use IO::Socket;
use strict;
use warnings;

my $sock = IO::Socket::INET->new(
    Proto    => 'udp',
    PeerPort => 23456,
    PeerAddr => '10.254.83.40',
) or die "Could not create socket: $!\n";
select($sock); $|=1;
$sock->send("message from client") or die "Send error: $!\n";

##</code><code>##

use IO::Socket;
use strict;
use warnings;

my $server = IO::Socket::INET->new(LocalPort => 23456,
                                Proto     => 'udp')
                        or die "Couldn't be a udp server on port 23456: $@\n";
my $MAX_TO_READ = 1024;
my $datagram = '';
while($server->recv($datagram, $MAX_TO_READ)){
        print $datagram;
}