This repo consists of my first attempt to let homie-esp8266 from Marvin Roger run on Beta Test Board Black Board T5 ESP-13.
You can order these boards on Amazon.
Darryl Bond has collected some useful information on the inner workings of the board and the STC15L2K32S microcontroller.
This is how the board looked unmodified:
And here I removed the disturbing beeper and connected RX/TX to my USB-TTL connector so I could eavesdrop the communication between both chips: