I have been working lately on integrating this thermostat into Home Assistant. Following the previous work by Benjamin Lafois for OpenHAB, I developed a python library to control the Bluetooth thermostat and, later, created this custom component.
This integration requires human intervention due to the pairing constraints on the device. Basically, you have to agree on the client and the thermostat by accepting the code. However, the thermostat is not visible for pairing if it is already paired with a mobile phone app. You can find more details on the requirements and installation in the python package repository or in the custom component repository itself.
By the way, the integration is lacking logo and icon (domain name is daikin_madoka, it could be symlinked to daikin). I have checked the “brands” repository, do I have to PR or is it only maintained by core developers?