var protocol = require('./protocol');
var dgram = require('dgram');

var on = 0;
var speed = 256;


function lsb(value) { return value & 0xFF; }
function msb(value) { return (value >> 8) & 0xFF; }


setInterval(function()
{
  // 0x00, 0x10 = 4096
  on += speed;
  if (on <= 0 || on >= 4096)
    speed = -speed;

  var message = new Buffer([protocol.Command.SetMode, protocol.Mode.Static, lsb(on), msb(on)]);
  var client = dgram.createSocket('udp4');
  client.on('listening', function()
  {
    var address = client.address();
    console.log('UDP client listening on ' + address.address + ":" + address.port);
  });

  client.on('message', function (message, remote)
  {
    console.log(remote.address + ':' + remote.port +' - ' + message.toString('hex'));
    client.close();
  });

  client.send(message, 0, message.length, 3126, '10.138.2.12', function(err, bytes) {
      if (err) throw err;
      console.log('UDP message sent');
  });
}, 200);