#!/usr/bin/perl

use strict;
use warnings;
use feature 'say';

use IO::Socket qw(AF_INET AF_UNIX SOCK_STREAM SHUT_WR);
use Data::Dumper;
 
my $server = IO::Socket->new(
    Domain => AF_INET,
    Type => SOCK_STREAM,
    Proto => 'tcp',
    LocalHost => '0.0.0.0',
    LocalPort => 3333,
    ReusePort => 1,
    Listen => 5,
) || die "Can't open socket: $IO::Socket::errstr";
say "Waiting on 3333";
 
while (1) {    
    my $client = $server->accept();   
    my $client_address = $client->peerhost();
    my $client_port = $client->peerport();
    say "Connection from $client_address:$client_port";
 
    my $data;
    $client->recv($data, 1024);
    say "received data: $data";
 
    if ($data =~ m/99/)	{
         $data = "We've received a string starting withh 99";
    }
    if ($data =~ m/63/) {
	$data = "We've received a string starting with 63";
	}
    $client->send($data);

}