A hack suggestion for someone who wants to build something that is more an upgrade than a replacement and address this better -- specially for panels which have

A hack suggestion for someone who wants to build something that is more an upgrade than a replacement and address this better -- specially for panels which have individual buttons for each apartment: - build a camera only panel that can be added on the wall - camera has a built-in power supply that uses the doorbells panel power - camera has built-in PLN module that uses modulations on the doorbells panel ground - in your apartment, you setup a box that connects to your entry phone and grab the video feed from the ground PLN, grabs the triggering from the entry phone line, the box connects to your Wi-Fi network - the rest is software