Someone's working on an open source implementation of the low level wifi firmware for the ESP32, info here. Would be cool if they do actually manage to reverse engineer something usable.
I'm an electronic security technician. My system is a mishmash of Axis, Hikvision, Bosch, UNV, and Arecont. Basically whatever customers throw away when they upgrade. As long as it can do ONVIF, I'm good.
Anybody need some commercial access control panels? I got a stack of those in the basement too...