SMP Pairing Failed message is not sent from Peripheral to Central in Numeric Comparison Bonding

[Mina Aziz]

Hello Everyone. I tried to run the ble_app_multirole_lesc example on SDK 16.0.0 to test the numeric comparison match feature on bonding. And found that the handling of this feature shall follow the same sequence diagram illustrated in this link: infocenter.nordicsemi.com/index.jsp I noticed that the SMP Pairing Failed message is not sent from the peripheral to central if we rejected the pairing from the peripheral device only and no action is taken from the central side. Attached our sniffing sessions.

Multirole LESC Reject Pairing Peripheral_SD_7_2_0.pcapng

[Mina Aziz]

I noticed that the peripheral initiates a disconnection in case of the bonding failed in the BLE_GAP_EVT_AUTH_STATUS event if the error code doesn't equal to BLE_GAP_SEC_STATUS_SUCCESS. I commented this action and noticed that the central initiates the disconnection due to BLE operation timeout. So why the SMP Pairing failed message is not propagated by the soft device to the master? Note: I tried the same example with both soft device hex files with version 7.0.1 and SD 7.2.0 and the same behavior occurred. Attached the Sniffing Session after removing the peripheral side disconnection on Auth Status Failure.

LESC_CANCEL_PER_DISCON_SD_7_2_0.pcapng

[Mina Aziz]

Are there any updates regarding this issue?