SD Bonding Example

[Torsten Robitzki]

Hello,

in the corse of implementing pairing / bonding on top of the softdevice, I was looking for examples. The only example I've found, that seemed to not use the peer_manager, was the ble_app_gzll. Can it be, that this example is not working (in regard to pairing) as intended? The variable s_sec_keyset is zero initialized and then the keys_own is never set. But it is check in the `BLE_GAP_EVT_SEC_INFO_REQUEST` event. There is one alias taken of s_sec_keyset in the call to `sd_ble_gap_sec_params_reply()`, but according to the documentation of sd_ble_gap_sec_params_reply, it's the callers duty to provide memory / buffers for the key.

best regards,

Torsten

[Vidar Berg]

Hello Torsten,

I haven't noticed that this example attempted to support bonding without the peer manager. Unfortunately, the implementation is incomplete. It does for instance not store data such as LTK and CCCDs, which is supposed to be kept across connections. To support bonding, I would strongly recommend you use the peer manager or at least use it as a reference if you are creating your own. 

Best regards,

Vidar

[Torsten Robitzki]

Hi Vidar,

an example, that implements bonding without the peer_manager would be great, as the peer_manager has some limitations  and overhead that is not suitable in every situation.

best regards,

Torsten

[Vidar Berg]

Hi Torsten,

I can understand your point about the overhead. Much of it is of course comes from the fact that it needs to be a generic solution and support features that won't be needed for every application (concurrent GAP roles, Service changed, GATT caching, etc).

Maybe it could be helpful to take a look at the old device manager implementation in SDK 11  as well, even though it's not supporting new features such as LESC. It has a simpler design.

[Torsten Robitzki]

thanks. I think I done with this now. My post was just to inform you, that there is an example, that might be missleading.

[Vidar Berg]

Ok, thanks for letting us know. I have reported it internally.