Esp32-S2 based circuit that goes in between the intercomm itself and the screw terminals.
For starters it should receive the call signal from the lobby and open the door, but since that would be a complete security risk, i will implement a code to open the door, akin to morse code (short or long presses divided by pauses) - something like click click hold and it opens the door.
In the near future i'm considering sending audio to the entrace - simulating the intercomm's microphone - after a successful code input.
In the not so near future i will make a web app to open the door - the "difficulty" is in making the esp-32 accessible to the internet and not just locally.
In the non-existing future i will tackle the video lines and send the stream to said web app, but that seems like a whole project itself.