AppleMIDI (rtpMIDI) for Arduino

Enables an Arduino with IP/UDP capabilities (Ethernet shield, ESP8266, ESP32, ...) to particpate in an AppleMIDI session.

Features

• Tested with AppleMIDI on Mac OS (High Sierra) and using rtpMIDI from Tobias Erichsen on Windows 10
• Send and receive all MIDI messages
• Uses callbacks to receive MIDI commands (no need for polling)
• Automatic instantiation of AppleMIDI object (see at the end of 'AppleMidi.h')

Installation

From the Arduino IDE Library Manager, search for AppleMIDI

Basic Usage

#include "AppleMidi.h"

APPLEMIDI_CREATE_DEFAULT_INSTANCE(); 

void setup()
{
  // ...setup ethernet connection
  AppleMIDI.begin("test"); // 'test' will show up as the session name
}

void loop()
{
  AppleMIDI.run();
  // ...
  
  // Send MIDI note 40 on, velocity 55 on channel 1
  AppleMIDI.sendNoteOn(40, 55, 1);
}

More usages in the examples folder

Hardware

• Arduino/Genuino (Mega, Uno, Arduino Ethernet, MKRZERO, ...)
• ESP8266 (Adafruit HUZZAH ESP8266, Sparkfun ESP8266 Thing Dev)
• ESP32 (Adafruit HUZZAH32 – ESP32 Feather Board)
• Teensy 3.2
• Adafruit Feather M0 WiFi - ATSAMD21 + ATWINC1500

Memory usage

The code has been pseudo optimized to minimize the memory footprint. Internal buffers also use valuable memory space. The biggest buffer PACKET_MAX_SIZE is set to 350 by default in AppleMidi_Settings.h. Albeit this number is somewhat arbitratry (large enough to receive full SysEx messages), it can be reduced significantly if you do not have to receive large messages.

On an Arduino, 2 sessions can be active at once (W5100 can have max 4 sockets open at the same time, each session needs 2 UDP sockets). Setting MAX_SESSIONS to 1 saves 228 bytes (each session takes 228 bytes).

Save memory (about 2000 bytes) when the device does not initiate sessions by #undef APPLEMIDI_REMOTE_SESSIONS in AppleMidi_Settings.h. See the EthernetShield_NoteOnOffEverySec.ino example

Network Shields

• Arduino Ethernet shield (Wiznet W5100)
• Arduino Wifi R3 shield
• MKR ETH shield
• Teensy WIZ820io W5200

Arduino IDE (arduino.cc)

• 1.8.9

Contributing

I would love to include your enhancements or bug fixes! In lieu of a formal styleguide, please take care to maintain the existing coding style. Please test your code before sending a pull request. It would be very helpful if you include a detailed explanation of your changes in the pull request.