K6 Load testing Laravel Echo Server

gistfile1.js

import ws from 'k6/ws'
import { check } from 'k6'

export const options = {
  stages: [
    { duration: '30s', target: 100 },
    { duration: '2m', target: 1000 },
    { duration: '2m', target: 2000 },
    { duration: '2m', target: 3000 },
    { duration: '1m', target: 0 }
  ]
}

export default function () {
  const url = 'wss://websocket.kapadiya.net/socket.io/?EIO=4&transport=websocket'

  const response = ws.connect(url, {}, function (socket) {
    socket.on('open', function open () {
      console.log('connected')
      // socket.send(Date.now())

      socket.setInterval(function timeout () {
        socket.send('3')
      }, 10000)
    })

    socket.on('message', function incoming (msg) {
      if (msg && msg.startsWith('0{"sid')) {
        socket.send(
          '40/echo-app-key,{"headers":{}}'
        )
      }

      if (msg && msg.startsWith('40/echo-app-key,{"sid":"')) {
        socket.send(
          '42/echo-app-key,["subscribe",{"channel":"twitter","auth":{"headers":{}}}]'
        )
      }
    })

    socket.on('close', function close () {
      console.log('disconnected')
    })

    socket.on('error', function (e) {
      console.log('error', e)
      if (e.error() != 'websocket: close sent') {
        console.log('An unexpected error occured: ', e.error())
      }
    })
  })

  check(response, { 'status is 101': (r) => r && r.status === 101 })
}