How to use socket.io-client to keep retrying for server or connect to a different server

client.coffee

client = require 'socket.io-client'
socket = null
host = "http://localhost:12345"
connect_client = () ->

  console.log('connecting')
  socket = client.connect(host, {'force new connection': true})

  socket.on('connect', ()->
    console.log('connected')
  )

  socket.on('error', (err)->
    reconnect()
  )
  
connect_client()

reconnect = () ->
  # optionally change host here
  socket.removeAllListeners() if socket
  setTimeout(go, 1000)

server.coffee

require 'socket.io'

socketio = require('socket.io').listen(12345, {'log':false})

socketio.on('connection', (socket)->
    console.log('hello')
)