BLE minimal modifications to use pre shared key auth and encryption

[Fabien Comte]

Hello,

I have a nRF52 to nRF52 connection. I want to secure it (auth and if possible encryption) with a pre shared key. What are the points that I have to modify please ?

Thank you.

[Fabien Comte]

Hello Petter, I want to limit connection possibilities just to my another nRF52. No one else allowed. Man in the middle attack protected. If possible with privacy and signing of datas exchanged through the connection.