How to achieve passive scanning?

RE: How to achieve passive scanning?

ovrebekk — Fri, 10 Jul 2020 14:45:24 GMT

Hi Jebakumar

Is there any reason you commented out the following line:

//init_scan.conn_cfg_tag = APP_BLE_CONN_CFG_TAG;

That will probably cause issues.

I was able to modify the blinky_c example with your settings, and it works fine both with the .active flag cleared or not:

static void scan_init(void)
{
    ret_code_t          err_code;
    nrf_ble_scan_init_t init_scan;

    static ble_gap_scan_params_t m_scan_param = /**< Scan parameters requested for scanning and connection. */
    {
    .active = 0,
    .interval = 160,
    .window = 120,
    .filter_policy = BLE_GAP_SCAN_FP_ACCEPT_ALL,
    .timeout = 0,
    .scan_phys = BLE_GAP_PHY_AUTO,
    .extended = false,
    };

    memset(&init_scan, 0, sizeof(init_scan));

    init_scan.p_scan_param = &m_scan_param;
    init_scan.connect_if_match = true;
    init_scan.conn_cfg_tag     = APP_BLE_CONN_CFG_TAG;

    err_code = nrf_ble_scan_init(&m_scan, &init_scan, scan_evt_handler);
    APP_ERROR_CHECK(err_code);

    // Setting filters for scanning.
    err_code = nrf_ble_scan_filters_enable(&m_scan, NRF_BLE_SCAN_NAME_FILTER, false);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_NAME_FILTER, m_target_periph_name);
    APP_ERROR_CHECK(err_code);
}

Best regards
Torbjørn

RE: How to achieve passive scanning?

Jebakumar — Thu, 09 Jul 2020 06:30:19 GMT

Hi Torbjorn,

Thanks for reply.

We use S132 v6.1.1 and SDK v15.2.0.

My thought is to set active = 0 and so the application will get only the non connectable advertising reports.

But setting active = 0, no advertising is reported whether it is connectable or non-connectable.

It is just simple settings but not working as expected.

Best Regards,

Jebakumar

RE: How to achieve passive scanning?

ovrebekk — Wed, 08 Jul 2020 10:20:57 GMT

Can you confirm which SoftDevice version you are using?

We can't reproduce the issue using SDK v17.0.0 and S132 v7.0.1, your settings work fine, but it might be different in older version of the SoftDevice.

Best regards
Torbjørn