Intel Dual Band Wireless-AC 7260 BLE issue

[eugenePi]

Dear all, 

I'm using an nRF51822 chip for implementing a BLE HID device (mouse) (SDK ver. 12.3.0, SD ver. s130_2.0.1)

I have problems when connecting via BLE with laptops that have Intel 7260 adapter onboard.

Under Windows 10:

It initially pairs and reconnects ok, but after several hours, when switching nRF device power ON-OFF, it stops reconnection.

Sometimes, while working, the driver error appears, and the Intel device disappears from system.

And to recover, it only helps to restart it under Linux.

Under Linux (Ubuntu 16.04, kernel 4.15.0-62):

7260 adapter doesn't finish pairing with nRF device correctly, until I do the following cmd:

sudo hciconfig hci0 noauth

After this, it pairs and reconnects ok - but worked with big lags, mouse motion is very slow.

Any suggestions how to deal with that issue?

Regards, Eugene

[Edvin]

Hello Eugene,

Sorry for the late reply. 

You say that it works when you use the command "sudo hciconfig hci0 noauth". Do you use MITM protection in your ble_app_hids_mouse project?

Is it possible to provide a sniffer trace?

I asked a colleague to check if he had any ideas. He also said that it could help to update the blueZ drivers on the computer, if you use that.

Best regards,

Edvin

[eugenePi]

Hi Edvin,

Thanks for your reply!

I don't use MITM protection (I use BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM)

I'll find out if I can provide sniffer trace and update blueZ (The version I use is 5.37)

What about Windows, are there any ideas?

Regards, Eugene

[Edvin]

eugenePi said:

What about Windows, are there any ideas?

 I would need to see a sniffer log there as well. To 1: See if the device advertises, and 2: See whether windows tries to connect or not. 

[eugenePi]

Hi again,

I returned to the issue and managed to collect the logs of pairing with Intel adapter under Linux.

What's more, I discovered pairing problem with Xiaomi Redmi Note 4x Android phone.

I attach the Wireshark packet dumps, both with unsuccessful pairing.

With Intel, SCAN_REQ remains unresponded and advertising stops from NRF side.

With Redmi, SCAN_REQ is answered with SCAN_RESP, and NRF continues advertising.

intel.pcapng

redmi.pcapng

[Edvin]

so none of these have the desired response, right?

Does anything happen on the nRF side? Have you tried debugging? Does the error handler get caught in anything? What does your application look like? What changes did you do to the HID project?