nextupd;
+
+		single = OCSP_resp_get0(br, i);
+		if(!single)
+			continue;
+
+		cert_status = OCSP_single_get0_status(single, &crl_reason, &rev, &thisupd, &nextupd);
+
+		log__printf(mosq, MOSQ_LOG_DEBUG, "OCSP: SSL certificate status: %s (%d)",
+				OCSP_cert_status_str(cert_status), cert_status);
+
+		switch(cert_status) {
+			case V_OCSP_CERTSTATUS_GOOD:
+				// Note: A OCSP stapling result will be accepted up to 5 minutes after it expired!
+				if(!OCSP_check_validity(thisupd, nextupd, 300L, -1L)) {
+					log__printf(mosq, MOSQ_LOG_DEBUG, "OCSP: OCSP response has expired");
+					goto end;
+				}
+				break;
+
+			case V_OCSP_CERTSTATUS_REVOKED:
+				log__printf(mosq, MOSQ_LOG_DEBUG, "OCSP: SSL certificate revocation reason: %s (%d)",
+					OCSP_crl_reason_str(crl_reason), crl_reason);
+				goto end;
+
+			case V_OCSP_CERTSTATUS_UNKNOWN:
+				goto end;
+
+			default:
+				log__printf(mosq, MOSQ_LOG_DEBUG, "OCSP: SSL certificate revocation status unknown");
+				goto end;
+		}
+	}
+
+	if (br!=NULL)  OCSP_BASICRESP_free(br);
+	if (rsp!=NULL) OCSP_RESPONSE_free(rsp);
+	return 1; // OK
+
+end:
+	if (br!=NULL)  OCSP_BASICRESP_free(br);
+	if (rsp!=NULL) OCSP_RESPONSE_free(rsp);
+	return 0; // Not OK
+}
+#endif
diff --git a/libs/libmosquitto/src/options.c b/libs/libmosquitto/src/options.c
new file mode 100644
index 0000000000..7bab736628
--- /dev/null
+++ b/libs/libmosquitto/src/options.c
@@ -0,0 +1,486 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#ifndef WIN32
+#  include <strings.h>
+#endif
+
+#include <string.h>
+
+#ifdef WITH_TLS
+#  ifdef WIN32
+#    include <winsock2.h>
+#  endif
+#  include <openssl/engine.h>
+#endif
+
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+#include "memory_mosq.h"
+#include "mqtt_protocol.h"
+#include "util_mosq.h"
+#include "will_mosq.h"
+
+
+int mosquitto_will_set(struct mosquitto *mosq, const char *topic, int payloadlen, const void *payload, int qos, bool retain)
+{
+	return mosquitto_will_set_v5(mosq, topic, payloadlen, payload, qos, retain, NULL);
+}
+
+
+int mosquitto_will_set_v5(struct mosquitto *mosq, const char *topic, int payloadlen, const void *payload, int qos, bool retain, mosquitto_property *properties)
+{
+	int rc;
+
+	if(!mosq) return MOSQ_ERR_INVAL;
+
+	if(properties){
+		rc = mosquitto_property_check_all(CMD_WILL, properties);
+		if(rc) return rc;
+	}
+
+	return will__set(mosq, topic, payloadlen, payload, qos, retain, properties);
+}
+
+
+int mosquitto_will_clear(struct mosquitto *mosq)
+{
+	if(!mosq) return MOSQ_ERR_INVAL;
+	return will__clear(mosq);
+}
+
+
+int mosquitto_username_pw_set(struct mosquitto *mosq, const char *username, const char *password)
+{
+	if(!mosq) return MOSQ_ERR_INVAL;
+
+	if(mosq->protocol == mosq_p_mqtt311 || mosq->protocol == mosq_p_mqtt31){
+		if(password != NULL && username == NULL){
+			return MOSQ_ERR_INVAL;
+		}
+	}
+
+	mosquitto__free(mosq->username);
+	mosq->username = NULL;
+
+	mosquitto__free(mosq->password);
+	mosq->password = NULL;
+
+	if(username){
+		if(mosquitto_validate_utf8(username, strlen(username))){
+			return MOSQ_ERR_MALFORMED_UTF8;
+		}
+		mosq->username = mosquitto__strdup(username);
+		if(!mosq->username) return MOSQ_ERR_NOMEM;
+	}
+
+	if(password){
+		mosq->password = mosquitto__strdup(password);
+		if(!mosq->password){
+			mosquitto__free(mosq->username);
+			mosq->username = NULL;
+			return MOSQ_ERR_NOMEM;
+		}
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int mosquitto_reconnect_delay_set(struct mosquitto *mosq, unsigned int reconnect_delay, unsigned int reconnect_delay_max, bool reconnect_exponential_backoff)
+{
+	if(!mosq) return MOSQ_ERR_INVAL;
+	
+	if(reconnect_delay == 0) reconnect_delay = 1;
+
+	mosq->reconnect_delay = reconnect_delay;
+	mosq->reconnect_delay_max = reconnect_delay_max;
+	mosq->reconnect_exponential_backoff = reconnect_exponential_backoff;
+	
+	return MOSQ_ERR_SUCCESS;
+	
+}
+
+
+int mosquitto_tls_set(struct mosquitto *mosq, const char *cafile, const char *capath, const char *certfile, const char *keyfile, int (*pw_callback)(char *buf, int size, int rwflag, void *userdata))
+{
+#ifdef WITH_TLS
+	FILE *fptr;
+
+	if(!mosq || (!cafile && !capath) || (certfile && !keyfile) || (!certfile && keyfile)) return MOSQ_ERR_INVAL;
+
+	mosquitto__free(mosq->tls_cafile);
+	mosq->tls_cafile = NULL;
+	if(cafile){
+		fptr = mosquitto__fopen(cafile, "rt", false);
+		if(fptr){
+			fclose(fptr);
+		}else{
+			return MOSQ_ERR_INVAL;
+		}
+		mosq->tls_cafile = mosquitto__strdup(cafile);
+
+		if(!mosq->tls_cafile){
+			return MOSQ_ERR_NOMEM;
+		}
+	}
+
+	mosquitto__free(mosq->tls_capath);
+	mosq->tls_capath = NULL;
+	if(capath){
+		mosq->tls_capath = mosquitto__strdup(capath);
+		if(!mosq->tls_capath){
+			return MOSQ_ERR_NOMEM;
+		}
+	}
+
+	mosquitto__free(mosq->tls_certfile);
+	mosq->tls_certfile = NULL;
+	if(certfile){
+		fptr = mosquitto__fopen(certfile, "rt", false);
+		if(fptr){
+			fclose(fptr);
+		}else{
+			mosquitto__free(mosq->tls_cafile);
+			mosq->tls_cafile = NULL;
+
+			mosquitto__free(mosq->tls_capath);
+			mosq->tls_capath = NULL;
+			return MOSQ_ERR_INVAL;
+		}
+		mosq->tls_certfile = mosquitto__strdup(certfile);
+		if(!mosq->tls_certfile){
+			return MOSQ_ERR_NOMEM;
+		}
+	}
+
+	mosquitto__free(mosq->tls_keyfile);
+	mosq->tls_keyfile = NULL;
+	if(keyfile){
+		fptr = mosquitto__fopen(keyfile, "rt", false);
+		if(fptr){
+			fclose(fptr);
+		}else{
+			mosquitto__free(mosq->tls_cafile);
+			mosq->tls_cafile = NULL;
+
+			mosquitto__free(mosq->tls_capath);
+			mosq->tls_capath = NULL;
+
+			mosquitto__free(mosq->tls_certfile);
+			mosq->tls_certfile = NULL;
+			return MOSQ_ERR_INVAL;
+		}
+		mosq->tls_keyfile = mosquitto__strdup(keyfile);
+		if(!mosq->tls_keyfile){
+			return MOSQ_ERR_NOMEM;
+		}
+	}
+
+	mosq->tls_pw_callback = pw_callback;
+
+
+	return MOSQ_ERR_SUCCESS;
+#else
+	return MOSQ_ERR_NOT_SUPPORTED;
+
+#endif
+}
+
+
+int mosquitto_tls_opts_set(struct mosquitto *mosq, int cert_reqs, const char *tls_version, const char *ciphers)
+{
+#ifdef WITH_TLS
+	if(!mosq) return MOSQ_ERR_INVAL;
+
+	mosq->tls_cert_reqs = cert_reqs;
+	if(tls_version){
+		if(!strcasecmp(tls_version, "tlsv1.3")
+				|| !strcasecmp(tls_version, "tlsv1.2")
+				|| !strcasecmp(tls_version, "tlsv1.1")){
+
+			mosq->tls_version = mosquitto__strdup(tls_version);
+			if(!mosq->tls_version) return MOSQ_ERR_NOMEM;
+		}else{
+			return MOSQ_ERR_INVAL;
+		}
+	}else{
+		mosq->tls_version = mosquitto__strdup("tlsv1.2");
+		if(!mosq->tls_version) return MOSQ_ERR_NOMEM;
+	}
+	if(ciphers){
+		mosq->tls_ciphers = mosquitto__strdup(ciphers);
+		if(!mosq->tls_ciphers) return MOSQ_ERR_NOMEM;
+	}else{
+		mosq->tls_ciphers = NULL;
+	}
+
+
+	return MOSQ_ERR_SUCCESS;
+#else
+	return MOSQ_ERR_NOT_SUPPORTED;
+
+#endif
+}
+
+
+int mosquitto_tls_insecure_set(struct mosquitto *mosq, bool value)
+{
+#ifdef WITH_TLS
+	if(!mosq) return MOSQ_ERR_INVAL;
+	mosq->tls_insecure = value;
+	return MOSQ_ERR_SUCCESS;
+#else
+	return MOSQ_ERR_NOT_SUPPORTED;
+#endif
+}
+
+
+int mosquitto_string_option(struct mosquitto *mosq, enum mosq_opt_t option, const char *value)
+{
+#ifdef WITH_TLS
+	ENGINE *eng;
+	char *str;
+#endif
+
+	if(!mosq) return MOSQ_ERR_INVAL;
+
+	switch(option){
+		case MOSQ_OPT_TLS_ENGINE:
+#ifdef WITH_TLS
+#    if !defined(OPENSSL_NO_ENGINE)
+			eng = ENGINE_by_id(value);
+			if(!eng){
+				return MOSQ_ERR_INVAL;
+			}
+			ENGINE_free(eng); /* release the structural reference from ENGINE_by_id() */
+			mosq->tls_engine = mosquitto__strdup(value);
+			if(!mosq->tls_engine){
+				return MOSQ_ERR_NOMEM;
+			}
+			return MOSQ_ERR_SUCCESS;
+#endif
+#else
+			return MOSQ_ERR_NOT_SUPPORTED;
+#endif
+			break;
+
+		case MOSQ_OPT_TLS_KEYFORM:
+#ifdef WITH_TLS
+			if(!value) return MOSQ_ERR_INVAL;
+			if(!strcasecmp(value, "pem")){
+				mosq->tls_keyform = mosq_k_pem;
+			}else if (!strcasecmp(value, "engine")){
+				mosq->tls_keyform = mosq_k_engine;
+			}else{
+				return MOSQ_ERR_INVAL;
+			}
+#else
+			return MOSQ_ERR_NOT_SUPPORTED;
+#endif
+			break;
+
+
+		case MOSQ_OPT_TLS_ENGINE_KPASS_SHA1:
+#ifdef WITH_TLS
+			if(mosquitto__hex2bin_sha1(value, (unsigned char**)&str) != MOSQ_ERR_SUCCESS){
+				return MOSQ_ERR_INVAL;
+			}
+			mosq->tls_engine_kpass_sha1 = str;
+			return MOSQ_ERR_SUCCESS;
+#else
+			return MOSQ_ERR_NOT_SUPPORTED;
+#endif
+			break;
+
+		case MOSQ_OPT_TLS_ALPN:
+#ifdef WITH_TLS
+			mosq->tls_alpn = mosquitto__strdup(value);
+			if(!mosq->tls_alpn){
+				return MOSQ_ERR_NOMEM;
+			}
+			return MOSQ_ERR_SUCCESS;
+#else
+			return MOSQ_ERR_NOT_SUPPORTED;
+#endif
+			break;
+
+		default:
+			return MOSQ_ERR_INVAL;
+	}
+
+	return MOSQ_ERR_INVAL;
+}
+
+
+int mosquitto_tls_psk_set(struct mosquitto *mosq, const char *psk, const char *identity, const char *ciphers)
+{
+#ifdef FINAL_WITH_TLS_PSK
+	if(!mosq || !psk || !identity) return MOSQ_ERR_INVAL;
+
+	/* Check for hex only digits */
+	if(strspn(psk, "0123456789abcdefABCDEF") < strlen(psk)){
+		return MOSQ_ERR_INVAL;
+	}
+	mosq->tls_psk = mosquitto__strdup(psk);
+	if(!mosq->tls_psk) return MOSQ_ERR_NOMEM;
+
+	mosq->tls_psk_identity = mosquitto__strdup(identity);
+	if(!mosq->tls_psk_identity){
+		mosquitto__free(mosq->tls_psk);
+		return MOSQ_ERR_NOMEM;
+	}
+	if(ciphers){
+		mosq->tls_ciphers = mosquitto__strdup(ciphers);
+		if(!mosq->tls_ciphers) return MOSQ_ERR_NOMEM;
+	}else{
+		mosq->tls_ciphers = NULL;
+	}
+
+	return MOSQ_ERR_SUCCESS;
+#else
+	return MOSQ_ERR_NOT_SUPPORTED;
+#endif
+}
+
+
+int mosquitto_opts_set(struct mosquitto *mosq, enum mosq_opt_t option, void *value)
+{
+	int ival;
+
+	if(!mosq || !value) return MOSQ_ERR_INVAL;
+
+	switch(option){
+		case MOSQ_OPT_PROTOCOL_VERSION:
+			ival = *((int *)value);
+			return mosquitto_int_option(mosq, option, ival);
+		case MOSQ_OPT_SSL_CTX:
+#ifdef WITH_TLS
+			mosq->ssl_ctx = (SSL_CTX *)value;
+			if(mosq->ssl_ctx){
+#if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
+				SSL_CTX_up_ref(mosq->ssl_ctx);
+#else
+				CRYPTO_add(&(mosq->ssl_ctx)->references, 1, CRYPTO_LOCK_SSL_CTX);
+#endif
+			}
+			break;
+#else
+			return MOSQ_ERR_NOT_SUPPORTED;
+#endif
+		default:
+			return MOSQ_ERR_INVAL;
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int mosquitto_int_option(struct mosquitto *mosq, enum mosq_opt_t option, int value)
+{
+	if(!mosq) return MOSQ_ERR_INVAL;
+
+	switch(option){
+		case MOSQ_OPT_PROTOCOL_VERSION:
+			if(value == MQTT_PROTOCOL_V31){
+				mosq->protocol = mosq_p_mqtt31;
+			}else if(value == MQTT_PROTOCOL_V311){
+				mosq->protocol = mosq_p_mqtt311;
+			}else if(value == MQTT_PROTOCOL_V5){
+				mosq->protocol = mosq_p_mqtt5;
+			}else{
+				return MOSQ_ERR_INVAL;
+			}
+			break;
+
+		case MOSQ_OPT_RECEIVE_MAXIMUM:
+			if(value < 0 || value > 65535){
+				return MOSQ_ERR_INVAL;
+			}
+			mosq->receive_maximum = value;
+			break;
+
+		case MOSQ_OPT_SEND_MAXIMUM:
+			if(value < 0 || value > 65535){
+				return MOSQ_ERR_INVAL;
+			}
+			mosq->send_maximum = value;
+			break;
+
+		case MOSQ_OPT_SSL_CTX_WITH_DEFAULTS:
+#if defined(WITH_TLS) && OPENSSL_VERSION_NUMBER >= 0x10100000L
+			if(value){
+				mosq->ssl_ctx_defaults = true;
+			}else{
+				mosq->ssl_ctx_defaults = false;
+			}
+			break;
+#else
+			return MOSQ_ERR_NOT_SUPPORTED;
+#endif
+
+		case MOSQ_OPT_TLS_OCSP_REQUIRED:
+#ifdef WITH_TLS
+			mosq->tls_ocsp_required = (bool)value;
+#else
+			return MOSQ_ERR_NOT_SUPPORTED;
+#endif
+			break;
+
+		default:
+			return MOSQ_ERR_INVAL;
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int mosquitto_void_option(struct mosquitto *mosq, enum mosq_opt_t option, void *value)
+{
+	if(!mosq || !value) return MOSQ_ERR_INVAL;
+
+	switch(option){
+		case MOSQ_OPT_SSL_CTX:
+#ifdef WITH_TLS
+			mosq->ssl_ctx = (SSL_CTX *)value;
+			if(mosq->ssl_ctx){
+#if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
+				SSL_CTX_up_ref(mosq->ssl_ctx);
+#else
+				CRYPTO_add(&(mosq->ssl_ctx)->references, 1, CRYPTO_LOCK_SSL_CTX);
+#endif
+			}
+			break;
+#else
+			return MOSQ_ERR_NOT_SUPPORTED;
+#endif
+		default:
+			return MOSQ_ERR_INVAL;
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+void mosquitto_user_data_set(struct mosquitto *mosq, void *userdata)
+{
+	if(mosq){
+		mosq->userdata = userdata;
+	}
+}
+
+void *mosquitto_userdata(struct mosquitto *mosq)
+{
+	return mosq->userdata;
+}
diff --git a/libs/libmosquitto/src/packet_datatypes.c b/libs/libmosquitto/src/packet_datatypes.c
new file mode 100644
index 0000000000..335cb9f02d
--- /dev/null
+++ b/libs/libmosquitto/src/packet_datatypes.c
@@ -0,0 +1,271 @@
+/*
+Copyright (c) 2009-2018 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#  ifdef WITH_WEBSOCKETS
+#    include <libwebsockets.h>
+#  endif
+#else
+#  include "read_handle.h"
+#endif
+
+#include "memory_mosq.h"
+#include "mqtt_protocol.h"
+#include "net_mosq.h"
+#include "packet_mosq.h"
+#include "read_handle.h"
+#ifdef WITH_BROKER
+#  include "sys_tree.h"
+#else
+#  define G_BYTES_RECEIVED_INC(A)
+#  define G_BYTES_SENT_INC(A)
+#  define G_MSGS_SENT_INC(A)
+#  define G_PUB_MSGS_SENT_INC(A)
+#endif
+
+
+int packet__read_byte(struct mosquitto__packet *packet, uint8_t *byte)
+{
+	assert(packet);
+	if(packet->pos+1 > packet->remaining_length) return MOSQ_ERR_PROTOCOL;
+
+	*byte = packet->payload[packet->pos];
+	packet->pos++;
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+void packet__write_byte(struct mosquitto__packet *packet, uint8_t byte)
+{
+	assert(packet);
+	assert(packet->pos+1 <= packet->packet_length);
+
+	packet->payload[packet->pos] = byte;
+	packet->pos++;
+}
+
+
+int packet__read_bytes(struct mosquitto__packet *packet, void *bytes, uint32_t count)
+{
+	assert(packet);
+	if(packet->pos+count > packet->remaining_length) return MOSQ_ERR_PROTOCOL;
+
+	memcpy(bytes, &(packet->payload[packet->pos]), count);
+	packet->pos += count;
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+void packet__write_bytes(struct mosquitto__packet *packet, const void *bytes, uint32_t count)
+{
+	assert(packet);
+	assert(packet->pos+count <= packet->packet_length);
+
+	memcpy(&(packet->payload[packet->pos]), bytes, count);
+	packet->pos += count;
+}
+
+
+int packet__read_binary(struct mosquitto__packet *packet, uint8_t **data, int *length)
+{
+	uint16_t slen;
+	int rc;
+
+	assert(packet);
+	rc = packet__read_uint16(packet, &slen);
+	if(rc) return rc;
+
+	if(slen == 0){
+		*data = NULL;
+		*length = 0;
+		return MOSQ_ERR_SUCCESS;
+	}
+
+	if(packet->pos+slen > packet->remaining_length) return MOSQ_ERR_PROTOCOL;
+
+	*data = mosquitto__malloc(slen+1);
+	if(*data){
+		memcpy(*data, &(packet->payload[packet->pos]), slen);
+		((uint8_t *)(*data))[slen] = '\0';
+		packet->pos += slen;
+	}else{
+		return MOSQ_ERR_NOMEM;
+	}
+
+	*length = slen;
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int packet__read_string(struct mosquitto__packet *packet, char **str, int *length)
+{
+	int rc;
+
+	rc = packet__read_binary(packet, (uint8_t **)str, length);
+	if(rc) return rc;
+	if(*length == 0) return MOSQ_ERR_SUCCESS;
+
+	if(mosquitto_validate_utf8(*str, *length)){
+		mosquitto__free(*str);
+		*str = NULL;
+		*length = -1;
+		return MOSQ_ERR_MALFORMED_UTF8;
+	}
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+void packet__write_string(struct mosquitto__packet *packet, const char *str, uint16_t length)
+{
+	assert(packet);
+	packet__write_uint16(packet, length);
+	packet__write_bytes(packet, str, length);
+}
+
+
+int packet__read_uint16(struct mosquitto__packet *packet, uint16_t *word)
+{
+	uint8_t msb, lsb;
+
+	assert(packet);
+	if(packet->pos+2 > packet->remaining_length) return MOSQ_ERR_PROTOCOL;
+
+	msb = packet->payload[packet->pos];
+	packet->pos++;
+	lsb = packet->payload[packet->pos];
+	packet->pos++;
+
+	*word = (msb<<8) + lsb;
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+void packet__write_uint16(struct mosquitto__packet *packet, uint16_t word)
+{
+	packet__write_byte(packet, MOSQ_MSB(word));
+	packet__write_byte(packet, MOSQ_LSB(word));
+}
+
+
+int packet__read_uint32(struct mosquitto__packet *packet, uint32_t *word)
+{
+	uint32_t val = 0;
+	int i;
+
+	assert(packet);
+	if(packet->pos+4 > packet->remaining_length) return MOSQ_ERR_PROTOCOL;
+
+	for(i=0; i<4; i++){
+		val = (val << 8) + packet->payload[packet->pos];
+		packet->pos++;
+	}
+
+	*word = val;
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+void packet__write_uint32(struct mosquitto__packet *packet, uint32_t word)
+{
+	packet__write_byte(packet, (word & 0xFF000000) >> 24);
+	packet__write_byte(packet, (word & 0x00FF0000) >> 16);
+	packet__write_byte(packet, (word & 0x0000FF00) >> 8);
+	packet__write_byte(packet, (word & 0x000000FF));
+}
+
+
+int packet__read_varint(struct mosquitto__packet *packet, int32_t *word, int8_t *bytes)
+{
+	int i;
+	uint8_t byte;
+	int remaining_mult = 1;
+	int32_t lword = 0;
+	uint8_t lbytes = 0;
+
+	for(i=0; i<4; i++){
+		if(packet->pos < packet->remaining_length){
+			lbytes++;
+			byte = packet->payload[packet->pos];
+			lword += (byte & 127) * remaining_mult;
+			remaining_mult *= 128;
+			packet->pos++;
+			if((byte & 128) == 0){
+				if(lbytes > 1 && byte == 0){
+					/* Catch overlong encodings */
+					return MOSQ_ERR_PROTOCOL;
+				}else{
+					*word = lword;
+					if(bytes) (*bytes) = lbytes;
+					return MOSQ_ERR_SUCCESS;
+				}
+			}
+		}else{
+			return MOSQ_ERR_PROTOCOL;
+		}
+	}
+	return MOSQ_ERR_PROTOCOL;
+}
+
+
+int packet__write_varint(struct mosquitto__packet *packet, int32_t word)
+{
+	uint8_t byte;
+	int count = 0;
+
+	do{
+		byte = word % 128;
+		word = word / 128;
+		/* If there are more digits to encode, set the top bit of this digit */
+		if(word > 0){
+			byte = byte | 0x80;
+		}
+		packet__write_byte(packet, byte);
+		count++;
+	}while(word > 0 && count < 5);
+
+	if(count == 5){
+		return MOSQ_ERR_PROTOCOL;
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int packet__varint_bytes(int32_t word)
