Problem in jumping from application to bootloader

Question

Dear team, Device - nRF52832 SDK - SDK_15.0.0 IDE - Segger Embedded studio Softdevice - s132_nrf52_6.0.0 I am doing buttonless DFU in my application. I have successfully build the secure bootloader code and also jump from bootloader to application by following your guidelines. 
 The problem is that When i tried to jump from application to bootloader it causes "GATT connection timeout" error. I have seen this error in nrfconnect android application. But when i remove "CONFIG_AS_GPIO_PINRESET" macro in both codes bootloader and application then everything works perfectly. I don't want to remove this macro but want some another solution . Please guide me on the same. Your quick reply would be highly appreciated. Thanks.

Prajapati · Accepted Answer

Fullscreen ble_dfu_unbonded.c Download

/**
 * Copyright (c) 2017 - 2018, Nordic Semiconductor ASA
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 * 
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 * 
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
 * 
 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
 * 
 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 */

#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>
#include "nrf_dfu_ble_svci_bond_sharing.h"
#include "nordic_common.h"
#include "nrf_error.h"
#include "ble_dfu.h"
#include "nrf_log.h"
#include "nrf_sdh_soc.h"
#include "nrf_gpio.h"
#include "nrf_delay.h"

#if (!NRF_DFU_BLE_BUTTONLESS_SUPPORTS_BONDS)

#define NRF_DFU_ADV_NAME_MAX_LENGTH     (20)


void ble_dfu_buttonless_on_sys_evt(uint32_t, void * );
uint32_t nrf_dfu_svci_vector_table_set(void);
uint32_t nrf_dfu_svci_vector_table_unset(void);

/**@brief Define functions for async interface to set new advertisement name for DFU mode.  */
NRF_SVCI_ASYNC_FUNC_DEFINE(NRF_DFU_SVCI_SET_ADV_NAME, nrf_dfu_set_adv_name, nrf_dfu_adv_name_t);

// Register SoC observer for the Buttonless Secure DFU service
NRF_SDH_SOC_OBSERVER(m_dfu_buttonless_soc_obs, BLE_DFU_SOC_OBSERVER_PRIO, ble_dfu_buttonless_on_sys_evt, NULL);

ble_dfu_buttonless_t      * mp_dfu = NULL;
static nrf_dfu_adv_name_t   m_adv_name;

//extern bool ResetPinDisable;


/**@brief Function for setting an advertisement name.
 *
 * @param[in]   adv_name    The new advertisement name.
 *
 * @retval NRF_SUCCESS      Advertisement name was successfully set.
 * @retval DFU_RSP_BUSY     Advertisement name was not set because of an ongoing operation.
 * @retval Any other errors from the SVCI interface call.
 */
static uint32_t set_adv_name(nrf_dfu_adv_name_t * p_adv_name)
{
    uint32_t err_code;

    if (mp_dfu->is_waiting_for_svci)
    {
        return DFU_RSP_BUSY;
    }

    err_code = nrf_dfu_set_adv_name(p_adv_name);
    if (err_code == NRF_SUCCESS)
    {
        // The request was accepted.
        mp_dfu->is_waiting_for_svci = true;
    }
    else if (err_code == NRF_ERROR_FORBIDDEN)
    {
        NRF_LOG_ERROR("The bootloader has write protected its settings page. This prohibits setting the advertising name. "\
                      "The bootloader must be compiled with NRF_BL_SETTINGS_PAGE_PROTECT=0 to allow setting the advertising name.");
    }

    return err_code;
}


/**@brief Function for entering the bootloader.
 */
static uint32_t enter_bootloader()
{
    uint32_t err_code;

    if (mp_dfu->is_waiting_for_svci)
    {
        // We have an ongoing async operation. Entering bootloader mode is not possible at this time.
        err_code = ble_dfu_buttonless_resp_send(DFU_OP_ENTER_BOOTLOADER, DFU_RSP_BUSY);
        if (err_code != NRF_SUCCESS)
        {
            mp_dfu->evt_handler(BLE_DFU_EVT_RESPONSE_SEND_ERROR);

