framework-arduinoteensy-cxx20/libraries/OSC/examples/UDPReceive/UDPReceive.ino

#include <Ethernet.h>
#include <EthernetUdp.h>
#include <SPI.h>    

#include <OSCBundle.h>
#include <OSCBoards.h>

/*
* UDPReceiveOSC
* Set a tone according to incoming OSC control
*                           Adrian Freed
*/

//UDP communication


EthernetUDP Udp;
byte mac[] = {  
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; // you can find this written on the board of some Arduino Ethernets or shields

//the Arduino's IP
IPAddress ip(128, 32, 122, 252);

//port numbers
const unsigned int inPort = 8888;

//converts the pin to an osc address
char * numToOSCAddress( int pin){
    static char s[10];
    int i = 9;
	
    s[i--]= '\0';
	do
    {
		s[i] = "0123456789"[pin % 10];
                --i;
                pin /= 10;
    }
    while(pin && i);
    s[i] = '/';
    return &s[i];
}

/**
 * TONE
 * 
 * square wave output "/tone"
 * 
 * format:
 * /tone/pin
 *   
 *   (digital value) (float value) = freqency in Hz
 *   (no value) disable tone
 * 
 **/

void routeTone(OSCMessage &msg, int addrOffset ){
  //iterate through all the analog pins
  for(byte pin = 0; pin < NUM_DIGITAL_PINS; pin++){
    //match against the pin number strings
    int pinMatched = msg.match(numToOSCAddress(pin), addrOffset);
    if(pinMatched){
      unsigned int frequency = 0;
      //if it has an int, then it's an integers frequency in Hz
      if (msg.isInt(0)){        
        frequency = msg.getInt(0);
      } //otherwise it's a floating point frequency in Hz
      else if(msg.isFloat(0)){
        frequency = msg.getFloat(0);
      }
      else
        noTone(pin);
      if(frequency>0)
      {
         if(msg.isInt(1))
           tone(pin, frequency, msg.getInt(1));
         else
           tone(pin, frequency);
      }
    }
  }
}

void setup() {
  //setup ethernet part
  Ethernet.begin(mac,ip);
  Udp.begin(inPort);

}
//reads and dispatches the incoming message
void loop(){ 
    OSCBundle bundleIN;
   int size;
 
   if( (size = Udp.parsePacket())>0)
   {
     while(size--)
       bundleIN.fill(Udp.read());

      if(!bundleIN.hasError())
        bundleIN.route("/tone", routeTone);
   }
}