Get the fixed addr of ADV_REPORT continually (nRF52840)

[Billy Hsu]

Environment

1. Platform: Windows 7
2. IDE: SEGGER Embedded Studio for ARM V5.42a (64bit)
3. SDK: clean nRF5_SDK_17.1.0
4. Project: usbd_ble_uart_c_v4 and modify with usbd function
5. SoftDevice: s140_nrf52_7.2.0_softdevice.hex
6. Terminal: PuTTy (COM7 , baud rate 115200)

Purpose/ Question

Hi everybody. I want to scan and print the address of advertising data to serial port on 52840 dongle. I set the scan filter (UUID/ ADDR/ NAME/ SHORT NAME) and

print the address in case BLE_GAP_EVT_ADV_REPORT of ble_evt_handler, and then it prints the fixed direct_addr/ peer_addr and fixed peer_addr.addr_id_peer continually 

on the terminal. How can I solve it? Thank you.

Code 

1. Scan part of sdk_config.h
   

   // <e> NRF_BLE_SCAN_FILTER_ENABLE - Enabling filters for the Scanning Module.
   //==========================================================
   #ifndef NRF_BLE_SCAN_FILTER_ENABLE
   #define NRF_BLE_SCAN_FILTER_ENABLE 1
   #endif
   // <o> NRF_BLE_SCAN_UUID_CNT - Number of filters for UUIDs. 
   #ifndef NRF_BLE_SCAN_UUID_CNT
   #define NRF_BLE_SCAN_UUID_CNT 0 // v0.02
   #endif
   // <o> NRF_BLE_SCAN_NAME_CNT - Number of name filters. 
   #ifndef NRF_BLE_SCAN_NAME_CNT
   #define NRF_BLE_SCAN_NAME_CNT 0 // v0.02
   #endif
   // <o> NRF_BLE_SCAN_SHORT_NAME_CNT - Number of short name filters. 
   #ifndef NRF_BLE_SCAN_SHORT_NAME_CNT
   #define NRF_BLE_SCAN_SHORT_NAME_CNT 1
   #endif
   // <o> NRF_BLE_SCAN_ADDRESS_CNT - Number of address filters. 
   #ifndef NRF_BLE_SCAN_ADDRESS_CNT
   #define NRF_BLE_SCAN_ADDRESS_CNT 0 // v0.02
   #endif
   // <o> NRF_BLE_SCAN_APPEARANCE_CNT - Number of appearance filters. 
   #ifndef NRF_BLE_SCAN_APPEARANCE_CNT
   #define NRF_BLE_SCAN_APPEARANCE_CNT 0
   #endif

2. scan_init(void)
   

   static void scan_init(void)
   {
       ret_code_t          err_code;
       nrf_ble_scan_init_t init_scan;
   
       memset(&init_scan, 0, sizeof(init_scan));
   
       init_scan.connect_if_match = false;
       init_scan.conn_cfg_tag     = APP_BLE_CONN_CFG_TAG;
   
       err_code = nrf_ble_scan_init(&m_scan, &init_scan, scan_evt_handler);
       APP_ERROR_CHECK(err_code);
   
       /* v0.02  change from 'SCAN_UUID_FILTER' to 'SCAN_ADDR_FILTER' 
       err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_ADDR_FILTER, m_target_periph.addr);
       APP_ERROR_CHECK(err_code);
   
       err_code = nrf_ble_scan_filters_enable(&m_scan, NRF_BLE_SCAN_ADDR_FILTER, false);
       APP_ERROR_CHECK(err_code); */
       
       err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_SHORT_NAME_FILTER, m_target_periph_name);
       APP_ERROR_CHECK(err_code);
   
       err_code = nrf_ble_scan_filters_enable(&m_scan, NRF_BLE_SCAN_SHORT_NAME_FILTER, false);
       APP_ERROR_CHECK(err_code); 
   }

3. case BLE_GAP_EVT_ADV_REPORT of ble_evt_handler
   

   case BLE_GAP_EVT_ADV_REPORT: 
           {            
               size_t size;
               ret_code_t ret;
   
               size = sprintf(m_test_buffer, "PEER_ADDR:%x\r\n", p_gap_evt->params.adv_report.peer_addr.addr);
               ret = app_usbd_cdc_acm_write(&m_app_cdc_acm, m_test_buffer, size); 
               
               //size = sprintf(m_test_buffer, "DIRECT_ADDR:%s\r\n", p_gap_evt->params.adv_report.direct_addr.addr);
               //ret = app_usbd_cdc_acm_write(&m_app_cdc_acm, m_test_buffer, size); 
   
           } break;

4. Result on terminal
   

[Simonr]

Hi

Windows 7 reached end of life on January 14th, 2020 and is no longer supported, so I'm afraid we can't guarantee that anything works correctly on Windows 7. If you see the same issue using a supported Windows version, let me know and we will look into it.

