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<div id="projectname">coreMQTT<span id="projectnumber"> v2.3.1</span>
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<div id="projectbrief">MQTT 3.1.1 Client Library</div>
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<a href="#define-members">Macros</a> |
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<div class="headertitle"><div class="title">core_mqtt_state.h File Reference</div></div>
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<p>Function to keep state of MQTT PUBLISH packet deliveries.
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<a href="#details">More...</a></p>
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<div class="textblock"><code>#include "<a class="el" href="core__mqtt_8h_source.html">core_mqtt.h</a>"</code><br />
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<p><a href="core__mqtt__state_8h_source.html">Go to the source code of this file.</a></p>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="define-members" name="define-members"></a>
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Macros</h2></td></tr>
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<tr class="memitem:ga666ad78e7eaaffa51f5cab96201a9476"><td class="memItemLeft" align="right" valign="top">
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#define </td><td class="memItemRight" valign="bottom"><b>MQTT_STATE_CURSOR_INITIALIZER</b>   ( ( size_t ) 0 )</td></tr>
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<tr class="memdesc:ga666ad78e7eaaffa51f5cab96201a9476"><td class="mdescLeft"> </td><td class="mdescRight">Initializer value for an <a class="el" href="group__mqtt__basic__types.html#ga2ca7d486d83fe555953a8c7876ee0d6e" title="Cursor for iterating through state records.">MQTTStateCursor_t</a>, indicating a search should start at the beginning of a state record array. <br /></td></tr>
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<tr class="memitem:ga2ca7d486d83fe555953a8c7876ee0d6e"><td class="memItemLeft" align="right" valign="top">
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typedef size_t </td><td class="memItemRight" valign="bottom"><b>MQTTStateCursor_t</b></td></tr>
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<tr class="memdesc:ga2ca7d486d83fe555953a8c7876ee0d6e"><td class="mdescLeft"> </td><td class="mdescRight">Cursor for iterating through state records. <br /></td></tr>
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<tr class="separator:ga2ca7d486d83fe555953a8c7876ee0d6e"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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Functions</h2></td></tr>
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<tr class="memitem:a44b3cf50dc477a9f97413a9238a961f6"><td class="memItemLeft" align="right" valign="top">uint16_t </td><td class="memItemRight" valign="bottom"><a class="el" href="core__mqtt__state_8h.html#a44b3cf50dc477a9f97413a9238a961f6">MQTT_PublishToResend</a> (const <a class="el" href="struct_m_q_t_t_context__t.html">MQTTContext_t</a> *pMqttContext, <a class="el" href="group__mqtt__basic__types.html#ga2ca7d486d83fe555953a8c7876ee0d6e">MQTTStateCursor_t</a> *pCursor)</td></tr>
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<tr class="memdesc:a44b3cf50dc477a9f97413a9238a961f6"><td class="mdescLeft"> </td><td class="mdescRight">Get the packet ID of next pending publish to be resent. <br /></td></tr>
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<tr class="separator:a44b3cf50dc477a9f97413a9238a961f6"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Function to keep state of MQTT PUBLISH packet deliveries. </p>
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</div><h2 class="groupheader">Function Documentation</h2>
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<a id="a44b3cf50dc477a9f97413a9238a961f6" name="a44b3cf50dc477a9f97413a9238a961f6"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a44b3cf50dc477a9f97413a9238a961f6">◆ </a></span>MQTT_PublishToResend()</h2>
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<td class="memname">uint16_t MQTT_PublishToResend </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="struct_m_q_t_t_context__t.html">MQTTContext_t</a> * </td>
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<td class="paramname"><em>pMqttContext</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="group__mqtt__basic__types.html#ga2ca7d486d83fe555953a8c7876ee0d6e">MQTTStateCursor_t</a> * </td>
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<td class="paramname"><em>pCursor</em> </td>
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<td></td>
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<td>)</td>
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</div><div class="memdoc">
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<p>Get the packet ID of next pending publish to be resent. </p>
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<p>This function will need to be called to get the packet for which a publish need to be sent when a session is reestablished. Calling this function repeatedly until packet id is 0 will give all the packets for which a publish need to be resent in the correct order.</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">pMqttContext</td><td>Initialized MQTT context. </td></tr>
