a.js

window.onload = function () {
    // add eventListener for tizenhwkey
    document.addEventListener('tizenhwkey', function(e) {
    		if(e.keyName == "back")
			try {
			    //tizen.application.getCurrentApplication().exit();
			} catch (ignore) { }
    });
    
    function successcallback(device)
    {
    		document.getElementById('textbox').innerHTML = device.address+'<br/>'+device.rssi+' dBm';
    		
    		if (device.address in target_devices) {
    			console.log(device.address + " _ " + device.rssi);
    			if (device.rssi > -95)
	    			target_devices[device.address].push(device.rssi);
    		}
    };
    
	var adapter = tizen.bluetooth.getLEAdapter();
	adapter.startScan(successcallback);
	
	function makeTag(length) {
		var result           = '';
		var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
		var charactersLength = characters.length;
		for ( var i = 0; i < length; i++ ) {
			result += characters.charAt(Math.floor(Math.random() * charactersLength));
		}
		return result;
	}
	
	/* Open Tizen File System */
	var user_events = [];
	var fileName = "logs"
	var fileDir, logFile;
	var hasPermission = false;
	tizen.ppm.requestPermission("http://tizen.org/privilege/mediastorage", onsuccessPermission, null);
	function onsuccessPermission(){
		tizen.filesystem.resolve('documents', onResolveSuccess, null, 'rw');
	}
	
	function onResolveSuccess(dir) {
		hasPermission = true;
		fileDir = dir;
		try {
			fileDir.createFile(fileName);
		} catch (IOError) {
			console.log("File Already Exist");
		}
		
		try {
			logFile = fileDir.resolve(fileName);
			logFile.openStream('r', readFromStream, null, "UTF-8");
			function readFromStream(fileStream) {
				if (logFile.fileSize > 0){
					var text = fileStream.read(logFile.fileSize);
					var text_events = text.split(';');
					for (var j = 0; j < text_events.length - 1; j++){
						var eventFields = text_events[j].split(":");
						user_events.push({deviceId:cur_device.replace(/:/g, ""), locationId:3, tag:eventFields[0], timestamp:eventFields[1], content:eventFields[2]});
					}
					fileStream.close();
				}
			}
		} catch (exc) {
			hasPermission = false;
			return;
		}
	}
	
	function myMethod( )
	{
		Object.keys(target_devices).forEach(function(key) {
			console.log(key.replace(/:/g, "") + " - " + eval(target_devices[key].join('+'))/target_devices[key].length);
			if (eval(target_devices[key].join('+'))/target_devices[key].length > -80) // think about avg
				user_events.push({deviceId:cur_device.replace(/:/g, ""), locationId:3, tag:makeTag(10) + "_" + eval(target_devices[key].join('+'))/target_devices[key].length, timestamp:new Date().valueOf(), content:key.replace(/:/g, "")});
			target_devices[key] = [];
		});
		
		var temp_events = user_events;
		
		if (hasPermission){
			logFile.openStream('a', appendToStream, null, "UTF-8");
			function appendToStream(fileStream) {
				var es = "";
				try {
					for (var j = 0; j < temp_events.length; j++)
					{
						es += temp_events[j].tag + ":" + temp_events[j].timestamp + ":" + temp_events[j].content;
						es += ";";
					}
					fileStream.write(es);
					fileStream.close();
				} catch (exc) {
					console.log('Could not write to file: ' + exc.message);
				}
			}
		}

		if (user_events.length != 0)
		{
			var data = JSON.stringify({events : user_events, userHash : "010E-0F55-D634-76D6"}).replace(/\\\"/g, "");
	   	   	console.log(data);
	   	   	jQuery.ajax ({
			    url: 'https://api.stage.navigine.com/mobile/user-events/add',
			    type: "POST",
			    data: data,
			    dataType: "json",
			    contentType: "application/json",
			    success: function(){
			    		console.log('posted');
			    		user_events = [];
			    		if (hasPermission){
			    			logFile.openStream('w', clearStream, null, "UTF-8");
			    			function clearStream(fileStream) {
			    				try {
			    					fileStream.write("");
			    					fileStream.close();
			    				} catch (exc) {
			    					console.log('Could not clear file: ' + exc.message);
			    				}
			    			}
			    		}
			    },
			    error: function(error){
			    		console.log(error);
			    }
			});
		}
	}
	
	setInterval(myMethod, 30000);
    
};