diff --git a/src/revpi_middleware/dbus_ios1/bus_provider_ios1.py b/src/revpi_middleware/dbus_ios1/bus_provider_ios1.py
index a3052fe..c6c475f 100644
--- a/src/revpi_middleware/dbus_ios1/bus_provider_ios1.py
+++ b/src/revpi_middleware/dbus_ios1/bus_provider_ios1.py
@@ -4,7 +4,7 @@
 """D-Bus bus provider for revpi_middleware."""
 
 from logging import getLogger
-from threading import Thread
+from threading import Thread, Event
 from typing import Union
 
 import revpimodio2
@@ -47,6 +47,7 @@ class BusProviderIos1(Thread):
         )
 
         self.picontrol_device = picontrol_device
+        self.published = Event()
         self.config_rsc = config_rsc
 
     def run(self):
@@ -90,6 +91,7 @@ class BusProviderIos1(Thread):
                 InterfaceIoManager(self._lst_io_interfaces, self._modio),
                 *lst_interfaces,
             )
+            self.published.set()
         except Exception as e:
             log.error(f"can not publish dbus {REVPI_DBUS_NAME}: {e}")
 
diff --git a/src/revpi_middleware/dbus_middleware1/bus_provider_middleware1.py b/src/revpi_middleware/dbus_middleware1/bus_provider_middleware1.py
index 9f98f7e..17d640d 100644
--- a/src/revpi_middleware/dbus_middleware1/bus_provider_middleware1.py
+++ b/src/revpi_middleware/dbus_middleware1/bus_provider_middleware1.py
@@ -4,7 +4,7 @@
 """D-Bus bus provider for revpi_middleware."""
 
 from logging import getLogger
-from threading import Thread
+from threading import Thread, Event
 from typing import Union
 
 from gi.repository import GLib
@@ -32,6 +32,7 @@ class BusProviderMiddleware1(Thread):
         self._loop = GLib.MainLoop()
 
         self.picontrol_device = picontrol_device
+        self.published = Event()
         self.config_rsc = config_rsc
 
     def run(self):
@@ -53,6 +54,7 @@ class BusProviderMiddleware1(Thread):
                 REVPI_DBUS_NAME,
                 *lst_interfaces,
             )
+            self.published.set()
         except Exception as e:
             log.error(f"can not publish dbus {REVPI_DBUS_NAME}: {e}")