+{
+	if(word < 128){
+		return 1;
+	}else if(word < 16384){
+		return 2;
+	}else if(word < 2097152){
+		return 3;
+	}else if(word < 268435456){
+		return 4;
+	}else{
+		return 5;
+	}
+}
diff --git a/libs/libmosquitto/src/packet_mosq.c b/libs/libmosquitto/src/packet_mosq.c
new file mode 100644
index 0000000000..0f7af7426c
--- /dev/null
+++ b/libs/libmosquitto/src/packet_mosq.c
@@ -0,0 +1,456 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#  ifdef WITH_WEBSOCKETS
+#    include <libwebsockets.h>
+#  endif
+#else
+#  include "read_handle.h"
+#endif
+
+#include "memory_mosq.h"
+#include "mqtt_protocol.h"
+#include "net_mosq.h"
+#include "packet_mosq.h"
+#include "read_handle.h"
+#ifdef WITH_BROKER
+#  include "sys_tree.h"
+#  include "send_mosq.h"
+#else
+#  define G_BYTES_RECEIVED_INC(A)
+#  define G_BYTES_SENT_INC(A)
+#  define G_MSGS_SENT_INC(A)
+#  define G_PUB_MSGS_SENT_INC(A)
+#endif
+
+int packet__alloc(struct mosquitto__packet *packet)
+{
+	uint8_t remaining_bytes[5], byte;
+	uint32_t remaining_length;
+	int i;
+
+	assert(packet);
+
+	remaining_length = packet->remaining_length;
+	packet->payload = NULL;
+	packet->remaining_count = 0;
+	do{
+		byte = remaining_length % 128;
+		remaining_length = remaining_length / 128;
+		/* If there are more digits to encode, set the top bit of this digit */
+		if(remaining_length > 0){
+			byte = byte | 0x80;
+		}
+		remaining_bytes[packet->remaining_count] = byte;
+		packet->remaining_count++;
+	}while(remaining_length > 0 && packet->remaining_count < 5);
+	if(packet->remaining_count == 5) return MOSQ_ERR_PAYLOAD_SIZE;
+	packet->packet_length = packet->remaining_length + 1 + packet->remaining_count;
+#ifdef WITH_WEBSOCKETS
+	packet->payload = mosquitto__malloc(sizeof(uint8_t)*packet->packet_length + LWS_SEND_BUFFER_PRE_PADDING + LWS_SEND_BUFFER_POST_PADDING);
+#else
+	packet->payload = mosquitto__malloc(sizeof(uint8_t)*packet->packet_length);
+#endif
+	if(!packet->payload) return MOSQ_ERR_NOMEM;
+
+	packet->payload[0] = packet->command;
+	for(i=0; i<packet->remaining_count; i++){
+		packet->payload[i+1] = remaining_bytes[i];
+	}
+	packet->pos = 1 + packet->remaining_count;
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+void packet__cleanup(struct mosquitto__packet *packet)
+{
+	if(!packet) return;
+
+	/* Free data and reset values */
+	packet->command = 0;
+	packet->remaining_count = 0;
+	packet->remaining_mult = 1;
+	packet->remaining_length = 0;
+	mosquitto__free(packet->payload);
+	packet->payload = NULL;
+	packet->to_process = 0;
+	packet->pos = 0;
+}
+
+int packet__queue(struct mosquitto *mosq, struct mosquitto__packet *packet)
+{
+#ifndef WITH_BROKER
+	char sockpair_data = 0;
+#endif
+	assert(mosq);
+	assert(packet);
+
+	packet->pos = 0;
+	packet->to_process = packet->packet_length;
+
+	packet->next = NULL;
+	pthread_mutex_lock(&mosq->out_packet_mutex);
+	if(mosq->out_packet){
+		mosq->out_packet_last->next = packet;
+	}else{
+		mosq->out_packet = packet;
+	}
+	mosq->out_packet_last = packet;
+	pthread_mutex_unlock(&mosq->out_packet_mutex);
+#ifdef WITH_BROKER
+#  ifdef WITH_WEBSOCKETS
+	if(mosq->wsi){
+		libwebsocket_callback_on_writable(mosq->ws_context, mosq->wsi);
+		return MOSQ_ERR_SUCCESS;
+	}else{
+		return packet__write(mosq);
+	}
+#  else
+	return packet__write(mosq);
+#  endif
+#else
+
+	/* Write a single byte to sockpairW (connected to sockpairR) to break out
+	 * of select() if in threaded mode. */
+	if(mosq->sockpairW != INVALID_SOCKET){
+#ifndef WIN32
+		if(write(mosq->sockpairW, &sockpair_data, 1)){
+		}
+#else
+		send(mosq->sockpairW, &sockpair_data, 1, 0);
+#endif
+	}
+
+	if(mosq->in_callback == false && mosq->threaded == mosq_ts_none){
+		return packet__write(mosq);
+	}else{
+		return MOSQ_ERR_SUCCESS;
+	}
+#endif
+}
+
+
+int packet__check_oversize(struct mosquitto *mosq, uint32_t remaining_length)
+{
+	uint32_t len;
+
+	if(mosq->maximum_packet_size == 0) return MOSQ_ERR_SUCCESS;
+
+	len = remaining_length + packet__varint_bytes(remaining_length);
+	if(len > mosq->maximum_packet_size){
+		return MOSQ_ERR_OVERSIZE_PACKET;
+	}else{
+		return MOSQ_ERR_SUCCESS;
+	}
+}
+
+
+int packet__write(struct mosquitto *mosq)
+{
+	ssize_t write_length;
+	struct mosquitto__packet *packet;
+
+	if(!mosq) return MOSQ_ERR_INVAL;
+	if(mosq->sock == INVALID_SOCKET) return MOSQ_ERR_NO_CONN;
+
+	pthread_mutex_lock(&mosq->current_out_packet_mutex);
+	pthread_mutex_lock(&mosq->out_packet_mutex);
+	if(mosq->out_packet && !mosq->current_out_packet){
+		mosq->current_out_packet = mosq->out_packet;
+		mosq->out_packet = mosq->out_packet->next;
+		if(!mosq->out_packet){
+			mosq->out_packet_last = NULL;
+		}
+	}
+	pthread_mutex_unlock(&mosq->out_packet_mutex);
+
+#if defined(WITH_TLS) && !defined(WITH_BROKER)
+	if((mosq->state == mosq_cs_connect_pending) || mosq->want_connect){
+#else
+	if(mosq->state == mosq_cs_connect_pending){
+#endif
+		pthread_mutex_unlock(&mosq->current_out_packet_mutex);
+		return MOSQ_ERR_SUCCESS;
+	}
+
+	while(mosq->current_out_packet){
+		packet = mosq->current_out_packet;
+
+		while(packet->to_process > 0){
+			write_length = net__write(mosq, &(packet->payload[packet->pos]), packet->to_process);
+			if(write_length > 0){
+				G_BYTES_SENT_INC(write_length);
+				packet->to_process -= write_length;
+				packet->pos += write_length;
+			}else{
+#ifdef WIN32
+				errno = WSAGetLastError();
+#endif
+				if(errno == EAGAIN || errno == COMPAT_EWOULDBLOCK){
+					pthread_mutex_unlock(&mosq->current_out_packet_mutex);
+					return MOSQ_ERR_SUCCESS;
+				}else{
+					pthread_mutex_unlock(&mosq->current_out_packet_mutex);
+					switch(errno){
+						case COMPAT_ECONNRESET:
+							return MOSQ_ERR_CONN_LOST;
+						default:
+							return MOSQ_ERR_ERRNO;
+					}
+				}
+			}
+		}
+
+		G_MSGS_SENT_INC(1);
+		if(((packet->command)&0xF6) == CMD_PUBLISH){
+			G_PUB_MSGS_SENT_INC(1);
+#ifndef WITH_BROKER
+			pthread_mutex_lock(&mosq->callback_mutex);
+			if(mosq->on_publish){
+				/* This is a QoS=0 message */
+				mosq->in_callback = true;
+				mosq->on_publish(mosq, mosq->userdata, packet->mid);
+				mosq->in_callback = false;
+			}
+			if(mosq->on_publish_v5){
+				/* This is a QoS=0 message */
+				mosq->in_callback = true;
+				mosq->on_publish_v5(mosq, mosq->userdata, packet->mid, 0, NULL);
+				mosq->in_callback = false;
+			}
+			pthread_mutex_unlock(&mosq->callback_mutex);
+		}else if(((packet->command)&0xF0) == CMD_DISCONNECT){
+			do_client_disconnect(mosq, MOSQ_ERR_SUCCESS, NULL);
+			packet__cleanup(packet);
+			mosquitto__free(packet);
+			return MOSQ_ERR_SUCCESS;
+#endif
+		}
+
+		/* Free data and reset values */
+		pthread_mutex_lock(&mosq->out_packet_mutex);
+		mosq->current_out_packet = mosq->out_packet;
+		if(mosq->out_packet){
+			mosq->out_packet = mosq->out_packet->next;
+			if(!mosq->out_packet){
+				mosq->out_packet_last = NULL;
+			}
+		}
+		pthread_mutex_unlock(&mosq->out_packet_mutex);
+
+		packet__cleanup(packet);
+		mosquitto__free(packet);
+
+		pthread_mutex_lock(&mosq->msgtime_mutex);
+		mosq->next_msg_out = mosquitto_time() + mosq->keepalive;
+		pthread_mutex_unlock(&mosq->msgtime_mutex);
+	}
+	pthread_mutex_unlock(&mosq->current_out_packet_mutex);
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+#ifdef WITH_BROKER
+int packet__read(struct mosquitto_db *db, struct mosquitto *mosq)
+#else
+int packet__read(struct mosquitto *mosq)
+#endif
+{
+	uint8_t byte;
+	ssize_t read_length;
+	int rc = 0;
+
+	if(!mosq){
+		return MOSQ_ERR_INVAL;
+	}
+	if(mosq->sock == INVALID_SOCKET){
+		return MOSQ_ERR_NO_CONN;
+	}
+	if(mosq->state == mosq_cs_connect_pending){
+		return MOSQ_ERR_SUCCESS;
+	}
+
+	/* This gets called if pselect() indicates that there is network data
+	 * available - ie. at least one byte.  What we do depends on what data we
+	 * already have.
+	 * If we've not got a command, attempt to read one and save it. This should
+	 * always work because it's only a single byte.
+	 * Then try to read the remaining length. This may fail because it is may
+	 * be more than one byte - will need to save data pending next read if it
+	 * does fail.
+	 * Then try to read the remaining payload, where 'payload' here means the
+	 * combined variable header and actual payload. This is the most likely to
+	 * fail due to longer length, so save current data and current position.
+	 * After all data is read, send to mosquitto__handle_packet() to deal with.
+	 * Finally, free the memory and reset everything to starting conditions.
+	 */
+	if(!mosq->in_packet.command){
+		read_length = net__read(mosq, &byte, 1);
+		if(read_length == 1){
+			mosq->in_packet.command = byte;
+#ifdef WITH_BROKER
+			G_BYTES_RECEIVED_INC(1);
+			/* Clients must send CONNECT as their first command. */
+			if(!(mosq->bridge) && mosq->state == mosq_cs_new && (byte&0xF0) != CMD_CONNECT){
+				return MOSQ_ERR_PROTOCOL;
+			}
+#endif
+		}else{
+			if(read_length == 0){
+				return MOSQ_ERR_CONN_LOST; /* EOF */
+			}
+#ifdef WIN32
+			errno = WSAGetLastError();
+#endif
+			if(errno == EAGAIN || errno == COMPAT_EWOULDBLOCK){
+				return MOSQ_ERR_SUCCESS;
+			}else{
+				switch(errno){
+					case COMPAT_ECONNRESET:
+						return MOSQ_ERR_CONN_LOST;
+					default:
+						return MOSQ_ERR_ERRNO;
+				}
+			}
+		}
+	}
+	/* remaining_count is the number of bytes that the remaining_length
+	 * parameter occupied in this incoming packet. We don't use it here as such
+	 * (it is used when allocating an outgoing packet), but we must be able to
+	 * determine whether all of the remaining_length parameter has been read.
+	 * remaining_count has three states here:
+	 *   0 means that we haven't read any remaining_length bytes
+	 *   <0 means we have read some remaining_length bytes but haven't finished
+	 *   >0 means we have finished reading the remaining_length bytes.
+	 */
+	if(mosq->in_packet.remaining_count <= 0){
+		do{
+			read_length = net__read(mosq, &byte, 1);
+			if(read_length == 1){
+				mosq->in_packet.remaining_count--;
+				/* Max 4 bytes length for remaining length as defined by protocol.
+				 * Anything more likely means a broken/malicious client.
+				 */
+				if(mosq->in_packet.remaining_count < -4){
+					return MOSQ_ERR_PROTOCOL;
+				}
+
+				G_BYTES_RECEIVED_INC(1);
+				mosq->in_packet.remaining_length += (byte & 127) * mosq->in_packet.remaining_mult;
+				mosq->in_packet.remaining_mult *= 128;
+			}else{
+				if(read_length == 0){
+					return MOSQ_ERR_CONN_LOST; /* EOF */
+				}
+#ifdef WIN32
+				errno = WSAGetLastError();
+#endif
+				if(errno == EAGAIN || errno == COMPAT_EWOULDBLOCK){
+					return MOSQ_ERR_SUCCESS;
+				}else{
+					switch(errno){
+						case COMPAT_ECONNRESET:
+							return MOSQ_ERR_CONN_LOST;
+						default:
+							return MOSQ_ERR_ERRNO;
+					}
+				}
+			}
+		}while((byte & 128) != 0);
+		/* We have finished reading remaining_length, so make remaining_count
+		 * positive. */
+		mosq->in_packet.remaining_count *= -1;
+
+#ifdef WITH_BROKER
+		if(db->config->max_packet_size > 0 && mosq->in_packet.remaining_length+1 > db->config->max_packet_size){
+			log__printf(NULL, MOSQ_LOG_INFO, "Client %s sent too large packet %d, disconnecting.", mosq->id, mosq->in_packet.remaining_length+1);
+			if(mosq->protocol == mosq_p_mqtt5){
+				send__disconnect(mosq, MQTT_RC_PACKET_TOO_LARGE, NULL);
+			}
+			return MOSQ_ERR_OVERSIZE_PACKET;
+		}
+#else
+		// FIXME - client case for incoming message received from broker too large
+#endif
+		if(mosq->in_packet.remaining_length > 0){
+			mosq->in_packet.payload = mosquitto__malloc(mosq->in_packet.remaining_length*sizeof(uint8_t));
+			if(!mosq->in_packet.payload){
+				return MOSQ_ERR_NOMEM;
+			}
+			mosq->in_packet.to_process = mosq->in_packet.remaining_length;
+		}
+	}
+	while(mosq->in_packet.to_process>0){
+		read_length = net__read(mosq, &(mosq->in_packet.payload[mosq->in_packet.pos]), mosq->in_packet.to_process);
+		if(read_length > 0){
+			G_BYTES_RECEIVED_INC(read_length);
+			mosq->in_packet.to_process -= read_length;
+			mosq->in_packet.pos += read_length;
+		}else{
+#ifdef WIN32
+			errno = WSAGetLastError();
+#endif
+			if(errno == EAGAIN || errno == COMPAT_EWOULDBLOCK){
+				if(mosq->in_packet.to_process > 1000){
+					/* Update last_msg_in time if more than 1000 bytes left to
+					 * receive. Helps when receiving large messages.
+					 * This is an arbitrary limit, but with some consideration.
+					 * If a client can't send 1000 bytes in a second it
+					 * probably shouldn't be using a 1 second keep alive. */
+					pthread_mutex_lock(&mosq->msgtime_mutex);
+					mosq->last_msg_in = mosquitto_time();
+					pthread_mutex_unlock(&mosq->msgtime_mutex);
+				}
+				return MOSQ_ERR_SUCCESS;
+			}else{
+				switch(errno){
+					case COMPAT_ECONNRESET:
+						return MOSQ_ERR_CONN_LOST;
+					default:
+						return MOSQ_ERR_ERRNO;
+				}
+			}
+		}
+	}
+
+	/* All data for this packet is read. */
+	mosq->in_packet.pos = 0;
+#ifdef WITH_BROKER
+	G_MSGS_RECEIVED_INC(1);
+	if(((mosq->in_packet.command)&0xF5) == CMD_PUBLISH){
+		G_PUB_MSGS_RECEIVED_INC(1);
+	}
+	rc = handle__packet(db, mosq);
+#else
+	rc = handle__packet(mosq);
+#endif
+
+	/* Free data and reset values */
+	packet__cleanup(&mosq->in_packet);
+
+	pthread_mutex_lock(&mosq->msgtime_mutex);
+	mosq->last_msg_in = mosquitto_time();
+	pthread_mutex_unlock(&mosq->msgtime_mutex);
+	return rc;
+}
diff --git a/libs/libmosquitto/src/packet_mosq.h b/libs/libmosquitto/src/packet_mosq.h
new file mode 100644
index 0000000000..5967f09406
--- /dev/null
+++ b/libs/libmosquitto/src/packet_mosq.h
@@ -0,0 +1,56 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+#ifndef PACKET_MOSQ_H
+#define PACKET_MOSQ_H
+
+#include "mosquitto_internal.h"
+#include "mosquitto.h"
+
+#ifdef WITH_BROKER
+struct mosquitto_db;
+#endif
+
+int packet__alloc(struct mosquitto__packet *packet);
+void packet__cleanup(struct mosquitto__packet *packet);
+int packet__queue(struct mosquitto *mosq, struct mosquitto__packet *packet);
+
+int packet__check_oversize(struct mosquitto *mosq, uint32_t remaining_length);
+
+int packet__read_byte(struct mosquitto__packet *packet, uint8_t *byte);
+int packet__read_bytes(struct mosquitto__packet *packet, void *bytes, uint32_t count);
+int packet__read_binary(struct mosquitto__packet *packet, uint8_t **data, int *length);
+int packet__read_string(struct mosquitto__packet *packet, char **str, int *length);
+int packet__read_uint16(struct mosquitto__packet *packet, uint16_t *word);
+int packet__read_uint32(struct mosquitto__packet *packet, uint32_t *word);
+int packet__read_varint(struct mosquitto__packet *packet, int32_t *word, int8_t *bytes);
+
+void packet__write_byte(struct mosquitto__packet *packet, uint8_t byte);
+void packet__write_bytes(struct mosquitto__packet *packet, const void *bytes, uint32_t count);
+void packet__write_string(struct mosquitto__packet *packet, const char *str, uint16_t length);
+void packet__write_uint16(struct mosquitto__packet *packet, uint16_t word);
+void packet__write_uint32(struct mosquitto__packet *packet, uint32_t word);
+int packet__write_varint(struct mosquitto__packet *packet, int32_t word);
+
+int packet__varint_bytes(int32_t word);
+
+int packet__write(struct mosquitto *mosq);
+#ifdef WITH_BROKER
+int packet__read(struct mosquitto_db *db, struct mosquitto *mosq);
+#else
+int packet__read(struct mosquitto *mosq);
+#endif
+
+#endif
diff --git a/libs/libmosquitto/src/property_mosq.c b/libs/libmosquitto/src/property_mosq.c
new file mode 100644
index 0000000000..76158e584d
--- /dev/null
+++ b/libs/libmosquitto/src/property_mosq.c
@@ -0,0 +1,1181 @@
+/*
+Copyright (c) 2018 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+
+#include "logging_mosq.h"
+#include "memory_mosq.h"
+#include "mqtt_protocol.h"
+#include "packet_mosq.h"
+#include "property_mosq.h"
+
+
+int property__read(struct mosquitto__packet *packet, int32_t *len, mosquitto_property *property)
+{
+	int rc;
+	int32_t property_identifier;
+	uint8_t byte;
+	int8_t byte_count;
+	uint16_t uint16;
+	uint32_t uint32;
+	int32_t varint;
+	char *str1, *str2;
+	int slen1, slen2;
+
+	if(!property) return MOSQ_ERR_INVAL;
+
+	rc = packet__read_varint(packet, &property_identifier, NULL);
+	if(rc) return rc;
+	*len -= 1;
+
+	memset(property, 0, sizeof(mosquitto_property));
+
+	property->identifier = property_identifier;
+
+	switch(property_identifier){
+		case MQTT_PROP_PAYLOAD_FORMAT_INDICATOR:
+		case MQTT_PROP_REQUEST_PROBLEM_INFORMATION:
+		case MQTT_PROP_REQUEST_RESPONSE_INFORMATION:
+		case MQTT_PROP_MAXIMUM_QOS:
+		case MQTT_PROP_RETAIN_AVAILABLE:
+		case MQTT_PROP_WILDCARD_SUB_AVAILABLE:
+		case MQTT_PROP_SUBSCRIPTION_ID_AVAILABLE:
+		case MQTT_PROP_SHARED_SUB_AVAILABLE:
+			rc = packet__read_byte(packet, &byte);
+			if(rc) return rc;
+			*len -= 1; /* byte */
+			property->value.i8 = byte;
+			break;
+
+		case MQTT_PROP_SERVER_KEEP_ALIVE:
+		case MQTT_PROP_RECEIVE_MAXIMUM:
+		case MQTT_PROP_TOPIC_ALIAS_MAXIMUM:
+		case MQTT_PROP_TOPIC_ALIAS:
+			rc = packet__read_uint16(packet, &uint16);
+			if(rc) return rc;
+			*len -= 2; /* uint16 */
+			property->value.i16 = uint16;
+			break;
+
+		case MQTT_PROP_MESSAGE_EXPIRY_INTERVAL:
+		case MQTT_PROP_SESSION_EXPIRY_INTERVAL:
+		case MQTT_PROP_WILL_DELAY_INTERVAL:
+		case MQTT_PROP_MAXIMUM_PACKET_SIZE:
+			rc = packet__read_uint32(packet, &uint32);
+			if(rc) return rc;
+			*len -= 4; /* uint32 */
+			property->value.i32 = uint32;
+			break;
+
+		case MQTT_PROP_SUBSCRIPTION_IDENTIFIER:
+			rc = packet__read_varint(packet, &varint, &byte_count);
+			if(rc) return rc;
+			*len -= byte_count;
+			property->value.varint = varint;
+			break;
+
+		case MQTT_PROP_CONTENT_TYPE:
+		case MQTT_PROP_RESPONSE_TOPIC:
+		case MQTT_PROP_ASSIGNED_CLIENT_IDENTIFIER:
+		case MQTT_PROP_AUTHENTICATION_METHOD:
