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libmosquitto.3.xml
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libmosquitto.3.xml
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<?xml version='1.0' encoding='UTF-8'?>
<?xml-stylesheet type="text/xsl" href="manpage.xsl"?>
<refentry xml:id="libmosquitto" xmlns:xlink="http:https://www.w3.org/1999/xlink">
<refmeta>
<refentrytitle>libmosquitto</refentrytitle>
<manvolnum>3</manvolnum>
<refmiscinfo class="source">Mosquitto Project</refmiscinfo>
<refmiscinfo class="manual">Library calls</refmiscinfo>
</refmeta>
<refnamediv>
<refname>libmosquitto</refname>
<refpurpose>MQTT version 3.1.1 client library</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>This is an overview of how to use libmosquitto to create MQTT
aware client programs. There may be separate man pages on each of the
functions described here in the future. There is also a binding for
libmosquitto for C++ and a Python implementation. They are not
documented here but operate in a similar way.</para>
<para>This is fairly incomplete, please see mosquitto.h for a better
description of the functions.</para>
</refsect1>
<refsect1>
<title>libmosquitto symbol names</title>
<para>All public functions in libmosquitto have the prefix
"mosquitto_". Any other functions defined in the source code are to be
treated as private functions and may change between any release. Do not
use these functions!</para>
</refsect1>
<refsect1>
<title>Functions</title>
<refsect2>
<title>Library version</title>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_lib_version</function></funcdef>
<paramdef>int *<parameter>major</parameter></paramdef>
<paramdef>int *<parameter>minor</parameter></paramdef>
<paramdef>int *<parameter>revision</parameter></paramdef>
</funcprototype></funcsynopsis>
<para>Obtain version information about the library. If any of
major, minor or revision are not NULL they will return the
corresponding version numbers. The return value is an integer
representation of the complete version number (e.g. 1009001 for 1.9.1)
that can be used for comparisons.</para>
</refsect2>
<refsect2>
<title>Library initialisation and cleanup</title>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_lib_init</function></funcdef>
<void/></funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_lib_cleanup</function></funcdef>
<void/></funcprototype></funcsynopsis>
<para>Call mosquitto_lib_init() before using any of the other
library functions and mosquitto_lib_cleanup() after finishing
with the library.</para>
</refsect2>
<refsect2>
<title>Client constructor/destructor</title>
<funcsynopsis><funcprototype><funcdef>struct mosquitto *<function>mosquitto_new</function></funcdef>
<paramdef>const char *<parameter>id</parameter></paramdef>
<paramdef>bool <parameter>clean_session</parameter></paramdef>
<paramdef>void *<parameter>userdata</parameter></paramdef>
</funcprototype></funcsynopsis>
<para>Create a new mosquitto client instance.</para>
<funcsynopsis><funcprototype><funcdef>void <function>mosquitto_destroy</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
</funcprototype></funcsynopsis>
<para>Use to free memory associated with a mosquitto client instance.</para>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_reinitialise</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>const char *<parameter>id</parameter></paramdef>
<paramdef>bool <parameter>clean_session</parameter></paramdef>
<paramdef>void *<parameter>userdata</parameter></paramdef>
</funcprototype></funcsynopsis>
</refsect2>
<refsect2>
<title>Authentication and encryption</title>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_username_pw_set</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>const char *<parameter>username</parameter></paramdef>
<paramdef>const char *<parameter>password</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_tls_set</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>const char *<parameter>cafile</parameter></paramdef>
<paramdef>const char *<parameter>capath</parameter></paramdef>
<paramdef>const char *<parameter>certfile</parameter></paramdef>
<paramdef>const char *<parameter>keyfile</parameter></paramdef>
<paramdef>int <parameter>(*pw_callback)(char *buf, int size, int rwflag, void *userdata)</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_tls_opts_set</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>int <parameter>cert_reqs</parameter></paramdef>
<paramdef>const char *<parameter>tls_version</parameter></paramdef>
<paramdef>const char *<parameter>ciphers</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_tls_insecure_set</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>bool <parameter>value</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_tls_psk_set</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>const char *<parameter>psk</parameter></paramdef>
<paramdef>const char *<parameter>identity</parameter></paramdef>
<paramdef>const char *<parameter>ciphers</parameter></paramdef>
</funcprototype></funcsynopsis>
</refsect2>
<refsect2>
<title>Wills</title>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_will_set</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>const char *<parameter>topic</parameter></paramdef>
<paramdef>int <parameter>payloadlen</parameter></paramdef>
<paramdef>const void *<parameter>payload</parameter></paramdef>
<paramdef>int <parameter>qos</parameter></paramdef>
<paramdef>bool <parameter>retain</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_will_clear</function></funcdef>
<paramdef><parameter>struct mosquitto *mosq</parameter></paramdef>
</funcprototype></funcsynopsis>
</refsect2>
<refsect2>
<title>Connect/disconnect</title>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_connect</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>const char *<parameter>host</parameter></paramdef>
<paramdef>int <parameter>port</parameter></paramdef>
