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Multiperipheral and bonding

Hi,

I try to activate the bonding with the "ble_app_multiperipheral" exemple project I have modified.

It is very strange because I can bond as wanted but only if I set, in the "peer_manager_init" function "sec_param.bond" value to false.

Normally, and accordly to the documentation :

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v11.0.0%2Flib_pm_usage.html

this parameter has to be "true" and all the "kdist_***" parameters have to be set to "1".

In 2 sentences :

1) If I follow the documentation and set all the security parameters for "Pairing, no bonding", I can bond

2) If I follow the documentation and set all the security parameters for "Just Works bonding", I cannot bond and have a "Fatal error" when bonding

What the hell I have not done correctly?

Thanks in advance for any help.

PS : attached my sdk_config and my main cource code.

sdk_config.h

/**
 * Copyright (c) 2015 - 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.
 * 
 */

/**
 * @brief Multiperipheral Sample Application main file.
 *
 * This file contains the source code for a sample server application with multiple peripheral connections using the LED Button service.
 */

#include <stdint.h>
#include <string.h>
#include "nordic_common.h"
#include "nrf.h"
#include "boards.h"
#include "app_error.h"
#include "ble.h"
#include "ble_err.h"
#include "ble_hci.h"
#include "ble_srv_common.h"
#include "ble_advdata.h"
#include "ble_dis.h"
#include "ble_conn_params.h"
#include "ble_conn_state.h"
#include "nrf_gpio.h"
#include "nrf_sdh.h"
#include "nrf_sdh_ble.h"
#include "app_timer.h"
#include "app_button.h"
#include "ble_lbs.h"
#include "nrf_ble_gatt.h"
#include "nrf_ble_qwr.h"
#include "nrf_pwr_mgmt.h"
#include "door_service.h"
#include "fds.h"
#include "peer_manager.h"

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


#define DEVICE_NAME                     "6@granois"                             /**< Name of device. Will be included in the advertising data. */
#define MANUFACTURER_NAME               "Fabien Duay"                           /**< Manufacturer. Will be passed to Device Information Service. */
#define HARDWARE_REVISION               "3"
#define SOFTWARE_REVISION               "2"

#define APP_BLE_CONN_CFG_TAG            1                                       /**< A tag identifying the SoftDevice BLE configuration. */
#define LINK_TOTAL                      NRF_SDH_BLE_PERIPHERAL_LINK_COUNT + \
                                        NRF_SDH_BLE_CENTRAL_LINK_COUNT

#define APP_ADV_INTERVAL                320                                     /**< The advertising interval (in units of 0.625 ms; this value corresponds to 40 ms). */
#define APP_ADV_DURATION                BLE_GAP_ADV_TIMEOUT_GENERAL_UNLIMITED   /**< The advertising duration (180 seconds) in units of 10 milliseconds. */

#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(100, UNIT_1_25_MS)        /**< Minimum acceptable connection interval (0.5 seconds). */
#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(200, UNIT_1_25_MS)        /**< Maximum acceptable connection interval (1 second). */
#define SLAVE_LATENCY                   0                                       /**< Slave latency. */
#define CONN_SUP_TIMEOUT                MSEC_TO_UNITS(4000, UNIT_10_MS)         /**< Connection supervisory time-out (4 seconds). */

#define RELAY_ACTIVATION_INTERVAL       APP_TIMER_TICKS(150)                    /**< RR interval interval (ticks). */
#define FIRST_CONN_PARAMS_UPDATE_DELAY  APP_TIMER_TICKS(20000)                  /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (15 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY   APP_TIMER_TICKS(5000)                   /**< Time between each call to sd_ble_gap_conn_param_update after the first call (5 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. */


/**@brief   Priority of the application BLE event handler.
 * @note    You shouldn't need to modify this value.
 */
#define APP_BLE_OBSERVER_PRIO    3

static uint8_t m_adv_handle = BLE_GAP_ADV_SET_HANDLE_NOT_SET;                   /**< Advertising handle used to identify an advertising set. */
static uint8_t m_enc_advdata[BLE_GAP_ADV_SET_DATA_SIZE_MAX];                    /**< Buffer for storing an encoded advertising set. */
static uint8_t m_enc_scan_response_data[BLE_GAP_ADV_SET_DATA_SIZE_MAX];         /**< Buffer for storing an encoded scan data. */

static ble_gap_sec_params_t sec_param;

