Ok, that helps!
So normally, my set points values would be queued in the controller, and then on wake up transfered to the device. That would mean that I should find my value stored in the device latest after 5min.
But in my case, I assume that the device wakes up: It sends its old set value and overwrites my value in OH. That again is strange, but at least two threads describe a similar behavior (see [SOLVED] Devolo MT 2650 ignores setpoint value sent via Z-Wave, also with logs)
Or is it simply a wrong item definition on my side?
I use
Number:Temperature Set_Point_Heating_Office "Heizung Büro" <temperature> (Office) { channel="zwave:device:5fe6dd01:node7:thermostat_setpoint_heating" }
and write my set point value to that item. But after some minutes, the item value returns to its original value and the thermostat still has its old setting.
Is this the right way? Or is the behaviour normal and my item (or my expectation how the item works) are wrong?