+		case MQTT_PROP_RESPONSE_INFORMATION:
+		case MQTT_PROP_SERVER_REFERENCE:
+		case MQTT_PROP_REASON_STRING:
+			rc = packet__read_string(packet, &str1, &slen1);
+			if(rc) return rc;
+			*len = (*len) - 2 - slen1; /* uint16, string len */
+			property->value.s.v = str1;
+			property->value.s.len = slen1;
+			break;
+
+		case MQTT_PROP_AUTHENTICATION_DATA:
+		case MQTT_PROP_CORRELATION_DATA:
+			rc = packet__read_binary(packet, (uint8_t **)&str1, &slen1);
+			if(rc) return rc;
+			*len = (*len) - 2 - slen1; /* uint16, binary len */
+			property->value.bin.v = str1;
+			property->value.bin.len = slen1;
+			break;
+
+		case MQTT_PROP_USER_PROPERTY:
+			rc = packet__read_string(packet, &str1, &slen1);
+			if(rc) return rc;
+			*len = (*len) - 2 - slen1; /* uint16, string len */
+
+			rc = packet__read_string(packet, &str2, &slen2);
+			if(rc){
+				mosquitto__free(str1);
+				return rc;
+			}
+			*len = (*len) - 2 - slen2; /* uint16, string len */
+
+			property->name.v = str1;
+			property->name.len = slen1;
+			property->value.s.v = str2;
+			property->value.s.len = slen2;
+			break;
+
+		default:
+			log__printf(NULL, MOSQ_LOG_DEBUG, "Unsupported property type: %d", property_identifier);
+			return MOSQ_ERR_MALFORMED_PACKET;
+	}
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int property__read_all(int command, struct mosquitto__packet *packet, mosquitto_property **properties)
+{
+	int rc;
+	int32_t proplen;
+	mosquitto_property *p, *tail = NULL;
+
+	rc = packet__read_varint(packet, &proplen, NULL);
+	if(rc) return rc;
+
+	*properties = NULL;
+
+	/* The order of properties must be preserved for some types, so keep the
+	 * same order for all */
+	while(proplen > 0){
+		p = mosquitto__calloc(1, sizeof(mosquitto_property));
+		if(!p){
+			mosquitto_property_free_all(properties);
+			return MOSQ_ERR_NOMEM;
+		}
+
+		rc = property__read(packet, &proplen, p); 
+		if(rc){
+			mosquitto__free(p);
+			mosquitto_property_free_all(properties);
+			return rc;
+		}
+
+		if(!(*properties)){
+			*properties = p;
+		}else{
+			tail->next = p;
+		}
+		tail = p;
+
+	}
+
+	rc = mosquitto_property_check_all(command, *properties);
+	if(rc){
+		mosquitto_property_free_all(properties);
+		return rc;
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+void property__free(mosquitto_property **property)
+{
+	if(!property || !(*property)) return;
+
+	switch((*property)->identifier){
+		case MQTT_PROP_CONTENT_TYPE:
+		case MQTT_PROP_RESPONSE_TOPIC:
+		case MQTT_PROP_ASSIGNED_CLIENT_IDENTIFIER:
+		case MQTT_PROP_AUTHENTICATION_METHOD:
+		case MQTT_PROP_RESPONSE_INFORMATION:
+		case MQTT_PROP_SERVER_REFERENCE:
+		case MQTT_PROP_REASON_STRING:
+			mosquitto__free((*property)->value.s.v);
+			break;
+
+		case MQTT_PROP_AUTHENTICATION_DATA:
+		case MQTT_PROP_CORRELATION_DATA:
+			mosquitto__free((*property)->value.bin.v);
+			break;
+
+		case MQTT_PROP_USER_PROPERTY:
+			mosquitto__free((*property)->name.v);
+			mosquitto__free((*property)->value.s.v);
+			break;
+
+		case MQTT_PROP_PAYLOAD_FORMAT_INDICATOR:
+		case MQTT_PROP_MESSAGE_EXPIRY_INTERVAL:
+		case MQTT_PROP_SUBSCRIPTION_IDENTIFIER:
+		case MQTT_PROP_SESSION_EXPIRY_INTERVAL:
+		case MQTT_PROP_SERVER_KEEP_ALIVE:
+		case MQTT_PROP_REQUEST_PROBLEM_INFORMATION:
+		case MQTT_PROP_WILL_DELAY_INTERVAL:
+		case MQTT_PROP_REQUEST_RESPONSE_INFORMATION:
+		case MQTT_PROP_RECEIVE_MAXIMUM:
+		case MQTT_PROP_TOPIC_ALIAS_MAXIMUM:
+		case MQTT_PROP_TOPIC_ALIAS:
+		case MQTT_PROP_MAXIMUM_QOS:
+		case MQTT_PROP_RETAIN_AVAILABLE:
+		case MQTT_PROP_MAXIMUM_PACKET_SIZE:
+		case MQTT_PROP_WILDCARD_SUB_AVAILABLE:
+		case MQTT_PROP_SUBSCRIPTION_ID_AVAILABLE:
+		case MQTT_PROP_SHARED_SUB_AVAILABLE:
+			/* Nothing to free */
+			break;
+	}
+
+	free(*property);
+	*property = NULL;
+}
+
+
+void mosquitto_property_free_all(mosquitto_property **property)
+{
+	mosquitto_property *p, *next;
+
+	if(!property) return;
+
+	p = *property;
+	while(p){
+		next = p->next;
+		property__free(&p);
+		p = next;
+	}
+	*property = NULL;
+}
+
+
+int property__get_length(const mosquitto_property *property)
+{
+	if(!property) return 0;
+
+	switch(property->identifier){
+		/* Byte */
+		case MQTT_PROP_PAYLOAD_FORMAT_INDICATOR:
+		case MQTT_PROP_REQUEST_PROBLEM_INFORMATION:
+		case MQTT_PROP_REQUEST_RESPONSE_INFORMATION:
+		case MQTT_PROP_MAXIMUM_QOS:
+		case MQTT_PROP_RETAIN_AVAILABLE:
+		case MQTT_PROP_WILDCARD_SUB_AVAILABLE:
+		case MQTT_PROP_SUBSCRIPTION_ID_AVAILABLE:
+		case MQTT_PROP_SHARED_SUB_AVAILABLE:
+			return 2; /* 1 (identifier) + 1 byte */
+
+		/* uint16 */
+		case MQTT_PROP_SERVER_KEEP_ALIVE:
+		case MQTT_PROP_RECEIVE_MAXIMUM:
+		case MQTT_PROP_TOPIC_ALIAS_MAXIMUM:
+		case MQTT_PROP_TOPIC_ALIAS:
+			return 3; /* 1 (identifier) + 2 bytes */
+
+		/* uint32 */
+		case MQTT_PROP_MESSAGE_EXPIRY_INTERVAL:
+		case MQTT_PROP_WILL_DELAY_INTERVAL:
+		case MQTT_PROP_MAXIMUM_PACKET_SIZE:
+		case MQTT_PROP_SESSION_EXPIRY_INTERVAL:
+			return 5; /* 1 (identifier) + 4 bytes */
+
+		/* varint */
+		case MQTT_PROP_SUBSCRIPTION_IDENTIFIER:
+			if(property->value.varint < 128){
+				return 2;
+			}else if(property->value.varint < 16384){
+				return 3;
+			}else if(property->value.varint < 2097152){
+				return 4;
+			}else if(property->value.varint < 268435456){
+				return 5;
+			}else{
+				return 0;
+			}
+
+		/* binary */
+		case MQTT_PROP_CORRELATION_DATA:
+		case MQTT_PROP_AUTHENTICATION_DATA:
+			return 3 + property->value.bin.len; /* 1 + 2 bytes (len) + X bytes (payload) */
+
+		/* string */
+		case MQTT_PROP_CONTENT_TYPE:
+		case MQTT_PROP_RESPONSE_TOPIC:
+		case MQTT_PROP_ASSIGNED_CLIENT_IDENTIFIER:
+		case MQTT_PROP_AUTHENTICATION_METHOD:
+		case MQTT_PROP_RESPONSE_INFORMATION:
+		case MQTT_PROP_SERVER_REFERENCE:
+		case MQTT_PROP_REASON_STRING:
+			return 3 + property->value.s.len; /* 1 + 2 bytes (len) + X bytes (string) */
+
+		/* string pair */
+		case MQTT_PROP_USER_PROPERTY:
+			return 5 + property->value.s.len + property->name.len; /* 1 + 2*(2 bytes (len) + X bytes (string))*/
+
+		default:
+			return 0;
+	}
+	return 0;
+}
+
+
+int property__get_length_all(const mosquitto_property *property)
+{
+	const mosquitto_property *p;
+	int len = 0;
+
+	p = property;
+	while(p){
+		len += property__get_length(p);
+		p = p->next;
+	}
+	return len;
+}
+
+
+int property__write(struct mosquitto__packet *packet, const mosquitto_property *property)
+{
+	int rc;
+
+	rc = packet__write_varint(packet, property->identifier);
+	if(rc) return rc;
+
+	switch(property->identifier){
+		case MQTT_PROP_PAYLOAD_FORMAT_INDICATOR:
+		case MQTT_PROP_REQUEST_PROBLEM_INFORMATION:
+		case MQTT_PROP_REQUEST_RESPONSE_INFORMATION:
+		case MQTT_PROP_MAXIMUM_QOS:
+		case MQTT_PROP_RETAIN_AVAILABLE:
+		case MQTT_PROP_WILDCARD_SUB_AVAILABLE:
+		case MQTT_PROP_SUBSCRIPTION_ID_AVAILABLE:
+		case MQTT_PROP_SHARED_SUB_AVAILABLE:
+			packet__write_byte(packet, property->value.i8);
+			break;
+
+		case MQTT_PROP_SERVER_KEEP_ALIVE:
+		case MQTT_PROP_RECEIVE_MAXIMUM:
+		case MQTT_PROP_TOPIC_ALIAS_MAXIMUM:
+		case MQTT_PROP_TOPIC_ALIAS:
+			packet__write_uint16(packet, property->value.i16);
+			break;
+
+		case MQTT_PROP_MESSAGE_EXPIRY_INTERVAL:
+		case MQTT_PROP_SESSION_EXPIRY_INTERVAL:
+		case MQTT_PROP_WILL_DELAY_INTERVAL:
+		case MQTT_PROP_MAXIMUM_PACKET_SIZE:
+			packet__write_uint32(packet, property->value.i32);
+			break;
+
+		case MQTT_PROP_SUBSCRIPTION_IDENTIFIER:
+			return packet__write_varint(packet, property->value.varint);
+
+		case MQTT_PROP_CONTENT_TYPE:
+		case MQTT_PROP_RESPONSE_TOPIC:
+		case MQTT_PROP_ASSIGNED_CLIENT_IDENTIFIER:
+		case MQTT_PROP_AUTHENTICATION_METHOD:
+		case MQTT_PROP_RESPONSE_INFORMATION:
+		case MQTT_PROP_SERVER_REFERENCE:
+		case MQTT_PROP_REASON_STRING:
+			packet__write_string(packet, property->value.s.v, property->value.s.len);
+			break;
+
+		case MQTT_PROP_AUTHENTICATION_DATA:
+		case MQTT_PROP_CORRELATION_DATA:
+			packet__write_uint16(packet, property->value.bin.len);
+			packet__write_bytes(packet, property->value.bin.v, property->value.bin.len);
+			break;
+
+		case MQTT_PROP_USER_PROPERTY:
+			packet__write_string(packet, property->name.v, property->name.len);
+			packet__write_string(packet, property->value.s.v, property->value.s.len);
+			break;
+
+		default:
+			log__printf(NULL, MOSQ_LOG_DEBUG, "Unsupported property type: %d", property->identifier);
+			return MOSQ_ERR_INVAL;
+	}
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int property__write_all(struct mosquitto__packet *packet, const mosquitto_property *properties, bool write_len)
+{
+	int rc;
+	const mosquitto_property *p;
+
+	if(write_len){
+		rc = packet__write_varint(packet, property__get_length_all(properties));
+		if(rc) return rc;
+	}
+
+	p = properties;
+	while(p){
+		rc = property__write(packet, p);
+		if(rc) return rc;
+		p = p->next;
+	}
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int mosquitto_property_check_command(int command, int identifier)
+{
+	switch(identifier){
+		case MQTT_PROP_PAYLOAD_FORMAT_INDICATOR:
+		case MQTT_PROP_MESSAGE_EXPIRY_INTERVAL:
+		case MQTT_PROP_CONTENT_TYPE:
+		case MQTT_PROP_RESPONSE_TOPIC:
+		case MQTT_PROP_CORRELATION_DATA:
+			if(command != CMD_PUBLISH && command != CMD_WILL){
+				return MOSQ_ERR_PROTOCOL;
+			}
+			break;
+
+		case MQTT_PROP_SUBSCRIPTION_IDENTIFIER:
+			if(command != CMD_PUBLISH && command != CMD_SUBSCRIBE){
+				return MOSQ_ERR_PROTOCOL;
+			}
+			break;
+
+		case MQTT_PROP_SESSION_EXPIRY_INTERVAL:
+			if(command != CMD_CONNECT && command != CMD_CONNACK && command != CMD_DISCONNECT){
+				return MOSQ_ERR_PROTOCOL;
+			}
+			break;
+
+		case MQTT_PROP_AUTHENTICATION_METHOD:
+		case MQTT_PROP_AUTHENTICATION_DATA:
+			if(command != CMD_CONNECT && command != CMD_CONNACK && command != CMD_AUTH){
+				return MOSQ_ERR_PROTOCOL;
+			}
+			break;
+
+		case MQTT_PROP_ASSIGNED_CLIENT_IDENTIFIER:
+		case MQTT_PROP_SERVER_KEEP_ALIVE:
+		case MQTT_PROP_RESPONSE_INFORMATION:
+		case MQTT_PROP_MAXIMUM_QOS:
+		case MQTT_PROP_RETAIN_AVAILABLE:
+		case MQTT_PROP_WILDCARD_SUB_AVAILABLE:
+		case MQTT_PROP_SUBSCRIPTION_ID_AVAILABLE:
+		case MQTT_PROP_SHARED_SUB_AVAILABLE:
+			if(command != CMD_CONNACK){
+				return MOSQ_ERR_PROTOCOL;
+			}
+			break;
+
+		case MQTT_PROP_WILL_DELAY_INTERVAL:
+			if(command != CMD_WILL){
+				return MOSQ_ERR_PROTOCOL;
+			}
+			break;
+
+		case MQTT_PROP_REQUEST_PROBLEM_INFORMATION:
+		case MQTT_PROP_REQUEST_RESPONSE_INFORMATION:
+			if(command != CMD_CONNECT){
+				return MOSQ_ERR_PROTOCOL;
+			}
+			break;
+
+		case MQTT_PROP_SERVER_REFERENCE:
+			if(command != CMD_CONNACK && command != CMD_DISCONNECT){
+				return MOSQ_ERR_PROTOCOL;
+			}
+			break;
+
+		case MQTT_PROP_REASON_STRING:
+			if(command == CMD_CONNECT || command == CMD_PUBLISH || command == CMD_SUBSCRIBE || command == CMD_UNSUBSCRIBE){
+				return MOSQ_ERR_PROTOCOL;
+			}
+			break;
+
+		case MQTT_PROP_RECEIVE_MAXIMUM:
+		case MQTT_PROP_TOPIC_ALIAS_MAXIMUM:
+		case MQTT_PROP_MAXIMUM_PACKET_SIZE:
+			if(command != CMD_CONNECT && command != CMD_CONNACK){
+				return MOSQ_ERR_PROTOCOL;
+			}
+			break;
+
+		case MQTT_PROP_TOPIC_ALIAS:
+			if(command != CMD_PUBLISH){
+				return MOSQ_ERR_PROTOCOL;
+			}
+			break;
+
+		case MQTT_PROP_USER_PROPERTY:
+			break;
+
+		default:
+			return MOSQ_ERR_PROTOCOL;
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int mosquitto_string_to_property_info(const char *propname, int *identifier, int *type)
+{
+	if(!propname) return MOSQ_ERR_INVAL;
+
+	if(!strcasecmp(propname, "payload-format-indicator")){
+		*identifier = MQTT_PROP_PAYLOAD_FORMAT_INDICATOR;
+		*type = MQTT_PROP_TYPE_BYTE;
+	}else if(!strcasecmp(propname, "message-expiry-interval")){
+		*identifier = MQTT_PROP_MESSAGE_EXPIRY_INTERVAL;
+		*type = MQTT_PROP_TYPE_INT32;
+	}else if(!strcasecmp(propname, "content-type")){
+		*identifier = MQTT_PROP_CONTENT_TYPE;
+		*type = MQTT_PROP_TYPE_STRING;
+	}else if(!strcasecmp(propname, "response-topic")){
+		*identifier = MQTT_PROP_RESPONSE_TOPIC;
+		*type = MQTT_PROP_TYPE_STRING;
+	}else if(!strcasecmp(propname, "correlation-data")){
+		*identifier = MQTT_PROP_CORRELATION_DATA;
+		*type = MQTT_PROP_TYPE_BINARY;
+	}else if(!strcasecmp(propname, "subscription-identifier")){
+		*identifier = MQTT_PROP_SUBSCRIPTION_IDENTIFIER;
+		*type = MQTT_PROP_TYPE_VARINT;
+	}else if(!strcasecmp(propname, "session-expiry-interval")){
+		*identifier = MQTT_PROP_SESSION_EXPIRY_INTERVAL;
+		*type = MQTT_PROP_TYPE_INT32;
+	}else if(!strcasecmp(propname, "assigned-client-identifier")){
+		*identifier = MQTT_PROP_ASSIGNED_CLIENT_IDENTIFIER;
+		*type = MQTT_PROP_TYPE_STRING;
+	}else if(!strcasecmp(propname, "server-keep-alive")){
+		*identifier = MQTT_PROP_SERVER_KEEP_ALIVE;
+		*type = MQTT_PROP_TYPE_INT16;
+	}else if(!strcasecmp(propname, "authentication-method")){
+		*identifier = MQTT_PROP_AUTHENTICATION_METHOD;
+		*type = MQTT_PROP_TYPE_STRING;
+	}else if(!strcasecmp(propname, "authentication-data")){
+		*identifier = MQTT_PROP_AUTHENTICATION_DATA;
+		*type = MQTT_PROP_TYPE_BINARY;
+	}else if(!strcasecmp(propname, "request-problem-information")){
+		*identifier = MQTT_PROP_REQUEST_PROBLEM_INFORMATION;
+		*type = MQTT_PROP_TYPE_BYTE;
+	}else if(!strcasecmp(propname, "will-delay-interval")){
+		*identifier = MQTT_PROP_WILL_DELAY_INTERVAL;
+		*type = MQTT_PROP_TYPE_INT32;
+	}else if(!strcasecmp(propname, "request-response-information")){
+		*identifier = MQTT_PROP_REQUEST_RESPONSE_INFORMATION;
+		*type = MQTT_PROP_TYPE_BYTE;
+	}else if(!strcasecmp(propname, "response-information")){
+		*identifier = MQTT_PROP_RESPONSE_INFORMATION;
+		*type = MQTT_PROP_TYPE_STRING;
+	}else if(!strcasecmp(propname, "server-reference")){
+		*identifier = MQTT_PROP_SERVER_REFERENCE;
+		*type = MQTT_PROP_TYPE_STRING;
+	}else if(!strcasecmp(propname, "reason-string")){
+		*identifier = MQTT_PROP_REASON_STRING;
+		*type = MQTT_PROP_TYPE_STRING;
+	}else if(!strcasecmp(propname, "receive-maximum")){
+		*identifier = MQTT_PROP_RECEIVE_MAXIMUM;
+		*type = MQTT_PROP_TYPE_INT16;
+	}else if(!strcasecmp(propname, "topic-alias-maximum")){
+		*identifier = MQTT_PROP_TOPIC_ALIAS_MAXIMUM;
+		*type = MQTT_PROP_TYPE_INT16;
+	}else if(!strcasecmp(propname, "topic-alias")){
+		*identifier = MQTT_PROP_TOPIC_ALIAS;
+		*type = MQTT_PROP_TYPE_INT16;
+	}else if(!strcasecmp(propname, "maximum-qos")){
+		*identifier = MQTT_PROP_MAXIMUM_QOS;
+		*type = MQTT_PROP_TYPE_BYTE;
+	}else if(!strcasecmp(propname, "retain-available")){
+		*identifier = MQTT_PROP_RETAIN_AVAILABLE;
+		*type = MQTT_PROP_TYPE_BYTE;
+	}else if(!strcasecmp(propname, "user-property")){
+		*identifier = MQTT_PROP_USER_PROPERTY;
+		*type = MQTT_PROP_TYPE_STRING_PAIR;
+	}else if(!strcasecmp(propname, "maximum-packet-size")){
+		*identifier = MQTT_PROP_MAXIMUM_PACKET_SIZE;
+		*type = MQTT_PROP_TYPE_INT32;
+	}else if(!strcasecmp(propname, "wildcard-subscription-available")){
+		*identifier = MQTT_PROP_WILDCARD_SUB_AVAILABLE;
+		*type = MQTT_PROP_TYPE_BYTE;
+	}else if(!strcasecmp(propname, "subscription-identifier-available")){
+		*identifier = MQTT_PROP_SUBSCRIPTION_ID_AVAILABLE;
+		*type = MQTT_PROP_TYPE_BYTE;
+	}else if(!strcasecmp(propname, "shared-subscription-available")){
+		*identifier = MQTT_PROP_SHARED_SUB_AVAILABLE;
+		*type = MQTT_PROP_TYPE_BYTE;
+	}else{
+		return MOSQ_ERR_INVAL;
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+static void property__add(mosquitto_property **proplist, struct mqtt5__property *prop)
+{
+	mosquitto_property *p;
+
+	if(!(*proplist)){
+		*proplist = prop;
+	}
+
+	p = *proplist;
+	while(p->next){
+		p = p->next;
+	}
+	p->next = prop;
+	prop->next = NULL;
+}
+
+
+int mosquitto_property_add_byte(mosquitto_property **proplist, int identifier, uint8_t value)
+{
+	mosquitto_property *prop;
+
+	if(!proplist) return MOSQ_ERR_INVAL;
+	if(identifier != MQTT_PROP_PAYLOAD_FORMAT_INDICATOR
+			&& identifier != MQTT_PROP_REQUEST_PROBLEM_INFORMATION
+			&& identifier != MQTT_PROP_REQUEST_RESPONSE_INFORMATION
+			&& identifier != MQTT_PROP_MAXIMUM_QOS
+			&& identifier != MQTT_PROP_RETAIN_AVAILABLE
+			&& identifier != MQTT_PROP_WILDCARD_SUB_AVAILABLE
+			&& identifier != MQTT_PROP_SUBSCRIPTION_ID_AVAILABLE
+			&& identifier != MQTT_PROP_SHARED_SUB_AVAILABLE){
+		return MOSQ_ERR_INVAL;
+	}
+
+	prop = mosquitto__calloc(1, sizeof(mosquitto_property));
+	if(!prop) return MOSQ_ERR_NOMEM;
+
+	prop->client_generated = true;
+	prop->identifier = identifier;
+	prop->value.i8 = value;
+
+	property__add(proplist, prop);
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int mosquitto_property_add_int16(mosquitto_property **proplist, int identifier, uint16_t value)
+{
+	mosquitto_property *prop;
+
+	if(!proplist) return MOSQ_ERR_INVAL;
+	if(identifier != MQTT_PROP_SERVER_KEEP_ALIVE
+			&& identifier != MQTT_PROP_RECEIVE_MAXIMUM
+			&& identifier != MQTT_PROP_TOPIC_ALIAS_MAXIMUM
+			&& identifier != MQTT_PROP_TOPIC_ALIAS){
+		return MOSQ_ERR_INVAL;
+	}
+
+	prop = mosquitto__calloc(1, sizeof(mosquitto_property));
+	if(!prop) return MOSQ_ERR_NOMEM;
+
+	prop->client_generated = true;
+	prop->identifier = identifier;
+	prop->value.i16 = value;
+
+	property__add(proplist, prop);
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int mosquitto_property_add_int32(mosquitto_property **proplist, int identifier, uint32_t value)
+{
+	mosquitto_property *prop;
+
+	if(!proplist) return MOSQ_ERR_INVAL;
+	if(identifier != MQTT_PROP_MESSAGE_EXPIRY_INTERVAL
+			&& identifier != MQTT_PROP_SESSION_EXPIRY_INTERVAL
+			&& identifier != MQTT_PROP_WILL_DELAY_INTERVAL
+			&& identifier != MQTT_PROP_MAXIMUM_PACKET_SIZE){
+
+		return MOSQ_ERR_INVAL;
+	}
+
+	prop = mosquitto__calloc(1, sizeof(mosquitto_property));
+	if(!prop) return MOSQ_ERR_NOMEM;
+
+	prop->client_generated = true;
+	prop->identifier = identifier;
+	prop->value.i32 = value;
+
+	property__add(proplist, prop);
