Automatic Passkey authentication for central and peripheral

[noob_123]

Hi,

I have been looking into the passkey for BLE connection but didn't found any clear documentation or any example on this. If we have one central and one peripheral then how can we add a passkey and allow both devices to exchange or confirm this key. I can see example in nrf samples like peripheral_uart and central_uart and found passkey related thing on peripheral_uart. Searching on google I found a function like  bt_passkey_set(passkey); and  CONFIG_BT_FIXED_PASSKEY=y option, But cannot find a use of this anywhere in nrf samples or any example. 

Is this not supported by nrf connect SDK or it is not for the purpose of pairing or making a connection or what? 

Is there any option like this to use in nrf? If YES then where can it be found somewhere on internet, how can we confirm the passkey on peripheral side or know that passkey is correct or incorrect? 

Thank you

[Vidar Berg]

Hi,

The SDK does not include any samples which demonstrate this feature. It's likely because it is not recommended to use static passkeys as it can compromise the security of the connection (the passkey can be brute forced if it is being reused). 

My colleague Kenneth explains how you can enable static passkey pairing on the peripheral and central in this thread:  Zephyr BLE static passkey between central and peripheral on two nrf52840s if you still want this.

Best regards,

Vidar