#!/usr/bin/perl
 
  # $Id: hpsetdisp.pl 2 2008-07-10 00:05:58Z yaakov $
 
  # hpsetdisp.pl  
  # Connects to a JetDirect equipped HP printer and uses 
  # HP's control language to set the ready message on the
  # LCD display.  Takes an IP address and message on the
  # command line. My favorite message is "INSERT COIN".
  # Keep in mind the limitations of the display when composing 
  # your clever verbiage.
  # 
  # THIS PROGRAM IS PROVIDED WITH NO WARRANTY OF ANY KIND EXPRESSED OR IMPLIED
  # THE AUTHOR CANNOT BE RESPONSIBLE FOR THE EFFECTS OF THIS PROGRAM
  # IF YOU ARE UNCERTAIN ABOUT THE ADVISABILITY OF USING IT, DO NOT!
  #
  # Yaakov (http://kovaya.com/)
 
use strict;
use warnings;
 
unless (@ARGV) { print "usage: $0 <ip address> \"<RDYMSG>\"\n" ; exit }
if ($ARGV[3]) { print "Your New Message\n" ; exit }
 
my $peeraddr = $ARGV[0];
my $rdymsg = $ARGV[1];
chomp $peeraddr;
 
use IO::Socket;
my $socket = IO::Socket::INET->new(
    PeerAddr  => $peeraddr,
    PeerPort  => "9100",
    Proto     => "tcp",
    Type      => SOCK_STREAM
    ) or die "Could not create socket: $!";
 
my $data = <<EOJ
\e%-12345X\@PJL JOB
\@PJL RDYMSG DISPLAY="$rdymsg"
\@PJL EOJ
\e%-12345X
EOJ
;
 
print $socket $data;