Cannot get scanning to detect a device by advertising address.

[jfarjona]

Hello everyone,

I am modifying the ble_central_uart example to connect directly with a device using its MAC address.  For some reason I don't understand, it doesn't find the device.

As suggested by the docs and the Q/A I could find, I have the code:

/**@brief NUS UUID. */
static ble_uuid_t const m_nus_uuid = {
    .uuid = BLE_UUID_NUS_SERVICE,
    .type = NUS_SERVICE_UUID_TYPE};
    
/**
 * @brief Starts scanning for the given MAC address.
 * @details Scans for the given MAC address and connects to it.
 */
ret_code_t connect_to_mac(uint8_t mac[]) {
  ret_code_t err_code;
  nrf_ble_scan_stop();
  nrf_ble_scan_all_filter_remove(&m_scan);

  nrf_ble_scan_init_t init_scan;

  ble_gap_addr_t m_mac_filter;

  err_code = nrf_ble_scan_copy_addr_to_sd_gap_addr(&m_mac_filter, mac);

  if (err_code == NRF_SUCCESS) {        
    m_mac_filter.addr_type = BLE_GAP_ADDR_TYPE_PUBLIC;    

    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);
    if (err_code == NRF_SUCCESS) {
      err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_UUID_FILTER, &m_nus_uuid);
      if (err_code == NRF_SUCCESS) {
        err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_ADDR_FILTER, &m_mac_filter);
        if (err_code == NRF_SUCCESS) {
          err_code = nrf_ble_scan_filters_enable(&m_scan, NRF_BLE_SCAN_UUID_FILTER | NRF_BLE_SCAN_ADDR_FILTER, true);
          if (err_code == NRF_SUCCESS) {
            err_code = scan_start();
            if (err_code == NRF_SUCCESS) {
              err_code = sendStatusToUART(STATUS_SCANNING);
            }
          }
        }
      }
    }
    BLE_ERROR_CHECK(err_code);
  } else {
    sendErrorToUART(ERROR_INVALID_MAC);
  }

  return err_code;
}
    

Even if I remove the UUID filter and just look for the MAC address, the devices are never found.

What am I doing wrong? can you please point me to an explanation/solution?

Thanks,

Juan

[jfarjona]

Just found the problem.  On line 33, it should be:

err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_ADDR_FILTER, &m_mac_filter.addr);

Can dismiss this ticket.

Cheers,

Juan