app.js

var app = require('http').createServer(handler)
var io = require('socket.io')(app)
var url = require('url')
var fs = require('fs')


//This will open a server at localhost:5000. Navigate to this in your browser.
app.listen(5000);

// Http handler function
function handler (req, res) {

    // Using URL to parse the requested URL
    var path = url.parse(req.url).pathname;

    // Managing the root route
    if (path == '/') {
        index = fs.readFile(__dirname+'/public/index.html', 
            function(error,data) {

                if (error) {
                    res.writeHead(500);
                    return res.end("Error: unable to load index.html");
                }

                res.writeHead(200,{'Content-Type': 'text/html'});
                res.end(data);
            });
    // Managing the route for the javascript files
    } else if( /\.(js)$/.test(path) ) {
        index = fs.readFile(__dirname+'/public'+path, 
            function(error,data) {

                if (error) {
                    res.writeHead(500);
                    return res.end("Error: unable to load " + path);
                }

                res.writeHead(200,{'Content-Type': 'text/plain'});
                res.end(data);
            });
    } else {
        res.writeHead(404);
        res.end("Error: 404 - File not found.");
    }

}

// Web Socket Connection
io.sockets.on('connection', function (socket) {

  // If we recieved a command from a client to start watering lets do so
  socket.on('example-ping', function(data) {
      console.log("ping");

      delay = data["duration"];

      // Set a timer for when we should stop watering
      setTimeout(function(){
          socket.emit("example-pong");
      }, delay*1000);

  });
  
});