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<tr><td class="paramdir">[in,out]</td><td class="paramname">pCursor</td><td>Index at which to start searching.</td></tr>
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</table>
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</dd>
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</dl>
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<p><b>Example</b> </p><div class="fragment"><div class="line"><span class="comment">// For this example assume this function returns an outgoing unacknowledged</span></div>
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<div class="line"><span class="comment">// QoS 1 or 2 publish from its packet identifier.</span></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> * getPublish( uint16_t packetID );</div>
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<div class="line"> </div>
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<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_typedef" href="group__mqtt__basic__types.html#ga2ca7d486d83fe555953a8c7876ee0d6e">MQTTStateCursor_t</a> cursor = <a class="code hl_define" href="group__mqtt__constants.html#ga666ad78e7eaaffa51f5cab96201a9476">MQTT_STATE_CURSOR_INITIALIZER</a>;</div>
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<div class="line"><span class="keywordtype">bool</span> sessionPresent;</div>
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<div class="line">uint16_t packetID;</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> * pResendPublish = NULL;</div>
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<div class="line"><a class="code hl_struct" href="struct_m_q_t_t_connect_info__t.html">MQTTConnectInfo_t</a> connectInfo = { 0 };</div>
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<div class="line"> </div>
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<div class="line"><span class="comment">// This is assumed to have been initialized before the call to MQTT_Connect().</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">// Set clean session to false to attempt session resumption.</span></div>
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<div class="line">connectInfo.<a class="code hl_variable" href="struct_m_q_t_t_connect_info__t.html#a606e7765c4f2215fb2bf630f6eb9ff6b">cleanSession</a> = <span class="keyword">false</span>;</div>
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<div class="line">connectInfo.<a class="code hl_variable" href="struct_m_q_t_t_connect_info__t.html#a010f8f6993cbf8899648d5c515ff7884">pClientIdentifier</a> = <span class="stringliteral">"someClientID"</span>;</div>
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<div class="line">connectInfo.<a class="code hl_variable" href="struct_m_q_t_t_connect_info__t.html#a8077ef36ab318f3d35bee6f098fa54d4">clientIdentifierLength</a> = strlen( connectInfo.<a class="code hl_variable" href="struct_m_q_t_t_connect_info__t.html#a010f8f6993cbf8899648d5c515ff7884">pClientIdentifier</a> );</div>
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<div class="line">connectInfo.<a class="code hl_variable" href="struct_m_q_t_t_connect_info__t.html#a7d05d53261732ebdfbb9ee665a347591">keepAliveSeconds</a> = 60;</div>
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<div class="line"><span class="comment">// Optional connect parameters are not relevant to this example.</span></div>
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<div class="line"> </div>
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<div class="line"><span class="comment">// Create an MQTT connection. Use 100 milliseconds as a timeout.</span></div>
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<div class="line">status = <a class="code hl_function" href="core__mqtt_8h.html#aed1e4dc123a8ba79ac569cb17c69bfa0">MQTT_Connect</a>( pContext, &connectInfo, NULL, 100, &sessionPresent );</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="keywordflow">if</span>( sessionPresent )</div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// Loop while packet ID is nonzero.</span></div>
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<div class="line"> <span class="keywordflow">while</span>( ( packetID = <a class="code hl_function" href="core__mqtt__state_8h.html#a44b3cf50dc477a9f97413a9238a961f6">MQTT_PublishToResend</a>( pContext, &cursor ) ) != 0 )</div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// Assume this function will succeed.</span></div>
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<div class="line"> pResendPublish = getPublish( packetID );</div>
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<div class="line"> <span class="comment">// Set DUP flag.</span></div>
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<div class="line"> pResendPublish-><a class="code hl_variable" href="struct_m_q_t_t_publish_info__t.html#aa1c8954e83bfa678d1ff5429679d4e89">dup</a> = <span class="keyword">true</span>;</div>
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<div class="line"> status = <a class="code hl_function" href="core__mqtt_8h.html#a1d8217e9d30fb2aed002060a8c97c63e">MQTT_Publish</a>( pContext, pResendPublish, 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">// Application can decide how to handle a failure.</span></div>
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<div class="line"> }</div>
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<div class="line"> }</div>
