app.js

/*
Social Clinic
for Conversation and Computation Class in ITP
2015 May
with Oryan Inbar&Ava Huang*Chang Liu

The following NodeJS script can be run
on a Lapatop with an Arduino connected serially,
or it can be run on a Yun with Bridge disabled.

*/

// our super simple HTTP server, using native NodeJS modules
//use HTTP modules inside NodeJS
//don't need to remember, just copy and paste
//Node Server---------------------------------------------------------------------------------------------
var http = require('http');
var fs = require('fs');

// create the HTTP server to serve the file
var my_HTTPServer = http.createServer(function(request,response){

	if(request.url==='/') request.url = '/index.html';

	// when a browser sends a request, go get the index page, and respond with it
	fs.readFile(__dirname+request.url,function(error,my_HTML){

		// if there's an error reading the index page, send the error instead
		if(error){
			my_HTML = JSON.stringify(error);
		}
		response.writeHead(200, {"Content-Type": "text/html"});
		response.write(my_HTML);
		response.end();
	});
});

// every server must listen on a port
//if you listen to 8000, it come up with index.html
my_HTTPServer.listen(8000);
//console.log('HTTP server started on port 8000');

//end of deal with HTTP server stuff


//::websocket::----------------------------------------------------------------------------------------------

//all the interactive fun stuff btw browser and arudino going on here
// load the websocket module
var WebSocketServer = require('ws').Server;

// have it listening along with our HTTP server
var my_WebSocketServer = new WebSocketServer({
	'server':my_HTTPServer
});

// global variable for out browser's socket connection
var browserSocket = undefined;

// event fires when the browser connects to this server
//::multiple user sametime use it::
//1.change all the browserSocket to browserSockets
//2.browserSockets = [];
//3.browserSockets.push(newsocket);
//::
my_WebSocketServer.on('connection',function(newSocket){

	browserSocket = newSocket; // save the socket to be global

	// this event fires when a message from the browser arrives
	browserSocket.on('message',function(data){
		// if(myPort && myPort.isOpen){
		// 	//correspond with index.html"msg.data; function(msg)"
		// 	myPort.write(msg);
		// }

		data = JSON.parse(data);

		if(data!==undefined) {
			//myPort.write(data); // it sends the score as ascii, it's tricky for arduino to deal with long string
            // send a comma separated list of values
            // printReceipt(2,54,"andy","tired","ryan");

			// number
			// age
			// name
			// symptom
			// doctor
            
            //it is very important part to use this structure to deal with sending string from webpage to arduino
            //because arduino is not welcome to long string
			var tempString = '';
			tempString += data.name;
			tempString += ',';
			// tempString += data.number;
			// tempString += ',';
			// tempString += data.name;
			// tempString += ',';
			// tempString += data.symptom;
			// tempString += ',';
			// tempString += data.doctor;
			tempString += '\n';

			console.log(tempString);

			myPort.write(tempString);
		}
	});

	// this event fires when the connection is closed
	browserSocket.on('close',function(){
		browserSocket = undefined; // erase the socket from the global variable
	});
});

//::websocket::----------------------------------------------------------------------------------------

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//below code is similar with processing
//ws 

var serialport = require('serialport');
var Port = serialport.SerialPort;

//var myPortName = '/dev/ttyATH0'; // for my YUN (the same for everyone)
//var myPortName = '/dev/tty.usbmodem1421'; // for easy to switch to different USB
var myPortName = '/dev/cu.usbmodem1411'; // for my laptop (different for everyone)

var myPort = undefined;

//list your port
// .list doesn't work on the Yun :(
// serialport.list(function(error,ports){
// 	for(var i=0;i<ports.length;i++){
// 		console.log(ports[i].comName);
// 	}
// });

// create the port
var myPort = new Port(myPortName,{
	'baudrate':9600, // the Arduino's baud rate
	'parser': serialport.parsers.readline('\r\n') // arduino ends messages with .println()
});

// this event fires when the serial port opens
myPort.on('open',function(){
	console.log('serial port is OPEN');
	myPort.isOpen = true; // our own little variable, to tell us the port opened
});

// this event fires when we get data from the arduino
myPort.on('data',function(data){

	// if we have a socket connection, send the message
	if(browserSocket){
		browserSocket.send(data);
	}
	// else, just print it out so we can see it
	else{
		console.log(data);
	}
});

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