BLE MIDI usin a HM-10 module

[KontinuumLab]

I'm trying to make a BLE MIDI device using an Arduino Pro Micro and a HM-10 module.
I've looked at the BLEMIDI transport layer from lathoub, but it works with ESP32 and the Arduino Nano BLE boards.
I think it would be awesome to add BLE-MIDI to the 32u4 boards, specifically because they also do MIDI over USB, so it would be cheap and easy to make a device that could do both.
As much as I would love to try to adapt/expand the library for my use case, my attempts so far have just left me scratching my head.

I have the HM-10 sending simple serial communication to my phone (Using the "Serial Bluetooth Terminal" app), so the hardware is working fine. Using this sketch:

void setup()
{

  Serial.begin(9600);
  Serial1.begin(9600);
}
void loop()
{
  if (Serial1.available())
  {
    char i = Serial1.read();
    Serial.print(i);
    Serial1.print("Received");
  }
}

Using a simple Serial MIDI sketch, I'm also able to send bytes and receive them on my phone, but of course it doesn't register as a MIDI device. Using this sketch:

#include <MIDI.h>

// Create and bind the MIDI interface to the default hardware Serial port
MIDI_CREATE_DEFAULT_INSTANCE();

void setup()
{
    MIDI.begin(MIDI_CHANNEL_OMNI);  // Listen to all incoming messages
}
void loop()
{
    // Send note 42 with velocity 127 on channel 1
    MIDI.sendNoteOn(42, 127, 1);

    // Read incoming messages
    MIDI.read();
}

Does anyone know of an existing way to do this, or have the skills/desire to expand the existing library with 32u4 functionality?
Any help would be much appreciated.

[lathoub]

The HM-10 is a hardware rapper around the TI CC2540 chip, that has AFAIK 1 fixed service and 1 fixed characteristic (no BLE-MIDI) - so you can't have the HM-10 to announce itself as a true BLE-MIDI device (but that you knew already).

expand the existing library with 32u4 functionality

The ATMega 32u4 has no BLE-MIDI capabilities, and it will always depend on additional hardware to be able to support BLE-MIDI (eg Adafruit Feather 32u4 Bluefruit LE). So I do not understand your question to expand the existing library with 32u4 functionality.

Have you looked at Hairless MIDI?

[KontinuumLab]

Thanks for the swift answer!

you can't have the HM-10 to announce itself as a true BLE-MIDI device (but that you knew already).

I only knew that I hadn't been able to do it, but was hoping that it was possible. Alas, you cleared that up for me.

The ATMega 32u4 -/- will always depend on additional hardware to be able to support BLE-MIDI (eg Adafruit Feather 32u4 Bluefruit LE)

I was simply hoping that the HM-10 could be that additional hardware, with the right changes to the MIDI library.
From what I understand now, my only real option for a device that can do both USB MIDI and BLE MIDI would be the Feather, like you mention. It's not exactly cheap though...
Do I understand correctly that the USB MIDI support on that is still a work in progress? (From here: https://github.com/lathoub/Arduino-USBMIDI)
Another possible option would be the Arduino Nano 33 BLE, but has the same problem.
Wish I could help you with it, but I'm afraid most of this deep library work goes well above my head.
The ESP32 is great of course, but doesn't have native USB.

Have you looked at Hairless MIDI?

Yes, but I'm specifically looking for a good way to connect my cheap DIY MIDI controllers to my phone, so that's not going to help.

Oh, well.
Thanks again for your help with this, and thanks for all the work you do.