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<div id="projectname">coreMQTT<span id="projectnumber"> v2.2.0</span>
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<div id="projectbrief">MQTT 3.1.1 Client Library</div>
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<div class="headertitle"><div class="title">MQTT_Publish </div></div>
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<div class="textblock"><div class="fragment"><div class="line"><a class="code hl_enumeration" href="group__mqtt__enum__types.html#gaba7ec045874a1c3432f99173367f735c">MQTTStatus_t</a> <a class="code hl_function" href="core__mqtt_8h.html#a1d8217e9d30fb2aed002060a8c97c63e">MQTT_Publish</a>( <a class="code hl_struct" href="struct_m_q_t_t_context__t.html">MQTTContext_t</a> * pContext,</div>
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<div class="line"> <span class="keyword">const</span> <a class="code hl_struct" href="struct_m_q_t_t_publish_info__t.html">MQTTPublishInfo_t</a> * pPublishInfo,</div>
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<div class="line"> uint16_t packetId );</div>
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<div class="ttc" id="acore__mqtt_8h_html_a1d8217e9d30fb2aed002060a8c97c63e"><div class="ttname"><a href="core__mqtt_8h.html#a1d8217e9d30fb2aed002060a8c97c63e">MQTT_Publish</a></div><div class="ttdeci">MQTTStatus_t MQTT_Publish(MQTTContext_t *pContext, const MQTTPublishInfo_t *pPublishInfo, uint16_t packetId)</div><div class="ttdoc">Publishes a message to the given topic name.</div><div class="ttdef"><b>Definition:</b> core_mqtt.c:2805</div></div>
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<div class="ttc" id="agroup__mqtt__enum__types_html_gaba7ec045874a1c3432f99173367f735c"><div class="ttname"><a href="group__mqtt__enum__types.html#gaba7ec045874a1c3432f99173367f735c">MQTTStatus_t</a></div><div class="ttdeci">MQTTStatus_t</div><div class="ttdoc">Return codes from MQTT functions.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:87</div></div>
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<div class="ttc" id="astruct_m_q_t_t_context__t_html"><div class="ttname"><a href="struct_m_q_t_t_context__t.html">MQTTContext_t</a></div><div class="ttdoc">A struct representing an MQTT connection.</div><div class="ttdef"><b>Definition:</b> core_mqtt.h:170</div></div>
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<div class="ttc" id="astruct_m_q_t_t_publish_info__t_html"><div class="ttname"><a href="struct_m_q_t_t_publish_info__t.html">MQTTPublishInfo_t</a></div><div class="ttdoc">MQTT PUBLISH packet parameters.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:202</div></div>
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</div><!-- fragment --><p>Publishes a message to the given topic name. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in]</td><td class="paramname">pContext</td><td>Initialized MQTT context. </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">pPublishInfo</td><td>MQTT PUBLISH packet parameters. </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">packetId</td><td>packet ID generated by <a class="el" href="core__mqtt_8h.html#a00e1a3eba2c21899a6b4312c7d65d090" title="Get a packet ID that is valid according to the MQTT 3.1.1 spec.">MQTT_GetPacketId</a>.</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd><a class="el" href="group__mqtt__enum__types.html#ggaba7ec045874a1c3432f99173367f735cab1be4db832a0468f024243bca151a8df">MQTTNoMemory</a> if pBuffer is too small to hold the MQTT packet; <a class="el" href="group__mqtt__enum__types.html#ggaba7ec045874a1c3432f99173367f735caa39030c93b0263b2699502a074f003b5">MQTTBadParameter</a> if invalid parameters are passed; <a class="el" href="group__mqtt__enum__types.html#ggaba7ec045874a1c3432f99173367f735cafd06b63fe9677fa2af06b0f4c7d4ad55">MQTTSendFailed</a> if transport write failed; <a class="el" href="group__mqtt__enum__types.html#ggaba7ec045874a1c3432f99173367f735ca484e062cb4f3fccc1858dd25cfeee056">MQTTSuccess</a> otherwise.</dd></dl>
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<p><b>Example</b> </p><div class="fragment"><div class="line"><span class="comment">// Variables used in this example.</span></div>
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<div class="line"><a class="code hl_enumeration" href="group__mqtt__enum__types.html#gaba7ec045874a1c3432f99173367f735c">MQTTStatus_t</a> status;</div>
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<div class="line"><a class="code hl_struct" href="struct_m_q_t_t_publish_info__t.html">MQTTPublishInfo_t</a> publishInfo;</div>
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<div class="line">uint16_t packetId;</div>
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<div class="line"><span class="comment">// This context is assumed to be initialized and connected.</span></div>
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<div class="line"><a class="code hl_struct" href="struct_m_q_t_t_context__t.html">MQTTContext_t</a> * pContext;</div>
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<div class="line"> </div>
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<div class="line"><span class="comment">// QoS of publish.</span></div>
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<div class="line">publishInfo.<a class="code hl_variable" href="struct_m_q_t_t_publish_info__t.html#a178224d02b4acdec7e08e88de0e4b399">qos</a> = <a class="code hl_enumvalue" href="group__mqtt__enum__types.html#ggae308a5928d7f537379c29a894228093aa019d0b8a8cfadb6f98462b046bdacbb2">MQTTQoS1</a>;</div>
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<div class="line">publishInfo.<a class="code hl_variable" href="struct_m_q_t_t_publish_info__t.html#aa80e8ca282d01630f878ad0afe81d7a4">pTopicName</a> = <span class="stringliteral">"/some/topic/name"</span>;</div>