<paramdef>int <parameter>keepalive</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_connect_bind</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>const char *<parameter>host</parameter></paramdef>
<paramdef>int <parameter>port</parameter></paramdef>
<paramdef>int <parameter>keepalive</parameter></paramdef>
<paramdef>const char *<parameter>bind_address</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_connect_async</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>const char *<parameter>host</parameter></paramdef>
<paramdef>int <parameter>port</parameter></paramdef>
<paramdef>int <parameter>keepalive</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_connect_bind_async</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>const char *<parameter>host</parameter></paramdef>
<paramdef>int <parameter>port</parameter></paramdef>
<paramdef>int <parameter>keepalive</parameter></paramdef>
<paramdef>const char *<parameter>bind_address</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_reconnect</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_reconnect_async</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_disconnect</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
</funcprototype></funcsynopsis>
</refsect2>
<refsect2>
<title>Publish</title>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_publish</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>int *<parameter>mid</parameter></paramdef>
<paramdef>const char *<parameter>topic</parameter></paramdef>
<paramdef>int <parameter>payloadlen</parameter></paramdef>
<paramdef>const void *<parameter>payload</parameter></paramdef>
<paramdef>int <parameter>qos</parameter></paramdef>
<paramdef>bool <parameter>retain</parameter></paramdef>
</funcprototype></funcsynopsis>
</refsect2>
<refsect2>
<title>Subscribe/unsubscribe</title>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_subscribe</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>int *<parameter>mid</parameter></paramdef>
<paramdef>const char *<parameter>sub</parameter></paramdef>
<paramdef>int <parameter>qos</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_unsubscribe</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>int *<parameter>mid</parameter></paramdef>
<paramdef>const char *<parameter>sub</parameter></paramdef>
</funcprototype></funcsynopsis>
</refsect2>
<refsect2>
<title>Network loop</title>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_loop</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>int <parameter>timeout</parameter></paramdef>
<paramdef>int <parameter>max_packets</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_loop_read</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>int <parameter>max_packets</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_loop_write</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>int <parameter>max_packets</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_loop_misc</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_loop_forever</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>int <parameter>timeout</parameter></paramdef>
<paramdef>int <parameter>max_packets</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_socket</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>bool <function>mosquitto_want_write</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
</funcprototype></funcsynopsis>
</refsect2>
<refsect2>
<title>Threaded network loop</title>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_loop_start</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_loop_stop</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>bool <parameter>force</parameter></paramdef>
</funcprototype></funcsynopsis>
</refsect2>
<refsect2>
<title>Misc client functions</title>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_max_inflight_messages_set</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>unsigned int <parameter>max_inflight_messages</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_reconnect_delay_set</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>unsigned int <parameter>reconnect_delay</parameter></paramdef>
<paramdef>unsigned int <parameter>reconnect_delay_max</parameter></paramdef>
<paramdef>bool <parameter>reconnect_exponential_backoff</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_user_data_set</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>void *<parameter>userdata</parameter></paramdef>
</funcprototype></funcsynopsis>
</refsect2>
<refsect2>
<title>Callbacks</title>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_connect_callback_set</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>void <parameter>(*on_connect)(struct mosquitto *, void *, int)</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_disconnect_callback_set</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>void <parameter>(*on_disconnect)(struct mosquitto *, void *, int)</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_publish_callback_set</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>void <parameter>(*on_publish)(struct mosquitto *, void *, int)</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_message_callback_set</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>void <parameter>(*on_message)(struct mosquitto *, void *, const struct mosquitto_message *)</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_subscribe_callback_set</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>void <parameter>(*on_subscribe)(struct mosquitto *, void *, int, int, const int *)</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_unsubscribe_callback_set</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>void <parameter>(*on_unsubscribe)(struct mosquitto *, void *, int)</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_log_callback_set</function></funcdef>
<paramdef>struct mosquitto *<parameter>mosq</parameter></paramdef>
<paramdef>void <parameter>(*on_unsubscribe)(struct mosquitto *, void *, int, const char *)</parameter></paramdef>
