old

https://hackaday.com/2020/12/08/exploring-custom-firmware-on-xiaomi-thermometers/

https://github.com/atc1441/ATC_MiThermometer

https://github.com/pvvx/ATC_MiThermometer

 Xiaomi Smart LCD Screen Digital Thermometer 2 Mijia Bluetooth Temperature Humidity Sensor Moisture Meter Mijia App

https://www.aliexpress.com/item/1005002401046796.html

LYWSD03MMC

decode using gatttool

https://ndimension.design.blog/2021/12/16/reading-data-from-xiaomi-mi-temperature-and-humidity-monitor-2-lywsd03mmc/

open source firmware

https://github.com/bentolor/xiaomi-mijia-bluetooth-firmware

simple shell to send reading to influx

https://github.com/dpavlin/air-quality/blob/master/ble-mijia.sh

https://github.com/dpavlin/air-quality/blob/master/system/ble-mijia%40.service

https://www.youtube.com/watch?v=NXKzFG61lNs

Home Assistant

get bindkey using https://atc1441.github.io/TelinkFlasher.html

https://esphome.io/components/sensor/xiaomi_ble.html?highlight=xiaomi_ble#obtaining-the-bindkey