Best regards,

Simon

[Billy Hsu]

Sorry, I check the system information and it's Windows 10

[Simonr]

Hi

Okay, then please explain what you want to do again, because it seems from the log like you do what you describe initially. Or am I misunderstanding something? Either way I'll need to see the piece of code where you actually do the printing as well. The main.c file would be helpful.

Best regards,

Simon

[Billy Hsu]

I want to print the correct scanning mac with ADDR filter on the serial port. I try to modify the scan UUID/ ADDR/ NAME/ SHORT NAME filter and print nothing in the case NRF_BLE_SCAN_EVT_FILTER_MATCH. I try to print the peer_addr/ direct_addr in the case BLE_GAP_EVT_ADV_REPORT and I expected many difference mac but always the fixed one. Attachment is the main.c file.

Fullscreen 11504.main.c Download

/**
 * v0.01  init version
 * v0.02  change from 'SCAN_UUID_FILTER' to 'SCAN_ADDR_FILTER' <fail>
 * v0.03  Command function
 * v0.04  print ADV-report <ongoing>
 */
/** @file
 *
 * @defgroup usbd_ble_uart_example main.c
 * @{
 * @ingroup  usbd_ble_uart_example
 * @brief    USBD CDC ACM over BLE application main file.
 *
 * This file contains the source code for a sample application that uses the Nordic UART service
 * and USBD CDC ACM library.
 * This application uses the @ref srvlib_conn_params module.
 */

#include <stdint.h>
#include <string.h>
#include "nordic_common.h"
#include "nrf.h"
#include "ble_hci.h"
#include "ble_advdata.h"
#include "ble_conn_params.h"
#include "nrf_sdh.h"
#include "nrf_sdh_soc.h"
#include "nrf_sdh_ble.h"
#include "nrf_ble_gatt.h"
#include "app_timer.h"
#include "ble_nus_c.h"
#include "app_uart.h"
#include "app_util_platform.h"
#include "bsp_btn_ble.h"
#include "nrf_ble_scan.h"
#include "ble_db_discovery.h"

#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"

#include "nrf_drv_usbd.h"
#include "nrf_drv_clock.h"
#include "nrf_gpio.h"
#include "nrf_delay.h"
#include "nrf_drv_power.h"

#include "app_error.h"
#include "app_util.h"
#include "app_usbd_core.h"
#include "app_usbd.h"
#include "app_usbd_string_desc.h"
#include "app_usbd_cdc_acm.h"
#include "app_usbd_serial_num.h"

#define LED_BLE_NUS_CONN (BSP_BOARD_LED_0)
#define LED_BLE_NUS_RX   (BSP_BOARD_LED_1)
#define LED_CDC_ACM_CONN (BSP_BOARD_LED_2)
#define LED_CDC_ACM_RX   (BSP_BOARD_LED_3)

#define LED_BLINK_INTERVAL 800

APP_TIMER_DEF(m_blink_ble);
APP_TIMER_DEF(m_blink_cdc);

/**
 * @brief App timer handler for blinking the LEDs.
 *
 * @param p_context LED to blink.
 */
void blink_handler(void * p_context)
{
    bsp_board_led_invert((uint32_t) p_context);
}

#define ENDLINE_STRING "\r\n"

// USB DEFINES START
static void cdc_acm_user_ev_handler(app_usbd_class_inst_t const * p_inst,
                                    app_usbd_cdc_acm_user_event_t event);

#define CDC_ACM_COMM_INTERFACE  0
#define CDC_ACM_COMM_EPIN       NRF_DRV_USBD_EPIN2

#define CDC_ACM_DATA_INTERFACE  1
#define CDC_ACM_DATA_EPIN       NRF_DRV_USBD_EPIN1
#define CDC_ACM_DATA_EPOUT      NRF_DRV_USBD_EPOUT1

static char m_cdc_data_array[BLE_NUS_MAX_DATA_LEN];

/** @brief CDC_ACM class instance */
APP_USBD_CDC_ACM_GLOBAL_DEF(m_app_cdc_acm,
                            cdc_acm_user_ev_handler,
                            CDC_ACM_COMM_INTERFACE,
                            CDC_ACM_DATA_INTERFACE,
                            CDC_ACM_COMM_EPIN,
                            CDC_ACM_DATA_EPIN,
                            CDC_ACM_DATA_EPOUT,
                            APP_USBD_CDC_COMM_PROTOCOL_AT_V250);

// USB DEFINES END

// BLE DEFINES START
#define APP_BLE_CONN_CFG_TAG            1                                           /**< A tag identifying the SoftDevice BLE configuration. */

#define APP_FEATURE_NOT_SUPPORTED       BLE_GATT_STATUS_ATTERR_APP_BEGIN + 2        /**< Reply when unsupported features are requested. */

