For those looking to get data out of your wave plus, I was able to get this working on mine… https://github.com/gkreitz/homeassistant-airthings.
I am running hassio on a RPI 4. Getting the MAC address from the wave plus was my biggest issue. I could not get the find_wave.py script to run from my RPI4.
To get the MAC address from the wave plus: On my Android Pixel that is paired with my Airthings Wave Plus, I installed Bluetooth Scanner (https://play.google.com/store/apps/details?id=com.pzolee.bluetoothscanner). Under Devices on the first tab, I clicked Start at the bottom of the app. The app searched for Bluetooth devices and one of the devices found was Type Unknown with a MAC that started with C4:64… When I selected “more” for that device, The BLE GATT characteristics showed: Manufacturer Name Airthings AS with the last 6 digits of my Serial number found under the plate on the bottom of my wave plus.
Using this MAC and the instructions from gkreitz (https://github.com/gkreitz/homeassistant-airthings) I am able to see sensor.airthings_short_term_radon and the other sensors in hassio!