I have a website that is connected to NodeJS server via socket.io. When I
open that website on different computer, only one or two of these devices
would be able to send messages to the server. Help would be appreciated. I
think there's something wrong with the way I implemented how the server
handles package, but I can't figure out what.
*This is how I set up the socket.io part:*
var http = require('http')
, net = require('net')
, url = require('url')
, fs = require('fs')
, io = require('socket.io')
, sys = require(process.binding('natives').util ? 'util' : 'sys')
, server;
var tcpGuests = [];
var chatGuests = [];
// create http server with the website
server = http.createServer(function(req, res){
// your normal server code
var path = url.parse(req.url).pathname;
switch (path){
case '/':
res.writeHead(200, {'Content-Type': 'text/html'});
res.write('<h1>Welcome. Try the <a href="/arduino.html">Arduino</a>
example.</h1>');
res.end();
break;
case '/json.js':
case '/arduino.html':
fs.readFile(__dirname + path, function(err, data){
if (err) return send404(res);
res.writeHead(200, {'Content-Type': path == 'json.js' ?
'text/javascript' : 'text/html'})
res.write(data, 'utf8');
res.end();
});
break;
default: send404(res);
}
}),
send404 = function(res){
res.writeHead(404);
res.write('404');
res.end();
};
//var app = connect().use(connect.static('public')).listen(8090, "0.0.0.0");
server.listen(8090, "0.0.0.0");
//server.listen(app);
// socket.io
var io = io.listen(server)
, buffer = [];
io.on('connection', function(client){
client.send({ buffer: buffer });
client.broadcast.send({ announcement: client.sessionId + ' connected' });
chatGuests.push(client);
client.on('message', function(message){
var msg = { message: [client.sessionId, message] };
buffer.push(msg);
if (buffer.length > 15) buffer.shift();
client.broadcast.send(msg);
//send msg to tcp connections
for (g in tcpGuests) {
tcpGuests[g].write(message);
}
});
client.on('disconnect', function(){
client.broadcast.send({ announcement: client.sessionId + '
disconnected' });
});
});
*This is the base of the website (which has a button that sends a package
to Node.js server):*
<!doctype html>
<html>
<head>
<title>socket.io client test</title>
<!-- packet for socket io and JQuery-->
<script src="/json.js"></script>
<script src="/socket.io/socket.io.js"></script>
<script
src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js";></script>
</head>
<body>
<script>
// change button color and indicates who is pressing on button
function message(obj){
var el = document.createElement('p');
if ('announcement' in obj) el.innerHTML = '<em>' +
esc(obj.announcement) + '</em>';
else if ('message' in obj) el.innerHTML = '<b>' +
esc(obj.message[0]) + ':</b> ' + esc(obj.message[1]);
if (obj.message[0] == "you" && obj.message[1] == "1") {
jQuery('#button').css('background-color','green');
} else if (obj.message[0] != "arduino" && obj.message[0] != "you"
&& obj.message[1] == "1") {
jQuery('#button').css('background-color','yellow');
} else if (obj.message[1] == "0") {
jQuery('#button').css('background-color','white');
}
if( obj.message && window.console && console.log )
console.log(obj.message[0], obj.message[1]);
}
function turnOn() {
socket.send('1');
message({ message: ['you', '1'] });
}
function turnOff() {
socket.send('0');
message({ message: ['you', '0'] });
}
function esc(msg){
return msg.replace(/</g, '<').replace(/>/g, '>');
};
* // establish socket connection via port 8090*
* //var socket = new io.connect(null, { port: 8090, rememberTransport:
false});*
* var socket = io.connect('98.174.142.4:8090');*
* socket.on('message', function(obj){*
* if ('buffer' in obj){*
* //ignore this*
* } else message(obj);*
* });*
* socket.on('connect', function(){ message({ message: ['System',
'Connected']})});*
* socket.on('disconnect', function(){ message({ message: ['System',
'Disconnected']})});*
* socket.on('reconnect', function(){ message({ message: ['System',
'Reconnected to server']})});*
* socket.on('reconnecting', function( nextRetry ){ message({ message:
['System', 'Attempting to re-connect to the server, next attempt in ' +
nextRetry + 'ms']})});*
* socket.on('reconnect_failed', function(){ message({ message:
['System', 'Reconnected to server FAILED.']})});*
var logged = false;
// when mouse down; turn on.
jQuery('document').ready(function(){
jQuery('#button').mousedown(function() {
logged = !logged;
if( logged == true)
{
turnOn();
}else
{
turnOff();
}
});
})
</script>
<div id='button'>
<br/><Br/>
Tap to turn LED my on.
<br/><br/>
Release to turn LED off.
<p>
<span id="greenLegend">Green</span> => You are blinking it.<br/>
<span id="yellowLegend">Yellow</span> => Someone else is
blinking it
<p>
</div>
<style>
body {
width:960px;
height:320px;
}
#button {
border:2px solid black;
padding:12px;
text-align:center;
font-family:'Helvetica';
font-size:30px;
margin:0 auto;
width:90%;
height:90%;
}
p { font-size:18px;}
#greenLegend { color:#3EA055; font-size:18px;}
#yellowLegend { color:#CDAD00; font-size:18px;}
</style>
</body>
</html>
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