nRF52840DK as central cannot establish a connection to a peripheral anymore

RE: nRF52840DK as central cannot establish a connection to a peripheral anymore

Sigurd — Wed, 03 May 2023 14:10:54 GMT

[quote user="Michael111"]This means, that I am indeed scanning. But there is a problem with my filters, right?[/quote]

Correct!

RE: nRF52840DK as central cannot establish a connection to a peripheral anymore

Michael111 — Tue, 02 May 2023 15:16:29 GMT

Hello Sigurd,

thanks for the help so far.

I modified the scan_evt_handler, so that I can log every event.

/**@brief Function for handling Scanning Module events.
 */
static void scan_evt_handler(scan_evt_t const * p_scan_evt)
{
    ret_code_t err_code;

    switch(p_scan_evt->scan_evt_id)
    {
        case NRF_BLE_SCAN_EVT_WHITELIST_REQUEST:
        {
            NRF_LOG_INFO("NRF_BLE_SCAN_EVT_WHITELIST_REQUEST");
            on_whitelist_req();
            m_whitelist_disabled = false;
        } break;
         
        case NRF_BLE_SCAN_EVT_CONNECTING_ERROR:
        {
            NRF_LOG_INFO("NRF_BLE_SCAN_EVT_CONNECTING_ERROR");
            err_code = p_scan_evt->params.connecting_err.err_code;
            APP_ERROR_CHECK(err_code);
        } break;

        case NRF_BLE_SCAN_EVT_CONNECTED:
        {
            ble_gap_evt_connected_t const * p_connected =
                           p_scan_evt->params.connected.p_connected;
                           // Scan is automatically stopped by the connection.
                           NRF_LOG_INFO("Connecting to target %02x%02x%02x%02x%02x%02x",
                                    p_connected->peer_addr.addr[0],
                                    p_connected->peer_addr.addr[1],
                                    p_connected->peer_addr.addr[2],
                                    p_connected->peer_addr.addr[3],
                                    p_connected->peer_addr.addr[4],
                                    p_connected->peer_addr.addr[5]
                                    );
        } break;
        
        case NRF_BLE_SCAN_EVT_FILTER_MATCH:
        {
            NRF_LOG_INFO("NRF_BLE_SCAN_EVT_FILTER_MATCH");
            break;
        }

        case NRF_BLE_SCAN_EVT_WHITELIST_ADV_REPORT:
        {
           NRF_LOG_INFO("NRF_BLE_SCAN_EVT_WHITELIST_ADV_REPORT");
           ble_gap_evt_connected_t const * p_connected = p_scan_evt->params.connected.p_connected;
           // Scan is automatically stopped by the connection.
           if(cli_activated)
           {
            nrf_fprintf(m_cli_uart.p_fprintf_ctx, "Address: %02x %02x %02x %02x %02x %02x\r" ,p_connected->peer_addr.addr[0],  p_connected->peer_addr.addr[1],
            p_connected->peer_addr.addr[2],  p_connected->peer_addr.addr[3],  p_connected->peer_addr.addr[4], p_connected->peer_addr.addr[5]);  
           }      
        }  break;

        
        case NRF_BLE_SCAN_EVT_SCAN_TIMEOUT:
        {
           NRF_LOG_INFO("Scan timed out.");
           scan_start();
        } break;

        case NRF_BLE_SCAN_EVT_NOT_FOUND:
        {
            NRF_LOG_INFO("NRF_BLE_SCAN_EVT_NOT_FOUND");
        } break;

        default:
           break;
    }
}

My result is:

<info> app: NRF_BLE_SCAN_EVT_WHITELIST_REQUEST
<info> app: Peer Count: 0
<info> app: Scan Address Count: 0
<info> app: NRF_BLE_SCAN_EVT_NOT_FOUND
<info> app: NRF_BLE_SCAN_EVT_NOT_FOUND
<info> app: NRF_BLE_SCAN_EVT_NOT_FOUND
<info> app: NRF_BLE_SCAN_EVT_NOT_FOUND
<info> app: NRF_BLE_SCAN_EVT_NOT_FOUND
<info> app: NRF_BLE_SCAN_EVT_NOT_FOUND
<info> app: NRF_BLE_SCAN_EVT_NOT_FOUND
<info> app: NRF_BLE_SCAN_EVT_NOT_FOUND
<info> app: NRF_BLE_SCAN_EVT_NOT_FOUND
<info> app: NRF_BLE_SCAN_EVT_NOT_FOUND

This means, that I am indeed scanning. But there is a problem with my filters, right?

