text: /* Copyright (c) 2016 Nordic Semiconductor. All Rights Reserved.
   *
   * The information contained herein is property of Nordic Semiconductor ASA.
   * Terms and conditions of usage are described in detail in NORDIC
   * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
   *
   * Licensees are granted free, non-transferable use of the information. NO
   * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
   * the file.
   *
   */
  
  /** @file
   *
   * @defgroup ble_sdk_app_bms_main main.c
   * @{
   * @ingroup ble_sdk_app_bms
   * @brief Bond Management Service Sample Application
   *
   * This file contains the source code for a sample application using the Bond Management service.
   *
   */
  
  #include <stdint.h>
  #include <string.h>
  #include "nordic_common.h"
  #include "nrf.h"
  #include "app_error.h"
  #include "nrf_gpio.h"
  #include "ble.h"
  #include "ble_hci.h"
  #include "ble_srv_common.h"
  #include "ble_advdata.h"
  #include "ble_advertising.h"
  #include "ble_conn_params.h"
  #include "boards.h"
  #include "softdevice_handler.h"
  #include "app_timer.h"
  #include "peer_manager.h"
  #include "bsp.h"
  #include "bsp_btn_ble.h"
  #include "fds.h"
  #include "fstorage.h"
  #include "ble_conn_state.h"
  
  #include "ble_dis.h"
  #include "nrf_ble_bms.h"
  
  #define NRF_LOG_MODULE_NAME "APP"
  #include "nrf_log.h"
  #include "nrf_log_ctrl.h"
  
  #define IS_SRVC_CHANGED_CHARACT_PRESENT 0                                           //!< Include or not the service_changed characteristic. if not enabled, the server's database cannot be changed for the lifetime of the device*/
  
  #if (NRF_SD_BLE_API_VERSION == 3)
  #define NRF_BLE_MAX_MTU_SIZE            GATT_MTU_SIZE_DEFAULT                       //!< MTU size used in the softdevice enabling and to reply to a BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST event. */
  #endif
  
  #define DEVICE_NAME                     "Nordic_BMS"                                //!< Name of device. Will be included in the advertising data. */
  #define MANUFACTURER_NAME               "NordicSemiconductor"                       //!< Manufacturer. Will be passed to Device Information Service. */
  #define APP_ADV_INTERVAL                40                                          //!< The advertising interval (in units of 0.625 ms. This value corresponds to 25 ms). */
  #define APP_ADV_TIMEOUT_IN_SECONDS      180                                         //!< The advertising timeout in units of seconds. */
  
  #define CENTRAL_LINK_COUNT              0                                           //!< Number of central links used by the application. When changing this number remember to adjust the RAM settings*/
  #define PERIPHERAL_LINK_COUNT           1                                           //!< Number of peripheral links used by the application. When changing this number remember to adjust the RAM settings*/
  
  #define APP_TIMER_PRESCALER             0                                           //!< Value of the RTC1 PRESCALER register. */
  #define APP_TIMER_OP_QUEUE_SIZE         6                                           //!< Size of timer operation queues. */
  
  #define SECURITY_REQUEST_DELAY          APP_TIMER_TICKS(4000, APP_TIMER_PRESCALER)  //!< Delay after connection until Security Request is sent, if necessary (ticks). */
  
  #define SECOND_10_MS_UNITS              100                                         //!< Definition of 1 second, when 1 unit is 10 ms. */
  #define MIN_CONN_INTERVAL               7                                           //!< Minimum acceptable connection interval (0.25 seconds), Connection interval uses 1.25 ms units. */
  #define MAX_CONN_INTERVAL               400                                         //!< Maximum acceptable connection interval (0.5 second), Connection interval uses 1.25 ms units. */
  #define SLAVE_LATENCY                   0                                           //!< Slave latency. */
  #define CONN_SUP_TIMEOUT                (4 * SECOND_10_MS_UNITS)                    //!< Connection supervisory timeout (4 seconds), Supervision Timeout uses 10 ms units. */
  
