app.js

var PORT = 1337;
var HOST = '127.0.0.1';
var ROWS = 16;
var COLS = 40;

var io = require('socket.io').listen(8080);
io.set('log level', 1);

io.sockets.on('connection', function (socket) {
  console.log('client connected');
});

var ansi = require('ansi')
  , cursor = ansi(process.stdout);
var dgram = require('dgram');
var server = dgram.createSocket('udp4');

server.on('listening', function () {
    var address = server.address();
    console.log('UDP Server listening on ' + address.address + ":" + address.port);
});

server.on('message', function (message, remote) {

    var checksum = message.slice(0,4);
    var picbuffer = message.slice(4);
    cursor.write('\033[2J');

    var picarray = [];

    for (var i = 0; i < picbuffer.length; i+=3){
      if (i % COLS == 0) cursor.reset().write('\n');
      var pixelbuffer = message.slice(i, i+3);
      cursor.rgb(0,0,0).bg.rgb(pixelbuffer[0],pixelbuffer[1],pixelbuffer[2]).write("X");

      picarray.push(pixelbuffer[0]);
      picarray.push(pixelbuffer[1]);
      picarray.push(pixelbuffer[2]);
      picarray.push(255);
    }

    cursor.reset();

    io.sockets.emit('pic', picarray);

});

server.bind(PORT, HOST);