https://en.m.wikipedia.org/wiki/ESP32 has builtin BlueTooth and WiFi so you might start with http://omz-software.com/pythonista/docs/ios/cb.html
Welcome!
This is the community forum for my apps Pythonista and Editorial.
For individual support questions, you can also send an email. If you have a very short question or just want to say hello — I'm @olemoritz on Twitter.