home assistant RC 2022.6 mqtt config update for configuration.yaml

[admin]

1. you need download KCS firmware to A16 board. then you can login webpage see the UID , that called "serial number" on webpage.
how to use KCS firmware, here is online guide: https://www.kincony.com/esp32-kcsv2-firmware.html
2. enable "MQTT" protocol
3. here is mqtt integration demo for A8S board, but you can also use for A16, just only change some PCF8574 pin define and i2c address.
https://www.kincony.com/forum/showthread.php?tid=3274