diff --git a/rpi/hardware/generic/serial_reader.py b/rpi/hardware/generic/serial_reader.py
index 0717a5d2..775083af 100644
--- a/rpi/hardware/generic/serial_reader.py
+++ b/rpi/hardware/generic/serial_reader.py
@@ -25,7 +25,7 @@ class SerialReader:
         if self._run_event.is_set():
             self._run_event.clear()
 
-    def subscribe(self, listener : Callable) -> None:
+    def subscribe(self, listener : Callable[[str], None]) -> None:
         self.__listeners.append(listener)
 
     def _notify(self, data : str):
@@ -38,7 +38,8 @@ class SerialReader:
             if line:
                 print("Generic method")
                 data = line.decode('utf-8', errors='ignore')
-                self._notify(data)
+                formatted_data = f'{{"uid": {data}}}'
+                self._notify(formatted_data)
 
 
 if __name__ == "__main__":