Why Node js tcp server not detecting disconnected client - node.js

Question

I am trying to communicate server-client communication using TCP-IP in node js
Below is my server side code and I have a GSM device which acts as a client.When GSM device connects to the server I get the message that device is connected! but when I cut off the power supply of GSM device then the server should recognize that device is disconnected but no any message displays on screen even if I have code for the disconnect event.
server code
// Load the TCP Library
net = require('net');
// Keep track of the chat clients
var clients = [];
// Start a TCP Server
net.createServer(function (socket) {
// Identify this client
socket.name = socket.remoteAddress + ":" + socket.remotePort
// Put this new client in the list
clients.push(socket);
// Send a nice welcome message and announce
socket.write("Welcome " + socket.name + "\n");
broadcast(socket.name + " Device is connected!\n", socket);
// Handle incoming messages from clients.
socket.on('data', function (data) {
broadcast(socket.name + "> " + data, socket);
});
// Remove the client from the list when it leaves
socket.on('end', function () {
clients.splice(clients.indexOf(socket), 1);
broadcast(socket.name + " Device left.\n");
});
// Send a message to all clients
function broadcast(message, sender) {
clients.forEach(function (client) {
// Don't want to send it to sender
if (client === sender) return;
client.write(message);
});
// Log it to the server output too
process.stdout.write(message)
}
}).listen(5000);
// Put a friendly message on the terminal of the server.
console.log("Chat server running at port 5000\n");

Answer 1

// Load the TCP Library
net = require('net');
// Keep track of the chat clients
var clients = [];
// Start a TCP Server
net.createServer(function(socket) {
try {
socket.setKeepAlive(true, 600); //1 min = 60000 milliseconds.
} catch (exception) {
console.log('exception', exception);
}
socket.on('error', onError.bind({}, socket));
function onError(socket) {
//console.log('Socket error!', socket);
console.log('name', socket.name);
}
// Identify this client
socket.name = socket.remoteAddress + ":" + socket.remotePort
// Put this new client in the list
clients.push(socket);
// Send a nice welcome message and announce
socket.write("Welcome " + socket.name + "\n");
broadcast(socket.name + " joined\n", socket);
// Handle incoming messages from clients.
socket.on('data', function(data) {
console.log(data);
broadcast(socket.name + "> " + data, socket);
});
// Remove the client from the list when it leaves
socket.on('end', function() {
clients.splice(clients.indexOf(socket), 1);
broadcast(socket.name + " left .\n");
});
// Send a message to all clients
function broadcast(message, sender) {
clients.forEach(function(client) {
// Don't want to send it to sender
if (client === sender) return;
client.write(message);
});
// Log it to the server output too
process.stdout.write(message)
}
}).listen(8003);
// Put a friendly message on the terminal of the server.
console.log("Chat server running at port 8003\n");