In the UI there is a field “Last Seen” for Zigbee devices.
Imagine a water leakage or smoke detection sensor: they only rarely (or hopefully never) send state change events, but for the user it is crucial to know if they are still alive and working.
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It would be cool if there would be a convenient way to set up alerting if this “Last Seen” value is too old.
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Also nice would be an easy way to setup an automation like sending a status message “all sensors alive” once a week.