Support Firmata over MIDI

[cstawarz]

Would allow a wired connection on iOS devices.

Probably need to use Core MIDI to talk to the device.

Is the Firmata protocol MIDI-compliant enough to keep Core MIDI happy?

Boards with builtin USB (including the Feather M0) can use the Arduino MIDIUSB library to act as a USB-MIDI device.

Apple's Lightning to USB 3 Camera Adapter can be used to connect USB-MIDI devices.

Other potentially useful info:

• https://www.instructables.com/Send-and-Receive-MIDI-with-Arduino/
• https://www.iconnectivity.com/blog/2019/5/10/an-introduction-to-midi-connections

[cstawarz]

This issue has been mentioned on MWorks Support. There might be relevant details there:

https://mworks.discourse.group/t/using-adafruit-feather-32u4-bluefruit-le/863/4