Maybe it’s possible to connect a temperature sensor to the Arduino and push this value to the heater system at regular times?
For what I know this is not possible. But the development at the board goes fast as well. My plan is to support a temperature push. This will be a bit challenging in the configflow. This is for a later release.
You could use home assistant maybe to push a temperature. You can ask tiger42 how he hass setup his setup
At the moment I am working on to support most parameters for heating circuit1 and circuit2 if the parameters are not present for the user system it will skip them. This will also work for the temperature that is not present in your setup.
This way your thermostat in homeassistant will use for example the max and min temp of your heating system and the switching temp when it needs to start cooling etc. And there are a lot more paramerters. It will also read the heater current action.
But it’s a lot of rewrite to get it nice and efficient.