title: Cant send messages between TCP Server and Node.js
body: <p>I have created a python tcp server and i am using node.js socketio module to communicate between browser and tcp server. Hierarchically they are connected like:
  Browser->Node.js->Python TCP Server Browser&lt;-Node.js&lt;-Python Tcp Server
  I can connect with Node.js to Tcp Server, i can send messages but right after i send the first message i cant send any message from Node.js to TCP Server, similarly after i send a message from TCP Server to Node.js i cant send messages after the first message.
  My Node.js code: </p>
  
  <pre><code>var http = require('http');
  var mysql = require('mysql');
  var net = require('net');
  var socketio = require('socket.io');
  
  ////////////////////////////////////////////////////////////////
  // tcp socket
  // Connection part to my python server
  ////////////////////////////////////////////////////////////////
  var tcpClient = net.connect({port: 3001, host:"localhost"});
  tcpClient.setEncoding("utf8");
  
  tcpClient.on('connect',function() {
      console.log('client connected');
      tcpClient.write('node - tcp server a bağlanıldı!');
  });
  
  tcpClient.on('data', function(data) {
      console.log("tcp den gelen mesaj = "+ data.toString());
  });
  
  tcpClient.on('end', function() {
      console.log('client disconnected');
  });
  
  tcpClient.on('error', function(data) {
      console.log("error = " + data);
  });
  
  ////////////////////////////////////////////////////////////////
  // web socket
  ////////////////////////////////////////////////////////////////
  var io = socketio.listen(3000);
  io.sockets.on('connection', function (socket) {
      socket.on('sendMessage', function (data) {
          tcpClient.write("node - sendMessage");
          console.log(data);
      });
  
      socket.on('login', function (data) {
          tcpClient.write('node - login');
          console.log(data);
      });
  });
  </code></pre>
  
  <p>I have checked my Python TCP Server with Python Client which i coded and everything seems alright. What might be the problem? Thanks in advance.</p>