#define DEVICE_NAME                     "Nordic_USBD_BLE_UART"                      /**< Name of device. Will be included in the advertising data. */
#define NUS_SERVICE_UUID_TYPE           BLE_UUID_TYPE_VENDOR_BEGIN                  /**< UUID type for the Nordic UART Service (vendor specific). */

#define APP_BLE_OBSERVER_PRIO           3                                           /**< Application's BLE observer priority. You shouldn't need to modify this value. */

#define APP_ADV_INTERVAL                64                                          /**< The advertising interval (in units of 0.625 ms. This value corresponds to 40 ms). */
#define APP_ADV_DURATION                18000                                       /**< The advertising duration (180 seconds) in units of 10 milliseconds. */


#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(20, UNIT_1_25_MS)             /**< Minimum acceptable connection interval (20 ms). Connection interval uses 1.25 ms units. */
#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(75, UNIT_1_25_MS)             /**< Maximum acceptable connection interval (75 ms). Connection interval uses 1.25 ms units. */
#define SLAVE_LATENCY                   0                                           /**< Slave latency. */
#define CONN_SUP_TIMEOUT                MSEC_TO_UNITS(4000, UNIT_10_MS)             /**< Connection supervisory timeout (4 seconds). Supervision Timeout uses 10 ms units. */
#define FIRST_CONN_PARAMS_UPDATE_DELAY  APP_TIMER_TICKS(5000)                       /**< Time from initiating an event (connect or start of notification) to the first time sd_ble_gap_conn_param_update is called (5 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY   APP_TIMER_TICKS(30000)                      /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */
#define MAX_CONN_PARAMS_UPDATE_COUNT    3                                           /**< Number of attempts before giving up the connection parameter negotiation. */

#define DEAD_BEEF                       0xDEADBEEF                                  /**< Value used as error code on stack dump. Can be used to identify stack location on stack unwind. */

#define UART_TX_BUF_SIZE                256                                         /**< UART TX buffer size. */
#define UART_RX_BUF_SIZE                256                                         /**< UART RX buffer size. */

#define ECHOBACK_BLE_UART_DATA  1                                                   /**< Echo the UART data that is received over the Nordic UART Service (NUS) back to the sender. */

BLE_NUS_C_DEF(m_ble_nus_c);
NRF_BLE_GATT_DEF(m_gatt);                                                           /**< GATT module instance. */
BLE_DB_DISCOVERY_DEF(m_db_disc);                                                    /**< Database discovery module instance. */
NRF_BLE_SCAN_DEF(m_scan);                                                           /**< Scanning Module instance. */

NRF_BLE_GQ_DEF(m_ble_gatt_queue,                                                    /**< BLE GATT Queue instance. */
               NRF_SDH_BLE_CENTRAL_LINK_COUNT,
               NRF_BLE_GQ_QUEUE_SIZE);

static uint16_t     m_ble_nus_max_data_len = BLE_GATT_ATT_MTU_DEFAULT - 3;          /**< Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic UART service module. */
static char         m_nus_data_array[BLE_NUS_MAX_DATA_LEN];

//v0.02  v0.03
#define READ_SIZE 1
static char const   m_target_periph_name[] = "MI";
static char m_cmd_buffer[1024];
static char m_test_buffer[1024];
static char m_rx_buffer[READ_SIZE];
static char m_tx_buffer[NRF_DRV_USBD_EPSIZE];
static ble_gap_addr_t m_target_periph =
{
.addr_type = BLE_GAP_ADDR_TYPE_RANDOM_STATIC,
.addr = {0x7A, 0x68, 0x4F, 0xF2, 0x96, 0x1E},

};

/**@brief NUS UUID. */
static ble_uuid_t const m_nus_uuid =
{
    .uuid = BLE_UUID_NUS_SERVICE,
    .type = NUS_SERVICE_UUID_TYPE
};

// BLE DEFINES END

/**
 * @brief Function for assert macro callback.
 *
 * @details This function will be called in case of an assert in the SoftDevice.
 *
 * @warning This handler is an example only and does not fit a final product. You need to analyze
 *          how your product is supposed to react in case of an assert.
 * @warning On assert from the SoftDevice, the system can only recover on reset.
 *
 * @param[in] line_num    Line number of the failing ASSERT call.
 * @param[in] p_file_name File name of the failing ASSERT call.
 */
void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name)
{
    app_error_handler(DEAD_BEEF, line_num, p_file_name);
}

/**@brief Function for handling the Nordic UART Service Client errors.
 *
 * @param[in]   nrf_error   Error code containing information about what went wrong.
 */
static void nus_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}