  #define FIRST_CONN_PARAMS_UPDATE_DELAY  APP_TIMER_TICKS(15000, APP_TIMER_PRESCALER) //!< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */
  #define NEXT_CONN_PARAMS_UPDATE_DELAY   APP_TIMER_TICKS(5000, APP_TIMER_PRESCALER)  //!< 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 SEC_PARAM_TIMEOUT               30                                          //!< Timeout for Pairing Request or Security Request (in seconds). */
  #define SEC_PARAM_BOND                  1                                           //!< Perform bonding. */
  #define SEC_PARAM_MITM                  0                                           //!< Man In The Middle protection not required. */
  #define SEC_PARAM_LESC                  0                                           //!< LE Secure Connections not enabled. */
  #define SEC_PARAM_KEYPRESS              0                                           //!< Keypress notifications not enabled. */
  #define SEC_PARAM_IO_CAPABILITIES       BLE_GAP_IO_CAPS_NONE                        //!< No I/O capabilities. */
  #define SEC_PARAM_OOB                   0                                           //!< Out Of Band data not available. */
  #define SEC_PARAM_MIN_KEY_SIZE          7                                           //!< Minimum encryption key size. */
  #define SEC_PARAM_MAX_KEY_SIZE          16                                          //!< Maximum encryption key size. */
  
  #define APP_ADV_FAST_INTERVAL           0x0028                                      //!< Fast advertising interval (in units of 0.625 ms. This value corresponds to 25 ms.). */
  #define APP_ADV_SLOW_INTERVAL           0x0C80                                      //!< Slow advertising interval (in units of 0.625 ms. This value corrsponds to 2 seconds). */
  #define APP_ADV_FAST_TIMEOUT            30                                          //!< The duration of the fast advertising period (in seconds). */
  #define APP_ADV_SLOW_TIMEOUT            180                                         //!< The duration of the slow advertising period (in seconds). */
  
  #define DEAD_BEEF                       0xDEADBEEF                                  //!< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */
  
  #define MEM_BUFF_SIZE 512
  
  
  nrf_ble_qwr_t                           m_qwr;                                      //!< Context for the Queued Write module. */
  uint8_t                                 m_qwr_mem[MEM_BUFF_SIZE];                   //!< Write buffer for the Queued Write module. */
  static pm_peer_id_t                     m_peer_id;                                  //!< Device reference handle to the current bonded central. */
  static uint16_t                         m_conn_handle = BLE_CONN_HANDLE_INVALID;    //!< Handle of the current connection. */
  static nrf_ble_bms_t                    m_bms;                                      //!< Structure used to identify the Bond Management service. */
  static ble_conn_state_user_flag_id_t    m_bms_bonds_to_delete;                      //!< Flags used to identify bonds that should be deleted. */
  
  
  APP_TIMER_DEF(m_sec_req_timer_id);                                                  //!< Security request timer. The timer lets us start pairing request if one does not arrive from the Central. */
  
  static ble_uuid_t m_adv_uuids[] = {{BLE_UUID_BMS_SERVICE,  BLE_UUID_TYPE_BLE},};    //!< Universally unique service identifiers. */
  
  #ifdef USE_AUTHORIZATION_CODE
  static uint8_t m_auth_code[] = {'A', 'B', 'C', 'D'}; //0x41, 0x42, 0x43, 0x44
  static int m_auth_code_len = sizeof(m_auth_code);
  #endif
  
  /**@brief Callback function for asserts in the SoftDevice.
   *
   * @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]   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 Service 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 service_error_handler(uint32_t nrf_error)
  {
      APP_ERROR_HANDLER(nrf_error);
  }
  
  
  /**@brief Function for handling advertising errors.
   *
   * @param[in] nrf_error  Error code containing information about what went wrong.
   */
  static void ble_advertising_error_handler(uint32_t nrf_error)
  {
      APP_ERROR_HANDLER(nrf_error);
  }
  
  
  /**@brief Function for starting advertising.
   */
  static void advertising_start(void)
  {
      uint32_t ret;
  
      ret = ble_advertising_start(BLE_ADV_MODE_FAST);
      APP_ERROR_CHECK(ret);
  }
  
  
  /**@brief Function for handling the Security Request timer timeout.
   *
   * @details This function will be called each time the Security Request timer expires.
   *
   * @param[in]   p_context   Pointer used for passing some arbitrary information (context) from the
   *                          app_start_timer() call to the timeout handler.
   */
  static void sec_req_timeout_handler(void * p_context)
  {
      uint32_t                err_code;
      uint16_t                conn_handle;
      pm_conn_sec_status_t    status;
  
      if (m_peer_id != PM_PEER_ID_INVALID)
      {
          err_code = pm_conn_handle_get(m_peer_id, &conn_handle);
          APP_ERROR_CHECK(err_code);
  
          err_code = pm_conn_sec_status_get(conn_handle, &status);
          APP_ERROR_CHECK(err_code);
  
