App works while testing on browser but doesn't on actual device

Hi, there.

The issue(When on mobile)
When the device is ready socket get connected, everything works fine. When I send message or get some other info using sockets it works fine. But when I send message from the browser to the device it doesn’t deliver, But when i send message from the device to the browser it gets delivered.

I have tried several steps to debug this, but couldn’t come up with any useful info.

This several steps include:

  • showing an alert when the socket connects( Works, which shows the socket connection on mobile is connecting)

  • showing an alert when a message is received from socket which doesn’t work.

Below is my code

In app.component.ts I have this piece of code which fires when app is ready

import { SocketProvider } from "../providers/socket/socket";
//Some other imports
constructor(private socket: SocketProvider,){
  //Some codes runs here.
} => {
        if (user) {
          this.socket.connect(user.user).subscribe((io) => {
            this.socket.listenIncomingMessage();//Init the incoming message socket listener 
            this.util.presentAlert({ message: "Socket Did Connected" });//Shows an alert that socket did connect(which works)

In SocketProvider I have this piece of code

import { Injectable } from '@angular/core';
import { Http } from '@angular/http';
import 'rxjs/add/operator/map';
import * as io from "";
import { UtilProvider } from "../util/util";
import { DataProvider } from "../data/data";
import { Events } from "ionic-angular";
import { Observable } from "rxjs/Observable";

connect(user) {
    return Observable.create((observer) => {
      if (user !== undefined) {
        this.currentUser = user;
        this.socket = io('', { query: `userId=${this.currentUser._id}` });
        this.socket.on('connect', () => {
          //add-message-response emits from the node server.
          this.socket.on('add-message-response',(data, user)=>{
            //For debugging purpose on mobile I have this alert here
            this.util.presentAlert({title:'New Message',subTitle:'Connection Block',message:data.message});// This doesn't work on mobile device.
          // console.log(`Connected to socket ${}`);
          this.util.presentAlert({message:"Socket Connected"});//This works on mobile alert show each time socket connects

listenIncomingMessage() {
    this.util.presentAlert({message:"listenIncomingMessage Initiated"});//This alert shows up which means this function was initiated but the block code doesn't work
     * Listen to new message event from socket
     * Get the current page the user is, if the user is on chat interface don't vibrate
     * Except the fromId is != the current user chatting
    //From my debugging so far, this block of code below doesn't execute on mobile device but works on browser.
    this.socket.on('add-message-response',(data, user)=>{
      this.util.presentAlert({title:"newMessage",message:data.message});//For debugging purpose when on mobile, but this doesn't work on mobile device.'socket:incoming',data, user);//Publish some events'socket:skool-chat',data, user);//Publish some events
      if (this.util.currentComponent !== 'ChatPage') {
      } else {
        if (data.fromUserId !== {
          this.whenMessageComesAction(data);//Perform some actions

I would have taught this.socket.on('add-message-response',(data, user)=>{}); Wasn’t emitted from my server side that’s why is not working but it works on mobile device.

Please any clue/observation is highly needed, thank you.

Update: Just tested on android 4.4.2 and 5 its works fine my device is 7.0

getting the same issue. it is because of the socket client not able to establish the connection. that is why it is not working in mobile devlice.

have u resolve this issue?