import processing.net.*;

/*
  Lantronix UDP Device Query
 
 Sends out a UDP broadcast packet to query a subnet for Lantronix
 serial-to-ethernet devices.
 Lantronix devices are programmed to respond to UDP messages received on
 port 30718.  If a Lantronix device receives the string 0x00 0x00 0x00 0xF6, 
 it respond with a UDP packet containing the status message on port 30718.
 See the Lantronix integration guide from http://www.lantronix guid for the details.
 
 This program uses the Hypermedia UDP library available at 
 http://hypermedia.loeil.org/processing/
 
 by Tom Igoe
 Created 18 April 2006
 */

// import UDP library
import hypermedia.net.*;


UDP udp;                  // define the UDP object
int queryPort = 30718;    // the port number for the device query
String broadcastIpAddress = "128.122.151.255";  // fill in IP address here

void setup() {

  // create a new connection to listen for 
  // UDP datagrams on query port
  udp = new UDP(this, queryPort);
// listen for incoming packets:
    udp.listen( true );

}

//process events
void draw() {
  // twiddle your thumbs.  Everything is event generated.
}

/*
 send the query message when any key is pressed:
 */
void keyPressed() {
  byte[] queryMsg = new byte[4];
  queryMsg[0] = 0x00;
  queryMsg[1] = 0x00;
  queryMsg[2] = 0x00;		
  queryMsg[3] = (byte)0xF6;

  // send the message
  udp.send( queryMsg, broadcastIpAddress, queryPort );
}

/*
  listen for responses
 */
void receive( byte[] data, String ip, int port ) {	

  String inString = new String(data);    // data converted to a string
  int[] intData = int(data);             // data converted to ints
  int i = 0;                             // counter
  // print the result:
  println( "received "+inString+"  from "+ip+" on port "+port );

  // parse the payload for the appropriate data:
  print("Opcode: ");
  println(intData[3]);

  // if the fourth byte is , we got a status reply:
  if (intData[3] == 0xF7) {		
    // firmware data is bytes 4 to 20:
    print("Firmware data: ");
    for (i=4; i < 20; i++) {
      print(" " + Integer.toHexString(intData[i]));
    }
    // MAC address is bytes 24 to 30 (the end):
    print("\nMAC Addr: ");
    for (i=24; i < intData.length; i++) {
      print(" " + Integer.toHexString(intData[i]));
    }
    print("\n\n");
  }
}