Change the LCD Display Message on HP LaserJet Printers

rdymsg.py

#!/usr/local/bin/python

import socket
import sys

if(len(sys.argv) != 3):
    print('usage: rdymsg.py PRINTER MESSAGE')
    sys.exit(1)

printer = sys.argv[1]
message = '\x1b%%-12345X@PJL JOB\n@PJL RDYMSG DISPLAY="%s"\n@PJL EOJ\n\x1b%%-12345X' % (sys.argv[2])
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_TCP)
s.connect((printer, 9100))
s.send(message)
s.close()

sys.exit(0)