Chapter 19: Example 19-3: Server Broadcasting a Number (0-255)

// Learning Processing
// Daniel Shiffman
// http://www.learningprocessing.com

// Example 19-3: Server broadcasting a number (0-255)

// Import the net libraries
import processing.net.*;

// Declare a server
Server server;
PFont f;
int data = 0;

void setup() {
  size(200,200);
  // Create the Server on port 5204
  server = new Server(this, 5204);
  f = createFont("Arial",20,true);
}

void draw() {
  background(255);
  
  // Display data
  textFont(f);
  textAlign(CENTER);
  fill(0);
  text(data,width/2,height/2);
  
  // Broadcast data (the number is continuously sent to all clients because write() is called every cycle through draw())
  server.write(data);
  
  // Arbitrarily changing the value of data randomly
  data = (data + int(random( -2,4))) % 256;
}

// The serverEvent function is called whenever a new client connects.
void serverEvent(Server server, Client client) {
  println(" A new client has connected: "+ client.ip());
}