I think this is not my case:
> SELECT value FROM HeatingState
name: HeatingState
time value
---- -----
1609203600909000000 OFF
1609205662426000000 ON
1609206336431000000 OFF
1609207200911000000 OFF
1609209231059000000 ON
1609209935331000000 OFF
Maybe the How to integrate with another OH Instance needed some tweaks? 