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<div class="line">publishInfo.<a class="code hl_variable" href="struct_m_q_t_t_publish_info__t.html#a6161c792d20cc7cf8284c1b71ea1145f">topicNameLength</a> = strlen( publishInfo.<a class="code hl_variable" href="struct_m_q_t_t_publish_info__t.html#aa80e8ca282d01630f878ad0afe81d7a4">pTopicName</a> );</div>
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<div class="line">publishInfo.<a class="code hl_variable" href="struct_m_q_t_t_publish_info__t.html#afc28299f4f625f5e674bb61b42f03380">pPayload</a> = <span class="stringliteral">"Hello World!"</span>;</div>
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<div class="line">publishInfo.<a class="code hl_variable" href="struct_m_q_t_t_publish_info__t.html#a7997964e11571f35f0c3b729db0f760f">payloadLength</a> = strlen( <span class="stringliteral">"Hello World!"</span> );</div>
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<div class="line"> </div>
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<div class="line"><span class="comment">// Packet ID is needed for QoS > 0.</span></div>
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<div class="line">packetId = <a class="code hl_function" href="core__mqtt_8h.html#a00e1a3eba2c21899a6b4312c7d65d090">MQTT_GetPacketId</a>( pContext );</div>
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<div class="line"> </div>
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<div class="line">status = <a class="code hl_function" href="core__mqtt_8h.html#a1d8217e9d30fb2aed002060a8c97c63e">MQTT_Publish</a>( pContext, &publishInfo, packetId );</div>
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<div class="line"> </div>
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<div class="line"><span class="keywordflow">if</span>( status == <a class="code hl_enumvalue" href="group__mqtt__enum__types.html#ggaba7ec045874a1c3432f99173367f735ca484e062cb4f3fccc1858dd25cfeee056">MQTTSuccess</a> )</div>
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<div class="line">{</div>
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<div class="line"> <span class="comment">// Since the QoS is > 0, we will need to call MQTT_ReceiveLoop()</span></div>
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<div class="line"> <span class="comment">// or MQTT_ProcessLoop() to process the publish acknowledgments.</span></div>
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<div class="line">}</div>
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<div class="ttc" id="acore__mqtt_8h_html_a00e1a3eba2c21899a6b4312c7d65d090"><div class="ttname"><a href="core__mqtt_8h.html#a00e1a3eba2c21899a6b4312c7d65d090">MQTT_GetPacketId</a></div><div class="ttdeci">uint16_t MQTT_GetPacketId(MQTTContext_t *pContext)</div><div class="ttdoc">Get a packet ID that is valid according to the MQTT 3.1.1 spec.</div><div class="ttdef"><b>Definition:</b> core_mqtt.c:3172</div></div>
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<div class="ttc" id="agroup__mqtt__enum__types_html_ggaba7ec045874a1c3432f99173367f735ca484e062cb4f3fccc1858dd25cfeee056"><div class="ttname"><a href="group__mqtt__enum__types.html#ggaba7ec045874a1c3432f99173367f735ca484e062cb4f3fccc1858dd25cfeee056">MQTTSuccess</a></div><div class="ttdeci">@ MQTTSuccess</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:88</div></div>
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<div class="ttc" id="agroup__mqtt__enum__types_html_ggae308a5928d7f537379c29a894228093aa019d0b8a8cfadb6f98462b046bdacbb2"><div class="ttname"><a href="group__mqtt__enum__types.html#ggae308a5928d7f537379c29a894228093aa019d0b8a8cfadb6f98462b046bdacbb2">MQTTQoS1</a></div><div class="ttdeci">@ MQTTQoS1</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:111</div></div>
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<div class="ttc" id="astruct_m_q_t_t_publish_info__t_html_a178224d02b4acdec7e08e88de0e4b399"><div class="ttname"><a href="struct_m_q_t_t_publish_info__t.html#a178224d02b4acdec7e08e88de0e4b399">MQTTPublishInfo_t::qos</a></div><div class="ttdeci">MQTTQoS_t qos</div><div class="ttdoc">Quality of Service for message.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:206</div></div>
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<div class="ttc" id="astruct_m_q_t_t_publish_info__t_html_a6161c792d20cc7cf8284c1b71ea1145f"><div class="ttname"><a href="struct_m_q_t_t_publish_info__t.html#a6161c792d20cc7cf8284c1b71ea1145f">MQTTPublishInfo_t::topicNameLength</a></div><div class="ttdeci">uint16_t topicNameLength</div><div class="ttdoc">Length of topic name.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:226</div></div>
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<div class="ttc" id="astruct_m_q_t_t_publish_info__t_html_a7997964e11571f35f0c3b729db0f760f"><div class="ttname"><a href="struct_m_q_t_t_publish_info__t.html#a7997964e11571f35f0c3b729db0f760f">MQTTPublishInfo_t::payloadLength</a></div><div class="ttdeci">size_t payloadLength</div><div class="ttdoc">Message payload length.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:236</div></div>
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<div class="ttc" id="astruct_m_q_t_t_publish_info__t_html_aa80e8ca282d01630f878ad0afe81d7a4"><div class="ttname"><a href="struct_m_q_t_t_publish_info__t.html#aa80e8ca282d01630f878ad0afe81d7a4">MQTTPublishInfo_t::pTopicName</a></div><div class="ttdeci">const char * pTopicName</div><div class="ttdoc">Topic name on which the message is published.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:221</div></div>
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<div class="ttc" id="astruct_m_q_t_t_publish_info__t_html_afc28299f4f625f5e674bb61b42f03380"><div class="ttname"><a href="struct_m_q_t_t_publish_info__t.html#afc28299f4f625f5e674bb61b42f03380">MQTTPublishInfo_t::pPayload</a></div><div class="ttdeci">const void * pPayload</div><div class="ttdoc">Message payload.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:231</div></div>
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