@Solla-topee I'm currently trying different sensitivity adjustments to see whether they bring some improvements. Please wait, thanks.

@Solla-topee The detection algorithm on the camera seems to ignore postmen who come on bike... depending on the trajectory they make through the alley to get to my postbox.

@sequeira

@MarioInJapan But, you already answered that with the T110 sensor my need cannot be satisfied. I would need something alse like this (from IKEA):

@Wayne-TP Please see this picture. Surfaces A and B, where the two parts of the door sensors should be affixed, are at right angle (part A belongs to the door frame, and part B to the door):

Our doors and windows are not flush with the containing frames, therefore there is no way to install them with their sensing part side by side as currently shown in all adverts and specs. But, would...