/**@brief Struct that contains pointers to the encoded advertising data. */
static ble_gap_adv_data_t m_adv_data =
{
    .adv_data =
    {
        .p_data = m_enc_advdata,
        .len    = BLE_GAP_ADV_SET_DATA_SIZE_MAX
    },
    .scan_rsp_data =
    {
        .p_data = m_enc_scan_response_data,
        .len    = BLE_GAP_ADV_SET_DATA_SIZE_MAX

    }
};

APP_TIMER_DEF(close_door_timer);                                                /**< open/close door relay activation timer */

BLE_DS_DEF(m_ds);
NRF_BLE_GATT_DEF(m_gatt);                                                       /**< GATT module instance. */
NRF_BLE_QWRS_DEF(m_qwr, NRF_SDH_BLE_TOTAL_LINK_COUNT);                          /**< Context for the Queued Write module.*/

/**@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 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);
}


static void close_door_handler(void *p_context) {
  NRF_LOG_INFO("set pin low");
  nrf_gpio_pin_clear(RELAY_PIN);
}



/**@brief Function for the Timer initialization.
 *
 * @details Initializes the timer module.
 */
static void timers_init(void)
{
    // Initialize timer module, making it use the scheduler
    ret_code_t err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);

    err_code = app_timer_create(&close_door_timer, APP_TIMER_MODE_SINGLE_SHOT, close_door_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 including the device name, appearance, and the preferred connection parameters.
 */
static void gap_params_init(void)
{
    ret_code_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);
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&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 initializing the GATT module.
 */
static void gatt_init(void)
{
    ret_code_t err_code = nrf_ble_gatt_init(&m_gatt, NULL);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing the Advertising functionality.
 *
 * @details Encodes the required advertising data and passes it to the stack.
 *          Also builds a structure to be passed to the stack when starting advertising.
 */
static void advertising_init(void)
{
    ret_code_t           err_code;
    ble_advdata_t        advdata;
    ble_advdata_t        srdata;
    ble_gap_adv_params_t adv_params;


    ble_uuid_t adv_uuids[] = {{BLE_UUID_DOOR_SERVICE, m_ds.uuid_type}};

    // Build and set advertising data.
    memset(&advdata, 0, sizeof(advdata));

    advdata.name_type          = BLE_ADVDATA_FULL_NAME;
    advdata.include_appearance = true;
    advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;


    memset(&srdata, 0, sizeof(srdata));
    srdata.uuids_complete.uuid_cnt = sizeof(adv_uuids) / sizeof(adv_uuids[0]);
    srdata.uuids_complete.p_uuids  = adv_uuids;

    err_code = ble_advdata_encode(&advdata, m_adv_data.adv_data.p_data, &m_adv_data.adv_data.len);
    APP_ERROR_CHECK(err_code);

    err_code = ble_advdata_encode(&srdata, m_adv_data.scan_rsp_data.p_data, &m_adv_data.scan_rsp_data.len);
    APP_ERROR_CHECK(err_code);

    // Start advertising.
    memset(&adv_params, 0, sizeof(adv_params));
    adv_params.p_peer_addr   = NULL;
    adv_params.filter_policy = BLE_GAP_ADV_FP_ANY;
    adv_params.interval      = APP_ADV_INTERVAL;

    adv_params.properties.type = BLE_GAP_ADV_TYPE_CONNECTABLE_SCANNABLE_UNDIRECTED;
    adv_params.duration        = APP_ADV_DURATION;
    adv_params.primary_phy     = BLE_GAP_PHY_1MBPS;

    err_code = sd_ble_gap_adv_set_configure(&m_adv_handle, &m_adv_data, &adv_params);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling Queued Write Module errors.
 *
 * @details A pointer to this function will be passed to each service which may need to inform the
 *          application about an error.
 *
 * @param[in]   nrf_error   Error code containing information about what went wrong.
 */
static void nrf_qwr_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}



/**@brief Function for starting application timers.
 */
static void open_door(void)
{
    NRF_LOG_INFO("door opened");

    //activation of the relay
    NRF_LOG_INFO("set pin high");
    nrf_gpio_pin_set(RELAY_PIN);
    //nrf_delay_ms(150);
    //nrf_gpio_pin_clear(RELAY_PIN);

