UDP<Server side>

static DatagramSocket socket;

static DatagramPacket receivePacket;

socket = new DatagramSocket(8080);

while(true){

byte[] buf = new byte[256];  //byte를 선언 합니다.

receivePacket = new DatagramPacket(buf, buf.length); 

socket.receive(receivePacket);

String msg = new String(receivePacket.getData(), 0, receivePacket.getLength());

msg = new String(msg.getBytes("8859_1"), "KSC5601");

//Client로 다시 전송합니다.

receivePacket = new DatagramPacket(buf, buf.length, clientAddr, port);Log.d("UDP", "Send " + new String(buf));

socket.send(receivePacket);

}