/**@brief Function for starting scanning. */
static void scan_start(void)
{
    ret_code_t ret;

    ret = nrf_ble_scan_start(&m_scan);
    APP_ERROR_CHECK(ret);

    ret = bsp_indication_set(BSP_INDICATE_SCANNING);
    APP_ERROR_CHECK(ret);
}

// v0.03  Command function
void Command()
{
    size_t size;
    ret_code_t ret;

    if(m_rx_buffer[0] == '\r')
    {
        static char *help="help";
        static char *scan="scan";
        static char *stop_scan="stop_scan";
        static char *led="led";
        static char *version = "dongle version 0.01\r\nCommand: scan\r\nCommand: stop_scan\r\n";

        if(!memcmp((void*)m_cmd_buffer, (void*)help, 4))
        {
            size = sprintf(m_cmd_buffer, version);
        }
        else if(!memcmp((void*)m_cmd_buffer, (void*)scan, 4))
        {
            scan_start();
            size = sprintf(m_cmd_buffer, "scan\r\n", m_cmd_buffer);
        }
        else if(!memcmp((void*)m_cmd_buffer, (void*)stop_scan, 9))
        {
            nrf_ble_scan_stop();
            size = sprintf(m_cmd_buffer, "stop_scan\r\n", m_cmd_buffer);
        }
        else if(!memcmp((void*)m_cmd_buffer, (void*)led, 3))
        {
            bsp_board_leds_off();
            bsp_board_led_invert(0);
        }
        else 
        {
            size = sprintf(m_cmd_buffer, "bad command\r\n", m_cmd_buffer);
        }

        ret = app_usbd_cdc_acm_write(&m_app_cdc_acm, m_cmd_buffer, size);      
        sprintf(m_cmd_buffer, "");
    }
    else
    {
        sprintf(m_cmd_buffer, "%s%c", m_cmd_buffer, m_rx_buffer[0]);
    }
}

/** @brief Function for initializing the timer module. */
static void timers_init(void)
{
    ret_code_t err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);
    err_code = app_timer_create(&m_blink_ble, APP_TIMER_MODE_REPEATED, blink_handler);
    APP_ERROR_CHECK(err_code);
    err_code = app_timer_create(&m_blink_cdc, APP_TIMER_MODE_REPEATED, blink_handler);
    APP_ERROR_CHECK(err_code);
}

/**
 * @brief Function for the GAP initialization.
 *
 * @details This function sets up all the necessary GAP (Generic Access Profile) parameters of
 *          the device. It also sets the permissions and appearance.
 */
static void gap_params_init(void)
{
    uint32_t                err_code;
    ble_gap_conn_params_t   gap_conn_params;
    ble_gap_conn_sec_mode_t sec_mode;

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);

    err_code = sd_ble_gap_device_name_set(&sec_mode,
                                          (const uint8_t *) DEVICE_NAME,
                                          strlen(DEVICE_NAME));
    APP_ERROR_CHECK(err_code);

    memset(&gap_conn_params, 0, sizeof(gap_conn_params));

    gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;
    gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;
    gap_conn_params.slave_latency     = SLAVE_LATENCY;
    gap_conn_params.conn_sup_timeout  = CONN_SUP_TIMEOUT;

    err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
    APP_ERROR_CHECK(err_code);
}


/**@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_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;

         // Billy try
         case NRF_BLE_SCAN_EVT_FILTER_MATCH:
         {
              //size_t size = sprintf(m_test_buffer, "Match:%X\r\n", p_scan_evt->params.filter_match.p_adv_report->peer_addr.addr);
              //ret_code_t ret = app_usbd_cdc_acm_write(&m_app_cdc_acm, m_test_buffer, size); 
         } break; 
         
         // Billy try
         case NRF_BLE_SCAN_EVT_NOT_FOUND:
         {
              //ble_gap_addr_t const * peer_addr = &p_scan_evt->params.p_not_found->peer_addr;
              //size_t size = sprintf(m_test_buffer, "NOT:%x\r\n", peer_addr->addr);
              //ret_code_t ret = app_usbd_cdc_acm_write(&m_app_cdc_acm, m_test_buffer, size); 
         } break;        

         default:
             break;
    }
}


/**@brief Function for initializing the scanning and setting the filters.
 */
static void scan_init(void)
{
    ret_code_t          err_code;
    nrf_ble_scan_init_t init_scan;

    memset(&init_scan, 0, sizeof(init_scan));

    init_scan.connect_if_match = false; // v0.02
    init_scan.conn_cfg_tag     = APP_BLE_CONN_CFG_TAG;

    err_code = nrf_ble_scan_init(&m_scan, &init_scan, scan_evt_handler);
    APP_ERROR_CHECK(err_code);

    /* v0.02  change from 'SCAN_UUID_FILTER' to 'SCAN_ADDR_FILTER' 
    err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_ADDR_FILTER, m_target_periph.addr);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_ble_scan_filters_enable(&m_scan, NRF_BLE_SCAN_ADDR_FILTER, false);
    APP_ERROR_CHECK(err_code); */
    
    err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_SHORT_NAME_FILTER, m_target_periph_name);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_ble_scan_filters_enable(&m_scan, NRF_BLE_SCAN_SHORT_NAME_FILTER, false);
    APP_ERROR_CHECK(err_code); 
}


