<script>
    var ws = new WebSocket('ws://localhost:40510');

    // event emmited when connected
    ws.onopen = function () {
        console.log('websocket is connected ...')

        // sending a send event to websocket server
        ws.send('connected')
    }

    // event emmited when receiving message 
    ws.onmessage = function (ev) {
        console.log(ev);
    }
</script>

var WebSocketServer = require('ws').Server,
  wss = new WebSocketServer({port: 40510})

wss.on('connection', function (ws) {
  ws.on('message', function (message) {
    console.log('received: %s', message)
  })

  setInterval(
    () => ws.send(`${new Date()}`),
    1000
  )
})