I just bought the Schwaiger ZHD 01 room temperature sensor / wall thermostat which is discovered and identified as 0002:8003:8001:0.0.
Manufacturer link: https://www.schwaiger.de/de/temperatursensor.html
It is a relabeled Danfoss Room Thermostat DRS21 V02 (0002:0003:8010) - even reads Danfoss on the device and below the Schwaiger sticker is the Danfoss one plus it comes with the Danfoss manual.
The device is sold as Devolo MT2649 (0003:8010) too.
Obviously it just reports with a different ID.
I did a search through the database, but did not succeed. The forum search did not give an hint.
Any chance you could add this to the DB ? I´m not familiar with this and do not want to break things (guess I anyhow would not have the edit rights).