michael@0: /*jslint node:true,vars:true, unparam:true */
michael@0: /*jshint unused:true */
michael@0: 
michael@0: 
michael@0: /*
michael@0: 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.
michael@0: 
michael@0: MRAA - Low Level Skeleton Library for Communication on GNU/Linux platforms
michael@0: 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.
michael@0: 
michael@0: Steps for installing MRAA & UPM Library on Intel IoT Platform with IoTDevKit Linux* image
michael@0: Using a ssh client: 
michael@0: 1. echo "src maa-upm http://iotdk.intel.com/repos/1.1/intelgalactic" > /etc/opkg/intel-iotdk.conf
michael@0: 2. opkg update
michael@0: 3. opkg upgrade
michael@0: 
michael@0: Article: https://software.intel.com/en-us/html5/articles/iot-touch-notifier-nodejs-and-html5-samples
michael@0: */
michael@0: 
michael@0: //MRAA Library was installed on the board directly through ssh session
michael@0: var mraa = require("mraa");
michael@0: var mqtt = require("mqtt");
michael@0: var http = require("http");
michael@0: 
michael@0: function setOpenhabState(txtNewState) {
michael@0:     http.get("http://192.168.42.245:8080/CMD?door_bell="+txtNewState);
michael@0: }
michael@0: 
michael@0: //GROVE Kit Shield D6 --> GPIO6
michael@0: //GROVE Kit Shield D2 --> GPIO2
michael@0: function startSensorWatch(socket) {
michael@0:     'use strict';
michael@0:     var touch_sensor_value = 0, last_t_sensor_value;
michael@0:     var mqtcli = mqtt.connect('mqtt://raspeinz.local/');
michael@0: 
michael@0:     //Touch Sensor connected to D2 connector
michael@0:     var digital_pin_D2 = new mraa.Gpio(2);
michael@0:     digital_pin_D2.dir(mraa.DIR_IN);
michael@0: 
michael@0:     //Buzzer connected to D6 connector
michael@0:     var digital_pin_D6 = new mraa.Gpio(6);
michael@0:     digital_pin_D6.dir(mraa.DIR_OUT);
michael@0: 
michael@0:     digital_pin_D6.write(0);
michael@0: 
michael@0:     setInterval(function () {
michael@0:         touch_sensor_value = digital_pin_D2.read();
michael@0:         if (touch_sensor_value === 1 && last_t_sensor_value === 0) {
michael@0:             console.log("Buzz ON!!!");
michael@0:             socket.emit('message', "present");
michael@0:             mqtcli.publish('door', 'ding');
michael@0:             //mqtcli.end(); // end connection
michael@0: // FUR ULRICH!            //http.get("http://ulno.local:8080/CMD?door_bell=ON");
michael@0:             digital_pin_D6.write(touch_sensor_value);
michael@0:         } else if (touch_sensor_value === 0 && last_t_sensor_value === 1) {
michael@0:             console.log("Buzz OFF!!!");
michael@0:             //socket.emit('message', "absent");
michael@0:             mqtcli.publish('door', 'dong');
michael@0: // FUR ULRICH!            //http.get("http://ulno.local:8080/CMD?door_bell=OFF");
michael@0:             digital_pin_D6.write(touch_sensor_value);
michael@0:         }
michael@0:         last_t_sensor_value = touch_sensor_value;
michael@0:     }, 500);
michael@0: }
michael@0: 
michael@0: //Create Socket.io server
michael@0: //var http = require('http'); // See top requires
michael@0: var app = http.createServer(function (req, res) {
michael@0:     'use strict';
michael@0:     res.writeHead(200, {'Content-Type': 'text/plain'});
michael@0:     res.end('<h1>Hello world from Intel IoT platform!</h1>');
michael@0: }).listen(1338);
michael@0: var io = require('socket.io')(app);
michael@0: 
michael@0: console.log("Sample Reading Touch Sensor");
michael@0: 
michael@0: //Attach a 'connection' event handler to the server
michael@0: io.on('connection', function (socket) {
michael@0:     'use strict';
michael@0:     console.log('a user connected');
michael@0:     //Emits an event along with a message
michael@0:     socket.emit('connected', 'Welcome');
michael@0: 
michael@0:     //Start watching Sensors connected to Galileo board
michael@0:     startSensorWatch(socket);
michael@0: 
michael@0:     //Attach a 'disconnect' event handler to the socket
michael@0:     socket.on('disconnect', function () {
michael@0:         console.log('user disconnected');
michael@0:     });
michael@0: });