GATT events for stanadard BLE services

Hi,

Is it possible to handle the GATT events in the app level for the BLE standard services such as device information service, battery service etc.

I looked at the device info example application, the db values are set during main init and the read events are handled by the stack.

Actually we want to handle all the events at the application level as we get all information from an external MCU.

Thanks & Regards,

Sharan