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#socket.io 통신과 websocket 통신 예제
(websocket 통신은 브라우저 특성이 있어서 지원되지 않는 경우도 있어, socket.io 사용)
대신 websocket의 경우 web(http)를 기반으로 하기 때문에, 방화벽에서 걸리는 경우가 적다.
  #socket.io를 이용한 통신 (server)
 var io = require('socket.io').listen(8000);
//var io = require('socket.io').listen(8000);
 io.sockets.on('connection', function (socket) {
  socket.emit('example message 1', { hello: 'world 1' });
   socket.on('example message 2', function (data) {
    console.log(data);
  });
});
  -------------------------------------
 #socket.io를 이용한 통신 (client - web)
 -> 웹브라우저에서 통신 
 <!DOCTYPE HTML>
<html>
<head>
  <title>Example Socket.IO</title>
</head>
<body>
 <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="http://192.168.0.105:8000/socket.io/socket.io.js"></script>
<script type="text/javascript">
var socket = io.connect('http://192.168.0.105:8000');
socket.on('example message 1', function (data) {
  $('#messages').append($('<li>').text('Received message: ' + data.hello));
});
 socket.emit('example message 2', { hello: 'world 2' });
</script>
Messages: <ul id="messages"></ul>
</body>
</html>
 ======================================
 #websocket (server, run node websocket.js)
 var WebSocketServer = require('websocket').server;
var http = require('http');
 var server = http.createServer(function (req, res) {
  console.log('Received request for ' + req.url);
  res.writeHead(404);
  res.end();
});
 server.listen(8000, function () {
  console.log('Server is listening on port 8000');
});
 wsServer = new WebSocketServer({
  httpServer: server,
  autoAcceptConnections: false
});
 wsServer.on('request', function (request) {
  var connection = request.accept('example-echo', request.origin);
  connection.on('message', function (message) {
    if (message.type === 'utf8') {
      console.log('Received message: ' + message.utf8Data);
      connection.sendUTF(message.utf8Data);
    }
    else if (message.type === 'binary') {
      connection.sendBytes(message.binaryData);
    }
     connection.on('close', function (reasonCode, description) {
      console.log('Peer ' + connection.remoteAddress + ' disconnected.');
     });
  });
});
 -----------------------------------------
 #websocket (client, web)
<!DOCTYPE HTML>
<html>
<head>
  <title>Example WebSocket</title>
</head>
<body>
 <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script type="text/javascript">
if ('WebSocket' in window) {
  var ws = new WebSocket('ws://192.168.0.105:8000', 'example-echo');
   ws.onopen = function () {
    $('#status').text('connected');
     for (var i = 0; i < 10; i++) {
      ws.send('Hello ' + i);
    }
  };
   ws.onmessage = function (evt) {
    $('#messages').append($('<li>').text('Received message: ' + evt.data));
  };
   ws.onclose = function () {
    $('#status').text('connection is closed');
  };
}
else
  $('#status').text('WebSocket not supported.');
</script>
 Status: <span id="status"></span><br /><br />
Messages: <ul id="messages"></ul>
</body>
</html>
 ============================================