Why am I unable to receive push Notification on Android by ionic framework

Question

I had written this small test app to test the New ionic push and in the backend I am using Android Google Cloud Messaging Service. I am getting success from the android GCM in my frontEnd

data: Object
canonical_ids: 0
failure: 0
multicast_id: 8830892721591033000
results: Array[1]
success: 1
__proto__: Object

This is the front End Code

app.run(function($ionicPlatform, $ionicPush,$http) {
  $ionicPlatform.ready(function() {
   $ionicPush.init({
  "onNotification": function(notification) {
    var payload = notification.payload;
    console.log(payload);
    console.log(notification);
  },
  "onRegister": function(data) {
    console.log(data.token);
  }
});

$ionicPush.register(function(data){
  var reg = {
    regId : data.token
   };
  $http.post('http://app.example.com/sendPushNot', reg)
  .then(function(response){
    console.log(response);
  }, function (error){
    console.log(error);
  });
});

and in my backend

var message = new gcm.Message({
    collapseKey: 'demo',
    priority: 'high',
    contentAvailable: true,
    delayWhileIdle: true,
    timeToLive: 3,
    //restrictedPackageName: "somePackageName",
    dryRun: false,
    data: {
        key1: 'message1',
        key2: 'message2'
    },
    notification: {
        title: "Hello, World",
        icon: "ic_launcher",
        body: "This is a notification that will be displayed ASAP."
    }
});

    console.log(message);
    var sender = new gcm.Sender('AIzaSyB9Lz**********9mHJuH5if1m5k5JOVMw'); 

    var regTokens =  [];
    regTokens.push(req.body.regId);

        sender.send(message, { registrationTokens: regTokens }, function (err, result) {
            if (err) {
                console.error(err);
            }
            else {

                 console.log(result);
                 res.status(200);
                 res.set('Content-Type', 'text/html');
                 res.send(result);
            }
        });   

but still I am unable to receive any push Notification. I am not understanding the reason why?

Any anybody else spot anything. I am using node-gcm in the backend

EDIT EDIT EDIT
The problem could be anywhere server or frontEnd.
I have exactly narrowed down the scope of the problem using this. Now using this as there is no payload I am able to see the console logs in onNotification listener. It means My listener is correct... partially as I am able to send the data from server to Frontend by using only data field. Now the problem could be that Ionic.Push is not capable of receiving the notifications or could be that node-gcm is not able to send the plugins correctly Behold your breath for the ultimate showdown between me and these badass plugins.

Answer 1

Waitting for answers