My computer can read info and send info to both the wall thermostat (Nest Gen3) and the TRV heads (Energenie MiHome) but they don't talk to each other.
I want if the current temperature is below target temperature on any of the 4 TRV head I want the wall thermostat to tell the boiler to run.
i.e. If this then that.
I know the Energenie are IFTTT enabled, not sure about Nest Gen 3, using simple off/on not Opentherm as an oil boiler.