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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_GetSubscribePacketSize </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__serializer_8h.html#abb9a703cb23ab39fdd6fe282a5f3ddc5">MQTT_GetSubscribePacketSize</a>( <span class="keyword">const</span> <a class="code hl_struct" href="struct_m_q_t_t_subscribe_info__t.html">MQTTSubscribeInfo_t</a> * pSubscriptionList,</div>
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<div class="line"> <span class="keywordtype">size_t</span> subscriptionCount,</div>
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<div class="line"> <span class="keywordtype">size_t</span> * pRemainingLength,</div>
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<div class="line"> <span class="keywordtype">size_t</span> * pPacketSize );</div>
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<div class="ttc" id="acore__mqtt__serializer_8h_html_abb9a703cb23ab39fdd6fe282a5f3ddc5"><div class="ttname"><a href="core__mqtt__serializer_8h.html#abb9a703cb23ab39fdd6fe282a5f3ddc5">MQTT_GetSubscribePacketSize</a></div><div class="ttdeci">MQTTStatus_t MQTT_GetSubscribePacketSize(const MQTTSubscribeInfo_t *pSubscriptionList, size_t subscriptionCount, size_t *pRemainingLength, size_t *pPacketSize)</div><div class="ttdoc">Get packet size and Remaining Length of an MQTT SUBSCRIBE packet.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.c:1848</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_subscribe_info__t_html"><div class="ttname"><a href="struct_m_q_t_t_subscribe_info__t.html">MQTTSubscribeInfo_t</a></div><div class="ttdoc">MQTT SUBSCRIBE packet parameters.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:180</div></div>
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</div><!-- fragment --><p>Get packet size and Remaining Length of an MQTT SUBSCRIBE packet. </p>
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<p>This function must be called before <a class="el" href="core__mqtt__serializer_8h.html#a21273b13070e8340cc33b0f86bf79571" title="Serialize an MQTT SUBSCRIBE packet in the given buffer.">MQTT_SerializeSubscribe</a> in order to get the size of the MQTT SUBSCRIBE packet that is generated from the list of <a class="el" href="struct_m_q_t_t_subscribe_info__t.html" title="MQTT SUBSCRIBE packet parameters.">MQTTSubscribeInfo_t</a>. The size of the <a class="el" href="struct_m_q_t_t_fixed_buffer__t.html" title="Buffer passed to MQTT library.">MQTTFixedBuffer_t</a> supplied to <a class="el" href="core__mqtt__serializer_8h.html#a21273b13070e8340cc33b0f86bf79571" title="Serialize an MQTT SUBSCRIBE packet in the given buffer.">MQTT_SerializeSubscribe</a> must be at least <code>pPacketSize</code>. The provided <code>pSubscriptionList</code> is valid for serialization with <a class="el" href="core__mqtt__serializer_8h.html#a21273b13070e8340cc33b0f86bf79571" title="Serialize an MQTT SUBSCRIBE packet in the given buffer.">MQTT_SerializeSubscribe</a> only if this function returns <a class="el" href="group__mqtt__enum__types.html#ggaba7ec045874a1c3432f99173367f735ca484e062cb4f3fccc1858dd25cfeee056">MQTTSuccess</a>. The remaining length returned in <code>pRemainingLength</code> and the packet size returned in <code>pPacketSize</code> are valid only if this function returns <a class="el" href="group__mqtt__enum__types.html#ggaba7ec045874a1c3432f99173367f735ca484e062cb4f3fccc1858dd25cfeee056">MQTTSuccess</a>.</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">pSubscriptionList</td><td>List of MQTT subscription info. </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">subscriptionCount</td><td>The number of elements in pSubscriptionList. </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">pRemainingLength</td><td>The Remaining Length of the MQTT SUBSCRIBE packet. </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">pPacketSize</td><td>The total size of the MQTT SUBSCRIBE packet.</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#ggaba7ec045874a1c3432f99173367f735caa39030c93b0263b2699502a074f003b5">MQTTBadParameter</a> if the packet would exceed the size allowed by the MQTT spec; <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_subscribe_info__t.html">MQTTSubscribeInfo_t</a> subscriptionList[ NUMBER_OF_SUBSCRIPTIONS ] = { 0 };</div>
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<div class="line"><span class="keywordtype">size_t</span> remainingLength = 0, packetSize = 0;</div>
