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<div class="textblock"><p>The client application runs on several threads. Processing of handshaking and maintaining the network connection is performed in the background. This API is thread safe: functions may be called by multiple application threads. Notifications of status and message reception are provided to the client application using callbacks registered with the library by the call to <a class="el" href="_m_q_t_t_async_8h.html#ae9ae8d61023e7029ef5a19f5219c3599">MQTTAsync_setCallbacks()</a> (see <a class="el" href="_m_q_t_t_async_8h.html#a3918ead59b56816a8d7544def184e48e">MQTTAsync_messageArrived()</a>, <a class="el" href="_m_q_t_t_async_8h.html#a3900a98d7b1d58ad6e686bfce298bb6c">MQTTAsync_connectionLost()</a> and <a class="el" href="_m_q_t_t_async_8h.html#ab10296618e266b3c02fd117d6616b15d">MQTTAsync_deliveryComplete()</a>). In addition, some functions allow success and failure callbacks to be set for individual requests, in the <a class="el" href="struct_m_q_t_t_async__response_options.html">MQTTAsync_responseOptions</a> structure. Applications can be written as a chain of callback functions. </p>
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