"Connection Time Out" Error Handling

[anthonyrowe]

If I leave high-traffic (i.e. head motion test) programs running for a long time, I tend to see this failure state like below. I haven't looked more deeply, but maybe we can add a reconnect retry? I wonder if this is related to the ARTS issue?

`Exception thrown in update()! Terminating update...
Traceback (most recent call last):
File "headbanger.py", line 40, in update
scene.update_object( head, rotation=(0, i, 0),)
File "/home/agr/.local/lib/python3.6/site-packages/arena/scene.py", line 446, in update_object
res = self._publish(obj, "update")
File "/home/agr/.local/lib/python3.6/site-packages/arena/scene.py", line 504, in _publish
self.mqttc.publish(topic, payload, qos=0)
File "/home/agr/.local/lib/python3.6/site-packages/paho/mqtt/client.py", line 1274, in publish
local_mid, topic, local_payload, qos, retain, False, info, properties)
File "/home/agr/.local/lib/python3.6/site-packages/paho/mqtt/client.py", line 2563, in _send_publish
return self._packet_queue(PUBLISH, packet, mid, qos, info)
File "/home/agr/.local/lib/python3.6/site-packages/paho/mqtt/client.py", line 2911, in _packet_queue
self._sockpairW.send(sockpair_data)
TimeoutError: [Errno 110] Connection timed out

Exception thrown in network_latency_update()! Terminating network_latency_update...
Traceback (most recent call last):
File "/home/agr/.local/lib/python3.6/site-packages/arena/scene.py", line 161, in network_latency_update
self.mqttc.publish(self.latency_topic, "", qos=2)
File "/home/agr/.local/lib/python3.6/site-packages/paho/mqtt/client.py", line 1304, in publish
message.dup, message.info, message.properties)
File "/home/agr/.local/lib/python3.6/site-packages/paho/mqtt/client.py", line 2563, in _send_publish
return self._packet_queue(PUBLISH, packet, mid, qos, info)
File "/home/agr/.local/lib/python3.6/site-packages/paho/mqtt/client.py", line 2911, in _packet_queue
self._sockpairW.send(sockpair_data)
BrokenPipeError: [Errno 32] Broken pipe

Exception thrown in misc_loop()! Terminating misc_loop...
Traceback (most recent call last):
File "/home/agr/.local/lib/python3.6/site-packages/arena/event_loop/asyncio_mqtt.py", line 44, in misc_loop
while self.client.loop_misc() == mqtt.MQTT_ERR_SUCCESS:
File "/home/agr/.local/lib/python3.6/site-packages/paho/mqtt/client.py", line 1631, in loop_misc
self._message_retry_check()
File "/home/agr/.local/lib/python3.6/site-packages/paho/mqtt/client.py", line 2832, in _message_retry_check
self._out_messages, self._out_message_mutex)
File "/home/agr/.local/lib/python3.6/site-packages/paho/mqtt/client.py", line 2821, in _message_retry_check_actual
properties=m.properties,
File "/home/agr/.local/lib/python3.6/site-packages/paho/mqtt/client.py", line 2563, in _send_publish
return self._packet_queue(PUBLISH, packet, mid, qos, info)
File "/home/agr/.local/lib/python3.6/site-packages/paho/mqtt/client.py", line 2911, in _packet_queue
self._sockpairW.send(sockpair_data)
BrokenPipeError: [Errno 32] Broken pipe

Disconnect error! Result code: 1`