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int mosquitto_property_add_varint(mosquitto_property **proplist, int identifier, uint32_t value)
+{
+	mosquitto_property *prop;
+
+	if(!proplist || value > 268435455) return MOSQ_ERR_INVAL;
+	if(identifier != MQTT_PROP_SUBSCRIPTION_IDENTIFIER) return MOSQ_ERR_INVAL;
+
+	prop = mosquitto__calloc(1, sizeof(mosquitto_property));
+	if(!prop) return MOSQ_ERR_NOMEM;
+
+	prop->client_generated = true;
+	prop->identifier = identifier;
+	prop->value.varint = value;
+
+	property__add(proplist, prop);
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int mosquitto_property_add_binary(mosquitto_property **proplist, int identifier, const void *value, uint16_t len)
+{
+	mosquitto_property *prop;
+
+	if(!proplist) return MOSQ_ERR_INVAL;
+	if(identifier != MQTT_PROP_CORRELATION_DATA
+			&& identifier != MQTT_PROP_AUTHENTICATION_DATA){
+
+		return MOSQ_ERR_INVAL;
+	}
+
+	prop = mosquitto__calloc(1, sizeof(mosquitto_property));
+	if(!prop) return MOSQ_ERR_NOMEM;
+
+	prop->client_generated = true;
+	prop->identifier = identifier;
+
+	if(len){
+		prop->value.bin.v = mosquitto__malloc(len);
+		if(!prop->value.bin.v){
+			mosquitto__free(prop);
+			return MOSQ_ERR_NOMEM;
+		}
+
+		memcpy(prop->value.bin.v, value, len);
+		prop->value.bin.len = len;
+	}
+
+	property__add(proplist, prop);
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int mosquitto_property_add_string(mosquitto_property **proplist, int identifier, const char *value)
+{
+	mosquitto_property *prop;
+
+	if(!proplist) return MOSQ_ERR_INVAL;
+	if(value){
+		if(mosquitto_validate_utf8(value, strlen(value))) return MOSQ_ERR_MALFORMED_UTF8;
+	}
+
+	if(identifier != MQTT_PROP_CONTENT_TYPE
+			&& identifier != MQTT_PROP_RESPONSE_TOPIC
+			&& identifier != MQTT_PROP_ASSIGNED_CLIENT_IDENTIFIER
+			&& identifier != MQTT_PROP_AUTHENTICATION_METHOD
+			&& identifier != MQTT_PROP_RESPONSE_INFORMATION
+			&& identifier != MQTT_PROP_SERVER_REFERENCE
+			&& identifier != MQTT_PROP_REASON_STRING){
+
+		return MOSQ_ERR_INVAL;
+	}
+
+	prop = mosquitto__calloc(1, sizeof(mosquitto_property));
+	if(!prop) return MOSQ_ERR_NOMEM;
+
+	prop->client_generated = true;
+	prop->identifier = identifier;
+	if(value && strlen(value)){
+		prop->value.s.v = mosquitto__strdup(value);
+		if(!prop->value.s.v){
+			mosquitto__free(prop);
+			return MOSQ_ERR_NOMEM;
+		}
+		prop->value.s.len = strlen(value);
+	}
+
+	property__add(proplist, prop);
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int mosquitto_property_add_string_pair(mosquitto_property **proplist, int identifier, const char *name, const char *value)
+{
+	mosquitto_property *prop;
+
+	if(!proplist) return MOSQ_ERR_INVAL;
+	if(identifier != MQTT_PROP_USER_PROPERTY) return MOSQ_ERR_INVAL;
+	if(name){
+		if(mosquitto_validate_utf8(name, strlen(name))) return MOSQ_ERR_MALFORMED_UTF8;
+	}
+	if(value){
+		if(mosquitto_validate_utf8(value, strlen(value))) return MOSQ_ERR_MALFORMED_UTF8;
+	}
+
+	prop = mosquitto__calloc(1, sizeof(mosquitto_property));
+	if(!prop) return MOSQ_ERR_NOMEM;
+
+	prop->client_generated = true;
+	prop->identifier = identifier;
+
+	if(name && strlen(name)){
+		prop->name.v = mosquitto__strdup(name);
+		if(!prop->name.v){
+			mosquitto__free(prop);
+			return MOSQ_ERR_NOMEM;
+		}
+		prop->name.len = strlen(name);
+	}
+
+	if(value && strlen(value)){
+		prop->value.s.v = mosquitto__strdup(value);
+		if(!prop->value.s.v){
+			mosquitto__free(prop->name.v);
+			mosquitto__free(prop);
+			return MOSQ_ERR_NOMEM;
+		}
+		prop->value.s.len = strlen(value);
+	}
+
+	property__add(proplist, prop);
+	return MOSQ_ERR_SUCCESS;
+}
+
+int mosquitto_property_check_all(int command, const mosquitto_property *properties)
+{
+	const mosquitto_property *p, *tail;
+	int rc;
+
+	p = properties;
+
+	while(p){
+		/* Validity checks */
+		if(p->identifier == MQTT_PROP_REQUEST_PROBLEM_INFORMATION
+				|| p->identifier == MQTT_PROP_REQUEST_RESPONSE_INFORMATION
+				|| p->identifier == MQTT_PROP_MAXIMUM_QOS
+				|| p->identifier == MQTT_PROP_RETAIN_AVAILABLE
+				|| p->identifier == MQTT_PROP_WILDCARD_SUB_AVAILABLE
+				|| p->identifier == MQTT_PROP_SUBSCRIPTION_ID_AVAILABLE
+				|| p->identifier == MQTT_PROP_SHARED_SUB_AVAILABLE){
+
+			if(p->value.i8 > 1){
+				return MOSQ_ERR_PROTOCOL;
+			}
+		}else if(p->identifier == MQTT_PROP_MAXIMUM_PACKET_SIZE){
+			if( p->value.i32 == 0){
+				return MOSQ_ERR_PROTOCOL;
+			}
+		}else if(p->identifier == MQTT_PROP_RECEIVE_MAXIMUM
+				|| p->identifier == MQTT_PROP_TOPIC_ALIAS){
+
+			if(p->value.i16 == 0){
+				return MOSQ_ERR_PROTOCOL;
+			}
+		}
+
+		/* Check for properties on incorrect commands */
+		rc = mosquitto_property_check_command(command, p->identifier);
+		if(rc) return rc;
+
+		/* Check for duplicates */
+		tail = p->next;
+		while(tail){
+			if(p->identifier == tail->identifier
+					&& p->identifier != MQTT_PROP_USER_PROPERTY){
+
+				return MOSQ_ERR_DUPLICATE_PROPERTY;
+			}
+			tail = tail->next;
+		}
+
+		p = p->next;
+	}
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+const mosquitto_property *property__get_property(const mosquitto_property *proplist, int identifier, bool skip_first)
+{
+	const mosquitto_property *p;
+	bool is_first = true;
+
+	p = proplist;
+
+	while(p){
+		if(p->identifier == identifier){
+			if(!is_first || !skip_first){
+				return p;
+			}
+			is_first = false;
+		}
+		p = p->next;
+	}
+	return NULL;
+}
+
+
+const mosquitto_property *mosquitto_property_read_byte(const mosquitto_property *proplist, int identifier, uint8_t *value, bool skip_first)
+{
+	const mosquitto_property *p;
+	if(!proplist) return NULL;
+
+	p = property__get_property(proplist, identifier, skip_first);
+	if(!p) return NULL;
+	if(p->identifier != MQTT_PROP_PAYLOAD_FORMAT_INDICATOR
+			&& p->identifier != MQTT_PROP_REQUEST_PROBLEM_INFORMATION
+			&& p->identifier != MQTT_PROP_REQUEST_RESPONSE_INFORMATION
+			&& p->identifier != MQTT_PROP_MAXIMUM_QOS
+			&& p->identifier != MQTT_PROP_RETAIN_AVAILABLE
+			&& p->identifier != MQTT_PROP_WILDCARD_SUB_AVAILABLE
+			&& p->identifier != MQTT_PROP_SUBSCRIPTION_ID_AVAILABLE
+			&& p->identifier != MQTT_PROP_SHARED_SUB_AVAILABLE){
+		return NULL;
+	}
+
+	if(value) *value = p->value.i8;
+
+	return p;
+}
+
+
+const mosquitto_property *mosquitto_property_read_int16(const mosquitto_property *proplist, int identifier, uint16_t *value, bool skip_first)
+{
+	const mosquitto_property *p;
+	if(!proplist) return NULL;
+
+	p = property__get_property(proplist, identifier, skip_first);
+	if(!p) return NULL;
+	if(p->identifier != MQTT_PROP_SERVER_KEEP_ALIVE
+			&& p->identifier != MQTT_PROP_RECEIVE_MAXIMUM
+			&& p->identifier != MQTT_PROP_TOPIC_ALIAS_MAXIMUM
+			&& p->identifier != MQTT_PROP_TOPIC_ALIAS){
+		return NULL;
+	}
+
+	if(value) *value = p->value.i16;
+
+	return p;
+}
+
+
+const mosquitto_property *mosquitto_property_read_int32(const mosquitto_property *proplist, int identifier, uint32_t *value, bool skip_first)
+{
+	const mosquitto_property *p;
+	if(!proplist) return NULL;
+
+	p = property__get_property(proplist, identifier, skip_first);
+	if(!p) return NULL;
+	if(p->identifier != MQTT_PROP_MESSAGE_EXPIRY_INTERVAL
+			&& p->identifier != MQTT_PROP_SESSION_EXPIRY_INTERVAL
+			&& p->identifier != MQTT_PROP_WILL_DELAY_INTERVAL
+			&& p->identifier != MQTT_PROP_MAXIMUM_PACKET_SIZE){
+
+		return NULL;
+	}
+
+	if(value) *value = p->value.i32;
+
+	return p;
+}
+
+
+const mosquitto_property *mosquitto_property_read_varint(const mosquitto_property *proplist, int identifier, uint32_t *value, bool skip_first)
+{
+	const mosquitto_property *p;
+	if(!proplist) return NULL;
+
+	p = property__get_property(proplist, identifier, skip_first);
+	if(!p) return NULL;
+	if(p->identifier != MQTT_PROP_SUBSCRIPTION_IDENTIFIER){
+		return NULL;
+	}
+
+	if(value) *value = p->value.varint;
+
+	return p;
+}
+
+
+const mosquitto_property *mosquitto_property_read_binary(const mosquitto_property *proplist, int identifier, void **value, uint16_t *len, bool skip_first)
+{
+	const mosquitto_property *p;
+	if(!proplist || (value && !len) || (!value && len)) return NULL;
+
+	p = property__get_property(proplist, identifier, skip_first);
+	if(!p) return NULL;
+	if(p->identifier != MQTT_PROP_CORRELATION_DATA
+			&& p->identifier != MQTT_PROP_AUTHENTICATION_DATA){
+
+		return NULL;
+	}
+
+	if(value){
+		*len = p->value.bin.len;
+		*value = malloc(*len);
+		if(!(*value)) return NULL;
+
+		memcpy(*value, p->value.bin.v, *len);
+	}
+
+	return p;
+}
+
+
+const mosquitto_property *mosquitto_property_read_string(const mosquitto_property *proplist, int identifier, char **value, bool skip_first)
+{
+	const mosquitto_property *p;
+	if(!proplist) return NULL;
+
+	p = property__get_property(proplist, identifier, skip_first);
+	if(!p) return NULL;
+	if(p->identifier != MQTT_PROP_CONTENT_TYPE
+			&& p->identifier != MQTT_PROP_RESPONSE_TOPIC
+			&& p->identifier != MQTT_PROP_ASSIGNED_CLIENT_IDENTIFIER
+			&& p->identifier != MQTT_PROP_AUTHENTICATION_METHOD
+			&& p->identifier != MQTT_PROP_RESPONSE_INFORMATION
+			&& p->identifier != MQTT_PROP_SERVER_REFERENCE
+			&& p->identifier != MQTT_PROP_REASON_STRING){
+
+		return NULL;
+	}
+
+	if(value){
+		*value = calloc(1, p->value.s.len+1);
+		if(!(*value)) return NULL;
+
+		memcpy(*value, p->value.s.v, p->value.s.len);
+	}
+
+	return p;
+}
+
+
+const mosquitto_property *mosquitto_property_read_string_pair(const mosquitto_property *proplist, int identifier, char **name, char **value, bool skip_first)
+{
+	const mosquitto_property *p;
+	if(!proplist) return NULL;
+
+	p = property__get_property(proplist, identifier, skip_first);
+	if(!p) return NULL;
+	if(p->identifier != MQTT_PROP_USER_PROPERTY) return NULL;
+
+	if(name){
+		*name = calloc(1, p->name.len+1);
+		if(!(*name)) return NULL;
+		memcpy(*name, p->name.v, p->name.len);
+	}
+
+	if(value){
+		*value = calloc(1, p->value.s.len+1);
+		if(!(*value)){
+			if(name) free(*name);
+			return NULL;
+		}
+		memcpy(*value, p->value.s.v, p->value.s.len);
+	}
+
+	return p;
+}
+
+
+int mosquitto_property_copy_all(mosquitto_property **dest, const mosquitto_property *src)
+{
+	mosquitto_property *pnew, *plast = NULL;
+
+	if(!src) return MOSQ_ERR_SUCCESS;
+	if(!dest) return MOSQ_ERR_INVAL;
+
+	*dest = NULL;
+
+	while(src){
+		pnew = calloc(1, sizeof(mosquitto_property));
+		if(!pnew){
+			mosquitto_property_free_all(dest);
+			return MOSQ_ERR_NOMEM;
+		}
+		if(plast){
+			plast->next = pnew;
+		}else{
+			*dest = pnew;
+		}
+		plast = pnew;
+
+		pnew->identifier = src->identifier;
+		switch(pnew->identifier){
+			case MQTT_PROP_PAYLOAD_FORMAT_INDICATOR:
+			case MQTT_PROP_REQUEST_PROBLEM_INFORMATION:
+			case MQTT_PROP_REQUEST_RESPONSE_INFORMATION:
+			case MQTT_PROP_MAXIMUM_QOS:
+			case MQTT_PROP_RETAIN_AVAILABLE:
+			case MQTT_PROP_WILDCARD_SUB_AVAILABLE:
+			case MQTT_PROP_SUBSCRIPTION_ID_AVAILABLE:
+			case MQTT_PROP_SHARED_SUB_AVAILABLE:
+				pnew->value.i8 = src->value.i8;
+				break;
+
+			case MQTT_PROP_SERVER_KEEP_ALIVE:
+			case MQTT_PROP_RECEIVE_MAXIMUM:
+			case MQTT_PROP_TOPIC_ALIAS_MAXIMUM:
+			case MQTT_PROP_TOPIC_ALIAS:
+				pnew->value.i16 = src->value.i16;
+				break;
+
+			case MQTT_PROP_MESSAGE_EXPIRY_INTERVAL:
+			case MQTT_PROP_SESSION_EXPIRY_INTERVAL:
+			case MQTT_PROP_WILL_DELAY_INTERVAL:
+			case MQTT_PROP_MAXIMUM_PACKET_SIZE:
+				pnew->value.i32 = src->value.i32;
+				break;
+
+			case MQTT_PROP_SUBSCRIPTION_IDENTIFIER:
+				pnew->value.varint = src->value.varint;
+				break;
+
+			case MQTT_PROP_CONTENT_TYPE:
+			case MQTT_PROP_RESPONSE_TOPIC:
+			case MQTT_PROP_ASSIGNED_CLIENT_IDENTIFIER:
+			case MQTT_PROP_AUTHENTICATION_METHOD:
+			case MQTT_PROP_RESPONSE_INFORMATION:
+			case MQTT_PROP_SERVER_REFERENCE:
+			case MQTT_PROP_REASON_STRING:
+				pnew->value.s.len = src->value.s.len;
+				pnew->value.s.v = strdup(src->value.s.v);
+				if(!pnew->value.s.v){
+					mosquitto_property_free_all(dest);
+					return MOSQ_ERR_NOMEM;
+				}
+				break;
+
+			case MQTT_PROP_AUTHENTICATION_DATA:
+			case MQTT_PROP_CORRELATION_DATA:
+				pnew->value.bin.len = src->value.bin.len;
+				pnew->value.bin.v = malloc(pnew->value.bin.len);
+				if(!pnew->value.bin.v){
+					mosquitto_property_free_all(dest);
+					return MOSQ_ERR_NOMEM;
+				}
+				memcpy(pnew->value.bin.v, src->value.bin.v, pnew->value.bin.len);
+				break;
+
+			case MQTT_PROP_USER_PROPERTY:
+				pnew->value.s.len = src->value.s.len;
+				pnew->value.s.v = strdup(src->value.s.v);
+				if(!pnew->value.s.v){
+					mosquitto_property_free_all(dest);
+					return MOSQ_ERR_NOMEM;
+				}
+
+				pnew->name.len = src->name.len;
+				pnew->name.v = strdup(src->name.v);
+				if(!pnew->name.v){
+					mosquitto_property_free_all(dest);
+					return MOSQ_ERR_NOMEM;
+				}
+				break;
+
+			default:
+				mosquitto_property_free_all(dest);
+				return MOSQ_ERR_INVAL;
+		}
+
+		src = src->next;
+	}
+
+	return MOSQ_ERR_SUCCESS;
+}
diff --git a/libs/libmosquitto/src/property_mosq.h b/libs/libmosquitto/src/property_mosq.h
new file mode 100644
index 0000000000..d965d8a3e6
--- /dev/null
+++ b/libs/libmosquitto/src/property_mosq.h
@@ -0,0 +1,50 @@
+/*
+Copyright (c) 2018 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+#ifndef PROPERTY_MOSQ_H
+#define PROPERTY_MOSQ_H
+
+#include "mosquitto_internal.h"
+#include "mosquitto.h"
+
+struct mqtt__string {
+	char *v;
+	int len;
+};
+
+struct mqtt5__property {
+	struct mqtt5__property *next;
+	union {
+		uint8_t i8;
+		uint16_t i16;
+		uint32_t i32;
+		uint32_t varint;
+		struct mqtt__string bin;
+		struct mqtt__string s;
+	} value;
+	struct mqtt__string name;
+	int32_t identifier;
+	bool client_generated;
+};
+
+
+int property__read_all(int command, struct mosquitto__packet *packet, mosquitto_property **property);
+int property__write_all(struct mosquitto__packet *packet, const mosquitto_property *property, bool write_len);
+void property__free(mosquitto_property **property);
+
+int property__get_length(const mosquitto_property *property);
+int property__get_length_all(const mosquitto_property *property);
+
+#endif
diff --git a/libs/libmosquitto/src/read_handle.c b/libs/libmosquitto/src/read_handle.c
new file mode 100644
index 0000000000..19c0c35b1e
--- /dev/null
+++ b/libs/libmosquitto/src/read_handle.c
@@ -0,0 +1,70 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "mosquitto.h"
+#include "logging_mosq.h"
+#include "memory_mosq.h"
+#include "messages_mosq.h"
+#include "mqtt_protocol.h"
+#include "net_mosq.h"
+#include "packet_mosq.h"
+#include "read_handle.h"
+#include "send_mosq.h"
+#include "time_mosq.h"
+#include "util_mosq.h"
+
+int handle__packet(struct mosquitto *mosq)
+{
+	assert(mosq);
+
+	switch((mosq->in_packet.command)&0xF0){
+		case CMD_PINGREQ:
+			return handle__pingreq(mosq);
+		case CMD_PINGRESP:
+			return handle__pingresp(mosq);
+		case CMD_PUBACK:
+			return handle__pubackcomp(mosq, "PUBACK");
+		case CMD_PUBCOMP:
+			return handle__pubackcomp(mosq, "PUBCOMP");
+		case CMD_PUBLISH:
+			return handle__publish(mosq);
+		case CMD_PUBREC:
+			return handle__pubrec(NULL, mosq);
+		case CMD_PUBREL:
+			return handle__pubrel(NULL, mosq);
+		case CMD_CONNACK:
+			return handle__connack(mosq);
+		case CMD_SUBACK:
+			return handle__suback(mosq);
+		case CMD_UNSUBACK:
+			return handle__unsuback(mosq);
+		case CMD_DISCONNECT:
+			return handle__disconnect(mosq);
+		case CMD_AUTH:
+			return handle__auth(mosq);
+		default:
+			/* If we don't recognise the command, return an error straight away. */
+			log__printf(mosq, MOSQ_LOG_ERR, "Error: Unrecognised command %d\n", (mosq->in_packet.command)&0xF0);
+			return MOSQ_ERR_PROTOCOL;
+	}
+}
+
diff --git a/libs/libmosquitto/src/read_handle.h b/libs/libmosquitto/src/read_handle.h
new file mode 100644
index 0000000000..2a6936d817
--- /dev/null
+++ b/libs/libmosquitto/src/read_handle.h
@@ -0,0 +1,40 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+#ifndef READ_HANDLE_H
+#define READ_HANDLE_H
+
+#include "mosquitto.h"
+struct mosquitto_db;
+
+int handle__pingreq(struct mosquitto *mosq);
+int handle__pingresp(struct mosquitto *mosq);
+#ifdef WITH_BROKER
+int handle__pubackcomp(struct mosquitto_db *db, struct mosquitto *mosq, const char *type);
+#else
+int handle__packet(struct mosquitto *mosq);
+int handle__connack(struct mosquitto *mosq);
+int handle__disconnect(struct mosquitto *mosq);
+int handle__pubackcomp(struct mosquitto *mosq, const char *type);
+int handle__publish(struct mosquitto *mosq);
+int handle__auth(struct mosquitto *mosq);
+#endif
+int handle__pubrec(struct mosquitto_db *db, struct mosquitto *mosq);
+int handle__pubrel(struct mosquitto_db *db, struct mosquitto *mosq);
+int handle__suback(struct mosquitto *mosq);
+int handle__unsuback(struct mosquitto *mosq);
+
+
+#endif
diff --git a/libs/libmosquitto/src/send_connect.c b/libs/libmosquitto/src/send_connect.c
new file mode 100644
index 0000000000..210f125a80
--- /dev/null
+++ b/libs/libmosquitto/src/send_connect.c
@@ -0,0 +1,204 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <string.h>
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#endif
+
+#include "logging_mosq.h"
+#include "memory_mosq.h"
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+#include "mqtt_protocol.h"
+#include "packet_mosq.h"
+#include "property_mosq.h"
+
+int send__connect(struct mosquitto *mosq, uint16_t keepalive, bool clean_session, const mosquitto_property *properties)
+{
+	struct mosquitto__packet *packet = NULL;
+	int payloadlen;
+	uint8_t will = 0;
+	uint8_t byte;
+	int rc;
+	uint8_t version;
+	char *clientid, *username, *password;
+	int headerlen;
+	int proplen = 0, will_proplen, varbytes;
+	mosquitto_property *local_props = NULL;
+	uint16_t receive_maximum;
+
+	assert(mosq);
+
+	if(mosq->protocol == mosq_p_mqtt31 && !mosq->id) return MOSQ_ERR_PROTOCOL;
+
+#if defined(WITH_BROKER) && defined(WITH_BRIDGE)
