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while (1) {
    warn "Waiting for PDU";
...
    sleep 1;
    }
}

0x00000015 => { cmd => 'enquire_link',
            reply => sub { my ($me, $pdu) = @_;
                   $me->enquire_link_resp(seq => $pdu->{seq}) }, },

Received #2 21:enquire_link
$VAR1 = bless( {
                 'known_pdu' => 1,
...
                 'seq' => 2
               }, 'Net::SMPP::PDU' );
Can't call method "enquire_link_resp" on an undefined value at .....es
+me-re.pl line 89.