bluez adapter base proxy class

adapter_base_class.py

from gi.repository import Gio, GLib, GObject

class BaseProxy(Gio.DBusProxy):
    __gsignals__ = {
        str('property-changed'): (GObject.SignalFlags.NO_HOOKS,
                                  None,
                                  (GObject.TYPE_PYOBJECT,
                                   GObject.TYPE_PYOBJECT,
                                   GObject.TYPE_PYOBJECT))
        }

    def __init__(self, object_path, interface_name):
        super(BaseProxy, self).__init__(
            g_name='org.bluez',
            g_connection=Gio.bus_get_sync(Gio.BusType.SYSTEM),
            g_flags=Gio.DBusProxyFlags.NONE,
            g_object_path=object_path,
            g_interface_name=interface_name)

        self.connect("g-signal", self._on_property_changed)

    def _on_property_changed(self, proxy, sender, signal_name, param):
        interface = param[0]
        key, value = param[1].popitem()
        path = proxy.get_object_path()
        print(interface, path, key, value)
        self.emit("property-changed", key, value, path)

Line 20 should be "property-changed", not "g-signal".