+	if(mosq->bridge){
+		clientid = mosq->bridge->remote_clientid;
+		username = mosq->bridge->remote_username;
+		password = mosq->bridge->remote_password;
+	}else{
+		clientid = mosq->id;
+		username = mosq->username;
+		password = mosq->password;
+	}
+#else
+	clientid = mosq->id;
+	username = mosq->username;
+	password = mosq->password;
+#endif
+
+	if(mosq->protocol == mosq_p_mqtt5){
+		/* Generate properties from options */
+		if(!mosquitto_property_read_int16(properties, MQTT_PROP_RECEIVE_MAXIMUM, &receive_maximum, false)){
+			rc = mosquitto_property_add_int16(&local_props, MQTT_PROP_RECEIVE_MAXIMUM, mosq->msgs_in.inflight_maximum);
+			if(rc) return rc;
+		}else{
+			mosq->msgs_in.inflight_maximum = receive_maximum;
+			mosq->msgs_in.inflight_quota = receive_maximum;
+		}
+
+		version = MQTT_PROTOCOL_V5;
+		headerlen = 10;
+		proplen = 0;
+		proplen += property__get_length_all(properties);
+		proplen += property__get_length_all(local_props);
+		varbytes = packet__varint_bytes(proplen);
+		headerlen += proplen + varbytes;
+	}else if(mosq->protocol == mosq_p_mqtt311){
+		version = MQTT_PROTOCOL_V311;
+		headerlen = 10;
+	}else if(mosq->protocol == mosq_p_mqtt31){
+		version = MQTT_PROTOCOL_V31;
+		headerlen = 12;
+	}else{
+		return MOSQ_ERR_INVAL;
+	}
+
+	packet = mosquitto__calloc(1, sizeof(struct mosquitto__packet));
+	if(!packet) return MOSQ_ERR_NOMEM;
+
+	if(clientid){
+		payloadlen = 2+strlen(clientid);
+	}else{
+		payloadlen = 2;
+	}
+	if(mosq->will){
+		will = 1;
+		assert(mosq->will->msg.topic);
+
+		payloadlen += 2+strlen(mosq->will->msg.topic) + 2+mosq->will->msg.payloadlen;
+		if(mosq->protocol == mosq_p_mqtt5){
+			will_proplen = property__get_length_all(mosq->will->properties);
+			varbytes = packet__varint_bytes(will_proplen);
+			payloadlen += will_proplen + varbytes;
+		}
+	}
+
+	/* After this check we can be sure that the username and password are
+	 * always valid for the current protocol, so there is no need to check
+	 * username before checking password. */
+	if(mosq->protocol == mosq_p_mqtt31 || mosq->protocol == mosq_p_mqtt311){
+		if(password != NULL && username == NULL){
+			return MOSQ_ERR_INVAL;
+		}
+	}
+
+	if(username){
+		payloadlen += 2+strlen(username);
+	}
+	if(password){
+		payloadlen += 2+strlen(password);
+	}
+
+	packet->command = CMD_CONNECT;
+	packet->remaining_length = headerlen + payloadlen;
+	rc = packet__alloc(packet);
+	if(rc){
+		mosquitto__free(packet);
+		return rc;
+	}
+
+	/* Variable header */
+	if(version == MQTT_PROTOCOL_V31){
+		packet__write_string(packet, PROTOCOL_NAME_v31, strlen(PROTOCOL_NAME_v31));
+	}else{
+		packet__write_string(packet, PROTOCOL_NAME, strlen(PROTOCOL_NAME));
+	}
+#if defined(WITH_BROKER) && defined(WITH_BRIDGE)
+	if(mosq->bridge && mosq->bridge->try_private && mosq->bridge->try_private_accepted){
+		version |= 0x80;
+	}else{
+	}
+#endif
+	packet__write_byte(packet, version);
+	byte = (clean_session&0x1)<<1;
+	if(will){
+		byte = byte | ((mosq->will->msg.retain&0x1)<<5) | ((mosq->will->msg.qos&0x3)<<3) | ((will&0x1)<<2);
+	}
+	if(username){
+		byte = byte | 0x1<<7;
+	}
+	if(mosq->password){
+		byte = byte | 0x1<<6;
+	}
+	packet__write_byte(packet, byte);
+	packet__write_uint16(packet, keepalive);
+
+	if(mosq->protocol == mosq_p_mqtt5){
+		/* Write properties */
+		packet__write_varint(packet, proplen);
+		property__write_all(packet, properties, false);
+		property__write_all(packet, local_props, false);
+	}
+
+	/* Payload */
+	if(clientid){
+		packet__write_string(packet, clientid, strlen(clientid));
+	}else{
+		packet__write_uint16(packet, 0);
+	}
+	if(will){
+		if(mosq->protocol == mosq_p_mqtt5){
+			/* Write will properties */
+			property__write_all(packet, mosq->will->properties, true);
+		}
+		packet__write_string(packet, mosq->will->msg.topic, strlen(mosq->will->msg.topic));
+		packet__write_string(packet, (const char *)mosq->will->msg.payload, mosq->will->msg.payloadlen);
+	}
+
+	if(username){
+		packet__write_string(packet, username, strlen(username));
+	}
+	if(password){
+		packet__write_string(packet, password, strlen(password));
+	}
+
+	mosq->keepalive = keepalive;
+#ifdef WITH_BROKER
+# ifdef WITH_BRIDGE
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Bridge %s sending CONNECT", clientid);
+# endif
+#else
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s sending CONNECT", clientid);
+#endif
+	return packet__queue(mosq, packet);
+}
+
diff --git a/libs/libmosquitto/src/send_disconnect.c b/libs/libmosquitto/src/send_disconnect.c
new file mode 100644
index 0000000000..3598988755
--- /dev/null
+++ b/libs/libmosquitto/src/send_disconnect.c
@@ -0,0 +1,85 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#endif
+
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+#include "logging_mosq.h"
+#include "memory_mosq.h"
+#include "mqtt_protocol.h"
+#include "packet_mosq.h"
+#include "property_mosq.h"
+#include "send_mosq.h"
+
+
+int send__disconnect(struct mosquitto *mosq, uint8_t reason_code, const mosquitto_property *properties)
+{
+	struct mosquitto__packet *packet = NULL;
+	int rc;
+	int proplen, varbytes;
+
+	assert(mosq);
+#ifdef WITH_BROKER
+#  ifdef WITH_BRIDGE
+	if(mosq->bridge){
+		log__printf(mosq, MOSQ_LOG_DEBUG, "Bridge %s sending DISCONNECT", mosq->id);
+	}else
+#  else
+	{
+		log__printf(mosq, MOSQ_LOG_DEBUG, "Sending DISCONNECT to %s (rc%d)", mosq->id, reason_code);
+	}
+#  endif
+#else
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s sending DISCONNECT", mosq->id);
+#endif
+	assert(mosq);
+	packet = mosquitto__calloc(1, sizeof(struct mosquitto__packet));
+	if(!packet) return MOSQ_ERR_NOMEM;
+
+	packet->command = CMD_DISCONNECT;
+	if(mosq->protocol == mosq_p_mqtt5 && (reason_code != 0 || properties)){
+		packet->remaining_length = 1;
+		if(properties){
+			proplen = property__get_length_all(properties);
+			varbytes = packet__varint_bytes(proplen);
+			packet->remaining_length += proplen + varbytes;
+		}
+	}else{
+		packet->remaining_length = 0;
+	}
+
+	rc = packet__alloc(packet);
+	if(rc){
+		mosquitto__free(packet);
+		return rc;
+	}
+	if(mosq->protocol == mosq_p_mqtt5 && (reason_code != 0 || properties)){
+		packet__write_byte(packet, reason_code);
+		if(properties){
+			property__write_all(packet, properties, true);
+		}
+	}
+
+	return packet__queue(mosq, packet);
+}
+
diff --git a/libs/libmosquitto/src/send_mosq.c b/libs/libmosquitto/src/send_mosq.c
new file mode 100644
index 0000000000..27bc1fda17
--- /dev/null
+++ b/libs/libmosquitto/src/send_mosq.c
@@ -0,0 +1,188 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#  include "sys_tree.h"
+#else
+#  define G_PUB_BYTES_SENT_INC(A)
+#endif
+
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+#include "logging_mosq.h"
+#include "mqtt_protocol.h"
+#include "memory_mosq.h"
+#include "net_mosq.h"
+#include "packet_mosq.h"
+#include "property_mosq.h"
+#include "send_mosq.h"
+#include "time_mosq.h"
+#include "util_mosq.h"
+
+int send__pingreq(struct mosquitto *mosq)
+{
+	int rc;
+	assert(mosq);
+#ifdef WITH_BROKER
+	log__printf(NULL, MOSQ_LOG_DEBUG, "Sending PINGREQ to %s", mosq->id);
+#else
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s sending PINGREQ", mosq->id);
+#endif
+	rc = send__simple_command(mosq, CMD_PINGREQ);
+	if(rc == MOSQ_ERR_SUCCESS){
+		mosq->ping_t = mosquitto_time();
+	}
+	return rc;
+}
+
+int send__pingresp(struct mosquitto *mosq)
+{
+#ifdef WITH_BROKER
+	log__printf(NULL, MOSQ_LOG_DEBUG, "Sending PINGRESP to %s", mosq->id);
+#else
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s sending PINGRESP", mosq->id);
+#endif
+	return send__simple_command(mosq, CMD_PINGRESP);
+}
+
+int send__puback(struct mosquitto *mosq, uint16_t mid, uint8_t reason_code)
+{
+#ifdef WITH_BROKER
+	log__printf(NULL, MOSQ_LOG_DEBUG, "Sending PUBACK to %s (m%d, rc%d)", mosq->id, mid, reason_code);
+#else
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s sending PUBACK (m%d, rc%d)", mosq->id, mid, reason_code);
+#endif
+	util__increment_receive_quota(mosq);
+	/* We don't use Reason String or User Property yet. */
+	return send__command_with_mid(mosq, CMD_PUBACK, mid, false, reason_code, NULL);
+}
+
+int send__pubcomp(struct mosquitto *mosq, uint16_t mid)
+{
+#ifdef WITH_BROKER
+	log__printf(NULL, MOSQ_LOG_DEBUG, "Sending PUBCOMP to %s (m%d)", mosq->id, mid);
+#else
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s sending PUBCOMP (m%d)", mosq->id, mid);
+#endif
+	util__increment_receive_quota(mosq);
+	/* We don't use Reason String or User Property yet. */
+	return send__command_with_mid(mosq, CMD_PUBCOMP, mid, false, 0, NULL);
+}
+
+
+int send__pubrec(struct mosquitto *mosq, uint16_t mid, uint8_t reason_code)
+{
+#ifdef WITH_BROKER
+	log__printf(NULL, MOSQ_LOG_DEBUG, "Sending PUBREC to %s (m%d, rc%d)", mosq->id, mid, reason_code);
+#else
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s sending PUBREC (m%d, rc%d)", mosq->id, mid, reason_code);
+#endif
+	if(reason_code >= 0x80 && mosq->protocol == mosq_p_mqtt5){
+		util__increment_receive_quota(mosq);
+	}
+	/* We don't use Reason String or User Property yet. */
+	return send__command_with_mid(mosq, CMD_PUBREC, mid, false, reason_code, NULL);
+}
+
+int send__pubrel(struct mosquitto *mosq, uint16_t mid)
+{
+#ifdef WITH_BROKER
+	log__printf(NULL, MOSQ_LOG_DEBUG, "Sending PUBREL to %s (m%d)", mosq->id, mid);
+#else
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s sending PUBREL (m%d)", mosq->id, mid);
+#endif
+	/* We don't use Reason String or User Property yet. */
+	return send__command_with_mid(mosq, CMD_PUBREL|2, mid, false, 0, NULL);
+}
+
+/* For PUBACK, PUBCOMP, PUBREC, and PUBREL */
+int send__command_with_mid(struct mosquitto *mosq, uint8_t command, uint16_t mid, bool dup, uint8_t reason_code, const mosquitto_property *properties)
+{
+	struct mosquitto__packet *packet = NULL;
+	int rc;
+	int proplen, varbytes;
+
+	assert(mosq);
+	packet = mosquitto__calloc(1, sizeof(struct mosquitto__packet));
+	if(!packet) return MOSQ_ERR_NOMEM;
+
+	packet->command = command;
+	if(dup){
+		packet->command |= 8;
+	}
+	packet->remaining_length = 2;
+
+	if(mosq->protocol == mosq_p_mqtt5){
+		if(reason_code != 0 || properties){
+			packet->remaining_length += 1;
+		}
+
+		if(properties){
+			proplen = property__get_length_all(properties);
+			varbytes = packet__varint_bytes(proplen);
+			packet->remaining_length += varbytes + proplen;
+		}
+	}
+
+	rc = packet__alloc(packet);
+	if(rc){
+		mosquitto__free(packet);
+		return rc;
+	}
+
+	packet__write_uint16(packet, mid);
+
+	if(mosq->protocol == mosq_p_mqtt5){
+		if(reason_code != 0 || properties){
+			packet__write_byte(packet, reason_code);
+		}
+		if(properties){
+			property__write_all(packet, properties, true);
+		}
+	}
+
+	return packet__queue(mosq, packet);
+}
+
+/* For DISCONNECT, PINGREQ and PINGRESP */
+int send__simple_command(struct mosquitto *mosq, uint8_t command)
+{
+	struct mosquitto__packet *packet = NULL;
+	int rc;
+
+	assert(mosq);
+	packet = mosquitto__calloc(1, sizeof(struct mosquitto__packet));
+	if(!packet) return MOSQ_ERR_NOMEM;
+
+	packet->command = command;
+	packet->remaining_length = 0;
+
+	rc = packet__alloc(packet);
+	if(rc){
+		mosquitto__free(packet);
+		return rc;
+	}
+
+	return packet__queue(mosq, packet);
+}
+
diff --git a/libs/libmosquitto/src/send_mosq.h b/libs/libmosquitto/src/send_mosq.h
new file mode 100644
index 0000000000..4b76f2f952
--- /dev/null
+++ b/libs/libmosquitto/src/send_mosq.h
@@ -0,0 +1,38 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+#ifndef SEND_MOSQ_H
+#define SEND_MOSQ_H
+
+#include "mosquitto.h"
+#include "property_mosq.h"
+
+int send__simple_command(struct mosquitto *mosq, uint8_t command);
+int send__command_with_mid(struct mosquitto *mosq, uint8_t command, uint16_t mid, bool dup, uint8_t reason_code, const mosquitto_property *properties);
+int send__real_publish(struct mosquitto *mosq, uint16_t mid, const char *topic, uint32_t payloadlen, const void *payload, int qos, bool retain, bool dup, const mosquitto_property *cmsg_props, const mosquitto_property *store_props, uint32_t expiry_interval);
+
+int send__connect(struct mosquitto *mosq, uint16_t keepalive, bool clean_session, const mosquitto_property *properties);
+int send__disconnect(struct mosquitto *mosq, uint8_t reason_code, const mosquitto_property *properties);
+int send__pingreq(struct mosquitto *mosq);
+int send__pingresp(struct mosquitto *mosq);
+int send__puback(struct mosquitto *mosq, uint16_t mid, uint8_t reason_code);
+int send__pubcomp(struct mosquitto *mosq, uint16_t mid);
+int send__publish(struct mosquitto *mosq, uint16_t mid, const char *topic, uint32_t payloadlen, const void *payload, int qos, bool retain, bool dup, const mosquitto_property *cmsg_props, const mosquitto_property *store_props, uint32_t expiry_interval);
+int send__pubrec(struct mosquitto *mosq, uint16_t mid, uint8_t reason_code);
+int send__pubrel(struct mosquitto *mosq, uint16_t mid);
+int send__subscribe(struct mosquitto *mosq, int *mid, int topic_count, char *const *const topic, int topic_qos, const mosquitto_property *properties);
+int send__unsubscribe(struct mosquitto *mosq, int *mid, int topic_count, char *const *const topic, const mosquitto_property *properties);
+
+#endif
diff --git a/libs/libmosquitto/src/send_publish.c b/libs/libmosquitto/src/send_publish.c
new file mode 100644
index 0000000000..f07c539d40
--- /dev/null
+++ b/libs/libmosquitto/src/send_publish.c
@@ -0,0 +1,215 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <string.h>
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#  include "sys_tree.h"
+#else
+#  define G_PUB_BYTES_SENT_INC(A)
+#endif
+
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+#include "logging_mosq.h"
+#include "mqtt_protocol.h"
+#include "memory_mosq.h"
+#include "net_mosq.h"
+#include "packet_mosq.h"
+#include "property_mosq.h"
+#include "send_mosq.h"
+
+
+int send__publish(struct mosquitto *mosq, uint16_t mid, const char *topic, uint32_t payloadlen, const void *payload, int qos, bool retain, bool dup, const mosquitto_property *cmsg_props, const mosquitto_property *store_props, uint32_t expiry_interval)
+{
+#ifdef WITH_BROKER
+	size_t len;
+#ifdef WITH_BRIDGE
+	int i;
+	struct mosquitto__bridge_topic *cur_topic;
+	bool match;
+	int rc;
+	char *mapped_topic = NULL;
+	char *topic_temp = NULL;
+#endif
+#endif
+	assert(mosq);
+
+#if defined(WITH_BROKER) && defined(WITH_WEBSOCKETS)
+	if(mosq->sock == INVALID_SOCKET && !mosq->wsi) return MOSQ_ERR_NO_CONN;
+#else
+	if(mosq->sock == INVALID_SOCKET) return MOSQ_ERR_NO_CONN;
+#endif
+
+#ifdef WITH_BROKER
+	if(mosq->listener && mosq->listener->mount_point){
+		len = strlen(mosq->listener->mount_point);
+		if(len < strlen(topic)){
+			topic += len;
+		}else{
+			/* Invalid topic string. Should never happen, but silently swallow the message anyway. */
+			return MOSQ_ERR_SUCCESS;
+		}
+	}
+#ifdef WITH_BRIDGE
+	if(mosq->bridge && mosq->bridge->topics && mosq->bridge->topic_remapping){
+		for(i=0; i<mosq->bridge->topic_count; i++){
+			cur_topic = &mosq->bridge->topics[i];
+			if((cur_topic->direction == bd_both || cur_topic->direction == bd_out)
+					&& (cur_topic->remote_prefix || cur_topic->local_prefix)){
+				/* Topic mapping required on this topic if the message matches */
+
+				rc = mosquitto_topic_matches_sub(cur_topic->local_topic, topic, &match);
+				if(rc){
+					return rc;
+				}
+				if(match){
+					mapped_topic = mosquitto__strdup(topic);
+					if(!mapped_topic) return MOSQ_ERR_NOMEM;
+					if(cur_topic->local_prefix){
+						/* This prefix needs removing. */
+						if(!strncmp(cur_topic->local_prefix, mapped_topic, strlen(cur_topic->local_prefix))){
+							topic_temp = mosquitto__strdup(mapped_topic+strlen(cur_topic->local_prefix));
+							mosquitto__free(mapped_topic);
+							if(!topic_temp){
+								return MOSQ_ERR_NOMEM;
+							}
+							mapped_topic = topic_temp;
+						}
+					}
+
+					if(cur_topic->remote_prefix){
+						/* This prefix needs adding. */
+						len = strlen(mapped_topic) + strlen(cur_topic->remote_prefix)+1;
+						topic_temp = mosquitto__malloc(len+1);
+						if(!topic_temp){
+							mosquitto__free(mapped_topic);
+							return MOSQ_ERR_NOMEM;
+						}
+						snprintf(topic_temp, len, "%s%s", cur_topic->remote_prefix, mapped_topic);
+						topic_temp[len] = '\0';
+						mosquitto__free(mapped_topic);
+						mapped_topic = topic_temp;
+					}
+					log__printf(NULL, MOSQ_LOG_DEBUG, "Sending PUBLISH to %s (d%d, q%d, r%d, m%d, '%s', ... (%ld bytes))", mosq->id, dup, qos, retain, mid, mapped_topic, (long)payloadlen);
+					G_PUB_BYTES_SENT_INC(payloadlen);
+					rc =  send__real_publish(mosq, mid, mapped_topic, payloadlen, payload, qos, retain, dup, cmsg_props, store_props, expiry_interval);
+					mosquitto__free(mapped_topic);
+					return rc;
+				}
+			}
+		}
+	}
+#endif
+	log__printf(NULL, MOSQ_LOG_DEBUG, "Sending PUBLISH to %s (d%d, q%d, r%d, m%d, '%s', ... (%ld bytes))", mosq->id, dup, qos, retain, mid, topic, (long)payloadlen);
+	G_PUB_BYTES_SENT_INC(payloadlen);
+#else
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s sending PUBLISH (d%d, q%d, r%d, m%d, '%s', ... (%ld bytes))", mosq->id, dup, qos, retain, mid, topic, (long)payloadlen);
+#endif
+
+	return send__real_publish(mosq, mid, topic, payloadlen, payload, qos, retain, dup, cmsg_props, store_props, expiry_interval);
+}
+
+
+int send__real_publish(struct mosquitto *mosq, uint16_t mid, const char *topic, uint32_t payloadlen, const void *payload, int qos, bool retain, bool dup, const mosquitto_property *cmsg_props, const mosquitto_property *store_props, uint32_t expiry_interval)
+{
+	struct mosquitto__packet *packet = NULL;
+	int packetlen;
+	int proplen = 0, varbytes;
+	int rc;
+	mosquitto_property expiry_prop;
+
+	assert(mosq);
+
+	if(topic){
