code: def _enable_rpcs(self, conn, services, timeout=1.0):
          
  
          #FIXME: Check for characteristic existence in a try/catch and return failure if not found
  
          success, result = self._set_notification(conn, services[TileBusService]['characteristics'][TileBusReceiveHeaderCharacteristic], True, timeout)
          if not success:
              return success, result
  
          return self._set_notification(conn, services[TileBusService]['characteristics'][TileBusReceivePayloadCharacteristic], True, timeout)
docs: Prepare this device to receive RPCs