Try this, and when it works, think about why it works:

#!/usr/bin/perl
use warnings;
use strict;
use IO::Socket;


my $SM = "\xfe";
my $ADRDSTN= "\x00\x09\x01\x00";
my $ADRSRC= "\x00\x08\x01\x00";
my $MID= "\x01";
my $MDLH= "\x00";
my $MDLL= "\x18";
my $SUBMID= "\x00";
my $CHreq= "\x00\x61";
my $Pity= "\xFF\x05";
my $Flags= "\x00\x20";
my $Timeout= "\x00\x00");
my $Level= "\x00\x00";
my $NumOfSrcEl= "\x01";
my $SrcEl= "\x00\xFF\x00\x84\x10\x00";
my $NumOfDstnEl= "\x01";
my $DstnEl= "\x08\x10\x00\x01\x01";
my $Rsvd= "\x00";
my $message= $ADRDSTN . $ADRSRC . $MID .$MDLH . $MDLL
           . $SUBMID . $CHreq . $Pity .$Flags . $Timeout
           . $Level . $NumOfSrcEl . $SrcEl . $NumOfDstnEl
           . $DstnEl . $Rsvd;
my $EM= "\xFD";


my $count=0;
$count += $message[$_] for 0..@message-1 ;
$count = 256 - ($count % 256);
$CHECKSUM= chr( $count );
my $VPAP= $SM . $message . $CHECKSUM . $EM;

my $sock = new IO::Socket::INET(
    PeerAddr => 'localhost',
    PeerPort => '7070',
    Proto => 'tcp',
) or die "Could not create socket: $!\n";

print $sock $@VPAP; 
close($sock);

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