old_contents: // modules 
  import express from 'express'
  import BodyParser from 'body-parser'
  import http from 'http'
  import _ from 'underscore'
  
  // routes
  // import index from './routes/index'
  
  import rpio from 'rpio'
  
  const pins = {
  	'drive': {
  		'forward': 11,
  		'backward': 13,
  		'left': 12,
  		'right': 18
  	}
  }
  
  // set gpio pins as output
  // left/right
  rpio.open(12, rpio.OUTPUT, rpio.LOW)
  rpio.open(18, rpio.OUTPUT, rpio.LOW)
  
  // forward/backward
  rpio.open(11, rpio.OUTPUT, rpio.LOW)
  rpio.open(13, rpio.OUTPUT, rpio.LOW)
  
  rpio.open(7, rpio.OUTPUT, rpio.HIGH)
  rpio.open(11, rpio.OUTPUT, rpio.HIGH)
  rpio.open(13, rpio.OUTPUT, rpio.LOW)
  rpio.open(15, rpio.OUTPUT, rpio.LOW)
  
  setInterval(function () {
  	var $swap = 0;
  
  	if (swap == 0) {
  		rpio.write(13, rpio.HIGH)
  		rpio.write(15, rpio.LOW)
  		$swap++
  	} else {
  		rpio.write(13, rpio.LOW)
  		rpio.write(15, rpio.HIGH)
  		$swap = 0
  	}
  
  }, 2000)
  
  
  // sockets
  import socketio from 'socket.io'
  
  const app = express()
  
  app.use(BodyParser.json())
  
  //enable cors
  app.all('*', function(req, res, next) {
    res.header('Access-Control-Allow-Origin', '*')
    res.header('Access-Control-Allow-Methods', 'PUT, GET, POST, DELETE, OPTIONS')
    res.header('Access-Control-Allow-Headers', 'Content-Type')
    next()
  })
  
  app.use('/public', express.static(__dirname + '/public'))
  
  // app.use('/', index);
  
  //setup io
  var server = http.createServer(app)
  
  var sio = socketio(server)
  
  // io.on('connection', socketioJwt.authorize({
  // 	secret: db.secret,
  // 	handshae: true
  // }))
  sio.on('connection', function (socket) {
  	/*
  		data:
  			direction (up, down, left, right)
  			speed (1, 0)
  	 */
  	socket.on('drive', function (data) {
  		if (!process.env.production) {
  			console.log(data)
  		}
  		const speed = (data['speed']) ? rpio.HIGH : rpio.LOW
  		const pin = pins.drive[data['direction']]
  
  		console.log(pin);
  		console.log(speed);
  
  		rpio.write(pin, speed)
  	})
  
  	setInterval(function () {
  		socket.emit('helloworld', 'hello world')
  	}, 2000)
  })
  
  server.listen(3000, function () {
  	console.log('app is listening on port 3000')
  })
  
  export default app
  
new_contents: // modules 
  import express from 'express'
  import BodyParser from 'body-parser'
  import http from 'http'
  import _ from 'underscore'
  
  // routes
  // import index from './routes/index'
  
  import rpio from 'rpio'
  
  const pins = {
  	'drive': {
  		'forward': 11,
  		'backward': 13,
  		'left': 12,
  		'right': 18
  	}
  }
  
  // set gpio pins as output
  // left/right
  rpio.open(12, rpio.OUTPUT, rpio.LOW)
  rpio.open(18, rpio.OUTPUT, rpio.LOW)
  
  // forward/backward
  rpio.open(11, rpio.OUTPUT, rpio.LOW)
  rpio.open(13, rpio.OUTPUT, rpio.LOW)
  
  rpio.open(7, rpio.OUTPUT, rpio.HIGH)
  rpio.open(11, rpio.OUTPUT, rpio.HIGH)
  rpio.open(13, rpio.OUTPUT, rpio.LOW)
  rpio.open(15, rpio.OUTPUT, rpio.LOW)
  
  setInterval(function () {
  	var $swap = 0;
  
  	if ($swap == 0) {
  		rpio.write(13, rpio.HIGH)
  		rpio.write(15, rpio.LOW)
  		$swap++
  	} else {
  		rpio.write(13, rpio.LOW)
  		rpio.write(15, rpio.HIGH)
  		$swap = 0
  	}
  
  }, 2000)
  
  
  // sockets
  import socketio from 'socket.io'
  
  const app = express()
  
  app.use(BodyParser.json())
  
  //enable cors
  app.all('*', function(req, res, next) {
    res.header('Access-Control-Allow-Origin', '*')
    res.header('Access-Control-Allow-Methods', 'PUT, GET, POST, DELETE, OPTIONS')
    res.header('Access-Control-Allow-Headers', 'Content-Type')
    next()
  })
  
  app.use('/public', express.static(__dirname + '/public'))
  
  // app.use('/', index);
  
  //setup io
  var server = http.createServer(app)
  
  var sio = socketio(server)
  
  // io.on('connection', socketioJwt.authorize({
  // 	secret: db.secret,
  // 	handshae: true
  // }))
  sio.on('connection', function (socket) {
  	/*
  		data:
  			direction (up, down, left, right)
  			speed (1, 0)
  	 */
  	socket.on('drive', function (data) {
  		if (!process.env.production) {
  			console.log(data)
  		}
  		const speed = (data['speed']) ? rpio.HIGH : rpio.LOW
  		const pin = pins.drive[data['direction']]
  
  		console.log(pin);
  		console.log(speed);
  
  		rpio.write(pin, speed)
  	})
  
  	setInterval(function () {
  		socket.emit('helloworld', 'hello world')
  	}, 2000)
  })
  
  server.listen(3000, function () {
  	console.log('app is listening on port 3000')
  })
  
  export default app
  
subject: fix typo