GoProKeepAliveUDP.pde

import java.io.*; 
import java.net.*; 

void setup() {
  thread("keepAlive");
}

void draw() {
}

void keepAlive() {
  String UDP_IP = "10.5.5.9";
  int UDP_PORT = 8554;
  int KEEP_ALIVE_PERIOD = 2500;

  while (true) {
    println("sending message...");
    try {
      DatagramSocket clientSocket = new DatagramSocket(); 
      String sendMessage = "_GPHD_:0:0:2:0.000000\n";
      byte[] sendData = sendMessage.getBytes();
      InetAddress IPAddress = InetAddress.getByName(UDP_IP);
      DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, UDP_PORT);
      clientSocket.send(sendPacket);
      clientSocket.close();
      println("message sent!");
    } catch (Exception ex) {
      println("ERROR!");
    }
    delay(KEEP_ALIVE_PERIOD);
  }
}