Processing

import processing.net.*; 

Client myClient; 
int dataIn; 

void setup() { 
  size(200, 200); 
  // Connect to the local machine at port 5204.
  // This example will not run if you haven't
  // previously started a server on this port.
  myClient = new Client(this, "127.0.0.1", 5204);
} 

void draw() { 
  if (myClient.active() == true) {
    if (myClient.available() > 0) { 
      dataIn = myClient.read();
    }
  } else {
    println("Client is not active."); 
  }
  background(dataIn);
} 

void mousePressed() {
  myClient.stop(); 
}