text: /**
   * Copyright (c) 2014 - 2017, 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.
   * 
   */
  /** @example examples/ble_peripheral/ble_app_buttonless_dfu
   *
   * @brief Secure DFU Buttonless Service Application main file.
   *
   * This file contains the source code for a sample application using the proprietary
   * Secure DFU Buttonless Service. This is a template application that can be modified
   * to your needs. To extend the functionality of this application, please find
   * locations where the comment "// YOUR_JOB:" is present and read the comments.
   */
  
  #include <stdbool.h>
  #include <stdint.h>
  #include <string.h>
  
  #include "nrf_dfu_svci.h"
  #include "nrf_svci_async_function.h"
  #include "nrf_svci_async_handler.h"
  
  #include "nordic_common.h"
  #include "nrf.h"
  #include "app_error.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 "nrf_sdh.h"
  #include "nrf_sdh_soc.h"
  #include "nrf_sdh_ble.h"
  #include "app_timer.h"
  #include "peer_manager.h"
  #include "bsp_btn_ble.h"
  #include "ble_hci.h"
  #include "ble_advdata.h"
  #include "ble_advertising.h"
  #include "ble_conn_state.h"
  #include "ble_dfu.h"
  #include "nrf_ble_gatt.h"
  #include "fds.h"
  #include "nrf_pwr_mgmt.h"
  #include "nrf_drv_clock.h"
  
  #include "nrf_log.h"
  #include "nrf_log_ctrl.h"
  #include "nrf_log_default_backends.h"
  
  
  #define APP_FEATURE_NOT_SUPPORTED       BLE_GATT_STATUS_ATTERR_APP_BEGIN + 2        /**< Reply when unsupported features are requested. */
  
  #define DEVICE_NAME                     "Nordic_Buttonless"                         /**< 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                300                                         /**< The advertising interval (in units of 0.625 ms. This value corresponds to 187.5 ms). */
  #define APP_ADV_TIMEOUT_IN_SECONDS      180                                         /**< The advertising timeout in units of seconds. */
  
  #define APP_BLE_OBSERVER_PRIO           3                                           /**< Application's BLE observer priority. You shouldn't need to modify this value. */
  #define APP_BLE_CONN_CFG_TAG            1                                           /**< A tag identifying the SoftDevice BLE configuration. */
  
  #define MIN_CONN_INTERVAL               MSEC_TO_UNITS(100, UNIT_1_25_MS)            /**< Minimum acceptable connection interval (0.1 seconds). */
  #define MAX_CONN_INTERVAL               MSEC_TO_UNITS(200, UNIT_1_25_MS)            /**< Maximum acceptable connection interval (0.2 second). */
  #define SLAVE_LATENCY                   0                                           /**< Slave latency. */
  #define CONN_SUP_TIMEOUT                MSEC_TO_UNITS(4000, UNIT_10_MS)             /**< Connection supervisory timeout (4 seconds). */
  
  #define FIRST_CONN_PARAMS_UPDATE_DELAY  APP_TIMER_TICKS(5000)                       /**< 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(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 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 DEAD_BEEF                       0xDEADBEEF                                  /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */
  
  
  NRF_BLE_GATT_DEF(m_gatt);                                                           /**< GATT module instance. */
  BLE_ADVERTISING_DEF(m_advertising);                                                 /**< Advertising module instance. */
  
  static uint16_t m_conn_handle = BLE_CONN_HANDLE_INVALID;                            /**< Handle of the current connection. */
  static void advertising_start(bool erase_bonds);                                    /**< Forward declaration of advertising start function */
  
  
  /**@brief Handler for shutdown preparation.
   *
   * @details During shutdown procedures, this function will be called at a 1 second interval
   *          untill the function returns true. When the function returns true, it means that the
   *          app is ready to reset to DFU mode.
   *
   * @param[in]   event   Power manager event.
   *
   * @retval  True if shutdown is allowed by this power manager handler, otherwise false.
   */
  static bool app_shutdown_handler(nrf_pwr_mgmt_evt_t event)
  {
      switch (event)
      {
          case NRF_PWR_MGMT_EVT_PREPARE_DFU:
              NRF_LOG_INFO("Power management wants to reset to DFU mode.");
              // YOUR_JOB: Get ready to reset into DFU mode
              //
              // If you aren't finished with any ongoing tasks, return "false" to
              // signal to the system that reset is impossible at this stage.
              //
              // Here is an example using a variable to delay resetting the device.
              //
              // if (!m_ready_for_reset)
              // {
              //      return false;
              // }
              // else
              //{
              //
              //    // Device ready to enter
              //    uint32_t err_code;
              //    err_code = sd_softdevice_disable();
              //    APP_ERROR_CHECK(err_code);
              //    err_code = app_timer_stop_all();
              //    APP_ERROR_CHECK(err_code);
              //}
              break;
  
          default:
              // YOUR_JOB: Implement any of the other events available from the power management module:
              //      -NRF_PWR_MGMT_EVT_PREPARE_SYSOFF
              //      -NRF_PWR_MGMT_EVT_PREPARE_WAKEUP
              //      -NRF_PWR_MGMT_EVT_PREPARE_RESET
              return true;
      }
  
