UDP test Code

Processing code for communication between Arduino and Processing via Lantronix

/**
* (./) udp.pde - how to use UDP library as unicast connection
* (cc) 2006, Cousot stephane for The Atelier Hypermedia
* (->) http://hypermedia.loeil.org/processing/
*
* Create a communication between Processing<->Pure Data @ http://puredata.info/
* This program also requires to run a small program on Pd to exchange data 
* (hum!!! for a complete experimentation), you can find the related Pd patch
* at http://hypermedia.loeil.org/processing/udp.pd
*
* -- note that all Pd input/output messages are completed with the characters
* ";\n". Don't refer to this notation for a normal use. --
*/

// import UDP library
import hypermedia.net.*;


UDP udp;  // define the UDP object

/**
* init
*/
void setup() {

 // create a new datagram connection on port 6000
 // and wait for incomming message
 udp = new UDP( this, 6002);
 //udp.log( true );         // <-- printout the connection activity
 udp.listen( true );
}

//process events
void draw() {;}

/**
* on key pressed event:
* send the current key value over the network
*/
void keyPressed() {
  
   String message  = str( key );    // the message to send
   String ip       = "localhost";    // the remote IP address
   int port        = 10002;        // the destination port
  
   // formats the message for Pd
   //message = message+";\n";
   // send the message
   udp.send( message, ip, port );
  
}

/**
* To perform any action on datagram reception, you need to implement this
* handler in your code. This method will be automatically called by the UDP
* object each time he receive a nonnull message.
* By default, this method have just one argument (the received message as
* byte[] array), but in addition, two arguments (representing in order the
* sender IP address and his port) can be set like below.
*/
// void receive( byte[] data ) {             // <-- default handler
void receive( byte[] data, String ip, int port ) {    // <-- extended handler


 // get the "real" message =
 // forget the ";\n" at the end <-- !!! only for a communication with Pd !!!
 data = subset(data, 0, data.length-2);
 String message = new String( data );

 // print the result
 println( "receive: \""+message+"\" from "+ip+" on port "+port );
}