Oh very cool @chimeranzl
I used your web page up as a reference when I was trying to both display and control my HRV using EspHome. I got the display going thanks in part to your example, but could never get the control going.
Ultimately I found it easier to engineer a new solution from scratch than reverse engineer the existing HRV system.
Here is what I came up with: https://community.home-assistant.io/t/hrv-erv-controller/567127
It has worked flawlessly for about a year now.
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