- Doorbell button does not get sent as an event. You can use Zwave reed door sensors mounted near a magnetic bell, or a simple relay instead of bell unit can be used to short a door sensor out and inform openHAB. Another solution to detect the button press is found here:
https://ipcamtalk.com/threads/new-rca-hsdb2a-3mp-doorbell-ip-camera.31601/page-296#post-502958