fix: fix backend code for redis raw data

superxas_bec/devices/timepix/timepix_fly_client/timepix_fly_backend.py

@@ -102,12 +102,12 @@ class TimepixFlyBackend:
             self.timepix_fly_client.on_connected(timeout=timeout / 2)
             if self.redis_connector is not None:
                 self.redis_connector.register(
-                    self._timepix_redis_topic, self._raw_data_redis_callback
+                    self._timepix_redis_topic, cb=self._raw_data_redis_callback
                 )
 
             # status = self.start_data_server()
             # status.wait(timeout=timeout / 2)
-        except Exception:  # pylint: disable=broad-except
+        except Exception as exc:  # pylint: disable=broad-except
             content = traceback.format_exc()
             logger.error(f"Error starting data server: {content}")
             # pylint: disable=raise-missing-from
@@ -355,7 +355,7 @@ class TimepixFlyBackend:
         Args:
             message (str): The JSON string received from Redis containing the raw data.
         """
-        self._decode_received_data(message)
+        self._process_timepix_fly_msg(message.value.data)
 
     def start_data_server(self) -> StatusBase:
         """
@@ -484,6 +484,9 @@ class TimepixFlyBackend:
         except json.JSONDecodeError:
             logger.error(f"TimePixFlyBackend: Failed to decode JSON from buffer: {buffer}")
             return  # TODO should this raise, or only log error as of now?
+        self._process_timepix_fly_msg(obj)
+
+    def _process_timepix_fly_msg(self, obj: dict) -> None:
         if obj.get("type", "") == "StartFrame":
             # Clear the message buffer when a new StartFrame is received, to avoid mixing messages from different acquisitions.
             if self.__msg_buffer: