diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9258caa..b3c63ee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,11 @@
 
 - **Breaking:** rename `MotorController` to `TMCMotorActor` and `MotorDirector` to `TMCMotorDirector`
 
+### Added
+
+- `BaseMainWindow` has `show_status_bar_message` method.
+- DataLoggerGUI and its variants have now methods to access the data, which allows adding extra data.
+
 ### Fixed
 
 - Fix DataLogger multiplot window to show value.
diff --git a/pyleco_extras/gui/data_logger/data_logger.py b/pyleco_extras/gui/data_logger/data_logger.py
index 4e35caa..2bf7790 100644
--- a/pyleco_extras/gui/data_logger/data_logger.py
+++ b/pyleco_extras/gui/data_logger/data_logger.py
@@ -126,7 +126,7 @@ def save_data(self, meta: Optional[dict] = None, suffix: str = "") -> str:
         """
         # Preparation.
         self.leSavedName.setText("Saving...")
-        self.statusBar().showMessage("Saving...")  # type: ignore
+        self.show_status_bar_message("Saving...")
         settings = QtCore.QSettings()
         folder = settings.value("savePath", type=str)
         self.listener.message_handler.directory = folder
@@ -144,13 +144,13 @@ def save_data(self, meta: Optional[dict] = None, suffix: str = "") -> str:
         except Exception as exc:
             log.exception("Some type error during saving occurred.", exc_info=exc)
             self.leSavedName.setText("Error")
-            self.statusBar().showMessage(f"Writing failed due to Error. {exc}", 5000)  # type: ignore
+            self.show_status_bar_message(f"Writing failed due to Error. {exc}", 5000)
             raise
         else:
             # Indicate the name.
             log.info(f"Saved data to '{folder}/{file_name}'.")
             self.leSavedName.setText(file_name)
-            self.statusBar().showMessage(f"Saved data to '{folder}/{file_name}'.", 5000)  # type: ignore
+            self.show_status_bar_message(f"Saved data to '{folder}/{file_name}'.", 5000)
             return file_name
 
     @pyqtSlot()
@@ -175,7 +175,7 @@ def start(self) -> None:
                 value_repeating=self.value_repeating,
             )
         except ServerError as exc:
-            self.statusBar().showMessage(f"Communication error: {exc.rpc_error.message}", 3000)  # type: ignore
+            self.show_status_bar_message(f"Communication error: {exc.rpc_error.message}", 3000)
         except (ConnectionError, TimeoutError) as exc:
             log.exception("set property communication error", exc_info=exc)
 
diff --git a/pyleco_extras/gui/data_logger/data_logger_remote.py b/pyleco_extras/gui/data_logger/data_logger_remote.py
index 886c092..18deb07 100644
--- a/pyleco_extras/gui/data_logger/data_logger_remote.py
+++ b/pyleco_extras/gui/data_logger/data_logger_remote.py
@@ -101,9 +101,7 @@ def read_configuration(self) -> dict[str, Any]:
             config = self.communicator.ask_rpc(receiver=self.remote, method="get_configuration")
             length = self.communicator.ask_rpc(receiver=self.remote, method="get_list_length")
         except ServerError as exc:
-            self.statusBar().showMessage(  # type: ignore
-                f"Communication error: {exc.rpc_error.message}", 10000
-            )
+            self.show_status_bar_message(f"Communication error: {exc.rpc_error.message}", 10000)
             return {}
         except Exception as exc:
             log.exception("Getting configuration failed.", exc_info=exc)
@@ -124,9 +122,7 @@ def set_properties(self, properties: dict[str, Any]) -> None:
                 receiver=self.remote, method="set_configuration", configuration=properties
             )
         except ServerError as exc:
-            self.statusBar().showMessage(  # type: ignore
-                f"Communication error: {exc.rpc_error.message}", 3000
-            )
+            self.show_status_bar_message(f"Communication error: {exc.rpc_error.message}", 3000)
         except (ConnectionError, TimeoutError) as exc:
             log.exception("set property communication error", exc_info=exc)
 
@@ -211,9 +207,7 @@ def saveDataClicked(self) -> None:
         try:
             value = self.director.save_data()
         except ServerError as exc:
-            self.statusBar().showMessage(  # type: ignore
-                f"Communication error: {exc.rpc_error.message}", 3000
-            )
+            self.show_status_bar_message(f"Communication error: {exc.rpc_error.message}", 3000)
         except Exception as exc:
             log.exception("saveDataClicked", exc_info=exc)
         else:
diff --git a/pyleco_extras/gui_utils/base_main_window.py b/pyleco_extras/gui_utils/base_main_window.py
index 7e8753d..5a98b22 100644
--- a/pyleco_extras/gui_utils/base_main_window.py
+++ b/pyleco_extras/gui_utils/base_main_window.py
@@ -102,19 +102,25 @@ def stop_listen(self) -> None:
         """Stop to listen for incoming messages."""
         self.listener.stop_listen()
 
+    # LECO slots
     @Slot(Message)
-    def message_received(self, message: Message):
+    def message_received(self, message: Message) -> None:
         """Handle a message received (either a response or unsolicited)."""
         log.warning(f"Received an unhandled message: {message}")
 
-    # @Slot(str)
-    def show_namespace_information(self, full_name: str):
+    @Slot(str)
+    def show_namespace_information(self, full_name: str) -> None:
         """Show information regarding the namespace."""
         if "." in full_name:
             namespace = full_name.split(".")[0]
-            self.statusBar().showMessage(f"Signed in to namespace '{namespace}'.", 5000)  # type: ignore  # noqa
+            self.show_status_bar_message(f"Signed in to namespace '{namespace}'.", 5000)
         else:
-            self.statusBar().showMessage("Not signed in.", 5000)  # type: ignore
+            self.show_status_bar_message("Not signed in.", 5000)
+
+    # Generic methods
+    def show_status_bar_message(self, message: str, msecs: int = 0) -> None:
+        """Show `message` in the statusbar for `timeout` ms (0 means until next message)."""
+        self.statusBar().showMessage(message=message, msecs=msecs)
 
 
 class LECOBaseMainWindowDesigner(_LECOBaseMainWindow):