ESP32-BLE-MIDI

An Arduino library to use Midi over Bluetooth Low Energy (BLE) on ESP32 boards.
If you find it useful you can if you want.

Quick start

#include <Arduino.h>
#include <BLEMidi.h>

void setup() {
  Serial.begin(115200);
  Serial.println("Initializing bluetooth");
  BLEMidiServer.begin("Basic MIDI device");
  Serial.println("Waiting for connections...");
  //BLEMidiServer.enableDebugging();  // Uncomment if you want to see some debugging output from the library
}

void loop() {
  if(BLEMidiServer.isConnected()) {             // If we've got a connection, we send an A4 during one second, at full velocity (127)
      BLEMidiServer.noteOn(0, 69, 127);
      delay(1000);
      BLEMidiServer.noteOff(0, 69, 127);        // Then we stop the note and make a delay of one second before returning to the beginning of the loop
      delay(1000);
  }
}

Check the header file here to view all available MIDI commands and callbacks.

Changes

• v0.3.2

  • 2023-04-25
    • Added BLEMidi::end() to stop the BLE client or server.

• v0.3.1

  • 2023-03-12
    • Added a simple knob example

• v0.3.0

  • 2022-12-27
    • Migrated to NimBLE using NimBLE-Arduino library

• 2022-01-23

  • Merged PR from trdenton : Support for MMC transport controls

• v0.2.2

  • 2021-09-20
  • Bug corrections : connection/disconnection callbacks weren't called when they where set up after BLEMidiServer.begin(), and no more connection were accepted after a disconnection. Thanks to Kim for the information provided.

• v0.2.1

  • 2021-03-16
  • Bug correction : the WDT used to reset the ESP32 when lots of messages were received, because the IDLE task didn't have time to call esp_task_wdt_reset

• v0.2.0

  • 2021-03-12
  • Implemented support for running status messages
  • 2021-03-13
  • After touch support

• v0.1.2

  • 2021-03-02
  • Added pitch bend callback
  • Added a range parameter for pitch bend sending
  • 2021-03-11
  • Added an a new overload for pitch bend sending

• v0.1.1

  • 2020-12-29
  • Integrated bug fix from Georaura
  • 2020-12-30
  • Implemented packet timestamps

Future work

• Add some more examples

• Add documentation, with Doxygen ?

• Add keywords.txt for Arduino IDE

• Add support for realtime messages ?

• Add debugging messages in BLEMidiServer ?

• Better debug function

Thanks

Thanks to the authors of those pages / pieces of code :

• https://github.com/neilbags/arduino-esp32-BLE-MIDI/blob/master/BLE_MIDI.ino (write midi messages)
• https://gist.github.com/johnty/cbfa66c3369a692410f3493c20b2b3e2 (read and write)
• https://circuitdigest.com/microcontroller-projects/esp32-ble-client-connecting-to-fitness-band-to-trigger-light (initiate the connection to another bluetooth device)
• and the Arduino BLE_Client example sketch for ESP32 boards

Message to users

If you make some noise with it, I would be glad to see your projects ! Don't hesitate to drop me an e-mail.