SocketIO Android not emitting connection event

Question

I'm using Android native socketio library and NodeJS.

    // on my Android activity
    private Socket mSocket;
    {
        try {
            mSocket = IO.socket("http://IP_OF_MY_SERVER");
        } catch (URISyntaxException e) {}
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mSocket.connect();
    }

.

// on my nodejs app
var restify = require('restify');
var server = restify.createServer({
  name: 'myapp',
  version: '1.0.0'
});
var io = require('socket.io')(server.server);

server.use(restify.acceptParser(server.acceptable));
server.use(restify.queryParser());
server.use(restify.bodyParser());

io.on('connection', function(socket){
  console.log('a user connected');
  socket.on('new-item', function(data) {
    console.log(data);
  });
});

I'm following official guides but still mSocket.connect() not emitting connection event and there is no a user connected on my console when I launch activity.

Can you please tell me what is I'm missing and how can I debug it?

---

EDIT

NodeJS app on my Ubuntu server : http://paste.ubuntu.com/14233470/

Android activity : http://paste.ubuntu.com/14233482/

---

EDIT 2

I've changed my code like suggested here :

var io = require('socket.io').listen(server);

And this time I'm getting this error when I launch the activity

myapp listening at http://104.131.99.145:3000

http.js:691
    throw new Error('Can\'t set headers after they are sent.');
          ^
Error: Can't set headers after they are sent.
    at ServerResponse.OutgoingMessage.setHeader (http.js:691:11)
    at ServerResponse.format (/var/www/biditapi.erayalakese.com/node_modules/restify/lib/response.js:145:10)
    at ServerResponse.send (/var/www/biditapi.erayalakese.com/node_modules/restify/lib/response.js:338:14)
    at emitRouteError (/var/www/biditapi.erayalakese.com/node_modules/restify/lib/server.js:201:13)
    at onRoute (/var/www/biditapi.erayalakese.com/node_modules/restify/lib/server.js:754:21)
    at Router.find (/var/www/biditapi.erayalakese.com/node_modules/restify/lib/router.js:608:5)
    at Server._route (/var/www/biditapi.erayalakese.com/node_modules/restify/lib/server.js:747:21)
    at routeAndRun (/var/www/biditapi.erayalakese.com/node_modules/restify/lib/server.js:705:14)
    at Server._handle (/var/www/biditapi.erayalakese.com/node_modules/restify/lib/server.js:725:9)
    at Server.onRequest (/var/www/biditapi.erayalakese.com/node_modules/restify/lib/server.js:326:14)
    at Server.EventEmitter.emit (events.js:98:17)
    at HTTPParser.parser.onIncoming (http.js:2108:12)
    at HTTPParser.parserOnHeadersComplete [as onHeadersComplete] (http.js:121:23)
    at Socket.socket.ondata (http.js:1966:22)
    at TCP.onread (net.js:525:27)

Answer 1

A few key notes:

1. Create a Socket object:

    private Socket mSocket; { try { mSocket = IO.socket(CHAT_SERVER_URL); // Your server's URL } catch (URISyntaxException e) { throw new RuntimeException(e); } } 

2. onCreate() : connect & set the socket error listener

    @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mSocket.on(Socket.EVENT_CONNECT_ERROR, onConnectError); mSocket.on(Socket.EVENT_CONNECT_TIMEOUT, onConnectError); mSocket.connect(); } private Emitter.Listener onConnectError = new Emitter.Listener() { @Override public void call(Object... args) { runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(getApplicationContext(), "Unable to connect to NodeJS server", Toast.LENGTH_LONG).show(); } }); } }; 

3. Disconnect the Socket in the onDestroy() method

    @Override protected void onDestroy() { super.onDestroy(); mSocket.disconnect(); mSocket.off(Socket.EVENT_CONNECT_ERROR, onConnectError); mSocket.off(Socket.EVENT_CONNECT_TIMEOUT, onConnectError); } 

Not getting the error toast is the first milestone to setting this up right.

4. Create a WLAN :

(Open the command line with admin privileges, run these commands:)

netsh wlan set hostednetwork mode=allow ssid=NodeSocket key=1234okok

netsh wlan start hostednetwork

Make sure that your Android device is connected to this network, & that your Node.js server is up & running.