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<div class="line"> }</div>
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<div class="line"> <span class="keywordflow">else</span></div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// The broker did not resume a session, so we can clean up the</span></div>
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<div class="line"> <span class="comment">// list of outgoing publishes.</span></div>
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<div class="line"> }</div>
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<div class="line">}</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="acore__mqtt_8h_html_aed1e4dc123a8ba79ac569cb17c69bfa0"><div class="ttname"><a href="core__mqtt_8h.html#aed1e4dc123a8ba79ac569cb17c69bfa0">MQTT_Connect</a></div><div class="ttdeci">MQTTStatus_t MQTT_Connect(MQTTContext_t *pContext, const MQTTConnectInfo_t *pConnectInfo, const MQTTPublishInfo_t *pWillInfo, uint32_t timeoutMs, bool *pSessionPresent)</div><div class="ttdoc">Establish an MQTT session.</div><div class="ttdef"><b>Definition:</b> core_mqtt.c:2679</div></div>
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<div class="ttc" id="acore__mqtt__state_8h_html_a44b3cf50dc477a9f97413a9238a961f6"><div class="ttname"><a href="core__mqtt__state_8h.html#a44b3cf50dc477a9f97413a9238a961f6">MQTT_PublishToResend</a></div><div class="ttdeci">uint16_t MQTT_PublishToResend(const MQTTContext_t *pMqttContext, MQTTStateCursor_t *pCursor)</div><div class="ttdoc">Get the packet ID of next pending publish to be resent.</div><div class="ttdef"><b>Definition:</b> core_mqtt_state.c:1123</div></div>
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<div class="ttc" id="agroup__mqtt__basic__types_html_ga2ca7d486d83fe555953a8c7876ee0d6e"><div class="ttname"><a href="group__mqtt__basic__types.html#ga2ca7d486d83fe555953a8c7876ee0d6e">MQTTStateCursor_t</a></div><div class="ttdeci">size_t MQTTStateCursor_t</div><div class="ttdoc">Cursor for iterating through state records.</div><div class="ttdef"><b>Definition:</b> core_mqtt_state.h:51</div></div>
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<div class="ttc" id="agroup__mqtt__constants_html_ga666ad78e7eaaffa51f5cab96201a9476"><div class="ttname"><a href="group__mqtt__constants.html#ga666ad78e7eaaffa51f5cab96201a9476">MQTT_STATE_CURSOR_INITIALIZER</a></div><div class="ttdeci">#define MQTT_STATE_CURSOR_INITIALIZER</div><div class="ttdoc">Initializer value for an MQTTStateCursor_t, indicating a search should start at the beginning of a st...</div><div class="ttdef"><b>Definition:</b> core_mqtt_state.h:45</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="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="astruct_m_q_t_t_connect_info__t_html"><div class="ttname"><a href="struct_m_q_t_t_connect_info__t.html">MQTTConnectInfo_t</a></div><div class="ttdoc">MQTT CONNECT packet parameters.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:133</div></div>
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<div class="ttc" id="astruct_m_q_t_t_connect_info__t_html_a010f8f6993cbf8899648d5c515ff7884"><div class="ttname"><a href="struct_m_q_t_t_connect_info__t.html#a010f8f6993cbf8899648d5c515ff7884">MQTTConnectInfo_t::pClientIdentifier</a></div><div class="ttdeci">const char * pClientIdentifier</div><div class="ttdoc">MQTT client identifier. Must be unique per client.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:147</div></div>
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<div class="ttc" id="astruct_m_q_t_t_connect_info__t_html_a606e7765c4f2215fb2bf630f6eb9ff6b"><div class="ttname"><a href="struct_m_q_t_t_connect_info__t.html#a606e7765c4f2215fb2bf630f6eb9ff6b">MQTTConnectInfo_t::cleanSession</a></div><div class="ttdeci">bool cleanSession</div><div class="ttdoc">Whether to establish a new, clean session or resume a previous session.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:137</div></div>
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<div class="ttc" id="astruct_m_q_t_t_connect_info__t_html_a7d05d53261732ebdfbb9ee665a347591"><div class="ttname"><a href="struct_m_q_t_t_connect_info__t.html#a7d05d53261732ebdfbb9ee665a347591">MQTTConnectInfo_t::keepAliveSeconds</a></div><div class="ttdeci">uint16_t keepAliveSeconds</div><div class="ttdoc">MQTT keep alive period.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:142</div></div>
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<div class="ttc" id="astruct_m_q_t_t_connect_info__t_html_a8077ef36ab318f3d35bee6f098fa54d4"><div class="ttname"><a href="struct_m_q_t_t_connect_info__t.html#a8077ef36ab318f3d35bee6f098fa54d4">MQTTConnectInfo_t::clientIdentifierLength</a></div><div class="ttdeci">uint16_t clientIdentifierLength</div><div class="ttdoc">Length of the client identifier.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:152</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:173</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 class="ttc" id="astruct_m_q_t_t_publish_info__t_html_aa1c8954e83bfa678d1ff5429679d4e89"><div class="ttname"><a href="struct_m_q_t_t_publish_info__t.html#aa1c8954e83bfa678d1ff5429679d4e89">MQTTPublishInfo_t::dup</a></div><div class="ttdeci">bool dup</div><div class="ttdoc">Whether this is a duplicate publish message.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:216</div></div>
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