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<div class="line"><span class="comment">// This is assumed to be a list of filters we want to subscribe to.</span></div>
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<div class="line"><span class="keyword">const</span> <span class="keywordtype">char</span> * filters[ NUMBER_OF_SUBSCRIPTIONS ];</div>
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<div class="line"> </div>
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<div class="line"><span class="comment">// Set each subscription.</span></div>
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<div class="line"><span class="keywordflow">for</span>( <span class="keywordtype">int</span> i = 0; i < NUMBER_OF_SUBSCRIPTIONS; i++ )</div>
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<div class="line">{</div>
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<div class="line"> subscriptionList[ i ].<a class="code hl_variable" href="struct_m_q_t_t_subscribe_info__t.html#a64cf2e423f60cfec122eeaef80c0fd86">qos</a> = <a class="code hl_enumvalue" href="group__mqtt__enum__types.html#ggae308a5928d7f537379c29a894228093aaad51b23a1ae1417f96d8f343c788d1d2">MQTTQoS0</a>;</div>
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<div class="line"> <span class="comment">// Each subscription needs a topic filter.</span></div>
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<div class="line"> subscriptionList[ i ].<a class="code hl_variable" href="struct_m_q_t_t_subscribe_info__t.html#adb0b28240fdcd82a85f11cf2f8b5bbf0">pTopicFilter</a> = filters[ i ];</div>
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<div class="line"> subscriptionList[ i ].<a class="code hl_variable" href="struct_m_q_t_t_subscribe_info__t.html#a6972f8e036f8bde9b1f23a2aacb61382">topicFilterLength</a> = strlen( filters[ i ] );</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="comment">// Get the size requirement for the subscribe packet.</span></div>
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<div class="line">status = <a class="code hl_function" href="core__mqtt__serializer_8h.html#abb9a703cb23ab39fdd6fe282a5f3ddc5">MQTT_GetSubscribePacketSize</a>(</div>
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<div class="line"> &subscriptionList[ 0 ], NUMBER_OF_SUBSCRIPTIONS, &remainingLength, &packetSize</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">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">// The application should allocate or use a static #MQTTFixedBuffer_t</span></div>
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<div class="line"> <span class="comment">// of size >= packetSize to serialize the subscribe request.</span></div>
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<div class="line">}</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_ggae308a5928d7f537379c29a894228093aaad51b23a1ae1417f96d8f343c788d1d2"><div class="ttname"><a href="group__mqtt__enum__types.html#ggae308a5928d7f537379c29a894228093aaad51b23a1ae1417f96d8f343c788d1d2">MQTTQoS0</a></div><div class="ttdeci">@ MQTTQoS0</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:110</div></div>
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<div class="ttc" id="astruct_m_q_t_t_subscribe_info__t_html_a64cf2e423f60cfec122eeaef80c0fd86"><div class="ttname"><a href="struct_m_q_t_t_subscribe_info__t.html#a64cf2e423f60cfec122eeaef80c0fd86">MQTTSubscribeInfo_t::qos</a></div><div class="ttdeci">MQTTQoS_t qos</div><div class="ttdoc">Quality of Service for subscription.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:184</div></div>
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<div class="ttc" id="astruct_m_q_t_t_subscribe_info__t_html_a6972f8e036f8bde9b1f23a2aacb61382"><div class="ttname"><a href="struct_m_q_t_t_subscribe_info__t.html#a6972f8e036f8bde9b1f23a2aacb61382">MQTTSubscribeInfo_t::topicFilterLength</a></div><div class="ttdeci">uint16_t topicFilterLength</div><div class="ttdoc">Length of subscription topic filter.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:194</div></div>
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<div class="ttc" id="astruct_m_q_t_t_subscribe_info__t_html_adb0b28240fdcd82a85f11cf2f8b5bbf0"><div class="ttname"><a href="struct_m_q_t_t_subscribe_info__t.html#adb0b28240fdcd82a85f11cf2f8b5bbf0">MQTTSubscribeInfo_t::pTopicFilter</a></div><div class="ttdeci">const char * pTopicFilter</div><div class="ttdoc">Topic filter to subscribe to.</div><div class="ttdef"><b>Definition:</b> core_mqtt_serializer.h:189</div></div>
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