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 /*jslint node:true,vars:true, unparam:true */

 /*jshint unused:true */

 /*

 The Touch Notifier Node.js sample application distributed within Intel® XDK IoT Edition under the IoT with Node.js Projects project creation option showcases how to read digital data from a Grover Starter Kit Plus – IoT Intel® Edition Touch Sensor, start a web server and communicate wirelessly using WebSockets.

 MRAA - Low Level Skeleton Library for Communication on GNU/Linux platforms

 Library in C/C++ to interface with Galileo & other Intel platforms, in a structured and sane API with port nanmes/numbering that match boards & with bindings to javascript & python.

 Steps for installing MRAA & UPM Library on Intel IoT Platform with IoTDevKit Linux* image

 Using a ssh client: 

 1. echo "src maa-upm http://iotdk.intel.com/repos/1.1/intelgalactic" > /etc/opkg/intel-iotdk.conf

 2. opkg update

 3. opkg upgrade

 Article: https://software.intel.com/en-us/html5/articles/iot-touch-notifier-nodejs-and-html5-samples

 */

 //MRAA Library was installed on the board directly through ssh session

 var mraa = require("mraa");

 var mqtt = require("mqtt");

 var http = require("http");

 function setOpenhabState(txtNewState) {

     http.get("http://192.168.42.245:8080/CMD?door_bell="+txtNewState);

 }

 //GROVE Kit Shield D6 --> GPIO6

 //GROVE Kit Shield D2 --> GPIO2

 function startSensorWatch(socket) {

     'use strict';

     var touch_sensor_value = 0, last_t_sensor_value;

     var mqtcli = mqtt.connect('mqtt://raspeinz.local/');

     //Touch Sensor connected to D2 connector

     var digital_pin_D2 = new mraa.Gpio(2);

     digital_pin_D2.dir(mraa.DIR_IN);

     //Buzzer connected to D6 connector

     var digital_pin_D6 = new mraa.Gpio(6);

     digital_pin_D6.dir(mraa.DIR_OUT);

     digital_pin_D6.write(0);

     setInterval(function () {

         touch_sensor_value = digital_pin_D2.read();

         if (touch_sensor_value === 1 && last_t_sensor_value === 0) {

             console.log("Buzz ON!!!");

             socket.emit('message', "present");

             mqtcli.publish('door', 'ding');

             //mqtcli.end(); // end connection

 // FUR ULRICH!            //http.get("http://ulno.local:8080/CMD?door_bell=ON");

             digital_pin_D6.write(touch_sensor_value);

         } else if (touch_sensor_value === 0 && last_t_sensor_value === 1) {

             console.log("Buzz OFF!!!");

             //socket.emit('message', "absent");

             mqtcli.publish('door', 'dong');

 // FUR ULRICH!            //http.get("http://ulno.local:8080/CMD?door_bell=OFF");

             digital_pin_D6.write(touch_sensor_value);

         }

         last_t_sensor_value = touch_sensor_value;

     }, 500);

 }

 //Create Socket.io server

 //var http = require('http'); // See top requires

 var app = http.createServer(function (req, res) {

     'use strict';

     res.writeHead(200, {'Content-Type': 'text/plain'});

     res.end('<h1>Hello world from Intel IoT platform!</h1>');

 }).listen(1338);

 var io = require('socket.io')(app);

 console.log("Sample Reading Touch Sensor");

 //Attach a 'connection' event handler to the server

 io.on('connection', function (socket) {

     'use strict';

     console.log('a user connected');

     //Emits an event along with a message

     socket.emit('connected', 'Welcome');

     //Start watching Sensors connected to Galileo board

     startSensorWatch(socket);

     //Attach a 'disconnect' event handler to the socket

     socket.on('disconnect', function () {

         console.log('user disconnected');

     });

 });