syndilights/displayclient/html/ws_udp.js

// listener UDP version
// it wants some binary data
//
// data format
// basically it's the frame format of the frame server
// byte "s2l\n<8<18 "
// byte z (can be ignored)
// byte \n
// byte windows 12*4 RGBA values '\n'    repeated 8 times for the 8 rows
// byte segments 8*4 RGBA values '\n'    repeated 12 times for the top row

// set to true for debugging and seeing messages sent to server
var verbose = false;

var count = 0;
var clients = {};

var http = require('http');
var dgram=require('dgram');
var server = http.createServer(function(request, response) {});

server.listen(1234, function() {
	console.log((new Date()) + ' Webserver is listening on port 1234');
});

var WebSocketServer = require('websocket').server;
wsServer = new WebSocketServer({
	httpServer: server
});

var server = dgram.createSocket('udp4');
server.bind(4422, '127.0.0.1');

console.log((new Date()) + ' UDP display is listening on port 4422');


wsServer.on('request', function(r) {

	var connection = r.accept('echo-protocol', r.origin);

	// Specific id for this client & increment count
	var id = count++;

	// Store the connection method so we can loop through & contact all clients
	clients[id] = connection

	console.log((new Date()) + ' Connection accepted [' + id + ']');
	// clients[id].sendUTF("Welcome to the server. You are connected. This message has been pushed to you.");

	// Create event listener
	connection.on('message', function(message) {

		// The string message that was sent to us
		var msgString = message.utf8Data;
		
		// Loop through all clients
		for(var i in clients){
			// Send a message to the client with the message
			clients[i].sendUTF(msgString);
		}
	});

	// Create event listener for close
	connection.on('close', function(reasonCode, description) {
		delete clients[id];
		console.log((new Date()) + ' Peer ' + connection.remoteAddress + ' disconnected.');
	});
});

var sendTime = function () {
	var now, i = 0;

	// get time now
	now = new Date();

	// send time to all clients
	for(i in clients) {
		// Send a message to the client with the message
		clients[i].sendUTF(now);
	}

	// repeat in 5 seconds
	setTimeout(sendTime, 5000);
};

server.on("message", function (msg, rinfo) {
  if( verbose ) {
    console.log("server got (" + msg.length + ") bytes: " + msg + " from " +
    rinfo.address + ":" + rinfo.port);
  }

  for(i in clients) {
     // Send a message to the client with the message
     clients[i].sendUTF(msg);
  }
});
// every 5 seconds send the date/time