Requirements
1. A networked HP printer, HP4M+ or later, with JetDirect card. Tested on 4M+, 8150DN, and 8500 so far. The later machines appear to lack lower case characters, for some reason, and all of them have varying lengths of strings they can display.
2. A host able to connect to said printer and run Perl.
Usage
hpset -m my.printer.com 'Chode Rules'
hpset -m hp.marketing.example.com 'YOU ARE WEASELS'
Actually, the quotes are optional:
hpset -m hp2.example.edu Lunch wasn't Really Chicken
There's also a -p argument to set the port, but as far as I know they all use port 9100. To reset the message, either reset the printer or run hpset with the default message, usually 'READY'.
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