Add the Humon Hex to the smo2 sensors. I know the Humon Hex is not sold anymore, but probably there are still many users out there owning one. Since the Moxy is already there, the Humon Hex might be easy to implement. Here are some hints at the bluetooth protocol: https://aquarat.co.za/2018/10/16/reverse-engineering-the-humon-hex-muscle-oxygenation-sensors-bluetooth-protocol/