Resubscribe to command topics when MQTT server restarts while service is active

[karl500]

Checklist:

• [ yes] I updated to the latest version available
• [ yes] I checked that my MQTT broker is otherwise working

Release with the issue: 1.8.4

Last working release (if known):

Hardware, Operating System, Python version: Rpi 3b r1.2, buster 5.4.51-v7+, python 3.7.3

Description of problem: When MQTT server restarts while the service is active. MQTT is reconnected but command topics are not subscribed to again. Subscribing to topics probably should be moved to the callback on_connect.

As this is a bug in code don't realy see the need for other info.

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Additional information:

[ironsheep]

@karl500 thank you for reporting this. I'm working on the fix now...

[ironsheep]

Changes committed and will appear in v1.8.5 and later.