RE: SCAN REQUEST HELP

gdutk001 — Tue, 18 Sep 2018 13:57:16 GMT

Thank you, i managed to get it working

RE: SCAN REQUEST HELP

Kenneth — Tue, 18 Sep 2018 12:22:28 GMT

Hi,

So if you have opened \nRF5_SDK_15.2.0_9412b96\examples\ble_central\ble_app_uart_c\, then this example by default will connect to peripheral devices which advertise/scan response with a preconfigured UUID:

#define NUS_BASE_UUID {{0x9E, 0xCA, 0xDC, 0x24, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x00, 0x00, 0x40, 0x6E}} /**< Used vendor specific UUID. */

In your case you only need to update this BASE UUID, and it will automatically connect to specific peripheral that advertise with that specific UUID in scan response packet.

But to explain a bit more:

The UUID is set in ble_nus_c_init() when calling sd_ble_uuid_vs_add().

In scan_init() the exact filter is set to look for this UUID when calling nrf_ble_scan_filter_set(&m_scan, SCAN_UUID_FILTER, &m_nus_uuid); and nrf_ble_scan_filters_enable(&m_scan, NRF_BLE_SCAN_UUID_FILTER, false);.

In scan_evt_handler() you can receive several events as the BLE scanning module have a match or connect to the device.

Btw: A scan request is automatically sent when an advertising packet is received, so no special handling for this. You can refer to nrf_ble_scan_on_ble_evt() in nrf_ble_scan.c on how to parse the BLE_GAP_EVT_ADV_REPORT (which include the scan response).

Best regards,
Kenneth