RE: BLE pairing process with nRF5340 Audio

Amanda Hsieh — Wed, 31 Jul 2024 16:10:07 GMT

Hi,

[quote user=""]1. Where does the connection process between the gateway and the headset take place?[/quote]

See https://github.com/nrfconnect/sdk-nrf/blob/v2.7.0/applications/nrf5340_audio/src/bluetooth/bt_management/bt_mgmt.c#L62

[quote user=""]2. Where is the BLE bonding information set?[/quote]

See this course on how to implement bonding.

[quote user=""]3. Is it possible to rewrite the bonding information?[/quote]

Yes, it is possible to rewrite the bonding information. To clear the bonding information, press and hold BTN 5 during boot or reprogram all the development kits.

[quote user=""]4. Will reconnection occur automatically after executing bt_mgmt_bonding_clear()?[/quote]

yes, but it needs both sides to delete the bonding information.

[quote user=""]5. If I want to fix the key exchanged during pairing instead of generating it randomly, which source should I edit?[/quote]

You can use the CONFIG_BT_FIXED_PASSKEY configuration option which allows you to set a fixed passkey that will be used during the pairing process. See my colleague's example in this post. However, please note that using a fixed passkey is less secure and is not recommended for production use, as it is easy to deduce during the pairing procedure.

Regards,
Amanda H.