API RESTful Documentation?

At any standardized level, no -- in no small part due to the fact that for many kinds of devices, this is impossible to know (e.g., battery powered Z-Wave devices are normally sleeping and not listening for commands from the hub). Some LAN devices offer a networkStatus attribute (as many such devices have a better way to know; not all), and there is an informal effort among some community drivers to offer a healthStatus attribute for their drivers if it makes sense (and perhaps sometimes even when it doesn't :smiley: ).

This is one of the reasons I wrote this app, since there isn't a good way to know for many devices except whether they've had "activity" recently: [RELEASE] Device Activity Check - Get notifications for "inactive" devices. But that won't help you with this particular question.

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