BLE CENTRAL: select which peripheral to connect to from the available ones.

[manuwind]

Hi all,

I am checking the Uart central and peripheral projects, also the one with usbd and I have one question that may be obvious for you.

How do you select the peripheral to connect to?

I see there is a scan_start function and the NRF_BLE_SCAN_EVT_CONNECTED event but no code to select the peripheral.

I have already implemented a MIDI BLE peripheral with the dk52, now I need the MIDI BLE central. I suppose I would have to print somewhere the available MIDI devices (peripherals) in order to let the user choose which connnect to, am I right?

Thank you in advance,

Manuel

[Sigurd]

Hi,

The ble_app_uart_c will connect to the first peripheral it finds that is advertising the UUID of the Nordic UART Service(NUS).

This is done by setting a UUID filter in scan_init(). Snippet:

    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);

The scan module supports different types of filters. Snippet:

/**@brief Types of filters.
 */
typedef enum
{
    SCAN_NAME_FILTER,       /**< Filter for names. */
    SCAN_SHORT_NAME_FILTER, /**< Filter for short names. */
    SCAN_ADDR_FILTER,       /**< Filter for addresses. */
    SCAN_UUID_FILTER,       /**< Filter for UUIDs. */
    SCAN_APPEARANCE_FILTER, /**< Filter for appearances. */
} nrf_ble_scan_filter_type_t;

[manuwind]

Thank you very much, I will check those other options as well.

In the final app I thing I'll print the found peripherals so the user can choose among them.

Regards,