    // Start application timers to set the pin low
    uint32_t err_code = app_timer_start(close_door_timer, RELAY_ACTIVATION_INTERVAL, NULL);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing services that will be used by the application.
 */
static void services_init(void)
{
    ret_code_t         err_code;
    nrf_ble_qwr_init_t qwr_init = {0};

    // Initialize Queued Write Module instances.
    qwr_init.error_handler = nrf_qwr_error_handler;

    for (uint32_t i = 0; i < LINK_TOTAL; i++){
        err_code = nrf_ble_qwr_init(&m_qwr[i], &qwr_init);
        APP_ERROR_CHECK(err_code);
    }


    // Initialize door service
    ble_ds_init_t      ds_init;
    memset(&ds_init, 0, sizeof(ds_init));

    ds_init.open_handler        = open_handler;
    ds_init.key_handler         = key_handler;
    ds_init.action_execute      = open_door;

    err_code = ble_ds_init(&m_ds, &ds_init);
    APP_ERROR_CHECK(err_code);


    // Initialize Device Information Service.
    ble_dis_init_t     dis_init;
    memset(&dis_init, 0, sizeof(dis_init));

    ble_srv_ascii_to_utf8(&dis_init.manufact_name_str, (char *)MANUFACTURER_NAME);
    ble_srv_ascii_to_utf8(&dis_init.hw_rev_str, (char *)HARDWARE_REVISION);
    ble_srv_ascii_to_utf8(&dis_init.fw_rev_str, (char *)SOFTWARE_REVISION);  

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&dis_init.dis_attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&dis_init.dis_attr_md.write_perm);

    err_code = ble_dis_init(&dis_init);
    APP_ERROR_CHECK(err_code);

    ble_conn_state_init();
}


/**@brief Function for handling a Connection Parameters error.
 *
 * @param[in] nrf_error  Error code containing information about what went wrong.
 */
static void conn_params_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}


/**@brief Function for initializing the Connection Parameters module.
 */
static void conn_params_init(void)
{
    ret_code_t             err_code;
    ble_conn_params_init_t cp_init;

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

    cp_init.p_conn_params                  = NULL;
    cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
    cp_init.next_conn_params_update_delay  = NEXT_CONN_PARAMS_UPDATE_DELAY;
    cp_init.max_conn_params_update_count   = MAX_CONN_PARAMS_UPDATE_COUNT;
    cp_init.start_on_notify_cccd_handle    = BLE_GATT_HANDLE_INVALID;
    cp_init.disconnect_on_fail             = true;
    cp_init.error_handler                  = conn_params_error_handler;

    err_code = ble_conn_params_init(&cp_init);
    APP_ERROR_CHECK(err_code);
}




/**@brief Function for starting advertising.
 */
static void advertising_start(void)
{
    ret_code_t err_code;

    err_code = sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);

    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling Peer Manager events.
 *
 * @param[in] p_evt  Peer Manager event.
 */
static void pm_evt_handler(pm_evt_t const * p_evt)
{
    ret_code_t err_code;

    switch (p_evt->evt_id)
    {
        case PM_EVT_BONDED_PEER_CONNECTED:
            NRF_LOG_INFO("Connected to a previously bonded device.");
            break;

        case PM_EVT_CONN_SEC_SUCCEEDED:
            NRF_LOG_INFO("Connection secured. Role: %d. conn_handle: %d, Procedure: %d",
                         ble_conn_state_role(p_evt->conn_handle),
                         p_evt->conn_handle,
                         p_evt->params.conn_sec_succeeded.procedure);
            // Update the rank of the peer.
            //err_code = pm_peer_rank_highest(p_evt->peer_id);
            break;

        case PM_EVT_CONN_SEC_FAILED:
            // In some cases, when securing fails, it can be restarted directly. Sometimes it can be
            // restarted, but only after changing some Security Parameters. Sometimes, it cannot be
            // restarted until the link is disconnected and reconnected. Sometimes it is impossible
            // to secure the link, or the peer device does not support it. How to handle this error
            // is highly application-dependent.
            break;

        case PM_EVT_CONN_SEC_CONFIG_REQ:
        {
            // A connected peer (central) is trying to pair, but the Peer Manager already has a bond
            // for that peer. Setting allow_repairing to false rejects the pairing request.
            // If this event is ignored (pm_conn_sec_config_reply is not called in the event
            // handler), the Peer Manager assumes allow_repairing to be false.
            pm_conn_sec_config_t conn_sec_config = {.allow_repairing = false};
            pm_conn_sec_config_reply(p_evt->conn_handle, &conn_sec_config);
        }
        break;

