Are others monitoring the availability / online status of their sensors? I’d like to be alerted when any of my zwave or zigbee sensors stop reporting so that I can investigate and fix ASAP. I imagine some automation that checks a list of sensors at some interval for a timestamp of the last known report and alerts if it’s longer than, say, 12 hours (bonus: configurable by device). By “report” I mean some heartbeat signal, NOT the last open/close/motion event. I have some sensors that may not be triggered for months, but I still need to know that they are online and reporting.
Currently using zwave2qtt and the Home Assistant MQTT integration which works great, but I’m not seeing any “last report” info. I know z-wave devices have some concept of a heartbeat signal (i.e. wake from sleep). Any idea how I can obtain that? Same for zigbee. I have a bunch of Aqara sensors that I’ll probably pair w/ conbee/deConz. Any idea how I can obtain device report data via that?
I’m attempting to build a highly secure and reliable security system and I see this as a requirement. I’d be interested to hear any other thoughts you might have about building a security system using Home Assistant. I know lots of people will say “don’t do that. integrate a 3rd party alarm system instead”. I’m not opposed to that and may well do that, but right now I’m giving this custom solution a shot. So, please only constructive replies/ 
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