power control utility for onkyo eiscp receivers

onkyo_power.py

#!/usr/bin/python
"""Simple power on/off control for Onkyo receivers.

Derived from https://github.com/compbrain/Onkyo-TX-NR708-Control
"""

__author__ = 'Will Nowak <wan@ccs.neu.edu>'

import socket
import sys

ISCP_CMDS = {'on': 'PWR01', 'off': 'PWR00'}

if len(sys.argv) != 3 or sys.argv[2] not in ISCP_CMDS:
  sys.stderr.write('Usage: %s <ip> <on/off>\n' % sys.argv[0])
  sys.exit(1)

_, target, mode = sys.argv

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((target, 60128))

command = ISCP_CMDS[mode]
if '!1' != command[:2]:
  command = '!1%s' % command
command_length = len(command)
pad = chr(command_length + 1 + 16)

hex_command = ('ISCP\x00\x00\x00\x10\x00\x00\x00%s\x01\x00\x00\x00%s\x0D'
               % (pad, command))

s.send(hex_command)
s.close()