I don't see problem here. I can suggest the following, first try my example and see if data will be sent by one chunk or will be divided onto several packets: 

#!/usr/bin/perl -w
use strict;
use warnings;

package MyPackage;

use base qw(Net::Server::PreFork);

sub process_request {
    my $self = shift;
    print 'x' x 1024;
}

MyPackage->run( port => 7777 );

[download]
Second, "firmware" makes me think that there's some device on the other end. Is it able to handle packets bigger than 128 bytes? Look if there's MSS option in SYN packet.

In reply to Re^3: Net::Server only sends 128bytes at a time by zwon
in thread Net::Server only sends 128bytes at a time by alager

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