Hello!

I'd like to ask for question. I'm sending data via UPD from processing to grasshoper3d and back. I need to processing wait for incoming data. I'm using while loop with with delay method for waiting, but there is problem with program stability. Stability is influenced by delay time and frameRate...
Is better way how to wait for data?

Thanks for yours reply.

1. import hypermedia.net.*;
   UDP udp;  // define the UDP object
   
   ArrayList importMessage = new ArrayList(1);  // arraylist for storing incoming message
   
   void setup() {
     frameRate(30);
    
     // create a new datagram connection on port 6001
     udp = new UDP( this, 6001 );
   
    
     // first value in arraylist
     importMessage.add("0");
   }
   
   void draw(){
   
     
    
     // wait for incoming data
     // if is delay small it can happens program is not stable (stop working after a few iterations)
     // there is relation between frameRate and delay
     boolean listenBitch = false;
     //println(listenBitch);
     while(listenBitch == false){
       if( importMessage.size() == 0){
       //wait loop
       udp.listen( true );
       }
       else{
       listenBitch = true;
       //println(listenBitch);
       }
     delay(100);  // Stops the program for 100 milliseconds
     }
    
     // send data to grasshopper
     // 1 + last incoming message  
     dataSend( str( 1 + float((String)importMessage.get(0))  ));  
     println(importMessage.get(0));
    
     //stop the program
     if( float((String)importMessage.get(0)) > 2000){
       noLoop();
     }
    
    
     //clear arraylist
     importMessage.clear();
    
   }
   
   
   //void keyPressed(){
   //  dataSend( str( 1 + float((String)importMessage.get(0))  ));  
   //  println(importMessage.get(0));
   // 
   //  importMessage.clear();
   //}
   
   
   
   void dataSend(String message) {
   
     //String message  = String.valueOf(mouseX) + " " + String.valueOf(mouseY);//str( "hello" );    // the message to send
     //message  = "10,10,10 "+"30,30,30 ";
     String ip       = "127.0.0.1";    // the remote IP address
     int port        = 6002;        // the destination port
    
    
    
     // send the message
     udp.send( message, ip, port );
     //println("Sending message: \""+message+"\"");
   }
   
   
   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 );
     importMessage.add(message);
   }