MQTT strange logger warnings on OH shutdown

[AndrewFG (Andrew Fiddian-Green)]

@rossko57

it’s a fair bet that it does successfully subscribe (why should it not, even if no message ever comes) and the unsubscribing is probably messing up (let’s guess maybe everything is unsubscribed en-bloc before the discovery services get round to it).

@rossko57 having looked into the code, I think your hypothesis is correct; it looks as though there are three override classes (EspMilight, Homie, HomeAssistant) that extend from the “generic” class, so my guess is that the override classes are doing stuff themselves that the “generic” class is wrongly trying to clean up for them; so I have filed a new issue; but I have not yet had time to fix the code.

[mqtt] Erroneous Shutdown Warnings for EspMilight, HomeAssistant, Homie Discovery Services