I want to get pheriphetial device name..

I am a beginner developer.

I am working on ble_app_multilink_central and ble_app_uart-based projects and succeeded in BLE multi-connecting. But there is a problem. An error occurs in the BLE connection. In my project, when the device names of central and peripheral match, sd_ble_gap_connect is executed to establish a BLE connection between devices. However, even though the device name between the two devices is different, it sometimes becomes a BLE connection. It's not always like that, so I'm very frustrated. So I want to check the device name of peripheral in central.

I think the solution may be related to "static void on_adv_report (ble_gap_evt_adv_report_t const * p_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;


    if ( ble_advdata_name_find(p_adv_report->data.p_data, p_adv_report->data.len, m_target_periph_name) || ble_advdata_name_find(p_adv_report->data.p_data, p_adv_report->data.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 		
                NRF_LOG_ERROR("Connection Request Failed, reason %d", err_code);
#endif			
            }
#ifdef DEBUG 		
                NRF_LOG_ERROR("Connection Request Failed, reason %d", err_code);
#endif

    }   

}

And I checked 'bool ble_advdata_name_find' at C:\Users\Root\Desktop\nordic_15.2\components\ble\common\ble_advdata.c

bool ble_advdata_name_find(uint8_t const * p_encoded_data,
                           uint16_t        data_len,
                           char    const * p_target_name)
{
    uint16_t        parsed_name_len;
    uint8_t const * p_parsed_name;
    uint16_t        data_offset          = 0;

    if (p_target_name == NULL)
    {
        return false;
    }


    parsed_name_len = ble_advdata_search(p_encoded_data,
                                         data_len,
                                         &data_offset,
                                         BLE_GAP_AD_TYPE_COMPLETE_LOCAL_NAME);

    p_parsed_name = &p_encoded_data[data_offset];

    if (   (data_offset != 0)
        && (parsed_name_len != 0)
        && (strlen(p_target_name) == parsed_name_len)
        && (memcmp(p_target_name, p_parsed_name, parsed_name_len) == 0))
    {
        return true;
    }

    return false;
}

That's all I found out.
I want to debug the device name that peripheral advertises.

Please help me solve this problem. T^T

Parents

0 eggmoneyna over 4 years ago

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.

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