nRF Connect for Desktop fails to show passkey dialog with DK

[Saxman58]

With the Bluetooth Low Energy v3.0.1 app within nRF Connect for Desktop, if I use either the nRF52833 or nRF52840 Dev Kit boards as the scanning device it is able to connect, but the pairing process fails because it does not show the passkey entry dialog so I can enter the 6 digit key from our product.  This is the case for nRF Connect on both Windows 10 and MacOS.  The pairing settings have the MITM and Bond options set.

When I try the same thing using the old nRF51 dongle or the nRF52840 dongle for scanning and connecting, then the passkey entry dialog shows and works fine, as seen below:

This would appear to be a bug in the scanning firmware for the DK boards.

[Simonr]

Hi Glen

Okay, I was not able to reproduce it with the DKs I have available on my desk currently (two nRF52840 DKs that got the pop up window as expected). Can you provide some information on what version of the nRF52840 and nRF52833 DKs you're using that won't let you bond and pair on your end.

Best regards,

Simon

[Saxman58]

Hi Simon,

I tried it a few more times to confirm, including erasing the memory to force the nRF Connect for Desktop to reprogram the Nordic part.  Here are all the version numbers:

• nRF Connect for Desktop v3.11.0 with Bluetooth Low Energy app v3.0.1  (Same for both MacOS and Windows)
• nRF52833-DK PCA10100, 1.0.0, 2020.5
• nRF52840-DK PCA10056, 2.0.2, 2021.50

Of course you don't have our product to pair with, but you can see the flag settings in the WireShark capture I sent.  And again, it works fine with the nRF51 and nRF52840 dongles (and with our own app and USB/BLE dongle which uses an nRF52840).

Glen