Unable to establish connection between Node.JS and React-Native (Socket.IO) - ios

Question

I'm new to React and Node and i'm trying to make a simple WebSocket using Socket.IO which gonna simply send greetings to all connected users and the user will respond to the server.
The Node.JS server is running on a Windows PC while the React-Native app is running on both iOS and Android devices.
Node.JS server code is the following
var app = require('express')();
var http = require('http').createServer(app);
var io = require('socket.io')(http);
const bodyParser = require('body-parser');
const mysql = require('mysql');
const connection = mysql.createPool({
host : 'localhost',
user : 'root',
password : 'block',
database : 'visualpos'
});
// Creating a GET route that returns data from the 'users' table.
app.get('/prenotazioni', function (req, res) {
// Connecting to the database.
connection.getConnection(function (err, connection) {
// Executing the MySQL query (select all data from the 'users' table).
connection.query("SELECT Data, Importo_Doc FROM tabella_pagamenti", function (error, results, fields) {
// If some error occurs, we throw an error.
if (error) throw error;
// Getting the 'response' from the database and sending it to our route. This is were the data is.
res.send(results)
});
connection.release();
});
});
app.get('/', function(req, res){
res.send('<h1>Hello World</h1>');
});
// Starting our server.
http.listen(3000, () => {
console.log('In ascolto sulla porta *:3000');
});
io.emit('saluta', 'Ciao dal server :)');
io.on('connected', (data) => {
console.log(data);
});
Actually GET part of the code works perfectly but the Socket.IO seems death.
The client doesn't get any response and server the same i think the Socket.IO server simply doesn't start..
In XCode Debug i get the following errors when the app is running on the iPhone
And i even get on both devices warning "Unrecognized WebSocket connection option(s) 'agent', 'perMessageDeflate',..."
And here is the code i'm using in React-Native
import io from 'socket.io-client'
var socket = io('http://192.168.100.50:3000', {
jsonp: false,
transports: ['websocket'],
autoConnect: true,
reconnection: true,
reconnectionDelay: 500,
reconnectionAttempts: Infinity
});
componentDidMount(){
socket.emit('connected','we');
socket.on('saluta',(data) => { alert(data); });
}

Answer 1

On socket.io getStarted section, they use a "connection" event instead of "connected" (https://socket.io/get-started/chat/).
io.on('connection', function(socket){
console.log('a user connected');
socket.on('disconnect', function(){
console.log('user disconnected');
});
});