I wanted to know if I can use AT commands to communicate with nrf52840 DK.
If it is possible, do I need to have a separate firmware or is nordic sdk enough?
You would have to write your own AT Command handler.
Thank you awneil, but can't we use ble_app_interactive as a starting point for this.
Please find some time answering this
That's a separate question.
If this question (about AT commands) is resolved, then please verify the answer.