+		packetlen = 2+strlen(topic) + payloadlen;
+	}else{
+		packetlen = 2 + payloadlen;
+	}
+	if(qos > 0) packetlen += 2; /* For message id */
+	if(mosq->protocol == mosq_p_mqtt5){
+		proplen = 0;
+		proplen += property__get_length_all(cmsg_props);
+		proplen += property__get_length_all(store_props);
+		if(expiry_interval > 0){
+			expiry_prop.next = NULL;
+			expiry_prop.value.i32 = expiry_interval;
+			expiry_prop.identifier = MQTT_PROP_MESSAGE_EXPIRY_INTERVAL;
+			expiry_prop.client_generated = false;
+
+			proplen += property__get_length_all(&expiry_prop);
+		}
+
+		varbytes = packet__varint_bytes(proplen);
+		if(varbytes > 4){
+			/* FIXME - Properties too big, don't publish any - should remove some first really */
+			cmsg_props = NULL;
+			store_props = NULL;
+			expiry_interval = 0;
+		}else{
+			packetlen += proplen + varbytes;
+		}
+	}
+	if(packet__check_oversize(mosq, packetlen)){
+#ifdef WITH_BROKER
+		log__printf(NULL, MOSQ_LOG_NOTICE, "Dropping too large outgoing PUBLISH for %s (%d bytes)", mosq->id, packetlen);
+#else
+		log__printf(NULL, MOSQ_LOG_NOTICE, "Dropping too large outgoing PUBLISH (%d bytes)", packetlen);
+#endif
+		return MOSQ_ERR_OVERSIZE_PACKET;
+	}
+
+	packet = mosquitto__calloc(1, sizeof(struct mosquitto__packet));
+	if(!packet) return MOSQ_ERR_NOMEM;
+
+	packet->mid = mid;
+	packet->command = CMD_PUBLISH | ((dup&0x1)<<3) | (qos<<1) | retain;
+	packet->remaining_length = packetlen;
+	rc = packet__alloc(packet);
+	if(rc){
+		mosquitto__free(packet);
+		return rc;
+	}
+	/* Variable header (topic string) */
+	if(topic){
+		packet__write_string(packet, topic, strlen(topic));
+	}else{
+		packet__write_uint16(packet, 0);
+	}
+	if(qos > 0){
+		packet__write_uint16(packet, mid);
+	}
+
+	if(mosq->protocol == mosq_p_mqtt5){
+		packet__write_varint(packet, proplen);
+		property__write_all(packet, cmsg_props, false);
+		property__write_all(packet, store_props, false);
+		if(expiry_interval > 0){
+			property__write_all(packet, &expiry_prop, false);
+		}
+	}
+
+	/* Payload */
+	if(payloadlen){
+		packet__write_bytes(packet, payload, payloadlen);
+	}
+
+	return packet__queue(mosq, packet);
+}
diff --git a/libs/libmosquitto/src/send_subscribe.c b/libs/libmosquitto/src/send_subscribe.c
new file mode 100644
index 0000000000..1f2760f985
--- /dev/null
+++ b/libs/libmosquitto/src/send_subscribe.c
@@ -0,0 +1,96 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <string.h>
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#endif
+
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+#include "logging_mosq.h"
+#include "memory_mosq.h"
+#include "mqtt_protocol.h"
+#include "packet_mosq.h"
+#include "property_mosq.h"
+#include "util_mosq.h"
+
+
+int send__subscribe(struct mosquitto *mosq, int *mid, int topic_count, const char **topic, int topic_qos, const mosquitto_property *properties)
+{
+	struct mosquitto__packet *packet = NULL;
+	uint32_t packetlen;
+	uint16_t local_mid;
+	int rc;
+	int i;
+	int proplen, varbytes;
+
+	assert(mosq);
+	assert(topic);
+
+	packet = mosquitto__calloc(1, sizeof(struct mosquitto__packet));
+	if(!packet) return MOSQ_ERR_NOMEM;
+
+	packetlen = 2;
+	if(mosq->protocol == mosq_p_mqtt5){
+		proplen = property__get_length_all(properties);
+		varbytes = packet__varint_bytes(proplen);
+		packetlen += proplen + varbytes;
+	}
+	for(i=0; i<topic_count; i++){
+		packetlen += 2+strlen(topic[i]) + 1;
+	}
+
+	packet->command = CMD_SUBSCRIBE | (1<<1);
+	packet->remaining_length = packetlen;
+	rc = packet__alloc(packet);
+	if(rc){
+		mosquitto__free(packet);
+		return rc;
+	}
+
+	/* Variable header */
+	local_mid = mosquitto__mid_generate(mosq);
+	if(mid) *mid = (int)local_mid;
+	packet__write_uint16(packet, local_mid);
+
+	if(mosq->protocol == mosq_p_mqtt5){
+		property__write_all(packet, properties, true);
+	}
+
+	/* Payload */
+	for(i=0; i<topic_count; i++){
+		packet__write_string(packet, topic[i], strlen(topic[i]));
+		packet__write_byte(packet, topic_qos);
+	}
+
+#ifdef WITH_BROKER
+# ifdef WITH_BRIDGE
+	log__printf(mosq, MOSQ_LOG_DEBUG, "Bridge %s sending SUBSCRIBE (Mid: %d, Topic: %s, QoS: %d, Options: 0x%02x)", mosq->id, local_mid, topic[0], topic_qos&0x03, topic_qos&0xFC);
+# endif
+#else
+	for(i=0; i<topic_count; i++){
+		log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s sending SUBSCRIBE (Mid: %d, Topic: %s, QoS: %d, Options: 0x%02x)", mosq->id, local_mid, topic[i], topic_qos&0x03, topic_qos&0xFC);
+	}
+#endif
+
+	return packet__queue(mosq, packet);
+}
+
diff --git a/libs/libmosquitto/src/send_unsubscribe.c b/libs/libmosquitto/src/send_unsubscribe.c
new file mode 100644
index 0000000000..e7317151a5
--- /dev/null
+++ b/libs/libmosquitto/src/send_unsubscribe.c
@@ -0,0 +1,99 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <string.h>
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#endif
+
+#include "mosquitto.h"
+#include "logging_mosq.h"
+#include "memory_mosq.h"
+#include "mqtt_protocol.h"
+#include "packet_mosq.h"
+#include "property_mosq.h"
+#include "send_mosq.h"
+#include "util_mosq.h"
+
+
+int send__unsubscribe(struct mosquitto *mosq, int *mid, int topic_count, char *const *const topic, const mosquitto_property *properties)
+{
+	/* FIXME - only deals with a single topic */
+	struct mosquitto__packet *packet = NULL;
+	uint32_t packetlen;
+	uint16_t local_mid;
+	int rc;
+	int proplen, varbytes;
+	int i;
+
+	assert(mosq);
+	assert(topic);
+
+	packet = mosquitto__calloc(1, sizeof(struct mosquitto__packet));
+	if(!packet) return MOSQ_ERR_NOMEM;
+
+	packetlen = 2;
+
+	for(i=0; i<topic_count; i++){
+		packetlen += 2+strlen(topic[i]);
+	}
+	if(mosq->protocol == mosq_p_mqtt5){
+		proplen = property__get_length_all(properties);
+		varbytes = packet__varint_bytes(proplen);
+		packetlen += proplen + varbytes;
+	}
+
+	packet->command = CMD_UNSUBSCRIBE | (1<<1);
+	packet->remaining_length = packetlen;
+	rc = packet__alloc(packet);
+	if(rc){
+		mosquitto__free(packet);
+		return rc;
+	}
+
+	/* Variable header */
+	local_mid = mosquitto__mid_generate(mosq);
+	if(mid) *mid = (int)local_mid;
+	packet__write_uint16(packet, local_mid);
+
+	if(mosq->protocol == mosq_p_mqtt5){
+		/* We don't use User Property yet. */
+		property__write_all(packet, properties, true);
+	}
+
+	/* Payload */
+	for(i=0; i<topic_count; i++){
+		packet__write_string(packet, topic[i], strlen(topic[i]));
+	}
+
+#ifdef WITH_BROKER
+# ifdef WITH_BRIDGE
+	for(i=0; i<topic_count; i++){
+		log__printf(mosq, MOSQ_LOG_DEBUG, "Bridge %s sending UNSUBSCRIBE (Mid: %d, Topic: %s)", mosq->id, local_mid, topic[i]);
+	}
+# endif
+#else
+	for(i=0; i<topic_count; i++){
+		log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s sending UNSUBSCRIBE (Mid: %d, Topic: %s)", mosq->id, local_mid, topic[i]);
+	}
+#endif
+	return packet__queue(mosq, packet);
+}
+
diff --git a/libs/libmosquitto/src/socks_mosq.c b/libs/libmosquitto/src/socks_mosq.c
new file mode 100644
index 0000000000..0df58a4b65
--- /dev/null
+++ b/libs/libmosquitto/src/socks_mosq.c
@@ -0,0 +1,460 @@
+/*
+Copyright (c) 2014-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <errno.h>
+#include <string.h>
+#include <limits.h>
+#ifdef WIN32
+#  include <ws2tcpip.h>
+#elif __QNX__
+#  include <sys/socket.h>
+#  include <netinet/in.h>
+#else
+#  include <arpa/inet.h>
+#endif
+#ifdef __FreeBSD__
+#  include <sys/socket.h>
+#  include <netinet/in.h>
+#endif
+
+#include "mosquitto_internal.h"
+#include "memory_mosq.h"
+#include "net_mosq.h"
+#include "packet_mosq.h"
+#include "send_mosq.h"
+
+#define SOCKS_AUTH_NONE 0x00
+#define SOCKS_AUTH_GSS 0x01
+#define SOCKS_AUTH_USERPASS 0x02
+#define SOCKS_AUTH_NO_ACCEPTABLE 0xFF
+
+#define SOCKS_ATYPE_IP_V4 1 /* four bytes */
+#define SOCKS_ATYPE_DOMAINNAME 3 /* one byte length, followed by fqdn no null, 256 max chars */
+#define SOCKS_ATYPE_IP_V6 4 /* 16 bytes */
+
+#define SOCKS_REPLY_SUCCEEDED 0x00
+#define SOCKS_REPLY_GENERAL_FAILURE 0x01
+#define SOCKS_REPLY_CONNECTION_NOT_ALLOWED 0x02
+#define SOCKS_REPLY_NETWORK_UNREACHABLE 0x03
+#define SOCKS_REPLY_HOST_UNREACHABLE 0x04
+#define SOCKS_REPLY_CONNECTION_REFUSED 0x05
+#define SOCKS_REPLY_TTL_EXPIRED 0x06
+#define SOCKS_REPLY_COMMAND_NOT_SUPPORTED 0x07
+#define SOCKS_REPLY_ADDRESS_TYPE_NOT_SUPPORTED 0x08
+
+int mosquitto_socks5_set(struct mosquitto *mosq, const char *host, int port, const char *username, const char *password)
+{
+#ifdef WITH_SOCKS
+	if(!mosq) return MOSQ_ERR_INVAL;
+	if(!host || strlen(host) > 256) return MOSQ_ERR_INVAL;
+	if(port < 1 || port > 65535) return MOSQ_ERR_INVAL;
+
+	mosquitto__free(mosq->socks5_host);
+	mosq->socks5_host = NULL;
+
+	mosq->socks5_host = mosquitto__strdup(host);
+	if(!mosq->socks5_host){
+		return MOSQ_ERR_NOMEM;
+	}
+
+	mosq->socks5_port = port;
+
+	mosquitto__free(mosq->socks5_username);
+	mosq->socks5_username = NULL;
+
+	mosquitto__free(mosq->socks5_password);
+	mosq->socks5_password = NULL;
+
+	if(username){
+		mosq->socks5_username = mosquitto__strdup(username);
+		if(!mosq->socks5_username){
+			return MOSQ_ERR_NOMEM;
+		}
+
+		if(password){
+			mosq->socks5_password = mosquitto__strdup(password);
+			if(!mosq->socks5_password){
+				mosquitto__free(mosq->socks5_username);
+				return MOSQ_ERR_NOMEM;
+			}
+		}
+	}
+
+	return MOSQ_ERR_SUCCESS;
+#else
+	return MOSQ_ERR_NOT_SUPPORTED;
+#endif
+}
+
+#ifdef WITH_SOCKS
+int socks5__send(struct mosquitto *mosq)
+{
+	struct mosquitto__packet *packet;
+	int slen;
+	int ulen, plen;
+
+	struct in_addr addr_ipv4;
+	struct in6_addr addr_ipv6;
+	int ipv4_pton_result;
+	int ipv6_pton_result;
+
+	if(mosq->state == mosq_cs_socks5_new){
+		packet = mosquitto__calloc(1, sizeof(struct mosquitto__packet));
+		if(!packet) return MOSQ_ERR_NOMEM;
+
+		if(mosq->socks5_username){
+			packet->packet_length = 4;
+		}else{
+			packet->packet_length = 3;
+		}
+		packet->payload = mosquitto__malloc(sizeof(uint8_t)*packet->packet_length);
+
+		packet->payload[0] = 0x05;
+		if(mosq->socks5_username){
+			packet->payload[1] = 2;
+			packet->payload[2] = SOCKS_AUTH_NONE;
+			packet->payload[3] = SOCKS_AUTH_USERPASS;
+		}else{
+			packet->payload[1] = 1;
+			packet->payload[2] = SOCKS_AUTH_NONE;
+		}
+
+		pthread_mutex_lock(&mosq->state_mutex);
+		mosq->state = mosq_cs_socks5_start;
+		pthread_mutex_unlock(&mosq->state_mutex);
+
+		mosq->in_packet.pos = 0;
+		mosq->in_packet.packet_length = 2;
+		mosq->in_packet.to_process = 2;
+		mosq->in_packet.payload = mosquitto__malloc(sizeof(uint8_t)*2);
+		if(!mosq->in_packet.payload){
+			mosquitto__free(packet->payload);
+			mosquitto__free(packet);
+			return MOSQ_ERR_NOMEM;
+		}
+
+		return packet__queue(mosq, packet);
+	}else if(mosq->state == mosq_cs_socks5_auth_ok){
+		packet = mosquitto__calloc(1, sizeof(struct mosquitto__packet));
+		if(!packet) return MOSQ_ERR_NOMEM;
+
+		ipv4_pton_result = inet_pton(AF_INET, mosq->host, &addr_ipv4);
+		ipv6_pton_result = inet_pton(AF_INET6, mosq->host, &addr_ipv6);
+
+		if(ipv4_pton_result == 1){
+			packet->packet_length = 10;
+			packet->payload = mosquitto__malloc(sizeof(uint8_t)*packet->packet_length);
+			if(!packet->payload){
+				mosquitto__free(packet);
+				return MOSQ_ERR_NOMEM;
+			}
+			packet->payload[3] = SOCKS_ATYPE_IP_V4;
+			memcpy(&(packet->payload[4]), (const void*)&addr_ipv4, 4);
+			packet->payload[4+4] = MOSQ_MSB(mosq->port);
+			packet->payload[4+4+1] = MOSQ_LSB(mosq->port);
+
+		}else if(ipv6_pton_result == 1){
+			packet->packet_length = 22;
+			packet->payload = mosquitto__malloc(sizeof(uint8_t)*packet->packet_length);
+			if(!packet->payload){
+				mosquitto__free(packet);
+				return MOSQ_ERR_NOMEM;
+			}
+			packet->payload[3] = SOCKS_ATYPE_IP_V6;
+			memcpy(&(packet->payload[4]), (const void*)&addr_ipv6, 16);
+			packet->payload[4+16] = MOSQ_MSB(mosq->port);
+			packet->payload[4+16+1] = MOSQ_LSB(mosq->port);
+
+		}else{
+			slen = strlen(mosq->host);
+			if(slen > UCHAR_MAX){
+				return MOSQ_ERR_NOMEM;
+			}
+			packet->packet_length = 7 + slen;
+			packet->payload = mosquitto__malloc(sizeof(uint8_t)*packet->packet_length);
+			if(!packet->payload){
+				mosquitto__free(packet);
+				return MOSQ_ERR_NOMEM;
+			}
+			packet->payload[3] = SOCKS_ATYPE_DOMAINNAME;
+			packet->payload[4] = (uint8_t)slen;
+			memcpy(&(packet->payload[5]), mosq->host, slen);
+			packet->payload[5+slen] = MOSQ_MSB(mosq->port);
+			packet->payload[6+slen] = MOSQ_LSB(mosq->port);
+		}
+		packet->payload[0] = 0x05;
+		packet->payload[1] = 0x01;
+		packet->payload[2] = 0x00;
+
+		pthread_mutex_lock(&mosq->state_mutex);
+		mosq->state = mosq_cs_socks5_request;
+		pthread_mutex_unlock(&mosq->state_mutex);
+
+		mosq->in_packet.pos = 0;
+		mosq->in_packet.packet_length = 5;
+		mosq->in_packet.to_process = 5;
+		mosq->in_packet.payload = mosquitto__malloc(sizeof(uint8_t)*5);
+		if(!mosq->in_packet.payload){
+			mosquitto__free(packet->payload);
+			mosquitto__free(packet);
+			return MOSQ_ERR_NOMEM;
+		}
+
+		return packet__queue(mosq, packet);
+	}else if(mosq->state == mosq_cs_socks5_send_userpass){
+		packet = mosquitto__calloc(1, sizeof(struct mosquitto__packet));
+		if(!packet) return MOSQ_ERR_NOMEM;
+
+		ulen = strlen(mosq->socks5_username);
+		plen = strlen(mosq->socks5_password);
+		packet->packet_length = 3 + ulen + plen;
+		packet->payload = mosquitto__malloc(sizeof(uint8_t)*packet->packet_length);
+
+
+		packet->payload[0] = 0x01;
+		packet->payload[1] = ulen;
+		memcpy(&(packet->payload[2]), mosq->socks5_username, ulen);
+		packet->payload[2+ulen] = plen;
+		memcpy(&(packet->payload[3+ulen]), mosq->socks5_password, plen);
+
+		pthread_mutex_lock(&mosq->state_mutex);
+		mosq->state = mosq_cs_socks5_userpass_reply;
+		pthread_mutex_unlock(&mosq->state_mutex);
+
+		mosq->in_packet.pos = 0;
+		mosq->in_packet.packet_length = 2;
+		mosq->in_packet.to_process = 2;
+		mosq->in_packet.payload = mosquitto__malloc(sizeof(uint8_t)*2);
+		if(!mosq->in_packet.payload){
+			mosquitto__free(packet->payload);
+			mosquitto__free(packet);
+			return MOSQ_ERR_NOMEM;
+		}
+
+		return packet__queue(mosq, packet);
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+
+int socks5__read(struct mosquitto *mosq)
+{
+	ssize_t len;
+	uint8_t *payload;
+	uint8_t i;
+
+	if(mosq->state == mosq_cs_socks5_start){
+		while(mosq->in_packet.to_process > 0){
+			len = net__read(mosq, &(mosq->in_packet.payload[mosq->in_packet.pos]), mosq->in_packet.to_process);
+			if(len > 0){
+				mosq->in_packet.pos += len;
+				mosq->in_packet.to_process -= len;
+			}else{
+#ifdef WIN32
+				errno = WSAGetLastError();
+#endif
+				if(errno == EAGAIN || errno == COMPAT_EWOULDBLOCK){
+					return MOSQ_ERR_SUCCESS;
+				}else{
+					packet__cleanup(&mosq->in_packet);
+					switch(errno){
+						case 0:
+							return MOSQ_ERR_PROXY;
+						case COMPAT_ECONNRESET:
+							return MOSQ_ERR_CONN_LOST;
+						default:
+							return MOSQ_ERR_ERRNO;
+					}
+				}
+			}
+		}
+		if(mosq->in_packet.payload[0] != 5){
+			packet__cleanup(&mosq->in_packet);
+			return MOSQ_ERR_PROXY;
+		}
+		switch(mosq->in_packet.payload[1]){
+			case SOCKS_AUTH_NONE:
+				packet__cleanup(&mosq->in_packet);
+				mosq->state = mosq_cs_socks5_auth_ok;
+				return socks5__send(mosq);
+			case SOCKS_AUTH_USERPASS:
+				packet__cleanup(&mosq->in_packet);
+				mosq->state = mosq_cs_socks5_send_userpass;
+				return socks5__send(mosq);
+			default:
+				packet__cleanup(&mosq->in_packet);
+				return MOSQ_ERR_AUTH;
+		}
+	}else if(mosq->state == mosq_cs_socks5_userpass_reply){
+		while(mosq->in_packet.to_process > 0){
+			len = net__read(mosq, &(mosq->in_packet.payload[mosq->in_packet.pos]), mosq->in_packet.to_process);
+			if(len > 0){
+				mosq->in_packet.pos += len;
+				mosq->in_packet.to_process -= len;
+			}else{
+#ifdef WIN32
+				errno = WSAGetLastError();
+#endif
+				if(errno == EAGAIN || errno == COMPAT_EWOULDBLOCK){
+					return MOSQ_ERR_SUCCESS;
+				}else{
+					packet__cleanup(&mosq->in_packet);
+					switch(errno){
+						case 0:
+							return MOSQ_ERR_PROXY;
+						case COMPAT_ECONNRESET:
+							return MOSQ_ERR_CONN_LOST;
+						default:
+							return MOSQ_ERR_ERRNO;
+					}
+				}
+			}
+		}
+		if(mosq->in_packet.payload[0] != 1){
+			packet__cleanup(&mosq->in_packet);
+			return MOSQ_ERR_PROXY;
+		}
+		if(mosq->in_packet.payload[1] == 0){
+			packet__cleanup(&mosq->in_packet);
+			mosq->state = mosq_cs_socks5_auth_ok;
+			return socks5__send(mosq);
+		}else{
+			i = mosq->in_packet.payload[1];
+			packet__cleanup(&mosq->in_packet);
+			switch(i){
+				case SOCKS_REPLY_CONNECTION_NOT_ALLOWED:
+					return MOSQ_ERR_AUTH;
+
+				case SOCKS_REPLY_NETWORK_UNREACHABLE:
+				case SOCKS_REPLY_HOST_UNREACHABLE:
+				case SOCKS_REPLY_CONNECTION_REFUSED:
+					return MOSQ_ERR_NO_CONN;
+
+				case SOCKS_REPLY_GENERAL_FAILURE:
+				case SOCKS_REPLY_TTL_EXPIRED:
+				case SOCKS_REPLY_COMMAND_NOT_SUPPORTED:
+				case SOCKS_REPLY_ADDRESS_TYPE_NOT_SUPPORTED:
+					return MOSQ_ERR_PROXY;
+
+				default:
+					return MOSQ_ERR_INVAL;
+			}
+			return MOSQ_ERR_PROXY;
+		}
+	}else if(mosq->state == mosq_cs_socks5_request){
+		while(mosq->in_packet.to_process > 0){
+			len = net__read(mosq, &(mosq->in_packet.payload[mosq->in_packet.pos]), mosq->in_packet.to_process);
+			if(len > 0){
+				mosq->in_packet.pos += len;
+				mosq->in_packet.to_process -= len;
+			}else{
+#ifdef WIN32
+				errno = WSAGetLastError();
+#endif
+				if(errno == EAGAIN || errno == COMPAT_EWOULDBLOCK){
+					return MOSQ_ERR_SUCCESS;
+				}else{
+					packet__cleanup(&mosq->in_packet);
+					switch(errno){
+						case 0:
+							return MOSQ_ERR_PROXY;
+						case COMPAT_ECONNRESET:
+							return MOSQ_ERR_CONN_LOST;
+						default:
+							return MOSQ_ERR_ERRNO;
+					}
+				}
+			}
+		}
+
+		if(mosq->in_packet.packet_length == 5){
+			/* First part of the packet has been received, we now know what else to expect. */
