GUPnPContextManager
@gupnpcontextmanager: the object which received the signal.
@arg1:
@gupnpcontextmanager: the object which received the signal.
@arg1:
@main_context:
@port:
@Returns:
@port:
@Returns:
@manager:
@manager:
@control_point:
@manager:
@root_device:
@manager:
@Returns: