dummybattery.py

import platform
from gi.repository import GLib

from dbus_entities import dbusconnection
from vedbus import VeDbusService


class DummyBattery(object):
    def __init__(self):
        self._dbusservice = VeDbusService(
            "com.victronenergy.battery.dummy", dbusconnection()
        )
        self._paths = {
            "/Dc/0/Voltage": {"initial": 54.0},
            "/Dc/0/Current": {"initial": 0.926},
            "/Dc/0/Power": {"initial": 50.0},
        }

        # Create the management objects, as specified in the ccgx dbus-api document
        self._dbusservice.add_path("/Mgmt/ProcessName", __file__)
        self._dbusservice.add_path(
            "/Mgmt/ProcessVersion",
            "Unkown version, and running on Python " + platform.python_version(),
        )
        self._dbusservice.add_path("/Mgmt/Connection", "Not implemented")

        # Create the mandatory objects
        self._dbusservice.add_path("/DeviceInstance", 0)
        self._dbusservice.add_path("/ProductId", 0)
        self._dbusservice.add_path("/ProductName", "Dummy Battery")
        self._dbusservice.add_path("/FirmwareVersion", 0)
        self._dbusservice.add_path("/HardwareVersion", 0)
        self._dbusservice.add_path("/Connected", 1)

        for path, settings in self._paths.items():
            self._dbusservice.add_path(
                path,
                settings["initial"],
                writeable=True,
                onchangecallback=self._handlechangedvalue,
            )

        GLib.timeout_add(1000, self._update)

    def _update(self):
        with self._dbusservice as s:
            for path, settings in self._paths.items():
                if "update" in settings:
                    update = settings["update"]
                    if callable(update):
                        s[path] = update(path, s[path])
                    else:
                        s[path] += update
        return True

    def _handlechangedvalue(self, path, value):
        return True