scan status

[Swetika]

Hi,

Is there any nordic softdevice API to know whether scanning is going on or it is stopped.

Thanks

[MartinBL]

Hi,

A quick and dirty solution is to call sd_ble_gap_scan_start() this function will return NRF_ERROR_INVALID_STATE if scanning is already in progress or a connection is in the process of being established.

A different solution is to start scanning with sd_ble_gap_scan_start() (naturally you should be able to have control over this) and set a flag like is_scanning, or something like that, to indicate that you are scanning. Then you can wait for a BLE_GAP_EVT_TIMEOUT event and check the source of the error like this:

static void on_ble_evt(ble_evt_t * p_ble_evt)
{
    ....
    ....
    ....

    case BLE_GAP_EVT_TIMEOUT:
        if (p_gap_evt->params.timeout.src == BLE_GAP_TIMEOUT_SRC_SCAN)
        {
            printf("SCANNING TIMED OUT\r\n");
            
            err_code = sd_ble_gap_scan_stop();
            APP_ERROR_CHECK(err_code);
                
            err_code = bsp_indication_set(BSP_INDICATE_IDLE);
            APP_ERROR_CHECK(err_code);
        }
        break;
    ....
    ....

So now you know when scanning starts and stops.

[Swetika]

Thanks Martin!!

If I go for second solution, BLE_GAP_EVT_TIMEOUT event occurs only when sd_ble_gap_scan_start() api is called with timeout. I have implemented scan without timeout. I do set a flag that keeps the track of scan status. But I have observed sometimes when there are few connect disconnect, flag is set but I wont receive any BLE_GAP_EVT_ADV_REPORT event. I assume it is because scan is stopped. I also have a flag to check that scanning and connection process wont happen at same time.

[Swetika]

In how many cases BLE_GAP_TIMEOUT_SRC_SCAN is received?