Client:
use Storable qw(freeze);
use IO::Socket;

use strict;
use warnings;

my $c = new IO::Socket::INET(Proto => "udp",
                                  PeerAddr => "localhost",
                                  PeerPort => 3000,
                                  Timeout => 1);

print "Connected\n";
my $h = {"key" => [1,2,3,4,5,6,7,8,9,10]};
my $arr_freezed = freeze($h);
$c->send($arr_freezed);
close $c;

Server:
use IO::Socket;
use Storable qw(thaw);
use Data::Dumper;

use strict;
use warnings;

my $server = new IO::Socket::INET(Timeout => 7200,
                                 Proto => "udp",
                                  LocalPort => 3000,
                                  LocalHost => "localhost");
print "Server is listening ...\n";
my $arr_freezed;
$server->recv($arr_freezed, 1000);
my $h = thaw($arr_freezed);
print Dumper($h);
close $server;