Hi Everyone! I want to create a udp server, which listens for clients, and then reply to them, i have written a sub function for it, but it doesn't listen, and exits with a warning like this:Can't call method "recv" on an undefined value at .. line 114 the sub function is like this:

sub listen{
use IO::Socket;
my $port1 = @_;
$proto = 'udp';
$socket1 = new IO::Socket::INET (LocalPort => $port1,Proto=> $proto)or
+ die "Cannot Listen On The Socket $@";
print " Waiting for connection\n";
my $MAX_TO_READ = 512;
my $datagram;
 while (1){
    
    $server->recv($datagram,$MAX_TO_READ);
    
    if($datagram ne '')
    {
        print "\nReceived message '", $datagram,"'\n";
    }
    # If client message is empty exit
    else
    {
        print "Cilent has exited!";
        exit 1;
    }

    return $server;
    }
}
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and i am calling it like this: &rdt_listen($ARGV[1]) thanx in advance