          // If the link is still not secured by the peer, initiate security procedure.
          if (!status.encrypted)
          {
              err_code = pm_conn_secure(conn_handle, false);
              APP_ERROR_CHECK(err_code);
          }
      }
  }
  
  
  /**@brief Function for the Timer initialization.
   *
  * @details Initializes the timer module. This creates and starts application timers.
  */
  static void timers_init(void)
  {
      uint32_t err_code;
  
      // Initialize timer module, making it use the scheduler.
      APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);
  
      // Create Security Request timer.
      err_code = app_timer_create(&m_sec_req_timer_id,
                                  APP_TIMER_MODE_SINGLE_SHOT,
                                  sec_req_timeout_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)
  {
      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);
  
      err_code = sd_ble_gap_appearance_set(BLE_APPEARANCE_UNKNOWN);
      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 events from bond management service.
   */
  void bms_evt_handler(nrf_ble_bms_t * p_ess, nrf_ble_bms_evt_t * p_evt)
  {
      ret_code_t err_code;
      bool is_authorized = true;
  
      switch (p_evt->evt_type)
      {
          case NRF_BLE_BMS_EVT_AUTH:
              NRF_LOG_DEBUG("Authorization request.\r\n");
  #if USE_AUTHORIZATION_CODE
              if ((p_evt->auth_code.len != m_auth_code_len) ||
                  (memcmp(m_auth_code, p_evt->auth_code.code, m_auth_code_len) != 0))
              {
                  is_authorized = false;
              }
  #endif
              err_code = nrf_ble_bms_auth_response(&m_bms, is_authorized);
              APP_ERROR_CHECK(err_code);
      }
  }
  
  
  uint16_t qwr_evt_handler(nrf_ble_qwr_t * p_qwr, nrf_ble_qwr_evt_t * p_evt)
  {
      return nrf_ble_bms_on_qwr_evt(&m_bms, p_qwr, p_evt);
  }
  
  
  static void delete_disconnected_bonds(void)
  {
      uint32_t err_code;
      sdk_mapped_flags_key_list_t conn_handle_list = ble_conn_state_conn_handles();
  
      for (uint32_t i = 0; i < conn_handle_list.len; i++)
      {
          pm_peer_id_t peer_id;
          uint16_t conn_handle = conn_handle_list.flag_keys[i];
          bool pending         = ble_conn_state_user_flag_get(conn_handle, m_bms_bonds_to_delete);
  
          if (pending)
          {
              NRF_LOG_DEBUG("Attempting to delete bond.\r\n");
              err_code = pm_peer_id_get(conn_handle, &peer_id);
              if (err_code == NRF_SUCCESS)
              {
                  err_code = pm_peer_delete(peer_id);
                  APP_ERROR_CHECK(err_code);
              }
          }
      }
  }
  
  
  /**@brief Function for deleting the current bond
  */
  static void delete_requesting_bond(nrf_ble_bms_t const * p_bms)
  {
      NRF_LOG_INFO("Client requested that bond to current device deleted\r\n");
      ble_conn_state_user_flag_set(p_bms->conn_handle, m_bms_bonds_to_delete, true);
  }
  
  
  /**@brief Function for deleting all bonds
  */
  static void delete_all_bonds(nrf_ble_bms_t const * p_bms)
  {
      uint32_t err_code;
      uint16_t conn_handle;
  
      NRF_LOG_INFO("Client requested that all bonds be deleted\r\n");
  
      pm_peer_id_t peer_id = pm_next_peer_id_get(PM_PEER_ID_INVALID);
      while (peer_id != PM_PEER_ID_INVALID)
      {
          err_code = pm_conn_handle_get(peer_id, &conn_handle);
          APP_ERROR_CHECK(err_code);
  
          if (conn_handle != BLE_CONN_HANDLE_INVALID)
          {
              /* Defer the deletion since this connection is active. */
              ble_conn_state_user_flag_set(conn_handle, m_bms_bonds_to_delete, true);
          }
          else
          {
              err_code = pm_peer_delete(peer_id);
              APP_ERROR_CHECK(err_code);
          }
  
          peer_id = pm_next_peer_id_get(peer_id);
      }
  }
  
  
  /**@brief Function for deleting all bet requesting device bonds
  */
  static void delete_all_except_requesting_bond(nrf_ble_bms_t const * p_bms)
  {
      uint32_t err_code;
      uint16_t conn_handle;
  