/**@brief Function for handling database discovery events.
 *
 * @details This function is a callback function to handle events from the database discovery module.
 *          Depending on the UUIDs that are discovered, this function forwards the events
 *          to their respective services.
 *
 * @param[in] p_event  Pointer to the database discovery event.
 */
static void db_disc_handler(ble_db_discovery_evt_t * p_evt)
{
    ble_nus_c_on_db_disc_evt(&m_ble_nus_c, p_evt);
}


/**
 * @brief Function for handling the data from the Nordic UART Service.
 *
 * @details This function processes the data received from the Nordic UART BLE Service and sends
 *          it to the USBD CDC ACM module.
 *
 * @param[in] p_evt Nordic UART Service event.
 */
 #if 0
static void nus_data_handler(ble_nus_evt_t * p_evt)
{

    if (p_evt->type == BLE_NUS_EVT_RX_DATA)
    {
        bsp_board_led_invert(LED_BLE_NUS_RX);
        NRF_LOG_DEBUG("Received data from BLE NUS. Writing data on CDC ACM.");
        NRF_LOG_HEXDUMP_DEBUG(p_evt->params.rx_data.p_data, p_evt->params.rx_data.length);
        memcpy(m_nus_data_array, p_evt->params.rx_data.p_data, p_evt->params.rx_data.length);

        // Add endline characters
        uint16_t length = p_evt->params.rx_data.length;
        if (length + sizeof(ENDLINE_STRING) < BLE_NUS_MAX_DATA_LEN)
        {
            memcpy(m_nus_data_array + length, ENDLINE_STRING, sizeof(ENDLINE_STRING));
            length += sizeof(ENDLINE_STRING);
        }

        // Send data through CDC ACM
        ret_code_t ret = app_usbd_cdc_acm_write(&m_app_cdc_acm,
                                                m_nus_data_array,
                                                length);
        if(ret != NRF_SUCCESS)
        {
            NRF_LOG_INFO("CDC ACM unavailable, data received: %s", m_nus_data_array);
        }
    }

}
#endif

/**@brief Function for handling characters received by the Nordic UART Service (NUS).
 *
 * @details This function takes a list of characters of length data_len and prints the characters out on UART.
 *          If @ref ECHOBACK_BLE_UART_DATA is set, the data is sent back to sender.
 */
static void ble_nus_chars_received_uart_print(uint8_t * p_data, uint16_t data_len)
{
    bsp_board_led_invert(LED_BLE_NUS_RX);
    NRF_LOG_DEBUG("Received data from BLE NUS. Writing data on CDC ACM.");
    NRF_LOG_HEXDUMP_DEBUG(p_data, data_len);
    memcpy(m_nus_data_array, p_data, data_len);

    // Add endline characters
    uint16_t length = data_len;
    if (length + sizeof(ENDLINE_STRING) < BLE_NUS_MAX_DATA_LEN)
    {
        memcpy(m_nus_data_array + length, ENDLINE_STRING, sizeof(ENDLINE_STRING));
        length += sizeof(ENDLINE_STRING);
    }

    // Send data through CDC ACM
    ret_code_t ret = app_usbd_cdc_acm_write(&m_app_cdc_acm,
                                            m_nus_data_array,
                                            length);
    if(ret != NRF_SUCCESS)
    {
        NRF_LOG_INFO("CDC ACM unavailable, data received: %s", m_nus_data_array);
    }
}


/**@brief Callback handling Nordic UART Service (NUS) client events.
 *
 * @details This function is called to notify the application of NUS client events.
 *
 * @param[in]   p_ble_nus_c   NUS client handle. This identifies the NUS client.
 * @param[in]   p_ble_nus_evt Pointer to the NUS client event.
 */

/**@snippet [Handling events from the ble_nus_c module] */
static void ble_nus_c_evt_handler(ble_nus_c_t * p_ble_nus_c, ble_nus_c_evt_t const * p_ble_nus_evt)
{
    ret_code_t err_code;

    switch (p_ble_nus_evt->evt_type)
    {
        case BLE_NUS_C_EVT_DISCOVERY_COMPLETE:
            NRF_LOG_INFO("Discovery complete.");
            err_code = ble_nus_c_handles_assign(p_ble_nus_c, p_ble_nus_evt->conn_handle, &p_ble_nus_evt->handles);
            APP_ERROR_CHECK(err_code);

            err_code = ble_nus_c_tx_notif_enable(p_ble_nus_c);
            APP_ERROR_CHECK(err_code);
            NRF_LOG_INFO("Connected to device with Nordic UART Service.");
            break;

        case BLE_NUS_C_EVT_NUS_TX_EVT:
            ble_nus_chars_received_uart_print(p_ble_nus_evt->p_data, p_ble_nus_evt->data_len);
            break;

        case BLE_NUS_C_EVT_DISCONNECTED:
            NRF_LOG_INFO("Disconnected.");
            scan_start();
            break;
    }
}
/**@snippet [Handling events from the ble_nus_c module] */


