Arduino receiving UDP or IP

[jaapnoordzij]

I want to use the possibility to receive Midi through UDP (or IP). In your Desktop examples you provide for both the possibility:

• Sending MIDI to the Arduino TCP Server
• Sending MIDI to the Arduino UDP Server

Both state: "If we have deployed the MidiUDPServer sketch we can send MIDI messages to Arduino:"

But I cannot find an MidiUDPServer sketch.

• There is only a "udp-send" example sketch but no udp-receive (with UDP server)
• There is an ip-receive example but the code in the loop is using "out" (sending messages)

Could you please give me some hints to get this working ? Currently I am using your AppleMidi solution which works fine.

Thank you Jaap

[pschatzmann]

I think you can use the applemidi-receive.ino as starting point and just replace the AppleMidiServer with the MidiUdpServer

You are right: the ip-receive.ino looks wrong to me: I corrected it to what I think it should be

[jaapnoordzij]

Thank you, no success yet but I will work on it ....

[jaapnoordzij]

I have replaced the AppleMidiServer with the MidiUdpServer as you suggested. Because the server loop returns a void and not a bool i have also replaced the Arduino sketch loop:

void loop() {
  apple.loop();
}

Is that correct ? I don't think so because the sketch does not react to the received UDP messages. The programs starts with:

Connected to IP address: 192.168.2.130
Info:    bool midi::MidiUdpServer::begin(IPAddress, int)
Info:    void midi::MidiStreamIn::setup(Stream*, midi::MidiParser*, bool)

That looks OK to me.

As an alternative I have also tried the unmodified appplemidi-receive.ino. On my Mac I have used the UDP Send python program:

import mido
import socket

UDP_IP = "192.168.2.130"
UDP_PORT = 5004
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) 

inport = mido.open_input('USB MIDI Interface')
for msg in inport:
    print(msg)
    sock.sendto(msg.bin(), (UDP_IP, UDP_PORT))

In this case the sketch recieves the UDP messages alright but does not seem to recognize them: [APPLEMIDI] parse_udb_datagram: unknown command: 0x00004590

Any suggestions to try ?

[pschatzmann]

Did you call the begin with the correct port. If you dont specify anything the default port 5008 is used. Can you share your sketch ?

[jaapnoordzij]

/**
 * @file applemidi-receive.ino
 * @author Phil Schatzmann
 * @brief Receiving Midi messages using Apple Midi
 * @date 2021-12-24
 * 
 * @copyright Copyright (c) 2021
 */

#include <WiFi.h>
#include "Midi.h"

MidiCallbackAction action;
MidiUdpServer apple(&action);

const char *SSID = "xxx";
const char *PWD = "yyy";

void onNoteOn(uint8_t channel, uint8_t note, uint8_t velocity) {
  Serial.print("onNoteOn: ");
  Serial.println(note);
}

void onNoteOff(uint8_t channel, uint8_t note, uint8_t velocity) {
  Serial.print("onNoteOff: ");
  Serial.println(note);
}

void setupWIFI() {
  Serial.begin(119200);
  MidiLogLevel = MidiInfo;

  WiFi.begin(SSID, PWD);
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print('.');
    delay(1000);
  }

  Serial.print("Connected to IP address: ");
  Serial.println(WiFi.localIP());
}

void setup() {
  action.setCallbacks(onNoteOn, onNoteOff);
  setupWIFI();
  apple.begin(5004);
}

void loop() {
  // if (!apple.loop()){
  //   delay(10);
  // }
  apple.loop();
  // delay(10);
}```

[pschatzmann]

It think it should be something like apple.begin(IPAddress(192, 168, 2, 1),5004); where the address would point back to the sender

[jaapnoordzij]

You are right, the MidiUdpServer begin requires an IP address, wonder why the compiler does not complain. However, No change, still no incoming messages apple.begin(IPAddress(192,168,2,111),5004); which is the address of the sender, my Mac