python script that creates dummy data from a battery monitor on D-Bus

dummybattery.py

#!/usr/bin/env python

# Simple script that generates dummy data on the D-Bus. Its (only)
# the main readouts on com.victronenergy.battery. All alarms and 
# history data are currently missing, but they are simply enough
# to add. For a complete list of data normally available see:
# https://github.com/victronenergy/venus/wiki/dbus#battery-monitor
#
# Note on update rate:
# All paths that change have an update rate of 1 Hz, in this script.
# 1 Hz is also the highest update rate within Venus.
# The difference between a real installation and this script is that
# normally not all paths update every second. Voltage is typically
# quite volatile, but soc can stay at the same level for hours. And
# then there are also no PropertiesChanged signals for SOC during those
# hours: the signal is only sent when something changes. Unlike for
# example nmea 0183 and nmea2000.
#
# Usage
#
# git clone https://github.com/victronenergy/velib_python.git
#
# the script requires the python-gobject package to be
# installed. ie run sudo apt-get install python-gobject
#
# then in that same directory add this file.
# run it from the commandline (./dummybattery.py)
# leave it running, and in another terminal you can now use
# a dbus client to see it. Info on how to look around on the 
# D-Bus from the commandline is documented here:
# https://github.com/victronenergy/venus/wiki/commandline-introduction#working-with-d-bus


from dbus.mainloop.glib import DBusGMainLoop
import gobject
import argparse
import logging
import sys
import os

# our own packages
from dbusdummyservice import DbusDummyService
from logger import setup_logging

# Argument parsing
parser = argparse.ArgumentParser(
    description='dummy dbus service'
)

parser.add_argument("-n", "--name", help="the D-Bus service you want me to claim",
                type=str, default="com.victronenergy.battery.ttyO1")

args = parser.parse_args()

print(__file__ + " is starting up, use -h argument to see optional arguments")
logger = setup_logging(debug=True)

# Have a mainloop, so we can send/receive asynchronous calls to and from dbus
DBusGMainLoop(set_as_default=True)

s = DbusDummyService(
    servicename=args.name,
    deviceinstance=0,
    paths={
        '/Soc': {'initial': 100, 'update': -1},
        '/Dc/0/Voltage': {'initial': 24.3, 'update': 0.1},
        '/Dc/0/Current': {'initial': 2, 'update': 0.1},
        '/Dc/0/Power': {'initial': 48.6, 'update': 0.1}},
    productname='BMV-700',
    connection='VE.Direct port 1')

logger.info('Connected to dbus, and switching over to gobject.MainLoop() (= event based)')
mainloop = gobject.MainLoop()
mainloop.run()