+			if(mosq->in_packet.payload[3] == SOCKS_ATYPE_IP_V4){
+				mosq->in_packet.to_process += 4+2-1; /* 4 bytes IPv4, 2 bytes port, -1 byte because we've already read the first byte */
+				mosq->in_packet.packet_length += 4+2-1;
+			}else if(mosq->in_packet.payload[3] == SOCKS_ATYPE_IP_V6){
+				mosq->in_packet.to_process += 16+2-1; /* 16 bytes IPv6, 2 bytes port, -1 byte because we've already read the first byte */
+				mosq->in_packet.packet_length += 16+2-1;
+			}else if(mosq->in_packet.payload[3] == SOCKS_ATYPE_DOMAINNAME){
+				if(mosq->in_packet.payload[4] > 0){
+					mosq->in_packet.to_process += mosq->in_packet.payload[4];
+					mosq->in_packet.packet_length += mosq->in_packet.payload[4];
+				}
+			}else{
+				packet__cleanup(&mosq->in_packet);
+				return MOSQ_ERR_PROTOCOL;
+			}
+			payload = mosquitto__realloc(mosq->in_packet.payload, mosq->in_packet.packet_length);
+			if(payload){
+				mosq->in_packet.payload = payload;
+			}else{
+				packet__cleanup(&mosq->in_packet);
+				return MOSQ_ERR_NOMEM;
+			}
+			payload = mosquitto__realloc(mosq->in_packet.payload, mosq->in_packet.packet_length);
+			if(payload){
+				mosq->in_packet.payload = payload;
+			}else{
+				packet__cleanup(&mosq->in_packet);
+				return MOSQ_ERR_NOMEM;
+			}
+			return MOSQ_ERR_SUCCESS;
+		}
+
+		/* Entire packet is now read. */
+		if(mosq->in_packet.payload[0] != 5){
+			packet__cleanup(&mosq->in_packet);
+			return MOSQ_ERR_PROXY;
+		}
+		if(mosq->in_packet.payload[1] == 0){
+			/* Auth passed */
+			packet__cleanup(&mosq->in_packet);
+			mosq->state = mosq_cs_new;
+			if(mosq->socks5_host){
+				int rc = net__socket_connect_step3(mosq, mosq->host);
+				if(rc) return rc;
+			}
+			return send__connect(mosq, mosq->keepalive, mosq->clean_start, NULL);
+		}else{
+			i = mosq->in_packet.payload[1];
+			packet__cleanup(&mosq->in_packet);
+			mosq->state = mosq_cs_socks5_new;
+			switch(i){
+				case SOCKS_REPLY_CONNECTION_NOT_ALLOWED:
+					return MOSQ_ERR_AUTH;
+
+				case SOCKS_REPLY_NETWORK_UNREACHABLE:
+				case SOCKS_REPLY_HOST_UNREACHABLE:
+				case SOCKS_REPLY_CONNECTION_REFUSED:
+					return MOSQ_ERR_NO_CONN;
+
+				case SOCKS_REPLY_GENERAL_FAILURE:
+				case SOCKS_REPLY_TTL_EXPIRED:
+				case SOCKS_REPLY_COMMAND_NOT_SUPPORTED:
+				case SOCKS_REPLY_ADDRESS_TYPE_NOT_SUPPORTED:
+					return MOSQ_ERR_PROXY;
+
+				default:
+					return MOSQ_ERR_INVAL;
+			}
+		}
+	}else{
+		return packet__read(mosq);
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+#endif
diff --git a/libs/libmosquitto/src/socks_mosq.h b/libs/libmosquitto/src/socks_mosq.h
new file mode 100644
index 0000000000..27b3dc3f31
--- /dev/null
+++ b/libs/libmosquitto/src/socks_mosq.h
@@ -0,0 +1,23 @@
+/*
+Copyright (c) 2014-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#ifndef SOCKS_MOSQ_H
+#define SOCKS_MOSQ_H
+
+int socks5__send(struct mosquitto *mosq);
+int socks5__read(struct mosquitto *mosq);
+
+#endif
diff --git a/libs/libmosquitto/src/srv_mosq.c b/libs/libmosquitto/src/srv_mosq.c
new file mode 100644
index 0000000000..d08c2bd0cc
--- /dev/null
+++ b/libs/libmosquitto/src/srv_mosq.c
@@ -0,0 +1,112 @@
+/*
+Copyright (c) 2013-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#ifdef WITH_SRV
+#  include <ares.h>
+
+#  include <arpa/nameser.h>
+#  include <stdio.h>
+#  include <string.h>
+#endif
+
+#include "logging_mosq.h"
+#include "memory_mosq.h"
+#include "mosquitto_internal.h"
+#include "mosquitto.h"
+
+#ifdef WITH_SRV
+static void srv_callback(void *arg, int status, int timeouts, unsigned char *abuf, int alen)
+{   
+	struct mosquitto *mosq = arg;
+	struct ares_srv_reply *reply = NULL;
+	if(status == ARES_SUCCESS){
+		status = ares_parse_srv_reply(abuf, alen, &reply);
+		if(status == ARES_SUCCESS){
+			// FIXME - choose which answer to use based on rfc2782 page 3. */
+			mosquitto_connect(mosq, reply->host, reply->port, mosq->keepalive);
+		}
+	}else{
+		log__printf(mosq, MOSQ_LOG_ERR, "Error: SRV lookup failed (%d).", status);
+		/* FIXME - calling on_disconnect here isn't correct. */
+		pthread_mutex_lock(&mosq->callback_mutex);
+		if(mosq->on_disconnect){
+			mosq->in_callback = true;
+			mosq->on_disconnect(mosq, mosq->userdata, MOSQ_ERR_LOOKUP);
+			mosq->in_callback = false;
+		}
+		if(mosq->on_disconnect_v5){
+			mosq->in_callback = true;
+			mosq->on_disconnect_v5(mosq, mosq->userdata, MOSQ_ERR_LOOKUP, NULL);
+			mosq->in_callback = false;
+		}
+		pthread_mutex_unlock(&mosq->callback_mutex);
+	}
+}
+#endif
+
+int mosquitto_connect_srv(struct mosquitto *mosq, const char *host, int keepalive, const char *bind_address)
+{
+#ifdef WITH_SRV
+	char *h;
+	int rc;
+	if(!mosq) return MOSQ_ERR_INVAL;
+
+	rc = ares_init(&mosq->achan);
+	if(rc != ARES_SUCCESS){
+		return MOSQ_ERR_UNKNOWN;
+	}
+
+	if(!host){
+		// get local domain
+	}else{
+#ifdef WITH_TLS
+		if(mosq->tls_cafile || mosq->tls_capath || mosq->tls_psk){
+			h = mosquitto__malloc(strlen(host) + strlen("_secure-mqtt._tcp.") + 1);
+			if(!h) return MOSQ_ERR_NOMEM;
+			sprintf(h, "_secure-mqtt._tcp.%s", host);
+		}else{
+#endif
+			h = mosquitto__malloc(strlen(host) + strlen("_mqtt._tcp.") + 1);
+			if(!h) return MOSQ_ERR_NOMEM;
+			sprintf(h, "_mqtt._tcp.%s", host);
+#ifdef WITH_TLS
+		}
+#endif
+		ares_search(mosq->achan, h, ns_c_in, ns_t_srv, srv_callback, mosq);
+		mosquitto__free(h);
+	}
+
+	pthread_mutex_lock(&mosq->state_mutex);
+	mosq->state = mosq_cs_connect_srv;
+	pthread_mutex_unlock(&mosq->state_mutex);
+
+	mosq->keepalive = keepalive;
+
+	return MOSQ_ERR_SUCCESS;
+
+#else
+	UNUSED(mosq);
+	UNUSED(host);
+	UNUSED(keepalive);
+	UNUSED(bind_address);
+
+	return MOSQ_ERR_NOT_SUPPORTED;
+#endif
+}
+
+
diff --git a/libs/libmosquitto/src/stdafx.cxx b/libs/libmosquitto/src/stdafx.cxx
new file mode 100644
index 0000000000..1647228cd0
--- /dev/null
+++ b/libs/libmosquitto/src/stdafx.cxx
@@ -0,0 +1,2 @@
+
+#include "stdafx.h"
\ No newline at end of file
diff --git a/libs/libmosquitto/src/stdafx.h b/libs/libmosquitto/src/stdafx.h
new file mode 100644
index 0000000000..6f70f09bee
--- /dev/null
+++ b/libs/libmosquitto/src/stdafx.h
@@ -0,0 +1 @@
+#pragma once
diff --git a/libs/libmosquitto/src/thread_mosq.c b/libs/libmosquitto/src/thread_mosq.c
new file mode 100644
index 0000000000..7bde453d3d
--- /dev/null
+++ b/libs/libmosquitto/src/thread_mosq.c
@@ -0,0 +1,133 @@
+/*
+Copyright (c) 2011-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#ifndef WIN32
+#include <time.h>
+#endif
+
+#include "mosquitto_internal.h"
+#include "net_mosq.h"
+
+void *mosquitto__thread_main(void *obj);
+
+int mosquitto_loop_start(struct mosquitto *mosq)
+{
+#if defined(WITH_THREADING) && defined(HAVE_PTHREAD_CANCEL)
+	if(!mosq || mosq->threaded != mosq_ts_none) return MOSQ_ERR_INVAL;
+
+	mosq->threaded = mosq_ts_self;
+	if(!pthread_create(&mosq->thread_id, NULL, mosquitto__thread_main, mosq)){
+		return MOSQ_ERR_SUCCESS;
+	}else{
+		return MOSQ_ERR_ERRNO;
+	}
+#else
+	return MOSQ_ERR_NOT_SUPPORTED;
+#endif
+}
+
+int mosquitto_loop_stop(struct mosquitto *mosq, bool force)
+{
+#if defined(WITH_THREADING) && defined(HAVE_PTHREAD_CANCEL)
+#  ifndef WITH_BROKER
+	char sockpair_data = 0;
+#  endif
+
+	if(!mosq || mosq->threaded != mosq_ts_self) return MOSQ_ERR_INVAL;
+
+
+	/* Write a single byte to sockpairW (connected to sockpairR) to break out
+	 * of select() if in threaded mode. */
+	if(mosq->sockpairW != INVALID_SOCKET){
+#ifndef WIN32
+		if(write(mosq->sockpairW, &sockpair_data, 1)){
+		}
+#else
+		send(mosq->sockpairW, &sockpair_data, 1, 0);
+#endif
+	}
+	
+	if(force){
+		pthread_cancel(mosq->thread_id);
+	}
+	pthread_join(mosq->thread_id, NULL);
+	mosq->thread_id = pthread_self();
+	mosq->threaded = mosq_ts_none;
+
+	return MOSQ_ERR_SUCCESS;
+#else
+	return MOSQ_ERR_NOT_SUPPORTED;
+#endif
+}
+
+#ifdef WITH_THREADING
+void *mosquitto__thread_main(void *obj)
+{
+	struct mosquitto *mosq = obj;
+	int state;
+#ifndef WIN32
+	struct timespec ts;
+	ts.tv_sec = 0;
+	ts.tv_nsec = 10000000;
+#endif
+
+	if(!mosq) return NULL;
+
+	do{
+		pthread_mutex_lock(&mosq->state_mutex);
+		state = mosq->state;
+		pthread_mutex_unlock(&mosq->state_mutex);
+		if(state == mosq_cs_new){
+#ifdef WIN32
+			Sleep(10);
+#else
+			nanosleep(&ts, NULL);
+#endif
+		}else{
+			break;
+		}
+	}while(1);
+
+	if(state == mosq_cs_connect_async){
+		mosquitto_reconnect(mosq);
+	}
+
+	if(!mosq->keepalive){
+		/* Sleep for a day if keepalive disabled. */
+		mosquitto_loop_forever(mosq, 1000*86400, 1);
+	}else{
+		/* Sleep for our keepalive value. publish() etc. will wake us up. */
+		mosquitto_loop_forever(mosq, mosq->keepalive*1000, 1);
+	}
+
+	return obj;
+}
+#endif
+
+int mosquitto_threaded_set(struct mosquitto *mosq, bool threaded)
+{
+	if(!mosq) return MOSQ_ERR_INVAL;
+
+	if(threaded){
+		mosq->threaded = mosq_ts_external;
+	}else{
+		mosq->threaded = mosq_ts_none;
+	}
+
+	return MOSQ_ERR_SUCCESS;
+}
diff --git a/libs/libmosquitto/src/time_mosq.c b/libs/libmosquitto/src/time_mosq.c
new file mode 100644
index 0000000000..c66d985444
--- /dev/null
+++ b/libs/libmosquitto/src/time_mosq.c
@@ -0,0 +1,61 @@
+/*
+Copyright (c) 2013-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#ifdef __APPLE__
+#include <mach/mach.h>
+#include <mach/mach_time.h>
+#endif
+
+#ifdef WIN32
+#  define _WIN32_WINNT _WIN32_WINNT_VISTA
+#  include <windows.h>
+#else
+#  include <unistd.h>
+#endif
+#include <time.h>
+
+#include "mosquitto.h"
+#include "time_mosq.h"
+
+time_t mosquitto_time(void)
+{
+#ifdef WIN32
+	return GetTickCount64()/1000;
+#elif _POSIX_TIMERS>0 && defined(_POSIX_MONOTONIC_CLOCK)
+	struct timespec tp;
+
+	clock_gettime(CLOCK_MONOTONIC, &tp);
+	return tp.tv_sec;
+#elif defined(__APPLE__)
+	static mach_timebase_info_data_t tb;
+    uint64_t ticks;
+	uint64_t sec;
+
+	ticks = mach_absolute_time();
+
+	if(tb.denom == 0){
+		mach_timebase_info(&tb);
+	}
+	sec = ticks*tb.numer/tb.denom/1000000000;
+
+	return (time_t)sec;
+#else
+	return time(NULL);
+#endif
+}
+
diff --git a/libs/libmosquitto/src/time_mosq.h b/libs/libmosquitto/src/time_mosq.h
new file mode 100644
index 0000000000..75758a8291
--- /dev/null
+++ b/libs/libmosquitto/src/time_mosq.h
@@ -0,0 +1,22 @@
+/*
+Copyright (c) 2013-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#ifndef TIME_MOSQ_H
+#define TIME_MOSQ_H
+
+time_t mosquitto_time(void);
+
+#endif
diff --git a/libs/libmosquitto/src/tls_mosq.c b/libs/libmosquitto/src/tls_mosq.c
new file mode 100644
index 0000000000..c2f1204f42
--- /dev/null
+++ b/libs/libmosquitto/src/tls_mosq.c
@@ -0,0 +1,183 @@
+/*
+Copyright (c) 2013-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#ifdef WITH_TLS
+
+#include "config.h"
+
+#ifdef WIN32
+#  include <winsock2.h>
+#  include <ws2tcpip.h>
+#else
+#  include <arpa/inet.h>
+#  include <sys/socket.h>
+#  include <strings.h>
+#endif
+
+#include <string.h>
+#include <openssl/conf.h>
+#include <openssl/x509v3.h>
+#include <openssl/ssl.h>
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#endif
+#include "mosquitto_internal.h"
+#include "logging_mosq.h"
+#include "tls_mosq.h"
+
+extern int tls_ex_index_mosq;
+
+int mosquitto__server_certificate_verify(int preverify_ok, X509_STORE_CTX *ctx)
+{
+	/* Preverify should have already checked expiry, revocation.
+	 * We need to verify the hostname. */
+	struct mosquitto *mosq;
+	SSL *ssl;
+	X509 *cert;
+
+	/* Always reject if preverify_ok has failed. */
+	if(!preverify_ok) return 0;
+
+	ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
+	mosq = SSL_get_ex_data(ssl, tls_ex_index_mosq);
+	if(!mosq) return 0;
+
+	if(mosq->tls_insecure == false){
+		if(X509_STORE_CTX_get_error_depth(ctx) == 0){
+			/* FIXME - use X509_check_host() etc. for sufficiently new openssl (>=1.1.x) */
+			cert = X509_STORE_CTX_get_current_cert(ctx);
+			/* This is the peer certificate, all others are upwards in the chain. */
+#if defined(WITH_BROKER)
+			preverify_ok = mosquitto__verify_certificate_hostname(cert, mosq->bridge->addresses[mosq->bridge->cur_address].address);
+#else
+			preverify_ok = mosquitto__verify_certificate_hostname(cert, mosq->host);
+#endif
+			if (preverify_ok != 1) {
+				log__printf(mosq, MOSQ_LOG_ERR, "Error: host name verification failed.");
+			}
+			return preverify_ok;
+		}else{
+			return preverify_ok;
+		}
+	}else{
+		return preverify_ok;
+	}
+}
+
+int mosquitto__cmp_hostname_wildcard(char *certname, const char *hostname)
+{
+	int i;
+	int len;
+
+	if(!certname || !hostname){
+		return 1;
+	}
+
+	if(certname[0] == '*'){
+		if(certname[1] != '.'){
+			return 1;
+		}
+		certname += 2;
+		len = strlen(hostname);
+		for(i=0; i<len-1; i++){
+			if(hostname[i] == '.'){
+				hostname += i+1;
+				break;
+			}
+		}
+		return strcasecmp(certname, hostname);
+	}else{
+		return strcasecmp(certname, hostname);
+	}
+}
+
+/* This code is based heavily on the example provided in "Secure Programming
+ * Cookbook for C and C++".
+ */
+int mosquitto__verify_certificate_hostname(X509 *cert, const char *hostname)
+{
+	int i;
+	char name[256];
+	X509_NAME *subj;
+	bool have_san_dns = false;
+	STACK_OF(GENERAL_NAME) *san;
+	const GENERAL_NAME *nval;
+	const unsigned char *data;
+	unsigned char ipv6_addr[16];
+	unsigned char ipv4_addr[4];
+	int ipv6_ok;
+	int ipv4_ok;
+
+#ifdef WIN32
+	ipv6_ok = InetPton(AF_INET6, hostname, &ipv6_addr);
+	ipv4_ok = InetPton(AF_INET, hostname, &ipv4_addr);
+#else
+	ipv6_ok = inet_pton(AF_INET6, hostname, &ipv6_addr);
+	ipv4_ok = inet_pton(AF_INET, hostname, &ipv4_addr);
+#endif
+
+	san = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
+	if(san){
+		for(i=0; i<sk_GENERAL_NAME_num(san); i++){
+			nval = sk_GENERAL_NAME_value(san, i);
+			if(nval->type == GEN_DNS){
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+				data = ASN1_STRING_data(nval->d.dNSName);
+#else
+				data = ASN1_STRING_get0_data(nval->d.dNSName);
+#endif
+				if(data && !mosquitto__cmp_hostname_wildcard((char *)data, hostname)){
+					sk_GENERAL_NAME_pop_free(san, GENERAL_NAME_free);
+					return 1;
+				}
+				have_san_dns = true;
+			}else if(nval->type == GEN_IPADD){
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+				data = ASN1_STRING_data(nval->d.iPAddress);
+#else
+				data = ASN1_STRING_get0_data(nval->d.iPAddress);
+#endif
+				if(nval->d.iPAddress->length == 4 && ipv4_ok){
+					if(!memcmp(ipv4_addr, data, 4)){
+						sk_GENERAL_NAME_pop_free(san, GENERAL_NAME_free);
+						return 1;
+					}
+				}else if(nval->d.iPAddress->length == 16 && ipv6_ok){
+					if(!memcmp(ipv6_addr, data, 16)){
+						sk_GENERAL_NAME_pop_free(san, GENERAL_NAME_free);
+						return 1;
+					}
+				}
+			}
+		}
+		sk_GENERAL_NAME_pop_free(san, GENERAL_NAME_free);
+		if(have_san_dns){
+			/* Only check CN if subjectAltName DNS entry does not exist. */
+			return 0;
+		}
+	}
+
+	subj = X509_get_subject_name(cert);
+	if(X509_NAME_get_text_by_NID(subj, NID_commonName, name, sizeof(name)) > 0){
+		name[sizeof(name) - 1] = '\0';
+		if (!mosquitto__cmp_hostname_wildcard(name, hostname)) return 1;
+	}
+	return 0;
+}
+
+#endif
+
diff --git a/libs/libmosquitto/src/tls_mosq.h b/libs/libmosquitto/src/tls_mosq.h
new file mode 100644
index 0000000000..5a1cda54fc
--- /dev/null
+++ b/libs/libmosquitto/src/tls_mosq.h
@@ -0,0 +1,36 @@
+/*
+Copyright (c) 2013-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#ifndef TLS_MOSQ_H
+#define TLS_MOSQ_H
+
+#ifdef WITH_TLS
+#  define SSL_DATA_PENDING(A) ((A)->ssl && SSL_pending((A)->ssl))
+#else
+#  define SSL_DATA_PENDING(A) 0
+#endif
+
+#ifdef WITH_TLS
+
+#include <openssl/ssl.h>
+#include <openssl/engine.h>
+
+int mosquitto__server_certificate_verify(int preverify_ok, X509_STORE_CTX *ctx);
+int mosquitto__verify_certificate_hostname(X509 *cert, const char *hostname);
+
+#endif /* WITH_TLS */
+
+#endif
diff --git a/libs/libmosquitto/src/utf8_mosq.c b/libs/libmosquitto/src/utf8_mosq.c
new file mode 100644
index 0000000000..875c1c7f27
--- /dev/null
+++ b/libs/libmosquitto/src/utf8_mosq.c
@@ -0,0 +1,109 @@
+/*
+Copyright (c) 2016-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation.
+*/
+
+#include "config.h"
+
+#include <stdio.h>
+#include "mosquitto.h"
+
+int mosquitto_validate_utf8(const char *str, int len)
+{
+	int i;
+	int j;
+	int codelen;
+	int codepoint;
+	const unsigned char *ustr = (const unsigned char *)str;
+
+	if(!str) return MOSQ_ERR_INVAL;
+	if(len < 0 || len > 65536) return MOSQ_ERR_INVAL;
+
+	for(i=0; i<len; i++){
+		if(ustr[i] == 0){
+			return MOSQ_ERR_MALFORMED_UTF8;
+		}else if(ustr[i] <= 0x7f){
+			codelen = 1;
+			codepoint = ustr[i];
+		}else if((ustr[i] & 0xE0) == 0xC0){
+			/* 110xxxxx - 2 byte sequence */
+			if(ustr[i] == 0xC0 || ustr[i] == 0xC1){
+				/* Invalid bytes */
+				return MOSQ_ERR_MALFORMED_UTF8;
+			}
+			codelen = 2;
+			codepoint = (ustr[i] & 0x1F);
+		}else if((ustr[i] & 0xF0) == 0xE0){
+			// 1110xxxx - 3 byte sequence
+			codelen = 3;
+			codepoint = (ustr[i] & 0x0F);
+		}else if((ustr[i] & 0xF8) == 0xF0){
+			// 11110xxx - 4 byte sequence
+			if(ustr[i] > 0xF4){
+				/* Invalid, this would produce values > 0x10FFFF. */
+				return MOSQ_ERR_MALFORMED_UTF8;
+			}
+			codelen = 4;
+			codepoint = (ustr[i] & 0x07);
+		}else{
+			/* Unexpected continuation byte. */
+			return MOSQ_ERR_MALFORMED_UTF8;
+		}
+
+		/* Reconstruct full code point */
+		if(i == len-codelen+1){
+			/* Not enough data */
+			return MOSQ_ERR_MALFORMED_UTF8;
+		}
+		for(j=0; j<codelen-1; j++){
+			if((ustr[++i] & 0xC0) != 0x80){
+				/* Not a continuation byte */
+				return MOSQ_ERR_MALFORMED_UTF8;
+			}
+			codepoint = (codepoint<<6) | (ustr[i] & 0x3F);
+		}
+		
+		/* Check for UTF-16 high/low surrogates */
+		if(codepoint >= 0xD800 && codepoint <= 0xDFFF){
+			return MOSQ_ERR_MALFORMED_UTF8;
+		}
+
+		/* Check for overlong or out of range encodings */
+		/* Checking codelen == 2 isn't necessary here, because it is already
+		 * covered above in the C0 and C1 checks.
