As far as I know it is not possible with Domoticz to wait for a wake-up and then initiate a poll. So I poll these nodes anyway.
It would be great if this could be implemented!

You can also consider a conversion from battery power to DC-power, so you can at least set the wake-up interval to the ...

I am experiencing the same lack of support for StellaZ. I can change the curent setpoint but I am unable to switch to any of the other setpoints by utilizing Thermostat_mode. Also, direct valve control is not accesible.
The thread that Gizmocuz references involves adding a manufacturer specific ...

Both work well, but direct position control is more accurate and you can use alternative temperature feedback.

I am curious how you switched your StellaZ to direct valve control.
Even though thermostat_mode should be supported by Domoticz, the StellaZ do not show a thermostat_mode device in the ...