For those who found the same issue...I got it!
A simple click on the smoke detector tests the communication between the detector and the gateway (receiving a Chinese voice from the gateway)
A long click, wil simulate a smoke alarm (the test I was looking for). This test is communicated to Domoticz ...

I have the same issue as described intially by hoeby.
I attached my gateway to Domoticz succesfully. Also added a door sensor and two smoke detectors.
Door sensor is updating the status (open/closed) and interactions are seen in the log file of domoticz

The smoke detectors also appear in the ...