Add support for Aranet4 Home CO2, relative humidity and temperature sensor over BLE

[kasparsd]

Describe the problem you have/What new integration you would like

I would like to add Aranet4 Home support. It reports the current sensor readings and historic values over BLE.

Please describe your use case for this integration and alternatives you've tried:

There are several integrations with other platforms that can be used for reference:

• https://github.com/SAF-Tehnika-Developer/com.aranet4
• https://github.com/Anrijs/Aranet4-Python

Additional context

[nagyrobi]

See https://esphome.io/components/sensor/xiaomi_ble.html

[bjeanes]

The Xiaomi BLE doesn't support Aranet nor any device which publishes CO2.

I also would like to see support for the Aranet4.

There seems to be some prior art on this for the ESP32: https://github.com/Anrijs/Aranet4-ESP32

[stefanthoss]

ESPHome already supports CO2/temperature/humidity, you just have to configure sensors using the correct BLE characteristic UUIDs. I wrote an ESPHome package to do this for the Aranet4: https://github.com/stefanthoss/esphome-aranet4