Trouble connecting to iOS

[Wavecake]

When I connect to my device with an iPhone, using the nRF Connect app, I am experiencing an immediate disconnect.  The part does not have time to start pairing.  I have shared the Wireshark log in this post.  Could someone please help me interpret the log and see what issues I may be experiencing?  The log from the app states: "[System] Error disconnect from peripheral _____. The connection has timed our unexpectedly."

I have tried to adjust the clock PPM setting for my boarder some of the previous forum posts, but this does not help the issue.

Computer: OSX

Chipset: nRF52832

Softdevice: s132

failed_ios_connection.pcapng

[Kenneth]

The log is indeed odd, do you see this issue only when running on your own hardware or also when running on nRF52832-DK?

In any case I recommend to update to S132v3.1, you can download S132v3.1 from here:
https://www.nordicsemi.com/eng/nordic/Products/nRF52832/S132-SD-v3/56261 

Make sure to update your project with the S132v3.1 softdevice header files, then re-compile your application, and you should be able to program both S132v3.1 softdevice and application.

I recommend to check the known issue list:
https://devzone.nordicsemi.com/f/nordic-q-a/16156/what-are-sdk-12-x-0-known-issues 

Best regards,
Kenneth

[Wavecake]

So far I've narrowed some things down.

1. The BLE HTS example runs on my hardware and allows an iOS connection without any issues.

2. I realized that I don't have an external LFC.  Instead of using the SYNTH setting, I switched to the RC clk with recommended 16/2 settings.  This didn't fix any issues, but I believe it is the right thing to do.

I think the next step is to identify some error codes related to when the device disconnects.  Are there any variables I should be looking at in particular?

[Kenneth]

I assume you have updated to S132v3.1. 

What is the disconnect reason when disconnecting (e.g. on BLE_GAP_EVT_DISCONNECTED check p_ble_evt->evt.gap_evt.params.disconnected.reason)?

Best regards,
Kenneth

[Wavecake]

Yes, I updated to S132v3.1

Here's a screen shot of from the debugger.  The reason shows up as BLE_HCI_CONNECTION_TIMEOUT.

I also noticed the last GATTC event has an error code.  Is that a valid event?  Or is it wrong to interpret that event since the current event is a GAP_EVT disconnect?

[Wavecake]

I also noticed that I am receiving an unhandled BLE_EVT code 4.  The header files for common evts don't have an event defined for that value.  Any ideas what that could mean?