Publish Hexiwear sensor data onto ARTIK with Evothings

// Using closure to avoid global name space conflicts.
;(() =>
{
'use strict';

// Timeinterval between acceleration fetch. 
const ACCELERATION_SAMPLE_PERIOD = 200; 
const MOTION_SERVICE_UUID = '2000';
const ACCELERATION_CHARACTERISTIC_UUID = '2001';

var Client = require("node-rest-client").Client;

// Application object
var app = {};

// Name of the device the application will try to connect to. 
app.deviceName = 'ChangeMe!!';

// The BLE GATT server.
app.gattServer = null;

// BLE objects
app.motionService = null;
app.accelerationCharacteristic = null;
app.accelerationSamples = []; 

// artik cloud node-rest-client functions
app.artikcloud = "https://api.artik.cloud/v1.1/messages";
app.bearer = "Bearer device-token";
app.sdid = "device-id";

app.c = new Client();

app.build_args = function(ax, ay, az, ts) {

	var args = {
		headers: {
			"Content-Type": "application/json",
			"Authorization": app.bearer 
		},  
		data: { 
    		"sdid": app.sdid,
			"ts": ts,
			"type": "message",
			"data": {
				"x": ax,
				"y": ay,
				"z": az
   			}
		}
	};
	return args;
};
// end artik cloud functions


// Initialise the application.
app.initialize = function() {

	document.addEventListener(
		'deviceready',
		app.onDeviceReady,
		false);
};

// When low level initialization is complete, this function is called.
app.onDeviceReady = function() {

	// Report status.
	app.showInfo('Enter BLE device name and tap Connect');

	// Show the saved device name, if any.
	var name = localStorage.getItem('deviceName');
	if (name) {

		app.deviceName = name;
	}
	$('#deviceName').val(app.deviceName);

	// Register callback for connectButton
	$('#connectButton').click(app.onConnectButton);	
};

// Executed when the Connect/Disconnect button is pressed. 
app.onConnectButton = function() {
	
	if(app.gattServer) {
		
		app.disconnect();
	}
	else {

		app.connect();
	}
};

// Try to connect the smartphone to the GATT server.
app.connect = function() {

	// Get device name from text field.
	app.deviceName = $('#deviceName').val();

	// Save it for next time we use the app.
	localStorage.setItem('deviceName', app.deviceName);

	// Disconnect if connected.
	if (app.gattServer && app.gattServer.connected)
	{
		app.gattServer.disconnect();
		app.gattServer = null;
	}

	app.showInfo('Status: Scanning...');

	// Find and connect to device and get characteristics for LED read/write.
	bleat.requestDevice({

		filters:[{ name: app.deviceName }]
	})
	.then(device => {

		app.showInfo('Status: Found device: ' + device.name);

		// Connect to device.
		return device.gatt.connect();
	})
	.then(server => {

		app.showInfo('Status: Connected');
		
		// Save gatt server.
		app.gattServer = server;

		$('#connectButton').html('Disconnect').attr('class', 'red');

		app.timer = setInterval(function() {

			app.gattServer.getPrimaryService(MOTION_SERVICE_UUID).then(service => {
				
				app.motionService = service;
				
				return app.motionService.getCharacteristic(ACCELERATION_CHARACTERISTIC_UUID);
			})
			.then(characteristic => {

				app.accelerationCharacteristic = characteristic;
				
				return app.accelerationCharacteristic.readValue(); 
			})
			.then(accelerationBuffer => {

				// Parse acceleration variables. 
				var ax = accelerationBuffer.getInt16(0, true) / 100.0;
				var ay = accelerationBuffer.getInt16(2, true) / 100.0;
				var az = accelerationBuffer.getInt16(4, true) / 100.0;

				app.drawDiagram({ x: ax, y: ay, z: az });
				
				var args = app.build_args(ax, ay, az, new Date().valueOf());

				app.c.post(app.artikcloud, args, function(data, response) {            
					console.log(data);
				});

			})
			.catch(error => {

				app.showInfo(error);
			});

		}, ACCELERATION_SAMPLE_PERIOD);


	})
	.catch(error => {

		app.showInfo(error);
	});
};

// Disconnect smartphone from the GATT server.
app.disconnect = function() {

	// Disconnect from GATT server
	app.gattServer.disconnect();
	app.gattServer = null; 
	clearInterval(app.timer);

	// Update UI 
	app.clearDiagram();
	app.showInfo('Status: Disconnected');
	$('#connectButton').html('Connect').attr('class', 'blue');
};


// Print debug info to console and application UI.
app.showInfo = function(info) {

	document.getElementById('info').innerHTML = info;
	console.log(info);
};

app.clearDiagram = function() {

	var canvas = document.getElementById('canvas');
	var context = canvas.getContext('2d');

	// Clear diagram canvas.
	context.clearRect(0, 0, canvas.width, canvas.height);
	
	// Remove samples from array.
	app.accelerationSamples.length = 0;
};

// Draw diagram to canvas. 
app.drawDiagram = function(values) {

	var canvas = document.getElementById('canvas');
	var context = canvas.getContext('2d');

	// Add recent values.
	app.accelerationSamples.push(values);

	// Remove data points that do not fit the canvas.
	if (app.accelerationSamples.length > canvas.width) {

		app.accelerationSamples.splice(0, (app.accelerationSamples.length - canvas.width));
	}

	// Value is an accelerometer reading between -1 and 1.
	function calcDiagramY(value){

		// Return Y coordinate for this value.
		var diagramY = ((value * canvas.height) / 8) + (canvas.height / 2);
		return diagramY;
	}

	function drawLine(axis, color) {

		context.strokeStyle = color;
		context.beginPath();
		var lastDiagramY = calcDiagramY(
			app.accelerationSamples[app.accelerationSamples.length-1][axis]);
		context.moveTo(0, lastDiagramY);
		var x = 1;
		for (var i = app.accelerationSamples.length - 2; i >= 0; i--)
		{
			var y = calcDiagramY(app.accelerationSamples[i][axis]);
			context.lineTo(x, y);
			x++;
		}
		context.stroke();
	}

	// Clear background.
	context.clearRect(0, 0, canvas.width, canvas.height);

	// Draw lines.
	drawLine('x', '#f00');
	drawLine('y', '#0f0');
	drawLine('z', '#00f');
};

// Initialize the app.
app.initialize();

})();