Hi,
I have searched a lot in this forum and at github issues, but nothing really fits to my problem. I want to create an aggregated group item which indicates if at least one of my sensors is running out of energy. So I setup a group and an item like this:
Group gLOW_BATTERY
Group:Switch:AND(OFF, ON) LOW_BATTERY_INDICATOR (gLOW_BATTERY)
at another item file:
Switch THERMOSTAT_LOWBAT (gOTHERGROUP, gLOW_BATTERY) {channel="homematic:HM-CC-RT-DN:92859b7c:NEQ0878543:0#LOWBAT"}
Log output is:
2016-09-03 15:41:54.390 [ItemStateChangedEvent ] -THERMOSTAT_LOWBAT changed from NULL to OFF
2016-09-03 15:41:54.415 [GroupItemStateChangedEvent] - gLOW_BATTERY changed from NULL to UNDEF through THERMOSTAT_LOWBAT
Why is gLOW_BATTERY changed to UNDEF and why is LOW_BATTERY_INDICATOR also UNDEF?
Thanks!
UPDATE: I totally misunderstood the docs. The proper way is:
Group:Switch:AND(OFF, ON) gLOW_BATTERY