</funcprototype></funcsynopsis>
</refsect2>
<refsect2>
<title>Utility functions</title>
<funcsynopsis><funcprototype><funcdef>const char *<function>mosquitto_connack_string</function></funcdef>
<paramdef>int <parameter>connack_code</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_message_copy</function></funcdef>
<paramdef>struct mosquitto_message *<parameter>dst</parameter></paramdef>
<paramdef>const struct mosquitto_message *<parameter>src</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_message_free</function></funcdef>
<paramdef>struct mosquitto_message **<parameter>message</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>const char *<function>mosquitto_strerror</function></funcdef>
<paramdef>int <parameter>mosq_errno</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_sub_topic_tokenise</function></funcdef>
<paramdef>const char *<parameter>subtopic</parameter></paramdef>
<paramdef>char ***<parameter>topics</parameter></paramdef>
<paramdef>int *<parameter>count</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_sub_topic_tokens_free</function></funcdef>
<paramdef>char ***<parameter>topics</parameter></paramdef>
<paramdef>int <parameter>count</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_topic_matches_sub</function></funcdef>
<paramdef>const char *<parameter>sub</parameter></paramdef>
<paramdef>const char *<parameter>topic</parameter></paramdef>
<paramdef>bool *<parameter>result</parameter></paramdef>
</funcprototype></funcsynopsis>
</refsect2>
<refsect2>
<title>Helper functions</title>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_subscribe_simple</function></funcdef>
<paramdef>struct mosquitto_message **<parameter>message</parameter></paramdef>
<paramdef>int <parameter>msg_count</parameter></paramdef>
<paramdef>bool <parameter>want_retained</parameter></paramdef>
<paramdef>const char *<parameter>topic</parameter></paramdef>
<paramdef>int<parameter>qos</parameter></paramdef>
<paramdef>const char *<parameter>host</parameter></paramdef>
<paramdef>int <parameter>port</parameter></paramdef>
<paramdef>const char *<parameter>client_id</parameter></paramdef>
<paramdef>int <parameter>keepalive</parameter></paramdef>
<paramdef>bool <parameter>clean_session</parameter></paramdef>
<paramdef>const char *<parameter>username</parameter></paramdef>
<paramdef>const char *<parameter>password</parameter></paramdef>
<paramdef>const struct libmosquitto_will *<parameter>will</parameter></paramdef>
<paramdef>const struct libmosquitto_tls *<parameter>tls</parameter></paramdef>
</funcprototype></funcsynopsis>
<funcsynopsis><funcprototype><funcdef>int <function>mosquitto_subscribe_callback</function></funcdef>
<paramdef>int <parameter>(*callback)(struct mosquitto *, void *, const struct mosquitto_message *)</parameter></paramdef>
<paramdef>void *<parameter>userdata</parameter></paramdef>
<paramdef>const char *<parameter>topic</parameter></paramdef>
<paramdef>int <parameter>qos</parameter></paramdef>
<paramdef>const char *<parameter>host</parameter></paramdef>
<paramdef>int <parameter>port</parameter></paramdef>
<paramdef>const char *<parameter>client_id</parameter></paramdef>
<paramdef>int <parameter>keepalive</parameter></paramdef>
<paramdef>bool <parameter>clean_session</parameter></paramdef>
<paramdef>const char *<parameter>username</parameter></paramdef>
<paramdef>const char *<parameter>password</parameter></paramdef>
<paramdef>const struct libmosquitto_will *<parameter>will</parameter></paramdef>
<paramdef>const struct libmosquitto_tls *<parameter>tls</parameter></paramdef>
</funcprototype></funcsynopsis>
</refsect2>
</refsect1>
<refsect1>
<title>Examples</title>
<para><programlisting language="C">
#include <stdio.h>
#include <mosquitto.h>
void my_message_callback(struct mosquitto *mosq, void *userdata, const struct mosquitto_message *message)
{
if(message->payloadlen){
printf("%s %s\n", message->topic, message->payload);
}else{
printf("%s (null)\n", message->topic);
}
fflush(stdout);
}
void my_connect_callback(struct mosquitto *mosq, void *userdata, int result)
{
int i;
if(!result){
/* Subscribe to broker information topics on successful connect. */
mosquitto_subscribe(mosq, NULL, "$SYS/#", 2);
}else{
fprintf(stderr, "Connect failed\n");
}
}
void my_subscribe_callback(struct mosquitto *mosq, void *userdata, int mid, int qos_count, const int *granted_qos)
{
int i;
printf("Subscribed (mid: %d): %d", mid, granted_qos[0]);
for(i=1; i<qos_count; i++){
printf(", %d", granted_qos[i]);
}
printf("\n");
}
void my_log_callback(struct mosquitto *mosq, void *userdata, int level, const char *str)
{
/* Pring all log messages regardless of level. */
printf("%s\n", str);
}
int main(int argc, char *argv[])
{
int i;
char *host = "localhost";
int port = 1883;
int keepalive = 60;
bool clean_session = true;
struct mosquitto *mosq = NULL;
mosquitto_lib_init();
mosq = mosquitto_new(NULL, clean_session, NULL);
if(!mosq){
fprintf(stderr, "Error: Out of memory.\n");
return 1;
}
mosquitto_log_callback_set(mosq, my_log_callback);
mosquitto_connect_callback_set(mosq, my_connect_callback);
mosquitto_message_callback_set(mosq, my_message_callback);
mosquitto_subscribe_callback_set(mosq, my_subscribe_callback);
if(mosquitto_connect(mosq, host, port, keepalive)){
fprintf(stderr, "Unable to connect.\n");
return 1;
}
mosquitto_loop_forever(mosq, -1, 1);
mosquitto_destroy(mosq);
mosquitto_lib_cleanup();
return 0;
}
</programlisting></para>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member>
<citerefentry>
<refentrytitle><link xlink:href="mosquitto-8.html">mosquitto</link></refentrytitle>
<manvolnum>8</manvolnum>
</citerefentry>
<citerefentry>
<refentrytitle><link xlink:href="mqtt-7.html">mqtt</link></refentrytitle>
<manvolnum>7</manvolnum>
</citerefentry>
</member>
</simplelist>
</refsect1>
<refsect1>
<title>Author</title>
<para>Roger Light <email>[email protected]</email></para>
</refsect1>
</refentry>