      NRF_LOG_INFO("Client requested that all bonds except current bond be deleted\r\n");
  
      pm_peer_id_t peer_id = pm_next_peer_id_get(PM_PEER_ID_INVALID);
      while (peer_id != PM_PEER_ID_INVALID)
      {
          err_code = pm_conn_handle_get(peer_id, &conn_handle);
          APP_ERROR_CHECK(err_code);
  
          /* Do nothing if this is our own bond. */
          if (conn_handle != p_bms->conn_handle)
          {
              if (conn_handle != BLE_CONN_HANDLE_INVALID)
              {
                  /* Defer the deletion since this connection is active. */
                  ble_conn_state_user_flag_set(conn_handle, m_bms_bonds_to_delete, true);
              }
              else
              {
                  /* Delete immediately. */
                  err_code = pm_peer_delete(peer_id);
                  APP_ERROR_CHECK(err_code);
              }
          }
  
          peer_id = pm_next_peer_id_get(peer_id);
      }
  }
  
  
  /**@brief Function for initializing the services that will be used by the application.
   *
   * @details Initialize the Bond Management and Device Information services.
   */
  
  static void services_init(void)
  {
      uint32_t             err_code;
      ble_dis_init_t       dis_init;
      nrf_ble_bms_init_t   bms_init;
      nrf_ble_qwr_init_t   qwr_init;
  
      // Initialize Queued Write Module
      memset(&qwr_init, 0, sizeof(qwr_init));
      qwr_init.mem_buffer.len   = MEM_BUFF_SIZE;
      qwr_init.mem_buffer.p_mem = m_qwr_mem;
      qwr_init.callback         = qwr_evt_handler;
  
      err_code = nrf_ble_qwr_init(&m_qwr, &qwr_init);
      APP_ERROR_CHECK(err_code);
  
      // Initialize Bond Management Service
      memset(&bms_init, 0, sizeof(bms_init));
  
      m_bms_bonds_to_delete        = ble_conn_state_user_flag_acquire();
      bms_init.evt_handler         = bms_evt_handler;
      bms_init.error_handler       = service_error_handler;
  #if USE_AUTHORIZATION_CODE
      bms_init.feature.delete_requesting_auth         = true;
      bms_init.feature.delete_all_auth                = true;
      bms_init.feature.delete_all_but_requesting_auth = true;
  #else
      bms_init.feature.delete_requesting              = true;
      bms_init.feature.delete_all                     = true;
      bms_init.feature.delete_all_but_requesting      = true;
  #endif
      bms_init.bms_feature_sec_req = SEC_JUST_WORKS;
      bms_init.bms_ctrlpt_sec_req  = SEC_JUST_WORKS;
  
      bms_init.p_qwr                                       = &m_qwr;
      bms_init.bond_callbacks.delete_requesting            = delete_requesting_bond;
      bms_init.bond_callbacks.delete_all                   = delete_all_bonds;
      bms_init.bond_callbacks.delete_all_except_requesting = delete_all_except_requesting_bond;
  
      err_code = nrf_ble_bms_init(&m_bms, &bms_init);
      APP_ERROR_CHECK(err_code);
  
      // Initialize Device Information Service.
      memset(&dis_init, 0, sizeof(dis_init));
  
      ble_srv_ascii_to_utf8(&dis_init.manufact_name_str, MANUFACTURER_NAME);
  
      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);
  }
  
  
  /**@brief Function for handling the Connection Parameter events.
   *
   * @details This function will be called for all events in the Connection Parameters Module which
   *          are passed to the application.
   *          @note All this function does is to disconnect. This could have been done by simply
   *                setting the disconnect_on_fail configuration parameter, but instead we use the
   *                event handler mechanism to demonstrate its use.
   *
   * @param[in]   p_evt   Event received from the Connection Parameters Module.
   */
  static void on_conn_params_evt(ble_conn_params_evt_t * p_evt)
  {
      uint32_t err_code;
  
      if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)
      {
          err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
          APP_ERROR_CHECK(err_code);
      }
  }
  
