How to know the device logout and actually stopped sending the packets

[jAddict7]

When a device sending packets to server A and its changed to server B. Whether server A is able to know the device is logged out completely?

In server.js,

connection.on('end', function(){
	_this.devices.splice(_this.devices.indexOf(connection), 1);
	connection.device.emit('disconnected');
});

In device.js,

this.on('disconnected', function(){
	_this.logout();
});

this.logout = function(){
	this.do_log('Device has been logged out.');
	this.loged = false;
	this.adapter.logout(); // No code in gt06n
	
	// code to send server as the device_id logout
};

But disconnected event is running very often. Is there a better solution to identify the device got disconnected completed?