RE: I want to get pheriphetial device name..

eggmoneyna — Thu, 11 Nov 2021 06:20:17 GMT

Thanks for your reply.
I can check the log and I tried it.

Before that I found a solution.
Through many posts, I found information that the peripheral device name can be obtained by using ble_advdata_parse() or ble_advdata_search() from BLE_GAP_EVT_ADV_REPORT of 'static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)'.

However, when I actually debugged, I don't know why, but the next operation of 'ble_advdata_parse()' did not proceed.

So I got the peripheral name from on_adv_report().

This is my code.

static void on_adv_report(ble_gap_evt_adv_report_t const * p_adv_report)
{
    ret_code_t err_code;
    uint16_t data_offset = 0;
    int parsed_name_len = ble_advdata_search(p_adv_report->data.p_data, p_adv_report->data.len, &data_offset, BLE_GAP_AD_TYPE_COMPLETE_LOCAL_NAME);
    uint8_t *buf = ble_advdata_parse(p_adv_report->data.p_data, p_adv_report->data.len, BLE_GAP_AD_TYPE_COMPLETE_LOCAL_NAME);

    if ( ble_advdata_name_find(p_adv_report->data.p_data, parsed_name_len, m_target_periph_name) || ble_advdata_name_find(p_adv_report->data.p_data, parsed_name_len, DEVICE_NAME))    
    {
        scan_stop();
        // Name is a match, initiate connection.
        err_code = sd_ble_gap_connect(&p_adv_report->peer_addr,
                                      &m_scan_params,
                                      &m_connection_param,
                                      APP_BLE_CONN_CFG_TAG);
            if (err_code != NRF_SUCCESS)
            {
#ifdef DEBUG 		
                printf("Connection Request Failed, reason %d \r\n", err_code);
#endif			
            }
            else
            {
#ifdef DEBUG 		
                printf("\r\n P name : ");
                for(int i  = 0 ; i < parsed_name_len; i++)
                {
                    printf("%c", buf[i]);
                }
                printf("\r\n");
                printf("Connection Request SUCESSED, reason %d \r\n", err_code);
#endif            
            }

        }
    }
    else
    {

        scan_stop();
        scan_start();

    }
    
}

The difference from the previous code is 'ble_advdata_name_find()'.
[before]
ble_advdata_name_find(p_adv_report->data.p_data, p_adv_report->data.len, m_target_periph_name)

[after]
ble_advdata_name_find(p_adv_report->data.p_data, parsed_name_len, m_target_periph_name)

When I printed 'p_adv_report->data.len', the length of the device name did not match.
Therefore, the length of the device name was obtained using ble_advdata_search() and then debugged.

Now I have to go back to the original purpose and check if the BLE connection is made with a peripheral device with a different name.
I don't know if it's a MAC address problem or the ad packet of the peripheral is broken, but I'll try to solve this problem.

RE: I want to get pheriphetial device name..

Kenneth — Wed, 10 Nov 2021 12:12:46 GMT

Hi,

Maybe do an on-air sniffer log to see actually what is on-air?
https://www.nordicsemi.com/Products/Development-tools/nRF-Sniffer-for-Bluetooth-LE

Also, you can split the if() statement in two, to check which of the m_target_periph_name vs. DEVICE_NAME is triggering true.

I can't really think of anything, though you can check the implementation of ble_advdata_name_find() and ble_advdata_search() with a newer nRF5 SDK.

Best regards,
Kenneth