Basis Watch is a heart rate monitor and steps counter and few other things. They have an app which communicate to the watch via Bluetooth and then sends the data to the server and the server sends compiled data to the app.
I'm looking to make a simple API based on their proprietary app which would allow me to get information like heart rate and the rest of the sensors.
You would need to disassemble the android app and find how the app communicate with the watch and then make a simple clear app with all the commands available.
If you have any questions please contact me