Need at least the camera, if not that plus a microphone and speakers, not the lock or bell.
Libre Software (Obviously) + End-to-End Encryption
Small and easy to hide, so the camera isn’t stolen, attacked or bypassed.
No specific measurements.
https://www.wyze.com/products/wyze-cam-pan
Something like this which has a privacy mode where it rotates and hides could be good.
Vandal proof camera is easy to find, but with privacy mode? I don’t think such product exist yet.
That’s not vandal proof. What I mean by vandal proof is IK rated, like IK10.
Best I can find is https://www.hikvision.com/en/products/IP-Products/PTZ-Cameras/Value-Series/ds-2de2a404iw-de3-w-s6-/
You will have to set the camera pointing default to a non sensitive area, likely ground if you mount it directly above your doorbell, and only tilt up when it get some event triggers like motion (feet), audio (it does have a mic), doorbell (via home assistant), other cameras (mition alerts), or something else.
