Server client communication Node.js -


i have written server program server.js below 

var serialport = require("serialport").serialport var io = require('socket.io').listen(80); var serialport = new serialport("com4", { baudrate: 9600  });  serialport.on("open", function () {   console.log('open');    serialport.on('data', function(data) { console.log('data received: ' + data); });     serialport.write("ls\n", function(err, results) {   console.log('err ' + err);    console.log('results ' + results); //io.sockets.emit('message', 'data');      });       });      io.sockets.on('connection', function (socket) { // if socket.io receives message client browser  // call executed. socket.on('message', function (msg) {     console.log(msg); }); // if web browser disconnects socket.io callback called. socket.on('disconnect', function () {     console.log('disconnected'); }); });    var cleandata = ''; // stores clean data   var readdata = '';  // stores buffer   serialport.on('data', function (data) { // call when data received   readdata += data.tostring(); // append data buffer   // if letters 'a' , 'b' found on buffer isolate what's in middle   // clean data. clear buffer.    if (readdata.indexof('b') >= 0 && readdata.indexof('a') >= 0) {     cleandata = readdata.substring(readdata.indexof('a') + 1, readdata.indexof('b'));     readdata = '';     io.sockets.emit('message', cleandata);       }  });

the client side program (index.html)

<html>     </head>         <link type="text/css" href="/css/smoothness/jquery-ui-1.8.20.custom.css" rel="stylesheet" />          <script type="text/javascript" src="//localhost:8000/socket.io/socket.io.js"></script>         <script type="text/javascript" src="/js/jquery-1.7.2.min.js"></script>         <script type="text/javascript" src="/js/jquery-ui-1.8.20.custom.min.js"></script>             <script>              var socket = io.connect('http://localhost:8000');             socket.on('connect', function () {                 socket.on('message', function (msg) {                     // convert value integer                     var val = ((parseint(msg) / 1023)*100);                      // put sensor value 'sensor_value' span                     $('#sensor_value').html(val);                      });             });         });         </script>     </head>     <body>         <div role="main">             potentiometer value: <span id="sensor_value"></span><br/>         </div>     </body> </html>

i using wamp web server server console giving me required output. nothing coming in webpage index.html

here can find tutorial showing you're trying do: create node.js server , forwarding data serial port html page via websockets.

it useful me when doing same, sure help.


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