        case PM_EVT_CONN_SEC_PARAMS_REQ:
        {
            // If you want to set different security parameters for particular peers, you can do
            // so here. Pass the desired security parameters to pm_conn_sec_params_reply().
            err_code = pm_conn_sec_params_reply(p_evt->conn_handle, &sec_param,
                                                p_evt->params.conn_sec_params_req.p_context);
            APP_ERROR_CHECK(err_code);
        } break;

        case PM_EVT_STORAGE_FULL:
        {
            // Run garbage collection on the flash.
            err_code = fds_gc();
            if (err_code == FDS_ERR_BUSY || err_code == FDS_ERR_NO_SPACE_IN_QUEUES)
            {
                // Retry.
            }
            else
            {
                APP_ERROR_CHECK(err_code);
            }
        } break;

        case PM_EVT_PEERS_DELETE_SUCCEEDED:
        {
            NRF_LOG_DEBUG("PM_EVT_PEERS_DELETE_SUCCEEDED");
            advertising_start();
         } break;

        case PM_EVT_PEER_DATA_UPDATE_FAILED:
        {
            // Assert.
            APP_ERROR_CHECK(p_evt->params.peer_data_update_failed.error);
        } break;

        case PM_EVT_PEER_DELETE_FAILED:
        {
            // Assert.
            APP_ERROR_CHECK(p_evt->params.peer_delete_failed.error);
        } break;

        case PM_EVT_PEERS_DELETE_FAILED:
        {
            // Assert.
            APP_ERROR_CHECK(p_evt->params.peers_delete_failed_evt.error);
        } break;

        case PM_EVT_ERROR_UNEXPECTED:
        {
            // Assert.
            APP_ERROR_CHECK(p_evt->params.error_unexpected.error);
        } break;

        case PM_EVT_LOCAL_DB_CACHE_APPLY_FAILED:
        {
            // The local database has likely changed, send service changed indications.
            pm_local_database_has_changed();
        } break;

        case PM_EVT_CONN_SEC_START:
        case PM_EVT_PEER_DATA_UPDATE_SUCCEEDED:
        case PM_EVT_PEER_DELETE_SUCCEEDED:
        case PM_EVT_LOCAL_DB_CACHE_APPLIED:
        case PM_EVT_SERVICE_CHANGED_IND_SENT:
        case PM_EVT_SERVICE_CHANGED_IND_CONFIRMED:
        default:
            break;
    }
}



/**@brief Function for the Peer Manager initialization.
 */
static void peer_manager_init(void)
{
    ret_code_t           err_code;

    err_code = pm_init();
    APP_ERROR_CHECK(err_code);

    memset(&sec_param, 0, sizeof(ble_gap_sec_params_t));

    // Security parameters to be used for all security procedures.
    sec_param.bond           = false;
    sec_param.mitm           = false;
    sec_param.lesc           = 0;
    sec_param.keypress       = 0;
    sec_param.io_caps        = BLE_GAP_IO_CAPS_NONE;
    sec_param.oob            = false;
    sec_param.min_key_size   = 7;
    sec_param.max_key_size   = 16;
    sec_param.kdist_own.enc  = 0;
    sec_param.kdist_own.id   = 0;
    sec_param.kdist_peer.enc = 0;
    sec_param.kdist_peer.id  = 0;

    err_code = pm_sec_params_set(&sec_param);
    APP_ERROR_CHECK(err_code);

    err_code = pm_register(pm_evt_handler);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling the Connected event.
 *
 * @param[in] p_gap_evt GAP event received from the BLE stack.
 */
static void on_connected(const ble_gap_evt_t * const p_gap_evt)
{
    ret_code_t  err_code;
    uint32_t    periph_link_cnt = ble_conn_state_peripheral_conn_count(); // Number of peripheral links.

