For a breadboard, we would like to duplicate the programmation part of the nRF52840 dev. kit.
Can you provide the layout of the dev. kit in electronic form (Mentor or Altium) ?
Can you provide as well the PCA10056 preprogrammed ?
bonnet said: the programmation part of the nRF52840 dev. kit
You mean the on-board J-Link ?
I don't believe that you would be able to buy the J-Link chip, so there is probably no point in doing this.
Why not just use the on-board J-Link on the DK? It can be used to program external Nordic devices ...