NFC pairing failed!!! ble_nfc_pairing_reference test failed!

[ParanBada]

I use the following example source code to test NFC pairing.

Example source code for NFC:
nRF5_SDK_17.0.2_d674dde\nRF5_SDK_17.0.2_d674dde\examples\ble_peripheral\experimental\ble_nfc_pairing_reference

Android phone:
Samsung Galaxy S20 Ultra.

When I touch the Android phone to the NFC antenna of the nRF-52840-DK board, it is recognized and connected normally.
However, after about 20 seconds after NFC connection, the following message appears as a toast message on the Android phone.

Couldn't pair with Nordic_NFC_PAIR_REF.

Does this message indicate that the connection failed?

So I tried two more Android phones, and the same failure message appears after pairing.
Couldn't pair with Nordic_NFC_PAIR_REF.

All of the following NFC example sources will fail.
ble_app_hrs_nfc_pairing
ble_nfc_pairing_reference

About 20 seconds after pairing, a toast message appears on the Android phone.
Couldn't pair with Nordic_NFC_PAIR_REF.

How to solve it?

[Susheel Nuguru]

I would recommend you to read the system logs on the Android. I am not so sure what this means on the specific OS and specific version of that OS. Some os specific logs can shed some more light on what might have failed

[ParanBada]

Have you tested using your Android phone?
I've tried using Samsung, LG, and Xiaomi phones and it fails the same.

Perhaps the same failure message will appear on various Android phones that you have.

[Susheel Nuguru]

I do not have those phones so I won't be able to test on that. I can try to borrow someone else phone but before that I need to know more on which project template you are using to test this from SDK?

[ParanBada]

You can do simple experiments using Samsung, LG, Xiaomi, etc. phones.
The same failure appears on any other Android phone.
If so, then there is an error in the Nordic SDK source code.
Isn't it?

Why don't you still test it with your Android phone?
Any android phone seems to show this failure.

Please try the following example quickly, and tell me how to solve this problem,

nRF5_SDK_17.0.2_d674dde\nRF5_SDK_17.0.2_d674dde\examples\ble_peripheral\experimental\ble_nfc_pairing_reference

I look forward to your reply.