  
  /**@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)
  {
      uint32_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             = false;
      cp_init.evt_handler                    = on_conn_params_evt;
      cp_init.error_handler                  = conn_params_error_handler;
  
      err_code = ble_conn_params_init(&cp_init);
      APP_ERROR_CHECK(err_code);
  }
  
  
  /**@brief Function for putting the chip into sleep mode.
   *
   * @note This function will 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 advertising events.
   *
   * @details This function will be called for advertising events which are passed to the application.
   *
   * @param[in] ble_adv_evt  Advertising event.
   */
  static void on_adv_evt(ble_adv_evt_t ble_adv_evt)
  {
      uint32_t err_code;
  
      switch (ble_adv_evt)
      {
          case BLE_ADV_EVT_FAST:
              NRF_LOG_INFO("Fast Adverstising\r\n");
              err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
              APP_ERROR_CHECK(err_code);
              break;
  
          case BLE_ADV_EVT_IDLE:
              sleep_mode_enter();
              break;
          default:
              break;
      }
  }
  
  
  /**@brief Function for handling the Application's BLE Stack events.
   *
   * @param[in]   p_ble_evt   Bluetooth stack event.
   */
  static void on_ble_evt(ble_evt_t * p_ble_evt)
  {
      ret_code_t err_code = NRF_SUCCESS;
  
      switch (p_ble_evt->header.evt_id)
      {
          case BLE_GAP_EVT_CONNECTED:
          {
              NRF_LOG_INFO("Connected\r\n");
              err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
              APP_ERROR_CHECK(err_code);
              m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
              err_code = nrf_ble_bms_set_conn_handle(&m_bms, m_conn_handle);
              APP_ERROR_CHECK(err_code);
              err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle);
              APP_ERROR_CHECK(err_code);
              break; // BLE_GAP_EVT_CONNECTED
          }
  
          case BLE_GAP_EVT_DISCONNECTED:
          {
              NRF_LOG_INFO("Disconnected\r\n");
              delete_disconnected_bonds();
              m_conn_handle = BLE_CONN_HANDLE_INVALID;
              err_code = app_timer_stop(m_sec_req_timer_id);
              APP_ERROR_CHECK(err_code);
              break;
          } // BLE_GAP_EVT_DISCONNECTED
  
          case BLE_GATTC_EVT_TIMEOUT:
              // Disconnect on GATT Client timeout event.
              NRF_LOG_DEBUG("GATT Client Timeout.\r\n");
              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; // BLE_GATTC_EVT_TIMEOUT
  
          case BLE_GATTS_EVT_TIMEOUT:
              // Disconnect on GATT Server timeout event.
              NRF_LOG_DEBUG("GATT Server Timeout.\r\n");
              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; // BLE_GATTS_EVT_TIMEOUT
  
  #if (NRF_SD_BLE_API_VERSION == 3)
          case BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST:
              err_code = sd_ble_gatts_exchange_mtu_reply(p_ble_evt->evt.gatts_evt.conn_handle,
                                                         NRF_BLE_MAX_MTU_SIZE);
              APP_ERROR_CHECK(err_code);
              break; // BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST
  #endif
  
          default:
              // No implementation needed.
              break;
      }
  }
  
  
  /**@brief Function for dispatching a BLE stack event to all modules with a BLE stack event handler.
   *
   * @details This function is called from the BLE Stack event interrupt handler after a BLE stack
   *          event has been received.
   *
   * @param[in]   p_ble_evt   Bluetooth stack event.
   */
  static void ble_evt_dispatch(ble_evt_t * p_ble_evt)
  {
      ble_conn_state_on_ble_evt(p_ble_evt);
      pm_on_ble_evt(p_ble_evt);
      nrf_ble_bms_on_ble_evt(&m_bms, p_ble_evt);
      nrf_ble_qwr_on_ble_evt(&m_qwr, p_ble_evt);
      ble_conn_params_on_ble_evt(p_ble_evt);
      bsp_btn_ble_on_ble_evt(p_ble_evt);
      on_ble_evt(p_ble_evt);
      ble_advertising_on_ble_evt(p_ble_evt);
  }
  
