occasional error with MQTT_CLIENT.check_msg() as shown in example. Give OSError(-80,)

[davis-c]

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What are the steps to reproduce this issue?

1. using method show in this example
2. https://raw.githubusercontent.com/pycom/pycom-libraries/master/GoogleIOT/flash/main.py
3. the call to MQTT_CLIENT.check_msg()

What happens?

will sometimes hang. It displays this message

mqtt: OSError(-80,)
[MQTT] mqtt.googleapis.com OK!

What were you expecting to happen?

Either fail gracefully or raise an exception.

Any logs, error output, etc?

(If it’s long, please paste to https://gist.github.com and insert the link here)

Any other comments?

What versions of software are you using?

• fipy and not sure about version of hardware. its a recent purchase and firmware has been updated:
• os.uname() output: (sysname='FiPy', nodename='FiPy', release='1.20.2.rc6', version='v1.20.1.r2-114-ge264b4c24-dirty on 2020-04-20', machine='FiPy with ESP32', lorawan='1.0.2', sigfox='1.0.1')