NCS1.9.1 NRF52805 not bonding

[Jouke Waleson]

Hello,

I'm working with a little project in NCS 1.9.1, chip is NRF52805 acting as central, connecting to a peripheral that requires passkey and L3 security. Everything works as expected, but I'm now trying to store the bond information so that it works quicker and the passkey is not sent every time.

I've managed to enable SETTINGS_FCB etc. and run bt_enable(NULL) followed by settings_load(). However, instead of using an existing bond , the `passkey_entry` method is called every time, and the bonds are not stored.

I see that there is some data being stored in the flash area of the FCB. There are two keys:

- bt/hash=XXXXX

- bt/keys/MAC_OF_PERIPHERAL1=..7

the key behind the mac address is only a couple of bytes, it seems too short for IRK.

I've also configured a pairing_complete auth callback, but this is never called. I'm not sure what is going on, but it seems that pairing is not working at all. In the NRF52-dk in 52832 mode I see the exact same behavior.

Any pointers? I'd be grateful! Thanks.

-- 

Jouke

[Kenneth]

Hello,

Which conn_auth_callbacks have you defined? Which of them occur here? Have you tried CONFIG_SETTINGS_NVS instead?

Best regards,
Kenneth

[Jouke Waleson]

that is:

static struct bt_conn_auth_cb conn_auth_callbacks = {
	.pairing_complete = pairing_complete,
	.passkey_entry = passkey_entry,
	.pairing_failed = pairing_failed,
	.cancel = cancel,
	};

I’ve tried NVS too, didn’t get far with that, but as data is being written I don’t think the storage backend is the problem.

[Kenneth]

Can you take a look at some of the example project in NCS that support passkey? For instance there are both central and peripheral implementation for hids that support passkey.

Kenneth

[Jouke Waleson]

There are no examples for passkey_entry, and the other ones just have passkey_confirm and passkey_display listed (which makes sense for the variant where the key is only displayed).

[Kenneth]

Are you able to provide an on-air sniffer log for BLE?
https://www.nordicsemi.com/Products/Development-tools/nRF-Sniffer-for-Bluetooth-LE 

That was I can check if there are any errors occurding during bonding that may explain what you see.

Kenneth

[Jouke Waleson]

It took some time to get working, but here you go! 

capture-cowboy-no-bonding.pcapng

[Kenneth]

I can't find any errors no.

Can you check if settings_load() return any error code?

Can you also check the pairing_complete() cb whether "bool bonded" is set?
Ref static void pairing_complete(struct bt_conn *conn, bool bonded).

Best regards,
Kenneth