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);
  println(myClient.ip());
}

void draw() {
  if (myClient.available() > 0) {
    dataIn = myClient.read();
  }
  background(dataIn);
}

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