fix unknown value on startup

main.py

@@ -282,14 +282,21 @@ class GadgetbridgeMQTTPublisher:
             ) as client:
                 self.mqtt_client = client
                 await self.setup_home_assistant_entities()
-                while True:
+                # Publish immediately on startup
                 steps_data = self.get_steps_data()
                 if steps_data:
                     await self.publish_steps_data(steps_data)
                 self.logger.info(
                     f"Sleeping for {self.publish_interval} seconds before next publish..."
                 )
+                while True:
                     await asyncio.sleep(self.publish_interval)
+                    steps_data = self.get_steps_data()
+                    if steps_data:
+                        await self.publish_steps_data(steps_data)
+                    self.logger.info(
+                        f"Sleeping for {self.publish_interval} seconds before next publish..."
+                    )
         except Exception as e:
             self.logger.error(f"Failed to connect to MQTT broker: {e}")