    NRF_LOG_INFO("Connection with link 0x%x established.", p_gap_evt->conn_handle);

    // Assign connection handle to available instance of QWR module.
    for (uint32_t i = 0; i < NRF_SDH_BLE_PERIPHERAL_LINK_COUNT; ++i) {
        if (m_qwr[i].conn_handle == BLE_CONN_HANDLE_INVALID) {
            err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr[i], p_gap_evt->conn_handle);
            APP_ERROR_CHECK(err_code);
            break;
        }
    }

    // Update LED
    if (periph_link_cnt != NRF_SDH_BLE_PERIPHERAL_LINK_COUNT) {
        // Continue advertising. More connections can be established because the maximum link count has not been reached.
        advertising_start();
    }
}


/**@brief Function for handling the Disconnected event.
 *
 * @param[in] p_gap_evt GAP event received from the BLE stack.
 */
static void on_disconnected(ble_gap_evt_t const * const p_gap_evt)
{
    ret_code_t  err_code;
    uint32_t    periph_link_cnt = ble_conn_state_peripheral_conn_count(); // Number of peripheral links.

    NRF_LOG_INFO("Connection 0x%x has been disconnected. Reason: 0x%X",
                 p_gap_evt->conn_handle,
                 p_gap_evt->params.disconnected.reason);

    if (periph_link_cnt == (NRF_SDH_BLE_PERIPHERAL_LINK_COUNT - 1))
    {
        // Advertising is not running when all connections are taken, and must therefore be started.
        advertising_start();
    }
}


/**@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)
{
    NRF_LOG_INFO("ble_evt_handler");

    ret_code_t err_code;

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            NRF_LOG_INFO("BLE_GAP_EVT_CONNECTED, %d", p_ble_evt->evt.gap_evt.conn_handle);
            on_connected(&p_ble_evt->evt.gap_evt);
            break;

        case BLE_GAP_EVT_DISCONNECTED:
            NRF_LOG_INFO("BLE_GAP_EVT_DISCONNECTED");
            on_disconnected(&p_ble_evt->evt.gap_evt);
            break;

        /*case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
            NRF_LOG_INFO("BLE_GAP_EVT_SEC_PARAMS_REQUEST, %d", p_ble_evt->evt.gap_evt.conn_handle);
            // 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);

            NRF_LOG_INFO("ERROR CODE, %d", err_code);
            APP_ERROR_CHECK(err_code);
            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_GATTS_EVT_SYS_ATTR_MISSING:
            NRF_LOG_INFO("BLE_GATTS_EVT_SYS_ATTR_MISSING");
            // No system attributes have been stored.
            err_code = sd_ble_gatts_sys_attr_set(p_ble_evt->evt.gap_evt.conn_handle, NULL, 0, 0);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_GATTC_EVT_TIMEOUT:
            // Disconnect on GATT Client timeout event.
            NRF_LOG_DEBUG("GATT Client Timeout.");
            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.
            NRF_LOG_DEBUG("GATT Server Timeout.");
            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;

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


/**@brief Function for initializing the BLE stack.
 *
 * @details 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 initializing the logging 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 initializing power management.
 */
static void power_management_init(void)
{
    ret_code_t err_code;
    err_code = nrf_pwr_mgmt_init();
    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)
{
    if (NRF_LOG_PROCESS() == false)
    {
        nrf_pwr_mgmt_run();
    }
}


static void nrf_gpio_cfg_output_high_drive(uint32_t pin_number)
{
  nrf_gpio_cfg(pin_number,  NRF_GPIO_PIN_DIR_OUTPUT,
                            NRF_GPIO_PIN_INPUT_DISCONNECT,
                            NRF_GPIO_PIN_NOPULL,
                            NRF_GPIO_PIN_H0H1,
                            NRF_GPIO_PIN_NOSENSE);
}


static void gpio_init(void)
{
    NRF_LOG_DEBUG("GPIO initialization.");
    // Set relay PIN pin as output
    //nrf_gpio_cfg_output(RELAY_PIN);

    nrf_gpio_cfg_output_high_drive(RELAY_PIN);

    // Set the pin low
    nrf_gpio_pin_clear(RELAY_PIN);
}

static void flash_init(void) {
  ret_code_t ret = fds_init();
  APP_ERROR_CHECK(ret);
}


/**@brief Function for application main entry.
 */
int main(void)
{
    // Initialize.
    log_init();
    timers_init();
    power_management_init();
    ble_stack_init();
    peer_manager_init();
    flash_init();
    gap_params_init();
    gatt_init();
    services_init();
    advertising_init();
    conn_params_init();
    gpio_init();

    // Start execution.
    NRF_LOG_INFO("Application started.");
    advertising_start();

    // Enter main loop.
    for (;;) {
        idle_state_handle();
    }
}


/**
 * @}
 */

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