Authorization NFC BLE pairing issues

[LeaMarie]

HI all,

I'm trying to use the ble_nfc_pairing_reference example from SDK 15.0.0

I installed microECC and can now build the example using GCC on Windows.

A first pairing of Huawei Android Smartphone and the Rigado BMD-350 Eval Board is working as expected.

However, everytime I'm trying to re-connect the two devices, the smartphone shows me one of the following errors:

* Invalid PIN or

* Connection rejected

While debugging the code I was able to track these two issues down to authorization error codes 132 and 133 in ble_evt_handler (ble_m.c).

Do you have any ideas what could cause these errors?

Thanks in advance,

Lea

[Jørgen Holmefjord]

Hi,

This most likely happens because the phone does not recognize the service that is running on the board and does not store bonding information. The nRF board stores bonding data when the devices connect, but on second attempt, the phone is not able to provide the correct LTK.

Best regards,
Jørgen

[LeaMarie]

Hi Jørgen,

What service do you mean? It seems to be exaclty as you describe it: The phone seems to 'forget' the board / not store the bonding information at all, BUT it does display it in the list of 'Paired Devices'..!?

Do you have an idea how we could deal with the behaviour of the smartphone (Android 7 btw). It seems to be our only chance to find an appropriate solution on the board, as we won't be able to change Android's BT connection dialog...

Best,

Lea