Changes the volume of a denon network-attached receiver.

dvol.py

"""Trivial app to change the volume of my denon reciever from my laptop.
"""

import telnetlib
import sys

if __name__ == "__main__":

    if len(sys.argv) < 2:
        print("""USAGE: dvol [0-100]""")
        sys.exit()

    verbose = len(sys.argv) == 3

    HOST = "192.168.0.111"
    tn = telnetlib.Telnet(HOST)
    # valid range: 10-80
    vol = ((float(sys.argv[1])/100*70)+10)
    if vol < 10:
        vol = 10
    command = 'MV{}\r'.format(int(vol))
    if verbose: print 'command',command
    tn.write(command)
    if verbose: print(tn.read_until('\r', timeout=1))