refactor: DBus interface includes bus instance

Updated `InterfaceRevpiConfig` to require a bus parameter, ensuring
proper initialization. Introduced a constructor in `DbusInterface` to
store the bus instance.

Signed-off-by: Sven Sager <s.sager@kunbus.com>

src/revpi_middleware/dbus_middleware1/bus_provider.py

@@ -41,8 +41,8 @@ class BusProvider(Thread):
         #   ("Subdir2", Example()),
         #   ("Subdir2/Whatever", Example())
         lst_interfaces = [
-            InterfacePiControl(self.picontrol_device, self.config_rsc),
+            InterfacePiControl(self._bus, self.picontrol_device, self.config_rsc),
-            InterfaceRevpiConfig(),
+            InterfaceRevpiConfig(self._bus),
         ]
 
         try:

src/revpi_middleware/dbus_middleware1/dbus_helper.py

@@ -2,8 +2,10 @@
 # SPDX-FileCopyrightText: 2025 KUNBUS GmbH
 # SPDX-License-Identifier: GPL-2.0-or-later
 """Helper for dbus."""
-
 from logging import getLogger
+from typing import Union
+
+from pydbus import SessionBus, SystemBus
 
 log = getLogger(__name__)
 
@@ -13,6 +15,9 @@ REVPI_DBUS_BASE_PATH = "/com/revolutionpi/middleware1"
 
 class DbusInterface:
 
+    def __init__(self, bus: Union[SessionBus, SystemBus]):
+        self.bus = bus
+
     def cleanup(self):
         """
         Represents a method responsible for performing cleanup operations. This method is executed to properly

src/revpi_middleware/dbus_middleware1/process_image/interface_picontrol.py

@@ -26,7 +26,9 @@ class InterfacePiControl(DbusInterface):
 
     NotifyDriverReset = signal()
 
-    def __init__(self, picontrol_device: str, config_rsc: str):
+    def __init__(self, bus, picontrol_device: str, config_rsc: str):
+        super().__init__(bus)
+
         self.picontrol_device = picontrol_device
         self.config_rsc = config_rsc