  
  /**@brief Function for dispatching a system event to interested modules.
   *
   * @details This function is called from the System event interrupt handler after a system
   *          event has been received.
   *
   * @param[in]   sys_evt   System stack event.
   */
  static void sys_evt_dispatch(uint32_t sys_evt)
  {
      // Dispatch the system event to the fstorage module, where it will be
      // dispatched to the Flash Data Storage (FDS) module.
      fs_sys_event_handler(sys_evt);
  
      // Dispatch to the Advertising module last, since it will check if there are any
      // pending flash operations in fstorage. Let fstorage process system events first,
      // so that it can report correctly to the Advertising module.
      ble_advertising_on_sys_evt(sys_evt);
  }
  
  
  /**@brief Function for initializing the BLE stack.
   *
   * @details Initializes the SoftDevice and the BLE event interrupt.
   */
  static void ble_stack_init(void)
  {
      uint32_t err_code;
  
      nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;
  
      // Initialize the SoftDevice handler module.
      SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);
  
      ble_enable_params_t ble_enable_params;
      err_code = softdevice_enable_get_default_config(CENTRAL_LINK_COUNT,
                                                      PERIPHERAL_LINK_COUNT,
                                                      &ble_enable_params);
      APP_ERROR_CHECK(err_code);
  
      //Check the ram settings against the used number of links
      CHECK_RAM_START_ADDR(CENTRAL_LINK_COUNT,PERIPHERAL_LINK_COUNT);
  
      // Enable BLE stack.
  #if (NRF_SD_BLE_API_VERSION == 3)
      ble_enable_params.gatt_enable_params.att_mtu = NRF_BLE_MAX_MTU_SIZE;
  #endif
      err_code = softdevice_enable(&ble_enable_params);
      APP_ERROR_CHECK(err_code);
  
      // Register with the SoftDevice handler module for BLE events.
      err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
      APP_ERROR_CHECK(err_code);
  
      // Register with the SoftDevice handler module for BLE events.
      err_code = softdevice_sys_evt_handler_set(sys_evt_dispatch);
      APP_ERROR_CHECK(err_code);
  }
  
  
  /**@brief Function for handling events from the BSP module.
   *
   * @param[in]   event   Event generated by button press.
   */
  static 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_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
              if (err_code != NRF_ERROR_INVALID_STATE)
              {
                  APP_ERROR_CHECK(err_code);
              }
              break;
  
          default:
              break;
      }
  }
  
  
  /**@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_DEBUG("Connected to previously bonded device\r\n");
              m_peer_id = p_evt->peer_id;
              // Start Security Request timer.
              err_code = pm_peer_rank_highest(p_evt->peer_id);
              if (err_code != NRF_ERROR_BUSY)
              {
                      APP_ERROR_CHECK(err_code);
              }
              err_code = app_timer_start(m_sec_req_timer_id, SECURITY_REQUEST_DELAY, NULL);
              APP_ERROR_CHECK(err_code);
          }break;//PM_EVT_BONDED_PEER_CONNECTED
  
          case PM_EVT_CONN_SEC_START:
              break;//PM_EVT_CONN_SEC_START
  
          case PM_EVT_CONN_SEC_SUCCEEDED:
          {
              NRF_LOG_DEBUG("Link secured. Role: %d. conn_handle: %d, Procedure: %d\r\n",
                             ble_conn_state_role(p_evt->conn_handle),
                             p_evt->conn_handle,
                             p_evt->params.conn_sec_succeeded.procedure);
              err_code = pm_peer_rank_highest(p_evt->peer_id);
              if (err_code != NRF_ERROR_BUSY)
              {
                  APP_ERROR_CHECK(err_code);
              }
              m_peer_id = p_evt->peer_id;
          }break;//PM_EVT_CONN_SEC_SUCCEEDED
  
