Automatically send homeassistant mqtt autodiscovery packet on reconnect.

[xoseperez]

Originally reported by: Vishal Chaudhary (Bitbucket: vishix, GitHub: vishix)

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I am requesting this feature because it will save a lot of time for anyone integrating a lot of sonoff devices like me (24 sonoff devices). What the feature should do is, on any reconnect just send the mqtt config packet again, it will not have any side effect on HA integration as HA neglects already discovered devices. But will save a lot of time if I am clearing the HA db or mqtt db for any reason, then adding 24 devices again is too much pain. I hope I am able to explain the importance of this feature.

Thanks.

[xoseperez]

In the dev branch, will be released with next version.

[xoseperez]

Released with 1.10.0

[xoseperez]

Removing milestone: 1.9.10 (automated comment)