        }
        
        return NRF_SUCCESS;
    }

    // Set the flag indicating that we expect DFU mode.
    // This will be handled on acknowledgement of the characteristic indication.
    mp_dfu->is_waiting_for_reset = true;

    err_code = ble_dfu_buttonless_resp_send(DFU_OP_ENTER_BOOTLOADER, DFU_RSP_SUCCESS);
    if (err_code != NRF_SUCCESS)
    {
        mp_dfu->is_waiting_for_reset = false;
    }
    
    return err_code;
}


uint32_t ble_dfu_buttonless_backend_init(ble_dfu_buttonless_t * p_dfu)
{
    VERIFY_PARAM_NOT_NULL(p_dfu);

    mp_dfu = p_dfu;

    return NRF_SUCCESS;
}


uint32_t ble_dfu_buttonless_async_svci_init(void)
{
    uint32_t ret_val;

    ret_val = nrf_dfu_svci_vector_table_set();
    VERIFY_SUCCESS(ret_val);

    ret_val = nrf_dfu_set_adv_name_init();
    VERIFY_SUCCESS(ret_val);

    ret_val = nrf_dfu_svci_vector_table_unset();

    return ret_val;
}


void ble_dfu_buttonless_on_sys_evt(uint32_t sys_evt, void * p_context)
{
    uint32_t err_code;

    if (!nrf_dfu_set_adv_name_is_initialized())
    {
        return;
    }

    err_code = nrf_dfu_set_adv_name_on_sys_evt(sys_evt);
    if (err_code == NRF_ERROR_INVALID_STATE)
    {
        // The system event is not from an operation started by buttonless DFU.
        // No action is taken, and nothing is reported.
    }
    else if (err_code == NRF_SUCCESS)
    {
        // The async operation is finished.
        // Set the flag indicating that we are waiting for indication response
        // to activate the reset.
        mp_dfu->is_waiting_for_svci = false;

        // Report back the positive response
        err_code = ble_dfu_buttonless_resp_send(DFU_OP_SET_ADV_NAME, DFU_RSP_SUCCESS);
        if (err_code != NRF_SUCCESS)
        {
            mp_dfu->evt_handler(BLE_DFU_EVT_RESPONSE_SEND_ERROR);
        }
    }
    else
    {
        // Invalid error code reported back.
        mp_dfu->is_waiting_for_svci = false;

        err_code = ble_dfu_buttonless_resp_send(DFU_OP_SET_ADV_NAME, DFU_RSP_BUSY);
        if (err_code != NRF_SUCCESS)
        {
            mp_dfu->evt_handler(BLE_DFU_EVT_RESPONSE_SEND_ERROR);
        }

        // Report the failure to enter DFU mode
        mp_dfu->evt_handler(BLE_DFU_EVT_BOOTLOADER_ENTER_FAILED);
    }
}


uint32_t ble_dfu_buttonless_char_add(ble_dfu_buttonless_t * p_dfu)
{
    ble_gatts_char_md_t char_md         = {{0}};
    ble_gatts_attr_md_t cccd_md         = {{0}};
    ble_gatts_attr_t    attr_char_value = {0};
    ble_gatts_attr_md_t attr_md         = {{0}};
    ble_uuid_t          char_uuid;


    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.write_perm);

    cccd_md.vloc = BLE_GATTS_VLOC_STACK;

    char_md.char_props.indicate     = 1;
    char_md.char_props.write        = 1;
    char_md.p_char_user_desc        = NULL;
    char_md.p_char_pf               = NULL;
    char_md.p_user_desc_md          = NULL;
    char_md.p_cccd_md               = &cccd_md;
    char_md.p_sccd_md               = NULL;

    char_uuid.type = p_dfu->uuid_type;
    char_uuid.uuid = BLE_DFU_BUTTONLESS_CHAR_UUID;

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);

    attr_md.vloc    = BLE_GATTS_VLOC_STACK;
    attr_md.rd_auth = 0;
    attr_md.wr_auth = 1;
    attr_md.vlen    = 1;

    attr_char_value.p_uuid    = &char_uuid;
    attr_char_value.p_attr_md = &attr_md;
    attr_char_value.init_len  = 0;
    attr_char_value.init_offs = 0;
    attr_char_value.max_len   = BLE_GATT_ATT_MTU_DEFAULT;
    attr_char_value.p_value   = 0;

    return sd_ble_gatts_characteristic_add(p_dfu->service_handle,
                                           &char_md,
                                           &attr_char_value,
                                           &p_dfu->control_point_char);
}


void ble_dfu_buttonless_on_ctrl_pt_write(ble_gatts_evt_write_t const * p_evt_write)
{
    uint32_t err_code;
    ble_dfu_buttonless_rsp_code_t rsp_code = DFU_RSP_OPERATION_FAILED;

    // Start executing the control point write operation
    /*lint -e415 -e416 -save "Out of bounds access"*/
    switch (p_evt_write->data[0])
    {
        case DFU_OP_ENTER_BOOTLOADER:
//              nrf_gpio_cfg_output(29);
//              nrf_gpio_pin_set(29);
//              nrf_delay_ms(2000);
              err_code = enter_bootloader();
           if (err_code == NRF_SUCCESS)
            {
                rsp_code = DFU_RSP_SUCCESS;
                //nrf_gpio_cfg_output(4);
                //nrf_gpio_pin_set(4);
                
