Recently i've bought myself some Fibaro Heat Controllers to control my radiators based on the temperature for each section in the house, all automated.
Sadly after buying my second one, I found out Fibaro rolled out firmware version 4.7 and this was not compatible with latest (2020.2) version of Domoticz.

The moment you try to add them, it shows up in Domoticz as a Unknown device and you can't control anything nor do values report back.
This is what happens when Domoticz isn't able to find a xml config file for your device. Either the device is:

1. Brand new product that's just been released
2. Firmware for the product has been changed in such a way the config files don't recognize it anymore

In my case it was the second one. Older firmware reported the ID of 1000, the 4.7 firmware reports 1001.