ion messages are received from the broker.</td></tr>
  </table>
  </dd>
</dl>
<dl class="section post"><dt>Postcondition</dt><dd>mqtt_connect must be called.</dd></dl>
<dl class="section note"><dt>Note</dt><dd><code>sockfd</code> is a non-blocking TCP connection. </dd>
<dd>
If <code>sendbuf</code> fills up completely during runtime a <code>MQTT_ERROR_SEND_BUFFER_IS_FULL</code> error will be set. Similarly if <code>recvbuf</code> is ever to small to receive a message from the broker an MQTT_ERROR_RECV_BUFFER