NCS 2.2.0 - Connect two nRF52840-DKs paired with level 3 security using fixed key.

RE: NCS 2.2.0 - Connect two nRF52840-DKs paired with level 3 security using fixed key.

Joao Dullius — Fri, 23 Dec 2022 03:19:18 GMT

Hi Amanda,

I was able to figure it out.

I was misinterpreting how the .passkey_entry, .passkey_confirm and .passkey_display works.

As I want for both sides to simply set the same fixed password, I implementes it using .passkey_entry with success. This way "emulate" user entering a password by setting a fixed hard coded defined one.

As reference here is my working code regarding the pairing with fixed pass on L4:

nrf-examples/pairing_fixed_passkey at pair_ok · joaodullius/nrf-examples (github.com)

RE: NCS 2.2.0 - Connect two nRF52840-DKs paired with level 3 security using fixed key.

Amanda Hsieh — Thu, 22 Dec 2022 23:19:46 GMT

Hi,

I will be out of the office on Friday and will keep looking into this case next week.

Merry Christmas,
Amanda H.

RE: NCS 2.2.0 - Connect two nRF52840-DKs paired with level 3 security using fixed key.

Joao Dullius — Thu, 22 Dec 2022 20:31:12 GMT

Hi Amanda,

Please, see attached.

devzone.nordicsemi.com/.../level3_5F00_pairing_5F00_failure.pcapng

RE: NCS 2.2.0 - Connect two nRF52840-DKs paired with level 3 security using fixed key.

Amanda Hsieh — Thu, 22 Dec 2022 15:12:59 GMT

Hi,

Please kindly provide a sniffer log to help investigate the issue. Thanks.

-Amanda H.

RE: NCS 2.2.0 - Connect two nRF52840-DKs paired with level 3 security using fixed key.

Joao Dullius — Thu, 22 Dec 2022 13:57:22 GMT

I don't know if it is related, but i just realized that the Central running on the DK detects the peripheral also running on DK as non connectable:

[00:00:00.690,155] <inf> ble_scanner: scan_filter_match: Filters matched. Address: F9:FC:08:12:08:72 (random) connectable: 0

What do I need to change in my peripheral ad or advertising configurations for it o be detected as connectable?

Here is my current implementation:

static const struct bt_data ad[] = {
	BT_DATA_BYTES(BT_DATA_FLAGS, (BT_LE_AD_GENERAL | BT_LE_AD_NO_BREDR)),
	BT_DATA(BT_DATA_NAME_COMPLETE, DEVICE_NAME, DEVICE_NAME_LEN),
};

static const struct bt_data sd[] = {
    BT_DATA_BYTES(BT_DATA_UUID128_ALL, BT_UUID_CUSTOM_SERV_VAL),
};


	err = bt_le_adv_start(BT_LE_ADV_CONN, ad, ARRAY_SIZE(ad),
			      sd, ARRAY_SIZE(sd));
	if (err) {
		LOG_ERR("Advertising failed to start (err %d)", err);
		return;
	}