Thanks. I'd post here community.hubitat.com/t/anybody-using-a-sensibo/ but it's been closed for some time unfortunately.
The suggestion got rid of the error but I'm still not getting communication from app to the device.
If I try turning on the aircon the logs for the device show :
dev:20792024-01-09 12:29:37.018 PMtraceDaikin Pod: refresh() ended
dev:20792024-01-09 12:29:37.015 PMdebugDaikin Pod: parsing Event data null
dev:20792024-01-09 12:29:37.012 PMdebugDaikin Pod: parsing data null
dev:20792024-01-09 12:29:33.035 PMtraceDaikin Pod: Executing 'poll' using parent SmartApp
dev:20792024-01-09 12:29:33.033 PMtraceDaikin Pod: refresh() called
dev:20792024-01-09 12:24:37.100 PMdebugDaikin Pod: parsing Event data null
dev:20792024-01-09 12:24:37.097 PMdebugDaikin Pod: parsing data null
dev:20792024-01-09 12:23:14.320 PMerrorjava.lang.NullPointerException: Cannot get property 'value' on null object on line 1126 (method on)
dev:20792024-01-09 12:22:59.024 PMerrorjava.lang.NullPointerException: Cannot get property 'value' on null object on line 1126 (method on)
dev:20792024-01-09 12:21:51.236 PMerrorjava.lang.NullPointerException: Cannot get property 'value' on null object on line 1126 (method on)
This must be related to one of the HE updates at some point breaking the app as it worked for others a couple of years ago. Hopfully @VeloWulf sees this at some point 
