Connection Error in Socket.io in Native Android

Question

I was creating a application using socket.io in native android application to communicate with websockets Tester. I have tested it using a online WebSocketServer , but each time when trying to check the connection in android device, 'Connection Error` is Logged.

Error : io.socket.engineio.client.EngineIOException: websocket error java.net.ProtocolException: Expected HTTP 101 response but was '404 Not Found'

onlineTestingPortal link :https://www.piesocket.com/websocket-tester

SocketServerCode:

package com.example.appsocket;


import android.util.Log;

import org.json.JSONObject;

import java.net.URISyntaxException;
import io.socket.client.IO;
import io.socket.client.Socket;
import io.socket.emitter.Emitter;
import io.socket.engineio.client.transports.WebSocket;

public class SocketServer {

    private Socket mSocket;

    private static SocketServer lbInstance = new SocketServer();

    public static SocketServer getInstance() {
        return lbInstance;
    }


    public  void callSocketServer(){

        try {
            IO.Options options = new IO.Options();
            options.transports = new String[]{ WebSocket.NAME};

            mSocket = IO.socket("wss://demo.piesocket.com/v3/channel_123?api_key=VCXCEuvhGcBDP7XhiJJUDvR1e1D3eiVjgZ9VRiaV&notify_self",options);

            mSocket.on(Socket.EVENT_CONNECT_ERROR, new Emitter.Listener() {
                @Override
                public void call(Object... args) {
                    System.out.println("Connection Error");
                }
            });
            mSocket.connect();

            mSocket.on(Socket.EVENT_CONNECT, new Emitter.Listener() {
                @Override
                public void call(Object... args) {

                    System.out.println("SocketServer: connected call back" + args[0].toString());
                    mSocket.emit("YOUR_TOPIC", "YOUR_DATA_VALUE");


                }
            });
        } catch (URISyntaxException e) {
            System.out.println("Exception is : " + e);
        }

    }
}

MainActivity:

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

       SocketServer.getInstance().callSocketServer();
    }
}

score 0 · Answer 1 · answered Oct 28 '22 at 16:04

0

Your problem is because of using socket.io library, you don't need socket.io.

In this link, the correct way to connect to ws protocol is mentioned

answered Oct 28 '22 at 16:04

Ali Azmoodeh

152
2
10

why cant we use socket.io ?? can you comment on that? – I'm Coder Oct 28 '22 at 16:43
your question was solved by this [answer](https://stackoverflow.com/a/60626303/14741947) – Ali Azmoodeh Oct 28 '22 at 17:08
So we don't have to use any library for communicating with ws and http protocol? – I'm Coder Oct 28 '22 at 17:47
The answer to this question depends on the project you are doing. ws is only a protocol for real-time connection. If you want to add other options to ws or you want to take responsibility for its security, you can not use it in socket.io event. These things are taken care of by yourself and you only need to use it. To use socket.io, you must use the libraries that are made by the manufacturer for the server and client side. – Ali Azmoodeh Oct 28 '22 at 18:22
I have used the official library from socket.io. does that support everything? https://socket.io/blog/native-socket-io-and-android/ – I'm Coder Oct 29 '22 at 18:33
What library is your server written with? – Ali Azmoodeh Oct 29 '22 at 18:50
@ Ali Azmoodeh - currently I'm having a window services. I have to send and recieve messages throught port , whic can be done through socket communication. – I'm Coder Oct 30 '22 at 01:41
So there is no need to use socket.io in this case – Ali Azmoodeh Oct 30 '22 at 06:29
can we implement it using socket .io also? Is that possible? – I'm Coder Oct 30 '22 at 07:09
You can use the socket.io library only if the server side is written with the socket.io library – Ali Azmoodeh Oct 30 '22 at 11:39
So the solution which you have posted ,will it work to send and receive messages to my windows services without thinking on what's written in windows services? – I'm Coder Oct 30 '22 at 11:59
Yes it is possible – Ali Azmoodeh Oct 30 '22 at 12:12
can you confirm if the this is the latest version for webSockerClient ` implementation "org.java-websocket:Java-WebSocket:1.3.9"` – I'm Coder Oct 30 '22 at 12:46
I have no idea how to fix your problem at the moment – Ali Azmoodeh Oct 30 '22 at 12:48
The solutions is working now. can you confirm the latest version for websocket for Android? – I'm Coder Oct 30 '22 at 12:50
Currently, I have not used the latest version, but there is no problem – Ali Azmoodeh Oct 30 '22 at 13:17
okay. Let me implement it and verify. – I'm Coder Oct 30 '22 at 13:24
I'm getting this error onCloseunknown scheme: http. – I'm Coder Oct 31 '22 at 09:08

Connection Error in Socket.io in Native Android

1 Answers1