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?