/**@brief Function for initializing the Nordic UART Service (NUS) client. */
static void nus_c_init(void)
{
    ret_code_t       err_code;
    ble_nus_c_init_t init;

    init.evt_handler = ble_nus_c_evt_handler;
    init.error_handler = nus_error_handler;
    init.p_gatt_queue  = &m_ble_gatt_queue;

    err_code = ble_nus_c_init(&m_ble_nus_c, &init);
    APP_ERROR_CHECK(err_code);
}


/**
 * @brief Function for putting the chip into sleep mode.
 *
 * @note This function does not return.
 */
static void sleep_mode_enter(void)
{
    uint32_t err_code = bsp_indication_set(BSP_INDICATE_IDLE);
    APP_ERROR_CHECK(err_code);

    // Prepare wakeup buttons.
    err_code = bsp_btn_ble_sleep_mode_prepare();
    APP_ERROR_CHECK(err_code);

    // Go to system-off mode (this function will not return; wakeup will cause a reset).
    err_code = sd_power_system_off();
    APP_ERROR_CHECK(err_code);
}


/**
 * @brief Function for handling BLE events.
 *
 * @param[in]   p_ble_evt   Bluetooth stack event.
 * @param[in]   p_context   Unused.
 */
static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
    uint32_t err_code;
    ble_gap_evt_t const * p_gap_evt = &p_ble_evt->evt.gap_evt;

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            NRF_LOG_INFO("BLE NUS Central connected");
            err_code = ble_nus_c_handles_assign(&m_ble_nus_c, p_ble_evt->evt.gap_evt.conn_handle, NULL);
            APP_ERROR_CHECK(err_code);

            err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
            APP_ERROR_CHECK(err_code);

            // start discovery of services. The NUS Client waits for a discovery result
            err_code = ble_db_discovery_start(&m_db_disc, p_ble_evt->evt.gap_evt.conn_handle);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_GAP_EVT_DISCONNECTED:
            NRF_LOG_INFO("BLE NUS Central disconnected");
            break;

        case BLE_GAP_EVT_PHY_UPDATE_REQUEST:
        {
            NRF_LOG_DEBUG("PHY update request.");
            ble_gap_phys_t const phys =
            {
                .rx_phys = BLE_GAP_PHY_AUTO,
                .tx_phys = BLE_GAP_PHY_AUTO,
            };
            err_code = sd_ble_gap_phy_update(p_ble_evt->evt.gap_evt.conn_handle, &phys);
            APP_ERROR_CHECK(err_code);
        } break;

        case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
            // Pairing not supported.
            err_code = sd_ble_gap_sec_params_reply(p_ble_evt->evt.gap_evt.conn_handle, BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP, NULL, NULL);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_GAP_EVT_DATA_LENGTH_UPDATE_REQUEST:
        {
            ble_gap_data_length_params_t dl_params;

            // Clearing the struct will effectively set members to @ref BLE_GAP_DATA_LENGTH_AUTO.
            memset(&dl_params, 0, sizeof(ble_gap_data_length_params_t));
            err_code = sd_ble_gap_data_length_update(p_ble_evt->evt.gap_evt.conn_handle, &dl_params, NULL);
            APP_ERROR_CHECK(err_code);
        } break;

        case BLE_GATTC_EVT_TIMEOUT:
            // Disconnect on GATT Client timeout event.
            err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gattc_evt.conn_handle,
                                             BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_GATTS_EVT_TIMEOUT:
            // Disconnect on GATT Server timeout event.
            err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gatts_evt.conn_handle,
                                             BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_EVT_USER_MEM_REQUEST:
            err_code = sd_ble_user_mem_reply(p_ble_evt->evt.gattc_evt.conn_handle, NULL);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST:
        {
            ble_gatts_evt_rw_authorize_request_t  req;
            ble_gatts_rw_authorize_reply_params_t auth_reply;

            req = p_ble_evt->evt.gatts_evt.params.authorize_request;

            if (req.type != BLE_GATTS_AUTHORIZE_TYPE_INVALID)
            {
                if ((req.request.write.op == BLE_GATTS_OP_PREP_WRITE_REQ)     ||
                    (req.request.write.op == BLE_GATTS_OP_EXEC_WRITE_REQ_NOW) ||
                    (req.request.write.op == BLE_GATTS_OP_EXEC_WRITE_REQ_CANCEL))
                {
                    if (req.type == BLE_GATTS_AUTHORIZE_TYPE_WRITE)
                    {
                        auth_reply.type = BLE_GATTS_AUTHORIZE_TYPE_WRITE;
                    }
                    else
                    {
                        auth_reply.type = BLE_GATTS_AUTHORIZE_TYPE_READ;
                    }
                    auth_reply.params.write.gatt_status = APP_FEATURE_NOT_SUPPORTED;
                    err_code = sd_ble_gatts_rw_authorize_reply(p_ble_evt->evt.gatts_evt.conn_handle,
                                                               &auth_reply);
                    APP_ERROR_CHECK(err_code);
                }
            }
        } break; // BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST

