Fix retries for creating MQTT clients

app.py

@@ -107,8 +107,23 @@ def rpi_on_message(client, userdata, message):
 def get_data(serial=DEFAULT_SERIAL):
     global bambu_client, response_topic
 
+    retries = 5
+    while bambu_client is None and retries > 0:
+        try:
+            create_client("bambu")
+        except Exception as e:
+            bambu_client = None
+            logger.error(f"Failed to initialize Bambu MQTT: {e}")
+
+            retries -= 1
+
     if bambu_client is None:
-        create_client("bambu")
+        return (
+            latest_data["status"],
+            latest_data["bed_temperature"],
+            latest_data["nozzle_temperature"],
+            latest_data["update_time"],
+        )
 
     request_topic = f"bambu_a1_mini/request/{serial}"
     response_topic = f"bambu_a1_mini/response/{serial}"
@@ -567,12 +582,14 @@ if __name__ == "__main__":
         logger.info("Initializing Bambu MQTT client")
         create_client("bambu")
     except Exception as e:
+        bambu_client = None
         logger.error(f"Failed to initialize Bambu MQTT: {e}")
 
     try:
         logger.info("Initializing RPI MQTT client")
         create_client("rpi")
     except Exception as e:
+        rpi_client = None
         logger.error(f"Failed to initialize RPI MQTT: {e}")
 
     demo.queue().launch(