Bluetooth LE pairing failing due to encryption not being started

Originator:martijn
Number:rdar://21445532 Date Originated:18-Jun-2015 08:39 PM
Status:Open Resolved:No
Product:iOS Product Version:9 beta 1
Classification:Serious Bug Reproducible:Sometimes
 
Summary:
I have been seeing an issue where iOS 9 beta 1 was having trouble pairing with another Bluetooth LE device.

What I saw on an air trace:
1. LE Pairing procedure started (iPhone as master, accessory as slave)
2. Pairing Random is exchanged in both directions
3. LL_ENC_REQ does not get sent by the BT controller of the iPhone, so link does not get encrypted
4. Pairing procedure fails due to timeout

Steps to Reproduce:
I'm not sure how to reproduce it.
I've hit this a couple times in a row.
After rebooting the iPhone, the problem went away.

Expected Results:
The master (iPhone) should send LL_ENC_REQ to start encrypting the link, so that the Pairing procedure can continue.

Actual Results:
LL_ENC_REQ does not get sent by the BT controller of the iPhone, so link does not get encrypted and the Pairing procedure fails.

Version:
iOS 9 beta 1 (13A4254v)

Notes:


Configuration:
iPhone 5 (A1429)

Attachments:

Comments


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