        //* Billy try
        case BLE_GAP_EVT_ADV_REPORT: 
        {            
            size_t size;
            ret_code_t ret;

            size = sprintf(m_test_buffer, "PEER_ADDR:%x\r\n", p_gap_evt->params.adv_report.peer_addr.addr);
            ret = app_usbd_cdc_acm_write(&m_app_cdc_acm, m_test_buffer, size); 
            
            //size = sprintf(m_test_buffer, "DIRECT_ADDR:%s\r\n", p_gap_evt->params.adv_report.direct_addr.addr);
            //ret = app_usbd_cdc_acm_write(&m_app_cdc_acm, m_test_buffer, size); 

        } break; 

        default:
            // No implementation needed.
            break;
    }
}


/**
 * @brief Function for the SoftDevice initialization.
 *
 * @details This function initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    ret_code_t err_code;

    err_code = nrf_sdh_enable_request();
    APP_ERROR_CHECK(err_code);

    // Configure the BLE stack using the default settings.
    // Fetch the start address of the application RAM.
    uint32_t ram_start = 0;
    err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
    APP_ERROR_CHECK(err_code);

    // Enable BLE stack.
    err_code = nrf_sdh_ble_enable(&ram_start);
    APP_ERROR_CHECK(err_code);

    // Register a handler for BLE events.
    NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
}


/** @brief Function for handling events from the GATT library. */
void gatt_evt_handler(nrf_ble_gatt_t * p_gatt, nrf_ble_gatt_evt_t const * p_evt)
{
    if (p_evt->evt_id == NRF_BLE_GATT_EVT_ATT_MTU_UPDATED)
    {
        NRF_LOG_INFO("ATT MTU exchange completed.");

        m_ble_nus_max_data_len = p_evt->params.att_mtu_effective - OPCODE_LENGTH - HANDLE_LENGTH;
        NRF_LOG_INFO("Ble NUS max data length set to 0x%X(%d)", m_ble_nus_max_data_len, m_ble_nus_max_data_len);
    }
}


/** @brief Function for initializing the GATT library. */
void gatt_init(void)
{
    ret_code_t err_code;

    err_code = nrf_ble_gatt_init(&m_gatt, gatt_evt_handler);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_ble_gatt_att_mtu_periph_set(&m_gatt, NRF_SDH_BLE_GATT_MAX_MTU_SIZE);
    APP_ERROR_CHECK(err_code);
}


/**
 * @brief Function for handling events from the BSP module.
 *
 * @param[in]   event   Event generated by button press.
 */
void bsp_event_handler(bsp_event_t event)
{
    uint32_t err_code;
    switch (event)
    {
        case BSP_EVENT_SLEEP:
            sleep_mode_enter();
            break;

        case BSP_EVENT_DISCONNECT:
            err_code = sd_ble_gap_disconnect(m_ble_nus_c.conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            if (err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
            break;

        case BSP_EVENT_WHITELIST_OFF:
            break;

        default:
            break;
    }
}


/** @brief Function for initializing buttons and LEDs. */
static void buttons_leds_init(void)
{
    uint32_t err_code = bsp_init(BSP_INIT_LEDS, bsp_event_handler);
    APP_ERROR_CHECK(err_code);
}


/** @brief Function for initializing the nrf_log module. */
static void log_init(void)
{
    ret_code_t err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_DEFAULT_BACKENDS_INIT();
}


/** @brief Function for placing the application in low power state while waiting for events. */
static void power_manage(void)
{
    uint32_t err_code = sd_app_evt_wait();
    APP_ERROR_CHECK(err_code);
}


/**
 * @brief Function for handling the idle state (main loop).
 *
 * @details If there is no pending log operation, then sleep until next the next event occurs.
 */
static void idle_state_handle(void)
{
    UNUSED_RETURN_VALUE(NRF_LOG_PROCESS());
    power_manage();
}


// USB CODE START
static bool m_usb_connected = false;


