I managed to send MIDI commands from a Pi Pico W to my phone using Bluetooth LE. This is a somewhat long-winded explanation of how I got it working. Working code is here: rabbadubdub.z1...
Thanks for sharing your findings and code. I am building a portable midi controller which I want to add bluetooth midi. I will use your explanation and code as a starting point during my project.
Thanks so much! Your video and code jump-started what was going to be a fairly painful BLE experience. Works great! Am using your code as a model for a picoW BT-LE sustain modulation pedal. If I get it solid enough for general public sharing and consumption, is it okay to post your code on a Github with attribution?