if you dont mind use this
https://github.com/qntbkk/BluetoothConnectMobile
npm install
gulp build
get mpk at /dist/...mpk
Currently the phonegap route would be the way to go. I you search for that you will find some examples like this one:
https://www.formget.com/phonegap-bluetooth/
This one would also be nice only android is not yet supported: https://developer.mozilla.org/en-US/docs/Web/API/Web_Bluetooth_API
Regards,
Ronald
[EDIT]
Ah, you ment the module in the appstore. This only works with the latest modeler version (7.23.3) and indeed the domain module is empty because it is a set of javascript actions. You still need the phonegap plugin though.