RE: Problems pairing with iOS device using LE Secure Connections

Mttrinh — Wed, 16 May 2018 15:58:28 GMT

Hi,

Have you also tried your application with Android, to see if it works?

I suggest you to have a look at the LE Secure Connections Multirole Example.

RE: Problems pairing with iOS device using LE Secure Connections

swlnk — Thu, 10 May 2018 01:59:50 GMT

I spent a bit more time investigating this and have a couple more comments:

1. Rather than using my own iOS app, I tried using LightBlue, and saw that the iPhone is sending the SMP Pairing Failed packet with reason code 0x08 (Unspecified Reason) every time I attempt the pairing, immediately after the peripheral sends the SMP Pairing Confirm packet, and the phone is longer terminating the connection. It realized that the connection termination was actually being done by my app and not the iOS CoreBluetooth stack. I was not seeing the SMP Pairing Failed packet some of the time because the app was sending the terminate request before the SMP Pairing Failed packet could be sent.

This reinforces the possibility that there is something wrong with the SMP Pairing Confirm Packet that is causing the a pairing failure.

2. I tried to use the "Debug Mode" keys that are given in the BT 4.2 core spec (Vol 3, Part H, Section 2.3.5.6.1) in order to make sure that my public key was valid. Doing this did not change the result - the iPhone still sends the SMP Pairing Failed Packet with core 0x08 (Unspecified Reason).

Any idea what might be happening? Thanks.