node.js - Cannot read property 'socket's of undefined when exporting socket.io -

i'm trying modularize application , emit different event client on different js file. sample code below shows event 'onlinestatus' fired led.js. keep on getting message 'type error: cannot read property 'sockets' of undefined' whenever try emit event led.js. suspect wrong when i"m trying export io /bin/www.

/bin/www

var server = http.createserver(app); var io = require('socket.io').listen(server);     var connectedclientsnum = 0;  io.sockets.on('connection', function(socket) {    console.log("client connected!");     socket.on('disconnect', function() {     console.log("client disconnected...");     console.log("total clients connected: " + --connectedclientsnum);   })  }); ... module.exports = server; module.exports.io = io; 

led.js

var io = require('../bin/www').io; ... function toggleled(leds, err, callback) {     /* toggle led value */     if (leds[0].value == 0) {         leds[0].value = 1;         leds[0].save(function(err) {             if (err) {                 err("update led error");             }             else {                 var person= {"status": "online"};                 io.sockets.emit('onlinestatus', person);                  callback("update led 0 1 success");             }         });     }      else {         leds[0].value = 0;         leds[0].save(function(err) {             if (err) {                 err("update led error");             }              else {                 var person= {"status": "offline"};                 io.sockets.emit('onlinestatus', person);                                 callback("update led 1 0 success");             }         });     }        } 

you should check docs @ socket.io , check see if there still socket.sockets.on() function still in socket.io framework. i'm not sure if still there. if must have working, try changing versions of socket.io 0.9, think work.