I have to admit I'm quite annoyed. I just realised that I had lost connection to 2 of my contact sensors about a month ago and had no idea. So, when I ran the rule to check security (windows closed, etc.), it reported back as everything good. Meanwhile the sensor wasn't responding and happened to lose connection in the 'closed' state, so rule machine kept thinking all was closed.
Is there a rule that can determine the health of devices (e.g. Hasn't checked in for x minutes) or something like that?
Any help would be appreciated.
P.s. Got a similar question under support around this