This morning I got as reply from Boaz (Athom).
Some time ago he placed a sensor in the office, so he could check when the battery got beneath the threshold. But since the corona crisis, they are working from home and he is not able to check the sensor.
I guess we will have to wait for an update until they can return to the office.
Boaz proposed to make a flow to check if a specific device did not report a status for a day. But this is not applicable because if a door remains closed, no updates will be send at all, so the notification that no information was send for a day is misleading and is not an indication that the battery has depleted.
