How pair Bitron Home sensors with Sonoff/Z4D/Domoticz?

[Jurjen]

I'd like to get Domoticz to work with a couple of Bitron Home sensors I've installed in my house. I have BitronHome 902010/122 IR Movement Sensors, 902010/121A Magnetic Contacts and 902010/124 Optical Smoke Detectors.

I've just installed Z4D and a Sonoff 3 Zigbee USB dongle on my Pi 3+ with Domoticz. As far as I can see in the logs, Z4D is connected to the Sonoff. However, I don't have a clue how to pair the Bitron sensors and Z4D/Sonoff.

Any help will be much appreciated!