> Every controlled door is wired to a relay panel. That panel connects to a access control db Absolutely not. E.g. HID is a well-documented protocol and you ca

> Every controlled door is wired to a relay panel. That panel connects to a access control db Absolutely not. E.g. HID is a well-documented protocol and you can do whatever you want using the RS232 interface they come with (depending on the model). I personally wrote a gateway that would dynamically and directly check the access with my own software.