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Installation

Start Arduino as root.

Setup board

In Arduino/Preferences add https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json to Additional Boards Manager URLs.
In Arduino/Tools/Boards/Boards Manager/ search for esp32 and install it.
In Arduino/Tools/Boards/ESP Arduino/ select ESP32S2 Dev Module.
In Arduino/Tools/Port/ select /dev/ttyUSB0.

Add libraries

OSC

Download OSC as .ZIP file from https://github.com/CNMAT/OSC.git
In Arduino/Sketch/Include Library/ click Add .ZIP Library...
Choose the .zip file you downloaded from the repo.
In Arduino/Sketch/Include Library/ selecte OSC.

MPU6050

In Arduino/Sketch/Include Library/Manage Libraries serach for MPU6050 and install it (WARNING: plain MPU6050, not any xxxMPU5060xxx)

Python serial

In a terminal run: sudo pip install pyserial

BLE MIDI

Arduino install library BLE-MIDI 2.1.0 WARNING: NOT THE LAST VERSION
Check group name of the device: ls -l /dev/ttyACM0
Add user to tty group: sudo usermod -aG GROUPNAME USERNAME
Load the code to the board
Connect to it via Bluetooth
Check MIDI reception