mirror of https://github.com/eclipse/paho.mqtt.c
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110 lines
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<title>MQTT Client: Asynchronous publication example</title>
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<li class="current"><a href="pages.html"><span>Related Pages</span></a></li>
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<li><a href="annotated.html"><span>Data Structures</span></a></li>
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<h1><a class="anchor" id="pubasync">Asynchronous publication example </a></h1><div class="fragment"><pre class="fragment"><span class="preprocessor">#include "stdio.h"</span>
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<span class="preprocessor">#include "stdlib.h"</span>
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<span class="preprocessor">#include "string.h"</span>
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<span class="preprocessor">#include "<a class="code" href="_m_q_t_t_client_8h.html">MQTTClient.h</a>"</span>
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<span class="preprocessor">#define ADDRESS "tcp://localhost:1883"</span>
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<span class="preprocessor"></span><span class="preprocessor">#define CLIENTID "ExampleClientPub"</span>
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<span class="preprocessor"></span><span class="preprocessor">#define TOPIC "MQTT Examples"</span>
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<span class="preprocessor"></span><span class="preprocessor">#define PAYLOAD "Hello World!"</span>
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<span class="preprocessor"></span><span class="preprocessor">#define QOS 1</span>
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<span class="preprocessor"></span><span class="preprocessor">#define TIMEOUT 10000L</span>
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<span class="preprocessor"></span>
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<span class="keyword">volatile</span> <a class="code" href="_m_q_t_t_client_8h.html#a73e49030fd8b7074aa1aa45669b7fe8d">MQTTClient_deliveryToken</a> deliveredtoken;
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<span class="keywordtype">void</span> delivered(<span class="keywordtype">void</span> *context, <a class="code" href="_m_q_t_t_client_8h.html#a73e49030fd8b7074aa1aa45669b7fe8d">MQTTClient_deliveryToken</a> dt)
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{
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printf(<span class="stringliteral">"Message with token value %d delivery confirmed\n"</span>, dt);
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deliveredtoken = dt;
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}
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<span class="keywordtype">int</span> msgarrvd(<span class="keywordtype">void</span> *context, <span class="keywordtype">char</span> *topicName, <span class="keywordtype">int</span> topicLen, <a class="code" href="struct_m_q_t_t_client__message.html">MQTTClient_message</a> *message)
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{
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<span class="keywordtype">int</span> i;
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<span class="keywordtype">char</span>* payloadptr;
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printf(<span class="stringliteral">"Message arrived\n"</span>);
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printf(<span class="stringliteral">" topic: %s\n"</span>, topicName);
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printf(<span class="stringliteral">" message: "</span>);
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payloadptr = message-><a class="code" href="struct_m_q_t_t_client__message.html#a9eff55064941fb604452abb0050ea99d">payload</a>;
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<span class="keywordflow">for</span>(i=0; i<message-><a class="code" href="struct_m_q_t_t_client__message.html#aa3cb44feb3ae6d11b3a4cad2d94cb33a">payloadlen</a>; i++)
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{
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putchar(*payloadptr++);
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}
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putchar(<span class="charliteral">'\n'</span>);
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<a class="code" href="_m_q_t_t_client_8h.html#abd8abde4f39d3e689029de27f7a98a65">MQTTClient_freeMessage</a>(&message);
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<a class="code" href="_m_q_t_t_client_8h.html#a203b545c999beb6b825ec99b6aea79ab">MQTTClient_free</a>(topicName);
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<span class="keywordflow">return</span> 1;
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}
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<span class="keywordtype">void</span> connlost(<span class="keywordtype">void</span> *context, <span class="keywordtype">char</span> *cause)
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{
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printf(<span class="stringliteral">"\nConnection lost\n"</span>);
