can not connect to the engine.io-server-java v1.0.3 using the engine.io-client v3.0.4

[mostekp]

The engine.io-client v3.0.4 does not work with the latest version (1.0.3) of the engine.io-server-java.
There is following sentence in the migration notes from 2.x to 3.x:

"due to several breaking changes, a v2 client will not be able to connect to a v3 server (and vice versa)"
https://socket.io/docs/v3/migrating-from-2-x-to-3-0/index.html

So it looks like engine.io-server-java v1.0.3 in not a v3 server - is there a plan for the upgrade ?

Steps to reproduce:

1. Below is my client script - in this script I'm using engine.io-client v3.0.4
2. In the backend I'm using a copy of the io.socket.socketio.server.ServerWrapper from the socket.io-server-test
   Connection is never established - process always exit with code 1.

var io = require('socket.io-client');
var port = process.env.PORT || 3000;

console.log('socket.io port='+port);
var socket = io('http://127.0.0.1:' + port, {
autoConnect: false,
transports: ['websocket']
});
socket.on('connect', function () {
console.log('socket.io connected...')
process.exit(0);
});

socket.on('error', function (err) {
console.log('socket.io error', err);
process.exit(1);
});
socket.connect();

setTimeout(function () {
console.log('socket.io timeout...')
process.exit(1);
}, 20000);

[mostekp]

I want to add that everything works fine when I downgrade the engine.io-client from v3.0.4 to v2.3.1

[trinopoty]

v3 is a protocol upgrade. I'm working on the changes to get the java server compatible with v3 protocol.
Expect a new version soon.

[trinopoty]

I've been sitting on this for a while now. Mostly because I'm lazy.
Updated version of socket.io and engine.io are now published and should be available on maven in a few hours.