            }
            else if (err_code == NRF_ERROR_BUSY)
            {
                rsp_code = DFU_RSP_BUSY;
                /*nrf_gpio_cfg_output(4);
                nrf_gpio_pin_set(4);*/
            }
            //break;

        case DFU_OP_SET_ADV_NAME:
            if(    (p_evt_write->data[1] > NRF_DFU_ADV_NAME_MAX_LENGTH)
                || (p_evt_write->data[1] == 0))
            {
                // New advertisement name too short or too long.
                rsp_code = DFU_RSP_ADV_NAME_INVALID;
                
            }
            else
            {
                memcpy(m_adv_name.name, &p_evt_write->data[2], p_evt_write->data[1]);
                m_adv_name.len = p_evt_write->data[1];
                err_code = set_adv_name(&m_adv_name);
                if (err_code == NRF_SUCCESS)
                {
                    rsp_code = DFU_RSP_SUCCESS;
                }
            }
            break;

        default:
            rsp_code = DFU_RSP_OP_CODE_NOT_SUPPORTED;
            break;
    }
    /*lint -restore*/


    // Report back in case of error
    if (rsp_code != DFU_RSP_SUCCESS)
    {
        err_code = ble_dfu_buttonless_resp_send((ble_dfu_buttonless_op_code_t)p_evt_write->data[0], rsp_code);
        if (err_code != NRF_SUCCESS)
        {
            mp_dfu->evt_handler(BLE_DFU_EVT_RESPONSE_SEND_ERROR);

        }
        // Report the error to the main application
        mp_dfu->evt_handler(BLE_DFU_EVT_BOOTLOADER_ENTER_FAILED);
    }
}

uint32_t ble_dfu_buttonless_bootloader_start_prepare(void)
{
    uint32_t err_code;

    
    //nrf_delay_ms(10);

    // Indicate to main app that DFU mode is starting.
    mp_dfu->evt_handler(BLE_DFU_EVT_BOOTLOADER_ENTER_PREPARE);

    err_code = ble_dfu_buttonless_bootloader_start_finalize();
    //ResetPinDisable = true;
    return err_code;

}

#endif // NRF_DFU_BOTTONLESS_SUPPORT_BOND

Fullscreen ble_dfu.c Download

/**
 * Copyright (c) 2017 - 2018, Nordic Semiconductor ASA
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 * 
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 * 
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
 * 
 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
 * 
 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 */
/* Attention!
 *  To maintain compliance with Nordic Semiconductor ASA's Bluetooth profile
 *  qualification listings, this section of source code must not be modified.
 */

#include "ble_dfu.h"
#include <string.h>
#include "ble_hci.h"
#include "sdk_macros.h"
#include "ble_srv_common.h"
#include "nrf_nvic.h"
#include "nrf_sdm.h"
#include "nrf_soc.h"
#include "nrf_log.h"
#include "nrf_dfu_ble_svci_bond_sharing.h"
#include "nrf_bootloader_info.h"
#include "nrf_svci_async_function.h"
#include "nrf_pwr_mgmt.h"
#include "peer_manager.h"
#include "gatts_cache_manager.h"
#include "peer_id.h"
#include "nrf_gpio.h"
#include "nrf_delay.h"

#define MAX_CTRL_POINT_RESP_PARAM_LEN   3                           /**< Max length of the responses. */

#define BLE_DFU_SERVICE_UUID            0xFE59                      /**< The 16-bit UUID of the Secure DFU Service. */

static ble_dfu_buttonless_t             m_dfu;                      /**< Structure holding information about the Buttonless Secure DFU Service. */
//extern bool ResetPinDisable;
NRF_SDH_BLE_OBSERVER(m_dfus_obs, BLE_DFU_BLE_OBSERVER_PRIO, ble_dfu_buttonless_on_ble_evt, &m_dfu);

/**@brief Function for handling write events to the Buttonless Secure DFU Service Service Control Point characteristic.
 *
 * @param[in]   p_evt_write   Write event received from the BLE stack.
 */
static void on_ctrlpt_write(ble_gatts_evt_write_t const * p_evt_write)
{
    uint32_t      err_code;


    ble_gatts_rw_authorize_reply_params_t write_authorize_reply;
    memset(&write_authorize_reply, 0, sizeof(write_authorize_reply));

    write_authorize_reply.type   = BLE_GATTS_AUTHORIZE_TYPE_WRITE;

    if (m_dfu.is_ctrlpt_indication_enabled)
    {
        write_authorize_reply.params.write.update      = 1;
        write_authorize_reply.params.write.gatt_status = BLE_GATT_STATUS_SUCCESS;
    }
    else
    {
        write_authorize_reply.params.write.gatt_status = DFU_RSP_CCCD_CONFIG_IMPROPER;
    }

