NRF buttonless DFU by ESP32

General
1

Hi all,

I trie to implement a DFU of a Nordic chip over a BLE connection from an ESP32.
I start the bootloader and connect the two characteristics but then, I cannot write to them. Unfortunately, I get no explicit error number, so I have no idea what the reason is.

Has anybody erperience with this Nordic DFU procedure controlled by an ESP32?

Thanks for any help!
Kind regards
Rolf

2

Perhaps a very concrete question: What is special about the two characteristics of the bootloader? Is ther any authentication to be done? And what is ‘Write no Reponse’ on the packet characteristic?