RE: nRF52840DK as central cannot establish a connection to a peripheral anymore

Sigurd — Tue, 02 May 2023 14:19:19 GMT

Hi,

[quote user="Michael111"]2) No. But it is part auf our application to scan basically indefinetly. So this would not be triggered.[/quote]

If the filter matching is enabled and no filter is matched, NRF_BLE_SCAN_EVT_NOT_FOUND is generated. So if you have BLE devices around you, and this is not triggering, this could indicate that you are not scanning.

Could you add some logging to your scan_evt_handler(), and see what events are generated ?

(scan_evt_handler = The event handler that is registered when you called nrf_ble_scan_init())

RE: nRF52840DK as central cannot establish a connection to a peripheral anymore

Michael111 — Tue, 02 May 2023 12:07:11 GMT

Hello Sigurd.
Thank you very much for your reply.

1) Unfortunately, I cannot post my full main.c file, as it is large and part of a product. But I think I narrowed the problem down a bit to the following code part:

static void whitelist_load()
{
    ret_code_t   ret;
    pm_peer_id_t peers[8];
    uint32_t     peer_cnt;

    memset(peers, PM_PEER_ID_INVALID, sizeof(peers));
    peer_cnt = (sizeof(peers) / sizeof(pm_peer_id_t));

    // Load all peers from flash and whitelist them.
    peer_list_get(peers, &peer_cnt);

    NRF_LOG_INFO("Peer Count: %d",peer_cnt)

    ret = pm_whitelist_set(peers, peer_cnt);
    APP_ERROR_CHECK(ret);

    // Setup the device identies list.
    // Some SoftDevices do not support this feature.
    ret = pm_device_identities_list_set(peers, peer_cnt);
    if (ret != NRF_ERROR_NOT_SUPPORTED)
    {
        APP_ERROR_CHECK(ret);
    }
}



static void on_whitelist_req(void)
{
    ret_code_t err_code;

    // Whitelist buffers.
    ble_gap_addr_t whitelist_addrs[8];
    ble_gap_irk_t  whitelist_irks[8];

    memset(whitelist_addrs, 0x00, sizeof(whitelist_addrs));
    memset(whitelist_irks,  0x00, sizeof(whitelist_irks));

    uint32_t addr_cnt = (sizeof(whitelist_addrs) / sizeof(ble_gap_addr_t));
    uint32_t irk_cnt  = (sizeof(whitelist_irks)  / sizeof(ble_gap_irk_t));

    // Reload the whitelist and whitelist all peers.
    whitelist_load();

    // Get the whitelist previously set using pm_whitelist_set().
    err_code = pm_whitelist_get(whitelist_addrs, &addr_cnt,
                                whitelist_irks,  &irk_cnt);

    NRF_LOG_INFO("Scan Address Count: %d", addr_cnt)
    for (int i = 0; i < addr_cnt; i++) {
      NRF_LOG_INFO("Scanning for address: %02X %X %X %X %X %X \n", whitelist_addrs[i].addr[5],
                  whitelist_addrs[i].addr[4], whitelist_addrs[i].addr[3], whitelist_addrs[i].addr[2],
                  whitelist_addrs[i].addr[1], whitelist_addrs[i].addr[0]);
    }

    if (((addr_cnt == 0) && (irk_cnt == 0)) ||
        (m_whitelist_disabled))
    {
    // Don't use whitelist.
        err_code = nrf_ble_scan_params_set(&m_scan, NULL);
        APP_ERROR_CHECK(err_code);
    }
}

In our application the ble adresses of the peripherals are saved in the flash. When we boot up the central device, the ble adresses got read from the flash and applied to the whitelist. It seems like that this the problem. Since I receive

<info> app: Peer Count: 0
<info> app: Scan Address Count: 0

when I run the code. Maybe you can take a look to this code snippet.

2) No. But it is part auf our application to scan basically indefinetly. So this would not be triggered.

RE: nRF52840DK as central cannot establish a connection to a peripheral anymore

Sigurd — Tue, 02 May 2023 09:32:15 GMT

1) Could you post your main.c file?

2) Are you getting the event NRF_BLE_SCAN_EVT_NOT_FOUND in your

scan_evt_handler?

RE: nRF52840DK as central cannot establish a connection to a peripheral anymore

Michael111 — Tue, 02 May 2023 09:24:33 GMT

nRF5 SDK 17

RE: nRF52840DK as central cannot establish a connection to a peripheral anymore

Sigurd — Tue, 02 May 2023 09:23:25 GMT

Hi,

What SDK are you using ? nRF Connect SDK or nRF5-SDK?