Cannot Pair with Vendor UUID using Central device

Question

Hello,

I am using SDK 15.2 with softdevice 140 on nrf52840 board. I have been trying to get the development board to pair with a peripheral sensor with UUID "E7D4AA0F-5ACB-55C0-B177-A07D4525E1FA". I've been looking at the ble_app_uart_c example to see how to best do this. I have tried replacing the line with the original nus_base_uuid with this:

//#define NUS_BASE_UUID                   {{0x9E, 0xCA, 0xDC, 0x24, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x00, 0x00, 0x40, 0x6E}} /**< Used vendor specific UUID. */

#define NUS_BASE_UUID                   {{0xFA, 0xE1, 0x25, 0x45, 0x7D, 0xA0, 0x77, 0xB1, 0xC0, 0x55, 0xCB, 0x5A, 0x0F, 0xAA, 0xD4, 0xE7}} /**< Used vendor specific UUID. */

From what I've read about the pairing process, this should pair with my peripheral using this example, is that not correct? I can successfully pair with my peripheral using a phone that has the nrf_connect app or the lightblue app and see all the characteristics as well as being able to write/read from/to them.

I have paired with other devices in the past through the multilink example using their names however that has not worked with this one. I have also used some of the search functions such as ble_advdata_name_find(p_gap_evt->params.adv_report.data.p_data, p_gap_evt->params.adv_report.data.len , "VitalgramBLE #35015" ) however i cannot find the name or the uuid in the advertisement packets.

The device is clearly advertising however I cannot seem to find it.

Any ideas?

Regards,

Gian

Sigurd · Accepted Answer

Could it be that you have reversed the byte order of the UUID ?

If a non-whitelisted 128bit UUID is found in the event NRF_BLE_SCAN_EVT_NOT_FOUND, you can print it like this:

typedef struct
{
    uint8_t * p_data;   /**< Pointer to data. */
    uint16_t  data_len; /**< Length of data. */
} data_t;

#define N_AD_TYPES 2
#define UUID128_SIZE    16  /**< Size of 128 bit UUID. */
#include "ble_advdata.h"

/**@brief Function for handling Scanning Module events.
 */
static void scan_evt_handler(scan_evt_t const * p_scan_evt)
{
    ret_code_t err_code;
    data_t   adv_data;
    // Initialize advertisement report for parsing
    adv_data.p_data   = (uint8_t *) p_scan_evt->params.p_not_found->data.p_data;
    
    adv_data.data_len = p_scan_evt->params.p_not_found->data.len;

    uint16_t        data_offset = 0;
    uint8_t         ad_types[N_AD_TYPES];
    uint8_t       * p_parsed_uuid;
    uint16_t        parsed_uuid_len = adv_data.data_len;
    uint8_t   uuid_buffer[UUID128_SIZE];      

    switch(p_scan_evt->scan_evt_id)
    {
         case 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_SCAN_TIMEOUT:
         {
             NRF_LOG_INFO("Scan timed out.");
             scan_start();
         } break;

         case NRF_BLE_SCAN_EVT_NOT_FOUND:

            ad_types[0] = BLE_GAP_AD_TYPE_128BIT_SERVICE_UUID_COMPLETE;
            ad_types[1] = BLE_GAP_AD_TYPE_128BIT_SERVICE_UUID_MORE_AVAILABLE;

            for (uint8_t i = 0; (i < N_AD_TYPES) && (data_offset == 0); i++)
            {
                parsed_uuid_len = ble_advdata_search(adv_data.p_data, adv_data.data_len, &data_offset, ad_types[i]);
            }

            if (data_offset == 0 )
            {
                // Could not find any relevant UUIDs in the encoded data.
                return;
            }
           
            p_parsed_uuid = &adv_data.p_data[data_offset]; //The UUID we found 

            //Copy the UUID to our list of devices
            memset(uuid_buffer,0,UUID128_SIZE);
            memcpy(uuid_buffer, p_parsed_uuid, parsed_uuid_len);

             NRF_LOG_INFO("Device-addr %02x:%02x:%02x:%02x:%02x:%02x",
             p_scan_evt->params.p_not_found->peer_addr.addr[5],
             p_scan_evt->params.p_not_found->peer_addr.addr[4],
             p_scan_evt->params.p_not_found->peer_addr.addr[3],
             p_scan_evt->params.p_not_found->peer_addr.addr[2],
             p_scan_evt->params.p_not_found->peer_addr.addr[1],
             p_scan_evt->params.p_not_found->peer_addr.addr[0]
             );



            NRF_LOG_INFO("Hexdump:");
            NRF_LOG_HEXDUMP_INFO(p_parsed_uuid,parsed_uuid_len);

            break;


         default:
             break;
    }
}

Cannot Pair with Vendor UUID using Central device

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