AppleMIDI (aka rtpMIDI) for Arduino

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

Features

Build on top of the popular FortySevenEffects MIDI library
Tested with AppleMIDI on Mac OS (Catalina) 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')
Compiles on Arduino, MacOS (XCode) and Windows (MSVS)

Installation

From the Arduino IDE Library Manager, search for AppleMIDI

This will also install FortySevenEffects MIDI library

Basic Usage

#include <Ethernet.h>
#include <AppleMIDI.h>

APPLEMIDI_CREATE_DEFAULTSESSION_INSTANCE(); 

void setup()
{
  MIDI.begin(1);
  
  // Optional
  AppleMIDI.setHandleConnected(OnAppleMidiConnected);
}

void loop()
{
  // Listen to incoming notes
  MIDI.read();
  
  // Send MIDI note 40 on, velocity 55 on channel 1
  MIDI.sendNoteOn(40, 55, 1);
}

void OnAppleMidiConnected(uint32_t ssrc, const char* name) {
}

APPLEMIDI_CREATE_DEFAULTSESSION_INSTANCE(); creates 2 instance: MIDI and AppleMIDI. MIDI is the instance that manages all MIDI interaction, AppleMIDI is the instance this manages the rtp transport layer.

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

This library is not using any dynamic memory allocation methods - all buffers have a fixed size, set in the AppleMIDI_Settings.h file, avoiding potential memory leaks and memory fragmentation.

The minimum buffer size (MaxBufferSize) should be set to 64 bytes (also the default). Setting it to a higher value will make sending larger SysEx messages more efficiant (large SysEx messages are chopped in pieces, the larger the buffer, the less pieces needed), at the price of a bigger memory footprint.

MaxNumberOfParticipants is another way to cut memory - each particpants uses approx 300 bytes. Default number of participants is 1 (using 2 sockets). Beware: the number of sockets on the Arduino is limited. The W5100 support 4, the W5200 and W5500 based IP chips can use 8 sockets. (Each participant uses 2 sockets: port 5004 and 5004+1). (Base port can be set in APPLEMIDI_CREATE_DEFAULT_INSTANCE)

Network Shields

Arduino Ethernet shield (Wiznet W5100 and W5500)
Arduino Wifi R3 shield
MKR ETH shield
Teensy WIZ820io W5200

Arduino IDE (arduino.cc)

1.8.10

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.

hippyau / Arduino-AppleMIDI-Library