+		 * if(codelen == 2 && codepoint < 0x0080){
+		 *	 return MOSQ_ERR_MALFORMED_UTF8;
+		 * }else
+		*/
+		if(codelen == 3 && codepoint < 0x0800){
+			return MOSQ_ERR_MALFORMED_UTF8;
+		}else if(codelen == 4 && (codepoint < 0x10000 || codepoint > 0x10FFFF)){
+			return MOSQ_ERR_MALFORMED_UTF8;
+		}
+
+		/* Check for non-characters */
+		if(codepoint >= 0xFDD0 && codepoint <= 0xFDEF){
+			return MOSQ_ERR_MALFORMED_UTF8;
+		}
+		if((codepoint & 0xFFFF) == 0xFFFE || (codepoint & 0xFFFF) == 0xFFFF){
+			return MOSQ_ERR_MALFORMED_UTF8;
+		}
+		/* Check for control characters */
+		if(codepoint <= 0x001F || (codepoint >= 0x007F && codepoint <= 0x009F)){
+			return MOSQ_ERR_MALFORMED_UTF8;
+		}
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+
diff --git a/libs/libmosquitto/src/util_mosq.c b/libs/libmosquitto/src/util_mosq.c
new file mode 100644
index 0000000000..5e1065e7c4
--- /dev/null
+++ b/libs/libmosquitto/src/util_mosq.c
@@ -0,0 +1,354 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <string.h>
+
+#ifdef WIN32
+#  include <winsock2.h>
+#  include <aclapi.h>
+#  include <io.h>
+#  include <lmcons.h>
+#else
+#  include <sys/stat.h>
+#endif
+
+#if !defined(WITH_TLS) && defined(__linux__) && defined(__GLIBC__)
+#  if __GLIBC_PREREQ(2, 25)
+#    include <sys/random.h>
+#    define HAVE_GETRANDOM 1
+#  endif
+#endif
+
+#ifdef WITH_TLS
+#  include <openssl/bn.h>
+#  include <openssl/rand.h>
+#endif
+
+#ifdef WITH_BROKER
+#include "mosquitto_broker_internal.h"
+#endif
+
+#include "mosquitto.h"
+#include "memory_mosq.h"
+#include "net_mosq.h"
+#include "send_mosq.h"
+#include "time_mosq.h"
+#include "tls_mosq.h"
+#include "util_mosq.h"
+
+#ifdef WITH_WEBSOCKETS
+#include <libwebsockets.h>
+#endif
+
+#ifdef WITH_BROKER
+int mosquitto__check_keepalive(struct mosquitto_db *db, struct mosquitto *mosq)
+#else
+int mosquitto__check_keepalive(struct mosquitto *mosq)
+#endif
+{
+	time_t next_msg_out;
+	time_t last_msg_in;
+	time_t now = mosquitto_time();
+#ifndef WITH_BROKER
+	int rc;
+#endif
+
+	assert(mosq);
+#if defined(WITH_BROKER) && defined(WITH_BRIDGE)
+	/* Check if a lazy bridge should be timed out due to idle. */
+	if(mosq->bridge && mosq->bridge->start_type == bst_lazy
+				&& mosq->sock != INVALID_SOCKET
+				&& now - mosq->next_msg_out - mosq->keepalive >= mosq->bridge->idle_timeout){
+
+		log__printf(NULL, MOSQ_LOG_NOTICE, "Bridge connection %s has exceeded idle timeout, disconnecting.", mosq->id);
+		net__socket_close(db, mosq);
+		return MOSQ_ERR_SUCCESS;
+	}
+#endif
+	pthread_mutex_lock(&mosq->msgtime_mutex);
+	next_msg_out = mosq->next_msg_out;
+	last_msg_in = mosq->last_msg_in;
+	pthread_mutex_unlock(&mosq->msgtime_mutex);
+	if(mosq->keepalive && mosq->sock != INVALID_SOCKET &&
+			(now >= next_msg_out || now - last_msg_in >= mosq->keepalive)){
+
+		if(mosq->state == mosq_cs_connected && mosq->ping_t == 0){
+			send__pingreq(mosq);
+			/* Reset last msg times to give the server time to send a pingresp */
+			pthread_mutex_lock(&mosq->msgtime_mutex);
+			mosq->last_msg_in = now;
+			mosq->next_msg_out = now + mosq->keepalive;
+			pthread_mutex_unlock(&mosq->msgtime_mutex);
+		}else{
+#ifdef WITH_BROKER
+			net__socket_close(db, mosq);
+#else
+			net__socket_close(mosq);
+			pthread_mutex_lock(&mosq->state_mutex);
+			if(mosq->state == mosq_cs_disconnecting){
+				rc = MOSQ_ERR_SUCCESS;
+			}else{
+				rc = MOSQ_ERR_KEEPALIVE;
+			}
+			pthread_mutex_unlock(&mosq->state_mutex);
+			pthread_mutex_lock(&mosq->callback_mutex);
+			if(mosq->on_disconnect){
+				mosq->in_callback = true;
+				mosq->on_disconnect(mosq, mosq->userdata, rc);
+				mosq->in_callback = false;
+			}
+			if(mosq->on_disconnect_v5){
+				mosq->in_callback = true;
+				mosq->on_disconnect_v5(mosq, mosq->userdata, rc, NULL);
+				mosq->in_callback = false;
+			}
+			pthread_mutex_unlock(&mosq->callback_mutex);
+
+			return rc;
+#endif
+		}
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+
+uint16_t mosquitto__mid_generate(struct mosquitto *mosq)
+{
+	/* FIXME - this would be better with atomic increment, but this is safer
+	 * for now for a bug fix release.
+	 *
+	 * If this is changed to use atomic increment, callers of this function
+	 * will have to be aware that they may receive a 0 result, which may not be
+	 * used as a mid.
+	 */
+	uint16_t mid;
+	assert(mosq);
+
+	pthread_mutex_lock(&mosq->mid_mutex);
+	mosq->last_mid++;
+	if(mosq->last_mid == 0) mosq->last_mid++;
+	mid = mosq->last_mid;
+	pthread_mutex_unlock(&mosq->mid_mutex);
+
+	return mid;
+}
+
+
+#ifdef WITH_TLS
+int mosquitto__hex2bin_sha1(const char *hex, unsigned char **bin)
+{
+	unsigned char *sha, tmp[SHA_DIGEST_LENGTH];
+
+	if(mosquitto__hex2bin(hex, tmp, SHA_DIGEST_LENGTH) != SHA_DIGEST_LENGTH){
+		return MOSQ_ERR_INVAL;
+	}
+
+	sha = mosquitto__malloc(SHA_DIGEST_LENGTH);
+	memcpy(sha, tmp, SHA_DIGEST_LENGTH);
+	*bin = sha;
+	return MOSQ_ERR_SUCCESS;
+}
+
+int mosquitto__hex2bin(const char *hex, unsigned char *bin, int bin_max_len)
+{
+	BIGNUM *bn = NULL;
+	int len;
+	int leading_zero = 0;
+	int start = 0;
+	size_t i = 0;
+
+	/* Count the number of leading zero */
+	for(i=0; i<strlen(hex); i=i+2) {
+		if(strncmp(hex + i, "00", 2) == 0) {
+			leading_zero++;
+			/* output leading zero to bin */
+			bin[start++] = 0;
+		}else{
+			break;
+		}
+	}
+
+	if(BN_hex2bn(&bn, hex) == 0){
+		if(bn) BN_free(bn);
+		return 0;
+	}
+	if(BN_num_bytes(bn) + leading_zero > bin_max_len){
+		BN_free(bn);
+		return 0;
+	}
+
+	len = BN_bn2bin(bn, bin + leading_zero);
+	BN_free(bn);
+	return len + leading_zero;
+}
+#endif
+
+FILE *mosquitto__fopen(const char *path, const char *mode, bool restrict_read)
+{
+#ifdef WIN32
+	char buf[4096];
+	int rc;
+	rc = ExpandEnvironmentStrings(path, buf, 4096);
+	if(rc == 0 || rc > 4096){
+		return NULL;
+	}else{
+		if (restrict_read) {
+			HANDLE hfile;
+			SECURITY_ATTRIBUTES sec;
+			EXPLICIT_ACCESS ea;
+			PACL pacl = NULL;
+			char username[UNLEN + 1];
+			int ulen = UNLEN;
+			SECURITY_DESCRIPTOR sd;
+			DWORD dwCreationDisposition;
+
+			switch(mode[0]){
+				case 'a':
+					dwCreationDisposition = OPEN_ALWAYS;
+					break;
+				case 'r':
+					dwCreationDisposition = OPEN_EXISTING;
+					break;
+				case 'w':
+					dwCreationDisposition = CREATE_ALWAYS;
+					break;
+				default:
+					return NULL;
+			}
+
+			GetUserName(username, &ulen);
+			if (!InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION)) {
+				return NULL;
+			}
+			BuildExplicitAccessWithName(&ea, username, GENERIC_ALL, SET_ACCESS, NO_INHERITANCE);
+			if (SetEntriesInAcl(1, &ea, NULL, &pacl) != ERROR_SUCCESS) {
+				return NULL;
+			}
+			if (!SetSecurityDescriptorDacl(&sd, TRUE, pacl, FALSE)) {
+				LocalFree(pacl);
+				return NULL;
+			}
+
+			sec.nLength = sizeof(SECURITY_ATTRIBUTES);
+			sec.bInheritHandle = FALSE;
+			sec.lpSecurityDescriptor = &sd;
+
+			hfile = CreateFile(buf, GENERIC_READ | GENERIC_WRITE, 0,
+				&sec,
+				dwCreationDisposition,
+				FILE_ATTRIBUTE_NORMAL,
+				NULL);
+
+			LocalFree(pacl);
+
+			int fd = _open_osfhandle((intptr_t)hfile, 0);
+			if (fd < 0) {
+				return NULL;
+			}
+
+			FILE *fptr = _fdopen(fd, mode);
+			if (!fptr) {
+				_close(fd);
+				return NULL;
+			}
+			return fptr;
+
+		}else {
+			return fopen(buf, mode);
+		}
+	}
+#else
+	if (restrict_read) {
+		FILE *fptr;
+		mode_t old_mask;
+
+		old_mask = umask(0077);
+		fptr = fopen(path, mode);
+		umask(old_mask);
+
+		return fptr;
+	}else{
+		return fopen(path, mode);
+	}
+#endif
+}
+
+void util__increment_receive_quota(struct mosquitto *mosq)
+{
+	if(mosq->msgs_in.inflight_quota < mosq->msgs_in.inflight_maximum){
+		mosq->msgs_in.inflight_quota++;
+	}
+}
+
+void util__increment_send_quota(struct mosquitto *mosq)
+{
+	if(mosq->msgs_out.inflight_quota < mosq->msgs_out.inflight_maximum){
+		mosq->msgs_out.inflight_quota++;
+	}
+}
+
+
+void util__decrement_receive_quota(struct mosquitto *mosq)
+{
+	if(mosq->msgs_in.inflight_quota > 0){
+		mosq->msgs_in.inflight_quota--;
+	}
+}
+
+void util__decrement_send_quota(struct mosquitto *mosq)
+{
+	if(mosq->msgs_out.inflight_quota > 0){
+		mosq->msgs_out.inflight_quota--;
+	}
+}
+
+
+int util__random_bytes(void *bytes, int count)
+{
+	int rc = MOSQ_ERR_UNKNOWN;
+
+#ifdef WITH_TLS
+	if(RAND_bytes(bytes, count) == 1){
+		rc = MOSQ_ERR_SUCCESS;
+	}
+#elif defined(HAVE_GETRANDOM)
+	if(getrandom(bytes, count, 0) == count){
+		rc = MOSQ_ERR_SUCCESS;
+	}
+#elif defined(WIN32)
+	HCRYPTPROV provider;
+
+	if(!CryptAcquireContext(&provider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)){
+		return MOSQ_ERR_UNKNOWN;
+	}
+
+	if(CryptGenRandom(provider, count, bytes)){
+		rc = MOSQ_ERR_SUCCESS;
+	}
+
+	CryptReleaseContext(provider, 0);
+#else
+	int i;
+
+	for(i=0; i<count; i++){
+		((uint8_t *)bytes)[i] = (uint8_t )(random()&0xFF);
+	}
+	rc = MOSQ_ERR_SUCCESS;
+#endif
+	return rc;
+}
diff --git a/libs/libmosquitto/src/util_mosq.h b/libs/libmosquitto/src/util_mosq.h
new file mode 100644
index 0000000000..9ee570f3e9
--- /dev/null
+++ b/libs/libmosquitto/src/util_mosq.h
@@ -0,0 +1,47 @@
+/*
+Copyright (c) 2009-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+#ifndef UTIL_MOSQ_H
+#define UTIL_MOSQ_H
+
+#include <stdio.h>
+
+#include "tls_mosq.h"
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#endif
+
+#ifdef WITH_BROKER
+int mosquitto__check_keepalive(struct mosquitto_db *db, struct mosquitto *mosq);
+#else
+int mosquitto__check_keepalive(struct mosquitto *mosq);
+#endif
+uint16_t mosquitto__mid_generate(struct mosquitto *mosq);
+FILE *mosquitto__fopen(const char *path, const char *mode, bool restrict_read);
+
+#ifdef WITH_TLS
+int mosquitto__hex2bin_sha1(const char *hex, unsigned char **bin);
+int mosquitto__hex2bin(const char *hex, unsigned char *bin, int bin_max_len);
+#endif
+
+int util__random_bytes(void *bytes, int count);
+
+void util__increment_receive_quota(struct mosquitto *mosq);
+void util__increment_send_quota(struct mosquitto *mosq);
+void util__decrement_receive_quota(struct mosquitto *mosq);
+void util__decrement_send_quota(struct mosquitto *mosq);
+#endif
diff --git a/libs/libmosquitto/src/util_topic.c b/libs/libmosquitto/src/util_topic.c
new file mode 100644
index 0000000000..67b78782ef
--- /dev/null
+++ b/libs/libmosquitto/src/util_topic.c
@@ -0,0 +1,252 @@
+/*
+Copyright (c) 2009-2018 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <assert.h>
+#include <string.h>
+
+#ifdef WIN32
+#  include <winsock2.h>
+#  include <aclapi.h>
+#  include <io.h>
+#  include <lmcons.h>
+#else
+#  include <sys/stat.h>
+#endif
+
+
+#ifdef WITH_BROKER
+#include "mosquitto_broker_internal.h"
+#endif
+
+#include "mosquitto.h"
+#include "memory_mosq.h"
+#include "net_mosq.h"
+#include "send_mosq.h"
+#include "time_mosq.h"
+#include "tls_mosq.h"
+#include "util_mosq.h"
+
+/* Check that a topic used for publishing is valid.
+ * Search for + or # in a topic. Return MOSQ_ERR_INVAL if found.
+ * Also returns MOSQ_ERR_INVAL if the topic string is too long.
+ * Returns MOSQ_ERR_SUCCESS if everything is fine.
+ */
+int mosquitto_pub_topic_check(const char *str)
+{
+	int len = 0;
+	while(str && str[0]){
+		if(str[0] == '+' || str[0] == '#'){
+			return MOSQ_ERR_INVAL;
+		}
+		len++;
+		str = &str[1];
+	}
+	if(len > 65535) return MOSQ_ERR_INVAL;
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+int mosquitto_pub_topic_check2(const char *str, size_t len)
+{
+	size_t i;
+
+	if(len > 65535) return MOSQ_ERR_INVAL;
+
+	for(i=0; i<len; i++){
+		if(str[i] == '+' || str[i] == '#'){
+			return MOSQ_ERR_INVAL;
+		}
+	}
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+/* Check that a topic used for subscriptions is valid.
+ * Search for + or # in a topic, check they aren't in invalid positions such as
+ * foo/#/bar, foo/+bar or foo/bar#.
+ * Return MOSQ_ERR_INVAL if invalid position found.
+ * Also returns MOSQ_ERR_INVAL if the topic string is too long.
+ * Returns MOSQ_ERR_SUCCESS if everything is fine.
+ */
+int mosquitto_sub_topic_check(const char *str)
+{
+	char c = '\0';
+	int len = 0;
+	while(str && str[0]){
+		if(str[0] == '+'){
+			if((c != '\0' && c != '/') || (str[1] != '\0' && str[1] != '/')){
+				return MOSQ_ERR_INVAL;
+			}
+		}else if(str[0] == '#'){
+			if((c != '\0' && c != '/')  || str[1] != '\0'){
+				return MOSQ_ERR_INVAL;
+			}
+		}
+		len++;
+		c = str[0];
+		str = &str[1];
+	}
+	if(len > 65535) return MOSQ_ERR_INVAL;
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+int mosquitto_sub_topic_check2(const char *str, size_t len)
+{
+	char c = '\0';
+	size_t i;
+
+	if(len > 65535) return MOSQ_ERR_INVAL;
+
+	for(i=0; i<len; i++){
+		if(str[i] == '+'){
+			if((c != '\0' && c != '/') || (i<len-1 && str[i+1] != '/')){
+				return MOSQ_ERR_INVAL;
+			}
+		}else if(str[i] == '#'){
+			if((c != '\0' && c != '/')  || i<len-1){
+				return MOSQ_ERR_INVAL;
+			}
+		}
+		c = str[i];
+	}
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+int mosquitto_topic_matches_sub(const char *sub, const char *topic, bool *result)
+{
+	return mosquitto_topic_matches_sub2(sub, 0, topic, 0, result);
+}
+
+/* Does a topic match a subscription? */
+int mosquitto_topic_matches_sub2(const char *sub, size_t sublen, const char *topic, size_t topiclen, bool *result)
+{
+	size_t spos;
+
+	UNUSED(sublen);
+	UNUSED(topiclen);
+
+	if(!result) return MOSQ_ERR_INVAL;
+	*result = false;
+
+	if(!sub || !topic || sub[0] == 0 || topic[0] == 0){
+		return MOSQ_ERR_INVAL;
+	}
+
+	if((sub[0] == '$' && topic[0] != '$')
+			|| (topic[0] == '$' && sub[0] != '$')){
+
+		return MOSQ_ERR_SUCCESS;
+	}
+
+	spos = 0;
+
+	while(sub[0] != 0){
+		if(topic[0] == '+' || topic[0] == '#'){
+			return MOSQ_ERR_INVAL;
+		}
+		if(sub[0] != topic[0] || topic[0] == 0){ /* Check for wildcard matches */
+			if(sub[0] == '+'){
+				/* Check for bad "+foo" or "a/+foo" subscription */
+				if(spos > 0 && sub[-1] != '/'){
+					return MOSQ_ERR_INVAL;
+				}
+				/* Check for bad "foo+" or "foo+/a" subscription */
+				if(sub[1] != 0 && sub[1] != '/'){
+					return MOSQ_ERR_INVAL;
+				}
+				spos++;
+				sub++;
+				while(topic[0] != 0 && topic[0] != '/'){
+					topic++;
+				}
+				if(topic[0] == 0 && sub[0] == 0){
+					*result = true;
+					return MOSQ_ERR_SUCCESS;
+				}
+			}else if(sub[0] == '#'){
+				/* Check for bad "foo#" subscription */
+				if(spos > 0 && sub[-1] != '/'){
+					return MOSQ_ERR_INVAL;
+				}
+				/* Check for # not the final character of the sub, e.g. "#foo" */
+				if(sub[1] != 0){
+					return MOSQ_ERR_INVAL;
+				}else{
+					*result = true;
+					return MOSQ_ERR_SUCCESS;
+				}
+			}else{
+				/* Check for e.g. foo/bar matching foo/+/# */
+				if(topic[0] == 0
+						&& spos > 0
+						&& sub[-1] == '+'
+						&& sub[0] == '/'
+						&& sub[1] == '#')
+				{
+					*result = true;
+					return MOSQ_ERR_SUCCESS;
+				}
+
+				/* There is no match at this point, but is the sub invalid? */
+				while(sub[0] != 0){
+					if(sub[0] == '#' && sub[1] != 0){
+						return MOSQ_ERR_INVAL;
+					}
+					spos++;
+					sub++;
+				}
+
+				/* Valid input, but no match */
+				return MOSQ_ERR_SUCCESS;
+			}
+		}else{
+			/* sub[spos] == topic[tpos] */
+			if(topic[1] == 0){
+				/* Check for e.g. foo matching foo/# */
+				if(sub[1] == '/'
+						&& sub[2] == '#'
+						&& sub[3] == 0){
+					*result = true;
+					return MOSQ_ERR_SUCCESS;
+				}
+			}
+			spos++;
+			sub++;
+			topic++;
+			if(sub[0] == 0 && topic[0] == 0){
+				*result = true;
+				return MOSQ_ERR_SUCCESS;
+			}else if(topic[0] == 0 && sub[0] == '+' && sub[1] == 0){
+				if(spos > 0 && sub[-1] != '/'){
+					return MOSQ_ERR_INVAL;
+				}
+				spos++;
+				sub++;
+				*result = true;
+				return MOSQ_ERR_SUCCESS;
+			}
+		}
+	}
+	if((topic[0] != 0 || sub[0] != 0)){
+		*result = false;
+	}
+
+	return MOSQ_ERR_SUCCESS;
+}
diff --git a/libs/libmosquitto/src/will_mosq.c b/libs/libmosquitto/src/will_mosq.c
new file mode 100644
index 0000000000..f9f1f32a56
--- /dev/null
+++ b/libs/libmosquitto/src/will_mosq.c
@@ -0,0 +1,126 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#ifdef WITH_BROKER
+#  include "mosquitto_broker_internal.h"
+#endif
+
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+#include "logging_mosq.h"
+#include "messages_mosq.h"
+#include "memory_mosq.h"
+#include "mqtt_protocol.h"
+#include "net_mosq.h"
+#include "read_handle.h"
+#include "send_mosq.h"
+#include "util_mosq.h"
+#include "will_mosq.h"
+
+int will__set(struct mosquitto *mosq, const char *topic, int payloadlen, const void *payload, int qos, bool retain, mosquitto_property *properties)
+{
+	int rc = MOSQ_ERR_SUCCESS;
+	mosquitto_property *p;
+
+	if(!mosq || !topic) return MOSQ_ERR_INVAL;
+	if(payloadlen < 0 || payloadlen > MQTT_MAX_PAYLOAD) return MOSQ_ERR_PAYLOAD_SIZE;
+	if(payloadlen > 0 && !payload) return MOSQ_ERR_INVAL;
+
+	if(mosquitto_pub_topic_check(topic)) return MOSQ_ERR_INVAL;
+	if(mosquitto_validate_utf8(topic, strlen(topic))) return MOSQ_ERR_MALFORMED_UTF8;
+
+	if(properties){
+		if(mosq->protocol != mosq_p_mqtt5){
+			return MOSQ_ERR_NOT_SUPPORTED;
+		}
+		p = properties;
+		while(p){
+			rc = mosquitto_property_check_command(CMD_WILL, p->identifier);
+			if(rc) return rc;
+			p = p->next;
+		}
+	}
+
+	if(mosq->will){
+		mosquitto__free(mosq->will->msg.topic);
+		mosquitto__free(mosq->will->msg.payload);
+		mosquitto_property_free_all(&mosq->will->properties);
+		mosquitto__free(mosq->will);
+	}
+
+	mosq->will = mosquitto__calloc(1, sizeof(struct mosquitto_message_all));
+	if(!mosq->will) return MOSQ_ERR_NOMEM;
+	mosq->will->msg.topic = mosquitto__strdup(topic);
+	if(!mosq->will->msg.topic){
+		rc = MOSQ_ERR_NOMEM;
+		goto cleanup;
+	}
+	mosq->will->msg.payloadlen = payloadlen;
+	if(mosq->will->msg.payloadlen > 0){
+		if(!payload){
+			rc = MOSQ_ERR_INVAL;
+			goto cleanup;
+		}
+		mosq->will->msg.payload = mosquitto__malloc(sizeof(char)*mosq->will->msg.payloadlen);
+		if(!mosq->will->msg.payload){
+			rc = MOSQ_ERR_NOMEM;
+			goto cleanup;
+		}
+
+		memcpy(mosq->will->msg.payload, payload, payloadlen);
+	}
+	mosq->will->msg.qos = qos;
+	mosq->will->msg.retain = retain;
+
+	mosq->will->properties = properties;
+
+	return MOSQ_ERR_SUCCESS;
+
+cleanup:
+	if(mosq->will){
+		mosquitto__free(mosq->will->msg.topic);
+		mosquitto__free(mosq->will->msg.payload);
+
+		mosquitto__free(mosq->will);
+		mosq->will = NULL;
+	}
+
+	return rc;
+}
+
+int will__clear(struct mosquitto *mosq)
+{
+	if(!mosq->will) return MOSQ_ERR_SUCCESS;
+
+	mosquitto__free(mosq->will->msg.topic);
+	mosq->will->msg.topic = NULL;
+
+	mosquitto__free(mosq->will->msg.payload);
+	mosq->will->msg.payload = NULL;
+
+	mosquitto_property_free_all(&mosq->will->properties);
+
+	mosquitto__free(mosq->will);
+	mosq->will = NULL;
+
+	return MOSQ_ERR_SUCCESS;
+}
+
diff --git a/libs/libmosquitto/src/will_mosq.h b/libs/libmosquitto/src/will_mosq.h
new file mode 100644
index 0000000000..c96dad1a71
--- /dev/null
+++ b/libs/libmosquitto/src/will_mosq.h
@@ -0,0 +1,26 @@
+/*
+Copyright (c) 2010-2019 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+ 
+The Eclipse Public License is available at
+   http://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+#ifndef WILL_MOSQ_H
+#define WILL_MOSQ_H
+
+#include "mosquitto.h"
+#include "mosquitto_internal.h"
+
+int will__set(struct mosquitto *mosq, const char *topic, int payloadlen, const void *payload, int qos, bool retain, mosquitto_property *properties);
+int will__clear(struct mosquitto *mosq);
+
+#endif