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<p>Function that does the actual sending and receiving of traffic from the network.All the other functions in the <a class="el" href="group__api.html">API</a> simply stage messages for being sent to the broker. This function does the actual sending of those messages. Additionally this function receives traffic (responses and acknowledgements) from the broker and responds to that traffic accordingly. Lastly this function also calls the <code>publish_response_callback</code> when