LESC unable to pair (SM_pairing_faill )

[Arepa]

Hi all,

I have tried to mimic the LESC multi role example to my own app, but I dint have luck to pair it using LESC, MITM, and perform bonding and I received a SM_pairing_faill reason 0x0b; screen capture below:

nRF connect PC

nRF connect PC failing to pair

sniffer capture

details: Peripheral running on my peripheral device nRF52 with SDK13. Central using a nRF51 using PC nRF connect firmware.

My device does not have any Input, I am trying to perform LESC with just work

sec_params.bond           = true;
sec_params.mitm           = false;
sec_params.lesc           = true;
sec_params.keypress       = false;
sec_params.io_caps        = false;
sec_params.oob            = false;
sec_params.min_key_size   = 7;
sec_params.max_key_size   = 16;
sec_params.kdist_own.enc  = 1;
sec_params.kdist_own.id   = 1;
sec_params.kdist_peer.enc = 1;
sec_params.kdist_peer.id  = 1;

I tried use nRF connect (pc version) with the multi role example and it works with no issue, and I am pretty sure it is equal on my app (same settings), but I am stuck in the SM_paring_failed.

[Hung Bui]

Hi Arepa,

Have you handled BLE_GAP_EVT_LESC_DHKEY_REQUEST event in your application ? Make sure you used the correct curve NRF_CRYPTO_BLE_ECDH_CURVE_INFO

Error 0x08 mean BLE_GAP_SEC_STATUS_DHKEY_FAILURE as it shown in the log.

Please make sure this message sequence chart is followed correctly.