iOS application connecting in the background

[Jeff]

I'm using SDK 15.3.0 and SoftDevice 6.1.1 running on an nRF52832.

The iOS application works correctly when it is running in the foreground.  It is able to connect and bond to the nRF.

After it has bonded, if I try to connect in the background, I'm seeing an BLE_GAP_EVT_AUTH_STATUS event.  I don't see that event during a foreground connection. The fields in the status event are saying that the remote side (src) returned a status of BLE_GAP_SEC_STATUS_UNSPECIFIED (0x88):

[00:01:24.056,976] <debug> ble_dcs: Event BLE_GAP_EVT_AUTH_STATUS (0x19)
[00:01:24.057,006] <info> app: BLE_GAP_EVT_AUTH_STATUS: status:0x88 bond:0x0 src:0x1 lesc:0x0
[00:01:24.057,037] <info> app: BLE_GAP_EVT_AUTH_STATUS: sm1:0000
[00:01:24.057,037] <info> app: BLE_GAP_EVT_AUTH_STATUS. sm2.0000
[00:01:24.057,067] <info> app: BLE_GAP_EVT_AUTH_STATUS: kdist_own: enc:0x0 id:0x0 sign:0x0 link:0x0
[00:01:24.057,067] <info> app: BLE_GAP_EVT_AUTH_STATUS: kdist_peer: enc:0x0 id:0x0 sign:0x0 link:0x0

I'm looking for any insight into the cause of this issue and what (if anything) can be done about it?

thanks,

Jeff

[Jeff]

Hi Hung,

Just wanted to follow up and report that the extra security request was the issue.

Our application, before creating a bond, requires a signed token from the mobile app.  The logic of how that token was processed in our firmware was incorrect and causing a security request when it shouldn't have been asking for one.

Thanks for the help!

Jeff

[Hung Bui]

Hi Jeff, 

It's great that now you found the root cause. I'm glad that I can help a little bit. The sniffer traces were very useful. 
Good luck with the project !