          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. */
              NRF_LOG_DEBUG("Link secure failed!\r\n");
              switch (p_evt->params.conn_sec_failed.error)
              {
                  case PM_CONN_SEC_ERROR_PIN_OR_KEY_MISSING:
                      NRF_LOG_DEBUG("Error: PM_CONN_SEC_ERROR_PIN_OR_KEY_MISSING\r\n");
                      break;//PM_CONN_SEC_ERROR_PIN_OR_KEY_MISSING
  
                  case PM_CONN_SEC_ERROR_MIC_FAILURE:
                      NRF_LOG_DEBUG("Error: PM_CONN_SEC_ERROR_MIC_FAILURE\r\n");
                      break;//PM_CONN_SEC_ERROR_MIC_FAILURE
  
                  case PM_CONN_SEC_ERROR_DISCONNECT :
                      NRF_LOG_DEBUG("Error: PM_CONN_SEC_ERROR_DISCONNECT\r\n");
                      break;//PM_CONN_SEC_ERROR_DISCONNECT
  
                  case PM_CONN_SEC_ERROR_SMP_TIMEOUT:
                      NRF_LOG_DEBUG("Error: PM_CONN_SEC_ERROR_SMP_TIMEOUT\r\n");
                      break;//PM_CONN_SEC_ERROR_SMP_TIMEOUT
  
                  default:
                      NRF_LOG_DEBUG("Unknown Peer Manager error\r\n");
                      break;
              }
          } break; //PM_EVT_CONN_SEC_FAILED
  
          case PM_EVT_CONN_SEC_CONFIG_REQ:
          {
              // Reject pairing request from an already bonded peer.
              pm_conn_sec_config_t conn_sec_config = {.allow_repairing = false};
              pm_conn_sec_config_reply(p_evt->conn_handle, &conn_sec_config);
          }break;//PM_EVT_CONN_SEC_CONFIG_REQ
  
          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;//PM_EVT_STORAGE_FULL
  
          case PM_EVT_ERROR_UNEXPECTED:
              // Assert.
              APP_ERROR_CHECK(p_evt->params.error_unexpected.error);
              break;//PM_EVT_ERROR_UNEXPECTED
  
          case PM_EVT_PEER_DATA_UPDATE_SUCCEEDED:
              break;//PM_EVT_PEER_DATA_UPDATE_SUCCEEDED
  
          case PM_EVT_PEER_DATA_UPDATE_FAILED:
              // Assert.
              APP_ERROR_CHECK_BOOL(false);
              break;//PM_EVT_PEER_DATA_UPDATE_FAILED
  
          case PM_EVT_PEER_DELETE_SUCCEEDED:
              NRF_LOG_DEBUG("Peer Manager: Bond deleted\r\n");
              break;//PM_EVT_PEER_DELETE_SUCCEEDED
  
          case PM_EVT_PEER_DELETE_FAILED:
              // Assert.
              APP_ERROR_CHECK(p_evt->params.peer_delete_failed.error);
              break;//PM_EVT_PEER_DELETE_FAILED
  
          case PM_EVT_PEERS_DELETE_SUCCEEDED:
              NRF_LOG_DEBUG("Peer Manager: All bonds deleted\r\n");
              break;//PM_EVT_PEERS_DELETE_SUCCEEDED
  
          case PM_EVT_PEERS_DELETE_FAILED:
              // Assert.
              APP_ERROR_CHECK(p_evt->params.peers_delete_failed_evt.error);
              break;//PM_EVT_PEERS_DELETE_FAILED
  
          case PM_EVT_LOCAL_DB_CACHE_APPLIED:
              break;//PM_EVT_LOCAL_DB_CACHE_APPLIED
  
          case PM_EVT_LOCAL_DB_CACHE_APPLY_FAILED:
              // The local database has likely changed, send service changed indications.
              pm_local_database_has_changed();
              break;//PM_EVT_LOCAL_DB_CACHE_APPLY_FAILED
  
          case PM_EVT_SERVICE_CHANGED_IND_SENT:
              break;//PM_EVT_SERVICE_CHANGED_IND_SENT
  
          case PM_EVT_SERVICE_CHANGED_IND_CONFIRMED:
              break;//PM_EVT_SERVICE_CHANGED_IND_CONFIRMED
  
          default:
              // No implementation needed.
              break;
      }
  }
  
