Recently I found this smoke detector haven’t report battery status ( should every 2 days ) and Apps “device health” show a red dot. After check the event log, I found many online / offline / ping.
I suspect it should be weak signal issue ( not far away ~10m and not in direct eyesign). Finally I relocate the Hub for a try and still under monitoring, I will report the result.
Suggest everyone should perform a check, there are no clear notification, I think it work well and protect me but in fact not.