/** @brief User event handler @ref app_usbd_cdc_acm_user_ev_handler_t */
static void cdc_acm_user_ev_handler(app_usbd_class_inst_t const * p_inst,
                                    app_usbd_cdc_acm_user_event_t event)
{
    app_usbd_cdc_acm_t const * p_cdc_acm = app_usbd_cdc_acm_class_get(p_inst);

    switch (event)
    {
        case APP_USBD_CDC_ACM_USER_EVT_PORT_OPEN:
        {
            /*Set up the first transfer*/
            ret_code_t ret = app_usbd_cdc_acm_read(&m_app_cdc_acm,
                                                   m_cdc_data_array,
                                                   1);
            UNUSED_VARIABLE(ret);
            ret = app_timer_stop(m_blink_cdc);
            APP_ERROR_CHECK(ret);
            bsp_board_led_on(LED_CDC_ACM_CONN);
            NRF_LOG_INFO("CDC ACM port opened");
            break;
        }

        case APP_USBD_CDC_ACM_USER_EVT_PORT_CLOSE:
            NRF_LOG_INFO("CDC ACM port closed");
            if (m_usb_connected)
            {
                ret_code_t ret = app_timer_start(m_blink_cdc,
                                                 APP_TIMER_TICKS(LED_BLINK_INTERVAL),
                                                 (void *) LED_CDC_ACM_CONN);
                APP_ERROR_CHECK(ret);
            }
            break;

        case APP_USBD_CDC_ACM_USER_EVT_TX_DONE:
            break;

        // v0.03  Command function
        case APP_USBD_CDC_ACM_USER_EVT_RX_DONE:
        {
            ret_code_t ret;

            do
            {
                /*Get amount of data transfered*/
                size_t size = app_usbd_cdc_acm_rx_size(p_cdc_acm);
                NRF_LOG_INFO("RX: size: %lu char: %c", size, m_rx_buffer[0]);

                /* Fetch data until internal buffer is empty */
                ret = app_usbd_cdc_acm_read(&m_app_cdc_acm,
                                            m_rx_buffer,
                                            READ_SIZE);
            }
            while (ret == NRF_SUCCESS);

            Command();
            break;
        }
        default:
            break;
    }
}

static void usbd_user_ev_handler(app_usbd_event_type_t event)
{
    switch (event)
    {
        case APP_USBD_EVT_DRV_SUSPEND:
            break;

        case APP_USBD_EVT_DRV_RESUME:
            break;

        case APP_USBD_EVT_STARTED:
            break;

        case APP_USBD_EVT_STOPPED:
            app_usbd_disable();
            break;

        case APP_USBD_EVT_POWER_DETECTED:
            NRF_LOG_INFO("USB power detected");

            if (!nrf_drv_usbd_is_enabled())
            {
                app_usbd_enable();
            }
            break;

        case APP_USBD_EVT_POWER_REMOVED:
        {
            NRF_LOG_INFO("USB power removed");
            ret_code_t err_code = app_timer_stop(m_blink_cdc);
            APP_ERROR_CHECK(err_code);
            bsp_board_led_off(LED_CDC_ACM_CONN);
            m_usb_connected = false;
            app_usbd_stop();
        }
            break;

        case APP_USBD_EVT_POWER_READY:
        {
            NRF_LOG_INFO("USB ready");
            ret_code_t err_code = app_timer_start(m_blink_cdc,
                                                  APP_TIMER_TICKS(LED_BLINK_INTERVAL),
                                                  (void *) LED_CDC_ACM_CONN);
            APP_ERROR_CHECK(err_code);
            m_usb_connected = true;
            app_usbd_start();
        }
            break;

        default:
            break;
    }
}

// USB CODE END

/** @brief Function for initializing the database discovery module. */
static void db_discovery_init(void)
{
    ble_db_discovery_init_t db_init;

    memset(&db_init, 0, sizeof(ble_db_discovery_init_t));

    db_init.evt_handler  = db_disc_handler;
    db_init.p_gatt_queue = &m_ble_gatt_queue;

    ret_code_t err_code = ble_db_discovery_init(&db_init);
    APP_ERROR_CHECK(err_code);
}

/** @brief Application main function. */
int main(void)
{
    ret_code_t ret;
    static const app_usbd_config_t usbd_config = {
        .ev_state_proc = usbd_user_ev_handler
    };
    // Initialize.
    log_init();
    timers_init();

    buttons_leds_init();

    app_usbd_serial_num_generate();

    ret = nrf_drv_clock_init();
    APP_ERROR_CHECK(ret);

    NRF_LOG_INFO("USBD BLE UART Central example started.");

    ret = app_usbd_init(&usbd_config);
    APP_ERROR_CHECK(ret);

    app_usbd_class_inst_t const * class_cdc_acm = app_usbd_cdc_acm_class_inst_get(&m_app_cdc_acm);
    ret = app_usbd_class_append(class_cdc_acm);
    APP_ERROR_CHECK(ret);

    db_discovery_init();

    ble_stack_init();
    gap_params_init();
    gatt_init();

    nus_c_init();
    scan_init();    

    ret = app_usbd_power_events_enable();
    APP_ERROR_CHECK(ret);

    // Enter main loop.
    for (;;)
    {
        while (app_usbd_event_queue_process())
        {
            /* Nothing to do */
        }
        idle_state_handle();
    }
}

/**
 * @}
 */

[Simonr]

Do you have multiple advertising devices actually advertising to this or just the one? Also, do you update the data in the BLE_GAP_EVT_ADV_REPORT between each print to make sure you allow for more than the same being printed again and again.

Best regards,

Simon