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Error handling when no PINGRESP received [message #1721105]

Sat, 23 January 2016 21:37

Will Luke

Messages: 2
Registered: January 2016

Junior Member

Hi,

I'm new to MQTT and loving it so far. But I'm trying to find out how to handle timeouts, particularly when a PINGRESP hasn't been received by a client.

I'm checking for a valid internet connection when the initial connection fails and essentially waiting until it becomes alive again. But if the remote broker fails or becomes unresponsive, how can I restart the connection from the beginning? Currently, the forever loop just waits to receive the PINGRESP (and waits forever)

I'm tinkering in Python at the mo. Thoughts welcome

Will

while True:
	try:
		mqttc.connect('cloudmqtt.com','16474')
# We should probably log this successful connection via mtqq in g, in a text file
# 		mqttc.publish("g/lamp", "ON")
		rc = 0
		while rc == 0:
			rc = mqttc.loop_forever(60,60,retry_first_connection=True)
		print("rc: " + str(rc))
	except socket.error:
#   Can't reach the server. We should check to see if the internet can be reached at all with a variety of pings
#   Also, colour the light red to indicate connection trouble		
		print "Connection trouble. Let's check to see if we can ping anything"
		
		if have_internet() is True:
			print "Internet connection is working. We'll sleep for 10 secs"
			time.sleep(10)

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