Websocket API question

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Volumio Information

Volumio Version: v2.861
Hardware: Raspberry Pi
DAC: Hifiberry DAC+

Hi,
I’m trying to connect the Websocket API from nodejs.
I have code working using the socket.io-client@2.4.0, but the same code fails using the latest socket-io-client@3.1.0 with an error Error: server error, code: 'parser error' and I cannot find what’s wrong with my code.

const io = require('socket.io-client');
const socket = io('http://192.168.6.10:3000');
socket.on('connect_error', err => { 
  console.log('Connect error to volumio', err);
});
socket.on('connect', () => { 
  console.log('Connected to volumio');
});
socket.on('pushState', data => { 
  console.log('pushState', data);
});

Can you provide any help for getting this running with socket.io-client@3.1.0?

Regards
sthones