  
  /**@brief Function for the Peer Manager initialization.
   *
   * @param[in] erase_bonds  Indicates whether bonding information should be cleared from
   *                         persistent storage during initialization of the Peer Manager.
   */
  static void peer_manager_init(bool erase_bonds)
  {
      ble_gap_sec_params_t sec_param;
      ret_code_t err_code;
  
      err_code = pm_init();
      APP_ERROR_CHECK(err_code);
  
      if (erase_bonds)
      {
          err_code = pm_peers_delete();
          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              = SEC_PARAM_BOND;
      sec_param.mitm              = SEC_PARAM_MITM;
      sec_param.lesc              = SEC_PARAM_LESC;
      sec_param.keypress          = SEC_PARAM_KEYPRESS;
      sec_param.io_caps           = SEC_PARAM_IO_CAPABILITIES;
      sec_param.oob               = SEC_PARAM_OOB;
      sec_param.min_key_size      = SEC_PARAM_MIN_KEY_SIZE;
      sec_param.max_key_size      = SEC_PARAM_MAX_KEY_SIZE;
      sec_param.kdist_own.enc     = 1;
      sec_param.kdist_own.id      = 1;
      sec_param.kdist_peer.enc    = 1;
      sec_param.kdist_peer.id     = 1;
  
      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 initializing the Advertising functionality.
   */
  static void advertising_init(void)
  {
      uint32_t               err_code;
      uint8_t                adv_flags;
      ble_advdata_t          advdata;
      ble_adv_modes_config_t options;
  
      // Build and set advertising data
      memset(&advdata, 0, sizeof(advdata));
  
      adv_flags                       = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;
      advdata.name_type               = BLE_ADVDATA_FULL_NAME;
      advdata.include_appearance      = true;
      advdata.flags                   = adv_flags;
      advdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
      advdata.uuids_complete.p_uuids  = m_adv_uuids;
  
      memset(&options, 0, sizeof(options));
      options.ble_adv_whitelist_enabled      = false;
      options.ble_adv_directed_enabled       = true;
      options.ble_adv_directed_slow_enabled  = false;
      options.ble_adv_directed_slow_interval = 0;
      options.ble_adv_directed_slow_timeout  = 0;
      options.ble_adv_fast_enabled           = true;
      options.ble_adv_fast_interval          = APP_ADV_FAST_INTERVAL;
      options.ble_adv_fast_timeout           = APP_ADV_FAST_TIMEOUT;
      options.ble_adv_slow_enabled           = true;
      options.ble_adv_slow_interval          = APP_ADV_SLOW_INTERVAL;
      options.ble_adv_slow_timeout           = APP_ADV_SLOW_TIMEOUT;
  
      err_code = ble_advertising_init(&advdata, NULL, &options, on_adv_evt, ble_advertising_error_handler);
      APP_ERROR_CHECK(err_code);
  }
  
  
  /**@brief Function for initializing buttons and leds.
   *
   * @param[out] p_erase_bonds  Will be true if the clear bonding button was pressed to wake the application up.
   */
  static void buttons_leds_init(bool * p_erase_bonds)
  {
      bsp_event_t startup_event;
  
      uint32_t err_code = bsp_init(BSP_INIT_LED | BSP_INIT_BUTTONS,
                                   APP_TIMER_TICKS(100, APP_TIMER_PRESCALER),
                                   bsp_event_handler);
      APP_ERROR_CHECK(err_code);
  
      err_code = bsp_btn_ble_init(NULL, &startup_event);
      APP_ERROR_CHECK(err_code);
  
      *p_erase_bonds = (startup_event == BSP_EVENT_CLEAR_BONDING_DATA);
  }
  
  
  /**@brief Function for the Power manager.
   */
  static void power_manage(void)
  {
      uint32_t err_code = sd_app_evt_wait();
      APP_ERROR_CHECK(err_code);
  }
  
  
  /**@brief Function for application main entry.
   */
  int main(void)
  {
      uint32_t err_code;
      bool erase_bonds;
  
      // Initialize.
      err_code = NRF_LOG_INIT(NULL);
      APP_ERROR_CHECK(err_code);
      timers_init();
      buttons_leds_init(&erase_bonds);
      ble_stack_init();
      peer_manager_init(erase_bonds);
      if (erase_bonds == true)
      {
          NRF_LOG_INFO("Bonds erased!\r\n");
      }
      gap_params_init();
      advertising_init();
      services_init();
      conn_params_init();
  
      // Start execution.
      NRF_LOG_INFO("Bond Management Server Start!\r\n");
      advertising_start();
  
      // Enter main loop.
      for (;;)
      {
          if (NRF_LOG_PROCESS() == false)
          {
              power_manage();
          }
      }
  }
  
  
  /**
   * @}
   */
  