    // Authorize the write request
    do {
        err_code = sd_ble_gatts_rw_authorize_reply(m_dfu.conn_handle, &write_authorize_reply);
    } while (err_code == NRF_ERROR_BUSY);


    if (write_authorize_reply.params.write.gatt_status != BLE_GATT_STATUS_SUCCESS)
    {
        return;
    }

    // Forward the write event to the Buttonless DFU module.
    ble_dfu_buttonless_on_ctrl_pt_write(p_evt_write);
}


/**@brief Write authorization request event handler.
 *
 * @details The write authorization request event handler is called when writing to the control point.
 *
 * @param[in]   p_ble_evt Event received from the BLE stack.
 */
static void on_rw_authorize_req(ble_evt_t const * p_ble_evt)
{
    if (p_ble_evt->evt.gatts_evt.conn_handle != m_dfu.conn_handle)
    {
        return;
    }

    const ble_gatts_evt_rw_authorize_request_t * p_auth_req =
        &p_ble_evt->evt.gatts_evt.params.authorize_request;

    if (
        (p_auth_req->type == BLE_GATTS_AUTHORIZE_TYPE_WRITE)                            &&
        (p_auth_req->request.write.handle == m_dfu.control_point_char.value_handle)     &&
        (p_auth_req->request.write.op != BLE_GATTS_OP_PREP_WRITE_REQ)                   &&
        (p_auth_req->request.write.op != BLE_GATTS_OP_EXEC_WRITE_REQ_NOW)               &&
        (p_auth_req->request.write.op != BLE_GATTS_OP_EXEC_WRITE_REQ_CANCEL)
       )
    {
        on_ctrlpt_write(&p_auth_req->request.write);
    }
}


/**@brief Connect event handler.
 *
 * @param[in]   p_ble_evt   Event received from the BLE stack.
 */
static void on_connect(ble_evt_t const * p_ble_evt)
{
    m_dfu.conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
}


/**@brief Disconnect event handler.
 *
 * @param[in]   p_ble_evt   Event received from the BLE stack.
 */
static void on_disconnect(ble_evt_t const * p_ble_evt)
{
    if (m_dfu.conn_handle != p_ble_evt->evt.gatts_evt.conn_handle)
    {
        return;
    }

    m_dfu.conn_handle = BLE_CONN_HANDLE_INVALID;
}


/**@brief Write event handler.
 *
 * @param[in]   p_ble_evt Event received from the BLE stack.
 */
static void on_write(ble_evt_t const * p_ble_evt)
{
    const ble_gatts_evt_write_t * p_evt_write = &p_ble_evt->evt.gatts_evt.params.write;

//    nrf_gpio_cfg_output(29);
//    nrf_gpio_pin_set(29);
//    nrf_delay_ms(300);

    if (p_evt_write->handle != m_dfu.control_point_char.cccd_handle)
    {
        return;
    }

    if (p_evt_write->len == BLE_CCCD_VALUE_LEN)
    {
        // CCCD written, update indications state
         m_dfu.is_ctrlpt_indication_enabled = ble_srv_is_indication_enabled(p_evt_write->data);
         
         NRF_LOG_INFO("Received indication state %d",
                      m_dfu.is_ctrlpt_indication_enabled);
    }
}


/**@brief Function for handling the HVC events.
 *
 * @details Handles HVC events from the BLE stack.
 *
 * @param[in] p_ble_evt  Event received from the BLE stack.
 */
static void on_hvc(ble_evt_t const * p_ble_evt)
{
    uint32_t err_code;
    ble_gatts_evt_hvc_t const * p_hvc = &p_ble_evt->evt.gatts_evt.params.hvc;
//    nrf_gpio_cfg_output(29);
//    nrf_gpio_pin_set(29);
//    nrf_delay_ms(300);

    if (p_hvc->handle == m_dfu.control_point_char.value_handle)
    {

        // Enter bootloader if we were waiting for reset after hvc indication confimation.
        if (m_dfu.is_waiting_for_reset)
        {
            err_code = ble_dfu_buttonless_bootloader_start_prepare();
            if (err_code != NRF_SUCCESS)
            {
                m_dfu.evt_handler(BLE_DFU_EVT_BOOTLOADER_ENTER_FAILED);
            }
        }
    }
}


void ble_dfu_buttonless_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
{
    VERIFY_PARAM_NOT_NULL_VOID(p_ble_evt);

