Issues with Zephyr Peripheral NFC Pairing Example

[andreribeiro423]

Hi! Following my last post, I continue having problems with Zephyr Peripheral NFC Pairing Example on verifying the packets exchanged since as soon as I touch the NFC antenna with my smartphone I cannot see any Security Manager Protocol (SMP) packet exchanged in Wireshark. I needed to visualize these packets to ensure that Pairing Feature Exchange and next pairing steps (key exchange) are occurring as intended (LE Secure Connections OOB pairing).
I checked out the Sniffing the pairing procedure of a connection in the nRF Sniffer user guide. Since I am using LE Secure Connections I had to enable Secure Connections Debug Mode on the device. So, for that I added the CONFIG_BT_USE_DEBUG_KEYS=y on the prj.conf. However, after this I continued not to see any Security Manager Protocol (SMP) packet exchanged in Wireshark during the pairing procedure. I also checked out the menuconfig for exploring the available Kconfig options and ensure that the Secure Connections Debug Mode option is enabled.
Thank you for your help!

[andreribeiro423]

Sure! The problem was that as advertising is only performed after touching the NFC antenna, the intended device does not appear in the Wireshark device list during the first pairing. As the exchange of SMP packets takes place before advertising starts, if the device is not selected in the list of devices in Wireshark, the SMP packets do not appear. Thus, in the following pairings, the device is already displayed in the device list and if it is selected, the SMP packets are already displayed.