Device/ Computer Discovery in my Network

[Alagappan M]

I was trying to write a sample program for my test project to find out all the devices(like android or IOS) or other computers connected to the network to which my computer is connected.

I am able to see all the connected devices when I login to the router administration console and I want the same list using my program.

I tried the sample code below  which I came across the post at https://gist.github.com/chrishulbert/895382 and found it interesting and tried to use it, But i was not able to get the list. Am I missing something in the below code or this is a wrong sample I am referring to?. Any help would be greatly appreciated in this regard.

The Code

// Listen for responses

function listen(port) {

var server = dgram.createSocket("udp4");

server.on("message", function (msg, rinfo) {

console.log("server got: " + msg + " from " + rinfo.address + ":" + rinfo.port);

});

server.bind(port); 

// setTimeout(function(){

// console.log("Finished waiting");

// server.close();

// },10000);

}

 

function search() {

var message = new Buffer(

"M-SEARCH * HTTP/1.1\r\n" +

"HOST:239.255.255.250:1900\r\n" +

"MAN:\"ssdp:discover\"\r\n" +

"ST:ssdp:all\r\n" + 

"MX:3\r\n" + 

"\r\n"

);

 

var client = dgram.createSocket("udp4");

client.bind(0,"",function() {

console.log(client.address().port);

listen(client.address().port);

client.send(message, 0, message.length, 1900, "239.255.255.250",function() {

// client.close();

});

}); // So that we get a port so we can listen before sending

}

search();