code: def shadowUnregisterDeltaCallback(self):
          
          with self._dataStructureLock:
              # Update callback data structure
              del self._shadowSubscribeCallbackTable["delta"]
          # One unsubscription
          self._shadowManagerHandler.basicShadowUnsubscribe(self._shadowName, "delta")
          self._logger.info("Unsubscribed to delta topics for deviceShadow: " + self._shadowName)
docs: **Description**
  
          Cancel listening on delta topics for this device shadow by unsubscribing to delta topics. There will 
          be no delta messages received after this API call even though there is a difference between the 
          desired and reported state.
  
          **Syntax**
  
          .. code:: python
  
            # Cancel listening on delta topics for BotShadow
            BotShadow.shadowUnregisterDeltaCallback()
  
          **Parameters**
  
          None
  
          **Returns**
  
          None