Scanning filter fail

[Nguyen Trong Tuan]

Hello everyone,

I'm programming for nRF52833, using SDK17. When I program for scanning filter (SCAN_NAME_FILTER and SCAN_UUID_FILTER) and debug, I got these errors. I don't know where these errors came from. Can anyone help me with this??

Here is my code and my errors.

Hope for your reply as soon as possible!!

Thanks

Best regards,

static ble_uuid_t const m_nus_uuid =
{
    .uuid = BLE_UUID_NUS_SERVICE,
    .type = NUS_SERVICE_UUID_TYPE
};


static char const m_target_periph_name[] = "BLE_DEMO_24"; 

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

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

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


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

    err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_UUID_FILTER, &m_nus_uuid);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_ble_scan_filters_enable(&m_scan, NRF_BLE_SCAN_NAME_FILTER | NRF_BLE_SCAN_UUID_FILTER, false);
    APP_ERROR_CHECK(err_code);

}

[Einar Thorsrud]

Hi,

The error code is 0x12 which is NRF_ERROR_CONN_COUNT, so most likely you have configured too few connections in sdk_config.h. What is the value of NRF_SDH_BLE_TOTAL_LINK_COUNT and NRF_SDH_BLE_CENTRAL_LINK_COUNT? Assuming you should ave one connection, both needs to be (at least) 1. Note that if you increase this number you also need to reserve more RAM to the SoftDevice.

[Nguyen Trong Tuan]

Hi,

tks for your reply and I really sorry about my late reply. Really sorry about that. 

The I let the value of NRF_SDH_BLE_CENTRAL_LINK_COUNT = 0; and NRF_SDH_BLE_TOTAL_LINK_COUNT = 1;

So should I increase them???

[Einar Thorsrud]

Yes, you must set NRF_SDH_BLE_CENTRAL_LINK_COUNT to at least 1 (and keep NRF_SDH_BLE_TOTAL_LINK_COUNT at at least 1) in order to perform scanning.

[Nguyen Trong Tuan]

How can you change the ram size?? I mean we just decrease the RAM SIZE that's all. Because after change the params I got the error 0x04 @@

[Einar Thorsrud]

Hi,

Exactly how you adjust the RAM start address and size depends on the toolchain, and the correct value can be observed from log or by debugging when you initialize the SoftDevice. The process is explained in detail here.