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            on_connect(p_ble_evt);
            break;

        case BLE_GAP_EVT_DISCONNECTED:
            on_disconnect(p_ble_evt);
            break;

        case BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST:

            on_rw_authorize_req(p_ble_evt);
            break;

        case BLE_GATTS_EVT_WRITE:

            on_write(p_ble_evt);
            break;

        case BLE_GATTS_EVT_HVC:

            on_hvc(p_ble_evt);
            break;

        default:
            // no implementation
            break;
    }
}


uint32_t ble_dfu_buttonless_resp_send(ble_dfu_buttonless_op_code_t op_code, ble_dfu_buttonless_rsp_code_t rsp_code)
{
    // Send notification
    uint32_t                err_code;
    const uint16_t          len = 3;
    uint16_t                hvx_len;
    uint8_t                 hvx_data[MAX_CTRL_POINT_RESP_PARAM_LEN];
    ble_gatts_hvx_params_t  hvx_params;
    

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

    hvx_len = len;
    hvx_data[0] = DFU_OP_RESPONSE_CODE;
    hvx_data[1] = (uint8_t)op_code;
    hvx_data[2] = (uint8_t)rsp_code;

    hvx_params.handle   = m_dfu.control_point_char.value_handle;
    hvx_params.type     = BLE_GATT_HVX_INDICATION;
    hvx_params.offset   = 0;
    hvx_params.p_len    = &hvx_len;
    hvx_params.p_data   = hvx_data;


    err_code = sd_ble_gatts_hvx(m_dfu.conn_handle, &hvx_params);
    if ((err_code == NRF_SUCCESS) && (hvx_len != len))
    {
        err_code = NRF_ERROR_DATA_SIZE;
    }

    return err_code;
}


uint32_t ble_dfu_buttonless_bootloader_start_finalize(void)
{
    uint32_t err_code;

    NRF_LOG_DEBUG("In ble_dfu_buttonless_bootloader_start_finalize\r\n");
    

    err_code = sd_power_gpregret_clr(0, 0xffffffff);
    VERIFY_SUCCESS(err_code);

  
    err_code = sd_power_gpregret_set(0, BOOTLOADER_DFU_START);
    VERIFY_SUCCESS(err_code);

    // Indicate that the Secure DFU bootloader will be entered
    m_dfu.evt_handler(BLE_DFU_EVT_BOOTLOADER_ENTER);
    
//    nrf_gpio_pin_clear(4);
    // Signal that DFU mode is to be enter to the power management module

    
    
    nrf_pwr_mgmt_shutdown(NRF_PWR_MGMT_SHUTDOWN_GOTO_DFU);
    
    //NVIC_SystemReset();
    return NRF_SUCCESS;
}


uint32_t ble_dfu_buttonless_init(const ble_dfu_buttonless_init_t * p_dfu_init)
{
    uint32_t        err_code;
    ble_uuid_t      service_uuid;
    ble_uuid128_t   nordic_base_uuid = BLE_NORDIC_VENDOR_BASE_UUID;

    VERIFY_PARAM_NOT_NULL(p_dfu_init);

    // Initialize the service structure.
    m_dfu.conn_handle                  = BLE_CONN_HANDLE_INVALID;
    m_dfu.evt_handler                  = p_dfu_init->evt_handler;
    m_dfu.is_waiting_for_reset         = false;
    m_dfu.is_ctrlpt_indication_enabled = false;

    err_code = ble_dfu_buttonless_backend_init(&m_dfu);
    VERIFY_SUCCESS(err_code);
    
    BLE_UUID_BLE_ASSIGN(service_uuid, BLE_DFU_SERVICE_UUID);

    // Add the DFU service declaration.
    err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY,
                                        &service_uuid,
                                        &(m_dfu.service_handle));

    VERIFY_SUCCESS(err_code);

    // Add vendor specific base UUID to use with the Buttonless DFU characteristic.
    err_code = sd_ble_uuid_vs_add(&nordic_base_uuid, &m_dfu.uuid_type);
    VERIFY_SUCCESS(err_code);

    // Add the Buttonless DFU Characteristic (with bonds/without bonds).
    err_code = ble_dfu_buttonless_char_add(&m_dfu);
    VERIFY_SUCCESS(err_code);

    return NRF_SUCCESS;
}

Yes I am using custom board. I am attaching ble_dfu.c and ble_dfu_unbounded.c files of my application code. i have not make any changed in both files. One more thing , What is the need of making reset pin low during jumping from application to bootloader?

Problem in jumping from application to bootloader

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