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printf(<span class="stringliteral">" cause: %s\n"</span>, cause);
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}
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<span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span>* argv[])
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{
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<a class="code" href="_m_q_t_t_client_8h.html#a7649e3913f9a216424d296f88a969c59">MQTTClient</a> client;
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<a class="code" href="struct_m_q_t_t_client__connect_options.html">MQTTClient_connectOptions</a> conn_opts = <a class="code" href="_m_q_t_t_client_8h.html#aefd7c865f2641c8155b763fdf3061c25">MQTTClient_connectOptions_initializer</a>;
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<a class="code" href="struct_m_q_t_t_client__message.html">MQTTClient_message</a> pubmsg = <a class="code" href="_m_q_t_t_client_8h.html#aa1fd995924d3df75959fcf57e87aefac">MQTTClient_message_initializer</a>;
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<a class="code" href="_m_q_t_t_client_8h.html#a73e49030fd8b7074aa1aa45669b7fe8d">MQTTClient_deliveryToken</a> token;
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<span class="keywordtype">int</span> rc;
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<a class="code" href="_m_q_t_t_client_8h.html#a5cb44bc0e06bcc95a314d51320a0cd1b">MQTTClient_create</a>(&client, ADDRESS, CLIENTID,
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<a class="code" href="_m_q_t_t_client_persistence_8h.html#ae01e089313a65ac4661ed216b6ac00fa">MQTTCLIENT_PERSISTENCE_NONE</a>, NULL);
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conn_opts.<a class="code" href="struct_m_q_t_t_client__connect_options.html#ac8dd0930672a9c7d71fc645aa1f0521d">keepAliveInterval</a> = 20;
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conn_opts.<a class="code" href="struct_m_q_t_t_client__connect_options.html#a036c36a2a4d3a3ffae9ab4dd8b3e7f7b">cleansession</a> = 1;
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<a class="code" href="_m_q_t_t_client_8h.html#aad27d07782991a4937ebf2f39a021f83">MQTTClient_setCallbacks</a>(client, NULL, connlost, msgarrvd, delivered);
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<span class="keywordflow">if</span> ((rc = <a class="code" href="_m_q_t_t_client_8h.html#aaa8ae61cd65c9dc0846df10122d7bd4e">MQTTClient_connect</a>(client, &conn_opts)) != <a class="code" href="_m_q_t_t_client_8h.html#acba095704d79e5a1996389fa26203f73">MQTTCLIENT_SUCCESS</a>)
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{
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printf(<span class="stringliteral">"Failed to connect, return code %d\n"</span>, rc);
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exit(-1);
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}
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pubmsg.<a class="code" href="struct_m_q_t_t_client__message.html#a9eff55064941fb604452abb0050ea99d">payload</a> = PAYLOAD;
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pubmsg.<a class="code" href="struct_m_q_t_t_client__message.html#aa3cb44feb3ae6d11b3a4cad2d94cb33a">payloadlen</a> = strlen(PAYLOAD);
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pubmsg.<a class="code" href="struct_m_q_t_t_client__message.html#a35738099155a0e4f54050da474bab2e7">qos</a> = QOS;
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pubmsg.<a class="code" href="struct_m_q_t_t_client__message.html#a6a4904c112507a43e7dc8495b62cc0fc">retained</a> = 0;
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deliveredtoken = 0;
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<a class="code" href="_m_q_t_t_client_8h.html#a288d6c8d4919f06e991be2435f649676">MQTTClient_publishMessage</a>(client, TOPIC, &pubmsg, &token);
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printf(<span class="stringliteral">"Waiting for publication of %s\n"</span>
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<span class="stringliteral">"on topic %s for client with ClientID: %s\n"</span>,
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PAYLOAD, TOPIC, CLIENTID);
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<span class="keywordflow">while</span>(deliveredtoken != token);
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<a class="code" href="_m_q_t_t_client_8h.html#a1e4d90c13a3c0705bc4a13bfe64e6525">MQTTClient_disconnect</a>(client, 10000);
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<a class="code" href="_m_q_t_t_client_8h.html#ae700c3f5cfea3813264ce95e7c8cf498">MQTTClient_destroy</a>(&client);
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<span class="keywordflow">return</span> rc;
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}
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</pre></div> </div>
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<hr class="footer"/><address style="text-align: right;"><small>Generated on Tue Jul 3 15:17:14 2012 for MQTT Client by
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.3 </small></address>
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