The minValue data is working because it updates the value in HomeKit when no TempValue is available. So general Setup is working, but I want the device to appear in the correct room/name.
it is not possible to set room name from openHAB. this is not limitation of openHAB but of Apple HomeKit standard. room assignment can be only done manually.
one tip: put room name as first in the item name. once the room is assigned in home app, it will remove it from item name.
e.g.
item name in openHAB: “kitchen light”.
once you assign it to the room “kitchen” it will appear in the home app as “light”.
regarding battery:
create an item for battery, e.g. switch that indicates low battery
add item to the group with device it belongs to, e.g. “Temperature Diele”.