      NRF_LOG_INFO("Power management allowed to reset to DFU mode.");
      return true;
  }
  
  //lint -esym(528, m_app_shutdown_handler)
  /**@brief Register application shutdown handler with priority 0.
   */
  NRF_PWR_MGMT_HANDLER_REGISTER(app_shutdown_handler, 0);
  
  
  // YOUR_JOB: Use UUIDs for service(s) used in your application.
  static ble_uuid_t m_adv_uuids[] = {{BLE_UUID_DEVICE_INFORMATION_SERVICE, BLE_UUID_TYPE_BLE}};
  
  
  // YOUR_JOB: Update this code if you want to do anything given a DFU event (optional).
  /**@brief Function for handling dfu events from the Buttonless Secure DFU service
   *
   * @param[in]   event   Event from the Buttonless Secure DFU service.
   */
  static void ble_dfu_evt_handler(ble_dfu_buttonless_evt_type_t event)
  {
      switch (event)
      {
          case BLE_DFU_EVT_BOOTLOADER_ENTER_PREPARE:
              NRF_LOG_INFO("Device is preparing to enter bootloader mode.");
              // YOUR_JOB: Disconnect all bonded devices that currently are connected.
              //           This is required to receive a service changed indication
              //           on bootup after a successful (or aborted) Device Firmware Update.
              break;
  
          case BLE_DFU_EVT_BOOTLOADER_ENTER:
              // YOUR_JOB: Write app-specific unwritten data to FLASH, control finalization of this
              //           by delaying reset by reporting false in app_shutdown_handler
              NRF_LOG_INFO("Device will enter bootloader mode.");
              break;
  
          case BLE_DFU_EVT_BOOTLOADER_ENTER_FAILED:
              NRF_LOG_ERROR("Request to enter bootloader mode failed asynchroneously.");
              // YOUR_JOB: Take corrective measures to resolve the issue
              //           like calling APP_ERROR_CHECK to reset the device.
              break;
  
          case BLE_DFU_EVT_RESPONSE_SEND_ERROR:
              NRF_LOG_ERROR("Request to send a response to client failed.");
              // YOUR_JOB: Take corrective measures to resolve the issue
              //           like calling APP_ERROR_CHECK to reset the device.
              APP_ERROR_CHECK(false);
              break;
  
          default:
              NRF_LOG_ERROR("Unknown event from ble_dfu_buttonless.");
              break;
      }
  }
  
  
  /**@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 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: 0x%x, procedure: %d.",
                           ble_conn_state_role(p_evt->conn_handle),
                           p_evt->conn_handle,
                           p_evt->params.conn_sec_succeeded.procedure);
          } break;
  
          case PM_EVT_CONN_SEC_FAILED:
          {
              /* Often, when securing fails, it shouldn't be restarted, for security reasons.
               * Other times, 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:
          {
              // 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;
  
          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:
          {
              advertising_start(false);
          } 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_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_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 Timer initialization.
   *
   * @details Initializes the timer module. This creates and starts application timers.
   */
  static void timers_init(void)
  {
  
      // Initialize timer module.
      uint32_t err_code = app_timer_init();
      APP_ERROR_CHECK(err_code);
  
      // Create timers.
  
      /* YOUR_JOB: Create any timers to be used by the application.
                   Below is an example of how to create a timer.
                   For every new timer needed, increase the value of the macro APP_TIMER_MAX_TIMERS by
                   one.
         uint32_t err_code;
         err_code = app_timer_create(&m_app_timer_id, APP_TIMER_MODE_REPEATED, timer_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);
  
      /* YOUR_JOB: Use an appearance value matching the application's use case.
         err_code = sd_ble_gap_appearance_set(BLE_APPEARANCE_);
         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 the YYY Service events.
   * YOUR_JOB implement a service handler function depending on the event the service you are using can generate
   *
   * @details This function will be called for all YY Service events which are passed to
   *          the application.
   *
   * @param[in]   p_yy_service   YY Service structure.
   * @param[in]   p_evt          Event received from the YY Service.
   *
   *
     static void on_yys_evt(ble_yy_service_t     * p_yy_service,
                            ble_yy_service_evt_t * p_evt)
     {
      switch (p_evt->evt_type)
      {
          case BLE_YY_NAME_EVT_WRITE:
              APPL_LOG("[APPL]: charact written with value %s. ", p_evt->params.char_xx.value.p_str);
              break;
  
          default:
              // No implementation needed.
              break;
      }
     }*/
  
  
  /**@brief Function for initializing services that will be used by the application.
   */
  static void services_init(void)
  {
      uint32_t err_code;
      ble_dfu_buttonless_init_t dfus_init =
      {
          .evt_handler = ble_dfu_evt_handler
      };
  
      // Initialize the async SVCI interface to bootloader.
      err_code = ble_dfu_buttonless_async_svci_init();
      APP_ERROR_CHECK(err_code);
  
  
      err_code = ble_dfu_buttonless_init(&dfus_init);
      APP_ERROR_CHECK(err_code);
  
