Hello,
I you are interested in the full integration with Brink Renovent HR, please have a look here:

https://github.com/raf1000/brink_openhab/blob/main/README.md

The integration is with openhab but similar one can be done with home assistant I suppose (mqtt)
It is tested with Brink Renovent HR, but Brink Renovent Excellent has the opentherm protocol available as well...