UUID scan

RE: UUID scan

Joakim Jakobsen — Tue, 15 Nov 2022 13:06:35 GMT

If you are using scan filter (UUID) on the central device, you will have to match the UUID of the peripheral, yes.

Br,
Joakim

RE: UUID scan

Juniorprogrammer — Tue, 15 Nov 2022 12:45:11 GMT

So if I'm right, if I make a change in the UUID on the peripheral. I have to make changes in the m_nus_uuid on the central device?

RE: UUID scan

Joakim Jakobsen — Tue, 15 Nov 2022 12:42:07 GMT

No problem!

[quote user="Juniorprogrammer"]SCAN_UUID_FILTER includes the UUID of the peripheral device?[/quote]

Not quite. The SCAN_UUID_FILTER just defined the type of filter, i.e an UUID-filter. The "&m_nus_uuid" points to the actual UUID to use when filtering.

Br,
Joakim

RE: UUID scan

Juniorprogrammer — Tue, 15 Nov 2022 10:06:20 GMT

Thank you Joakim,

Yes you’re right I’m working with the nRF5 SDK.

I find this also but wasn’t sure if it is what I’ searching for. So the SCAN_UUID_FILTER includes the UUID of the peripheral device?

Kind regards,

RE: UUID scan

Joakim Jakobsen — Tue, 15 Nov 2022 09:03:54 GMT

From the information in the question I assume you are working with the nRF5 SDK? Correct me if I'm mistaken.

The following code are copied from the ble_app_uart_c example in the nRF5 SDK v.17.1.0:

/**@brief Function for initializing the scanning and setting the filters.
 */
static 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;

    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_UUID_FILTER, &m_nus_uuid);
    APP_ERROR_CHECK(err_code);

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

From scan_init() you can see that the scan filter are set (using nrf_ble_scan_filter_set). SCAN_UUID_FILTER is selected and a pointer to the NUS UUID.

Br,
Joakim

RE: UUID scan

Joakim Jakobsen — Tue, 15 Nov 2022 09:00:26 GMT

Hi!

Could you share which version of the SDK you are working with?

Br,
Joakim