But I get false-negative alarms. In grafana I set 15 min period, but I still get some false-neagtive (i’m at home, but openhab doesent see my phone - switch is OFF).
I have installed arping on the server, what I should do to get 100% working with 15 min accuracy time period?
Make sure arping is actually working from the command line. Amend timeout and retry values until you no longer get false negatives. Although the thread linked by @vzorglub is entitled iPhones, the principals apply to Android devices too.