I also own a Netatmo doorbell and would like to integrate this into HA. I contacted Netatmo for getting the dev docs online for the doorbell. I did send it a few minutes ago so no response yet 
@tvds I just tried that. You can pair the doorbell within the HA HomeKit Controller integration. Then you only get one sensor: binary_sensor.netatmo_doorbell (I didn’t test whether this is motion or keypress or on/off or …). The doorbell can only be paired once so I don’t have the video stream anymore in my local Apple Home app. Also my Netatmo Security app wasn’t recognizing the doorbell anymore and was stuck in configuration dialogs. So this is not what you or anybody else want I guess because you’re left with near-zero functionality.
@cgtobi I’m not sure what you mean by ‘running the self test script’. If there is any script I can run against my doorbell I’m more then happy to do that. So maybe you can share that details here?