use IO::Socket::INET;
 
# auto-flush on socket
$| = 1;
 
# creating a listening socket
my $socket = new IO::Socket::INET (
	LocalHost => '0.0.0.0',
	LocalPort => '9999',
	Proto => 'tcp',
	Listen => 5,
	Reuse => 1
);
die "cannot create socket $!\n" unless $socket;
print "server waiting for client connection on port 7777\n";
 
while(1)
{
	# waiting for a new client connection
	my $client_socket = $socket->accept();
 
	# get information about a newly connected client
	my $client_address = $client_socket->peerhost();
	my $client_port = $client_socket->peerport();
	print "connection from $client_address:$client_port\n";
 
	# read up to 1024 characters from the connected client
	my $data = "";
	$client_socket->recv($data, 1024);
	print "received data: $data\n";
 	
	# write response data to the connected client
	$data = "ok";
	$client_socket->send($data);
 
	# notify client that response has been sent
	shutdown($client_socket, 1);
}
 
$socket->close();