Hey, I have recently managed to get a CB3S (BK7231N) Garage Door Sensor working with HA. Here I have described the process of setup and scripting, flashing guide and Yaml included:
https://www.elektroda.com/rtvforum/topic3936372.html
Sensor was flashed with cloudfree open source firmware - OpenBeken project (Tasmota-style multiplatform firmware), details on repository:
Also remember to take a look here - it’s a detailed list of known and supported devices by OBK (well, there also few WIP devices, but most of them are supported at the moment):
https://openbekeniot.github.io/webapp/devicesList.html
I hope that it helps somebody. More and more devices are no longer using ESP and are using those strange chinese chips, and most of them are already supported by OpenBeken (it’s a multiplatform firmware, for BK7231N, BK7231T, XR809, BL602, W601/600, W800/W801 and much more…)