Received #2 21:enquire_link
$VAR1 = bless( {
                 'known_pdu' => 1,
                 'cmd' => 21,
                 'status' => 0,
                 'data' => '',
                 'reserved' => undef,
                 'seq' => 2
               }, 'Net::SMPP::PDU' );
Can't call method "enquire_link_resp" on an undefined value at .....esme-re.pl line 89.