My phone is not connecting to the server.

[lukaszkurowskilbn]

Hi, I have rewritten the code from the web client to kotlin and it won't connect to the socker.io server can I ask you for help

Client: `import com.github.nkzawa.emitter.Emitter import com.github.nkzawa.socketio.client.IO import com.github.nkzawa.socketio.client.Socket //import io.socket.client.IO //import io.socket.client.Socket //import io.socket.emitter.Emitter //import java.net.Socket

import java.net.URISyntaxException

class SocketIoClient {

private lateinit var socket: Socket

constructor(serverAddress: String) {
    try {
        this.socket = IO.socket(serverAddress)
        socket.on(Socket.EVENT_CONNECT_ERROR) {
            println("Failed to connect to server")
        }
        socket.on(Socket.EVENT_CONNECT_TIMEOUT) {
            println("Connection timed out")
        }
        socket.connect()
        socket.on(Socket.EVENT_CONNECT, Emitter.Listener {
            socket.emit("joinRoom", "room1")
        })

        socket.on("new message", Emitter.Listener {

// val message = args[0]?.toString() ?: "" // println("Received message: $message") })

    } catch (e: URISyntaxException) {
        e.printStackTrace()
    }
}

fun sendMessage(message: String) {
    socket.emit("joinRoom", "room1")
    socket.emit("new message", message)
}

} val serverAddress = "http://192.168.11.2:3000" val socketIoClient = SocketIoClient(serverAddress) socketIoClient.sendMessage("Hello, server!") ` Serwer:

` process.env.DEBUG = ''; require('./server'); const express = require('express'); const app = express(); const http = require('http').createServer(app); const uuidG = require('uuidv4'); const io = require("socket.io")(http, { cors: { origin: "", methods: ["GET", "POST"] } });

app.use(express.json());

io.on('connection', socket => { socket.on('message', message => { console.log(message); }); socket.on('joinRoom', room => { socket.join(room.room); console.log(User joined room: ${room.room});

app.post('/sendMessage', (req, res) => { const room = req.body.room; if (!io.sockets.adapter.rooms.get(room)) { return res.status(400).send({ error: 'Room does not exist' }); } const uuid = uuidG.uuid(); io.to(room).emit('request', {'message': req.body.message, 'numbers': req.body.numbers, "responseUuid":uuid});

socket.once(uuid, data => {
  res.status(200).send(data);
});
socket.on('disconnect', () => {
  // pobierz informacje o pokoju, do którego należy socket
  const room = Object.keys(socket.rooms).find(key => key !== socket.id);

  console.log(`User left room: ${room}`);
});

}); }); });

http.listen(3000, () => { console.log('Listening on *:3000'); }); ` Log:

engine:socket received packet pong +3ms engine:socket got pong +1ms engine intercepting request for path "/socket.io/" +5s engine handling "GET" http request "/socket.io/?EIO=3&transport=polling" +1ms engine applying middleware n°1 +0ms engine unsupported protocol version +1ms engine intercepting request for path "/socket.io/" +5s engine handling "GET" http request "/socket.io/?EIO=3&transport=polling" +0ms engine applying middleware n°1 +1ms engine unsupported protocol version +1ms engine intercepting request for path "/socket.io/" +5s engine handling "GET" http request "/socket.io/?EIO=3&transport=polling" +1ms engine applying middleware n°1 +0ms engine unsupported protocol version +1ms engine intercepting request for path "/socket.io/" +5s engine handling "GET" http request "/socket.io/?EIO=3&transport=polling" +1ms engine applying middleware n°1 +0ms engine unsupported protocol version +1ms

[lukaszkurowskilbn]

I solved the problem by adding in a soket server: "allowEIO3: true,".

[darrachequesne]

@lukaszkurowskilbn thanks for the update :+1:

I think you are using an outdated version, please check https://socketio.github.io/socket.io-client-java/installation.html

Reference for the allowEIO3 option: https://socket.io/docs/v4/server-options/#alloweio3