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index.js

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+const express = require('express');
+const app = express();
+
+const port = 80;
+
+app.get('/', function(req, res){
+	res.sendFile(__dirname + "/page/index.html");
+});
+
+const server = app.listen(port,function(){
+	console.log("server is running at port : " + port);
+});
+
+const SocketServer = require('ws').Server;
+const wss = new SocketServer({server});
+
+//colors data
+let color = {
+	red: 0,
+	green: 0,
+	blue: 0
+};
+let fadeValue = 0; //value of brightness 
+let led = 'r'; //the color that changed
+
+let count = 0; //counter for how many times clients connected
+wss.on('connection', function(ws){
+	count += 1; // add one when a client connected
+	console.log("Client number " + count + " connected");
+	ws.send("Hello Client");
+
+	//send colors value to client when connected
+	ws.send('r' + color["red"]);
+	ws.send('g' + color["green"]);
+	ws.send('b' + color["blue"]);
+
+	ws.on('message', function(msg){
+		console.log("message from Client : " + msg.toString()); //show the message that client sent
+
+		if(msg.toString().charAt(0)=='r' || msg.toString().charAt(0)=='g' || msg.toString().charAt(0)=='b'){//check wheither the value to change color
+			if(parseInt(msg.toString().substring(1)) >= 0 && parseInt(msg.toString().substring(1)) <= 255){ //check the range
+				led = msg.toString().charAt(0);//what color changed
+				fadeValue = parseInt(msg.toString().substring(1)); // the brightness of the color that changed
+
+				//save data in server for anther client
+				if(led == 'r'){
+					color["red"] = fadeValue;
+				}else if(led == 'g'){
+					color["green"] = fadeValue;
+				}else if(led == 'b'){
+					color["blue"] = fadeValue;
+				}
+			}
+			console.log("Data that will be Sent : " + led + fadeValue)
+			broadcast(led + fadeValue); //send data for all clients
+		}
+
+	});
+
+	ws.on('close', function(){
+		console.log("client is desconected");
+	});
+
+});
+
+//function to send data to all clients
+function broadcast(msg){
+	wss.clients.forEach(function (client){
+		if(client.readyState == client.OPEN){ // if client still connected
+			client.send(msg);
+		}
+	});
+};