The Dabble app from Stempedia has a nice UI for controlling embedded code over bluetooth. Their examples are written in C++ for arduino, but they've made the code open source. This library will help CircuitPython users to be able to use the Dabble app
Initial support is for the Game Controller mode.
https://thestempedia.com/docs/dabble/game-pad-module/ STEMPedia site https://github.com/STEMpedia/Dabble/tree/master Github repo