Add a parameter to know if firmware update is supported

[nicola-lunghi]

Parameter to know if firmware upgrade over the air is supported

homie/super-car/$fw/upgrade-supported → "true"

[fermuch]

Since each component updates it's own way, doesn't it make more sense to add it as an $implementation, as the esp8266 library does?

[ThomDietrich]

@fermuch raises a valid point. OTA is not part of the convention to begin with. The more general question here is hence: Should it be? I'd be inclined to say no as this functionality is not relevant for interoperability.

[timpur]

I would have to agree with the above answers, homie has a core purpose and cant be streched out to fit every snario, It is not for homie to say if you must suport OTA. For some implementations this doesnt make sense at all. This is why it is located in $implementation.