Make use of ac_timeout parameter

hbmqtt/mqtt/protocol/handler.py

@@ -162,6 +162,17 @@ class ProtocolHandler:
 
     @asyncio.coroutine
     def mqtt_publish(self, topic, data, qos, retain, ack_timeout=None):
+        """
+        Sends a MQTT publish message and manages messages flows.
+        This methods doesn't return until the message has been acknowledged by receiver or timeout occur
+        :param topic: MQTT topic to publish
+        :param data:  data to send on topic
+        :param qos: quality of service to use for message flow. Can be QOS_0, QOS_1 or QOS_2
+        :param retain: retain message flag
+        :param ack_timeout: acknowledge timeout. If set, this method will return a TimeOut error if the acknowledgment
+        is not completed before ack_timeout second
+        :return: ApplicationMessage used during inflight operations
+        """
         if qos in (QOS_1, QOS_2):
             packet_id = self.session.next_packet_id
             if packet_id in self.session.inflight_out:
@@ -171,7 +182,11 @@ class ProtocolHandler:
 
         message = OutgoingApplicationMessage(packet_id, topic, qos, data, retain)
         # Handle message flow
-        yield from asyncio.wait_for(self._handle_message_flow(message), 60, loop=self._loop)
+        if ack_timeout is not None and ack_timeout > 0:
+            yield from asyncio.wait_for(self._handle_message_flow(message), ack_timeout, loop=self._loop)
+        else:
+            yield from self._handle_message_flow(message)
+
         return message
 
     @asyncio.coroutine