I already managed to connect to Danfoss devices and add them into Homey now!
Thanks to [App][Pro] Danfoss Ally
- Add the Danfoss Ally API to my Danfoss account on Danfoss developer page
- Add API key + secret to Danfoss Ally app in Homey
- Test connection, Danfoss devices should be discovered
- Add devices to Homey, and start playing!