      /* YOUR_JOB: Add code to initialize the services used by the application.
         uint32_t                           err_code;
         ble_xxs_init_t                     xxs_init;
         ble_yys_init_t                     yys_init;
  
         // Initialize XXX Service.
         memset(&xxs_init, 0, sizeof(xxs_init));
  
         xxs_init.evt_handler                = NULL;
         xxs_init.is_xxx_notify_supported    = true;
         xxs_init.ble_xx_initial_value.level = 100;
  
         err_code = ble_bas_init(&m_xxs, &xxs_init);
         APP_ERROR_CHECK(err_code);
  
         // Initialize YYY Service.
         memset(&yys_init, 0, sizeof(yys_init));
         yys_init.evt_handler                  = on_yys_evt;
         yys_init.ble_yy_initial_value.counter = 0;
  
         err_code = ble_yy_service_init(&yys_init, &yy_init);
         APP_ERROR_CHECK(err_code);
       */
  }
  
  
  /**@brief Function for handling the Connection Parameters Module.
   *
   * @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 config 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 starting timers.
   */
  static void application_timers_start(void)
  {
      /* YOUR_JOB: Start your timers. below is an example of how to start a timer.
         uint32_t err_code;
         err_code = app_timer_start(m_app_timer_id, TIMER_INTERVAL, NULL);
         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:
              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 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 = NRF_SUCCESS;
  
      switch (p_ble_evt->header.evt_id)
      {
          case BLE_GAP_EVT_DISCONNECTED:
              // LED indication will be changed when advertising starts.
              break;
  
          case BLE_GAP_EVT_CONNECTED:
              err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
              APP_ERROR_CHECK(err_code);
              m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
              break;
  
  #ifndef S140
          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;
  #endif
  
          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;
  
          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
  
          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);
  
      NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
  }
  
  
  /**@brief Function for the Peer Manager initialization.
   */
  static void peer_manager_init()
  {
      ble_gap_sec_params_t sec_param;
      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           = 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 Clear bonding information from persistent storage.
   */
  static void delete_bonds(void)
  {
      ret_code_t err_code;
  
      NRF_LOG_INFO("Erase bonds!");
  
      err_code = pm_peers_delete();
      APP_ERROR_CHECK(err_code);
  }
  
  
  /**@brief Function for handling events from the BSP module.
   *
   * @param[in]   event   Event generated when button is pressed.
   */
  static void bsp_event_handler(bsp_event_t event)
  {
      uint32_t err_code;
  
      switch (event)
      {
          case BSP_EVENT_SLEEP:
              sleep_mode_enter();
              break; // BSP_EVENT_SLEEP
  
          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; // BSP_EVENT_DISCONNECT
  
          case BSP_EVENT_WHITELIST_OFF:
              if (m_conn_handle == BLE_CONN_HANDLE_INVALID)
              {
                  err_code = ble_advertising_restart_without_whitelist(&m_advertising);
                  if (err_code != NRF_ERROR_INVALID_STATE)
                  {
                      APP_ERROR_CHECK(err_code);
                  }
              }
              break; // BSP_EVENT_KEY_0
  
          default:
              break;
      }
  }
  
  
  /**@brief Function for initializing the Advertising functionality.
   */
  static void advertising_init(void)
  {
      uint32_t               err_code;
      ble_advertising_init_t init;
  
      memset(&init, 0, sizeof(init));
  
      init.advdata.name_type               = BLE_ADVDATA_FULL_NAME;
      init.advdata.include_appearance      = true;
      init.advdata.flags                   = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
      init.advdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
      init.advdata.uuids_complete.p_uuids  = m_adv_uuids;
  
      init.config.ble_adv_fast_enabled  = true;
      init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
      init.config.ble_adv_fast_timeout  = APP_ADV_TIMEOUT_IN_SECONDS;
  
      init.evt_handler = on_adv_evt;
  
      err_code = ble_advertising_init(&m_advertising, &init);
      APP_ERROR_CHECK(err_code);
  
      ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
  }
  
  
  /**@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)
  {
      uint32_t err_code;
      bsp_event_t startup_event;
  
      err_code = bsp_init(BSP_INIT_LED | BSP_INIT_BUTTONS, 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 log_init(void)
  {
      uint32_t err_code = NRF_LOG_INIT(NULL);
      APP_ERROR_CHECK(err_code);
  
      NRF_LOG_DEFAULT_BACKENDS_INIT();
  }
  
  
  /**@brief   Function for initializing the GATT module.
   * @details The GATT module handles ATT_MTU and Data Length update procedures automatically.
   */
  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 starting advertising.
   */
  static void advertising_start(bool erase_bonds)
  {
      if (erase_bonds == true)
      {
          delete_bonds();
          // Advertising is started by PM_EVT_PEERS_DELETE_SUCCEEDED event.
      }
      else
      {
          uint32_t err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);
          APP_ERROR_CHECK(err_code);
  
          NRF_LOG_DEBUG("advertising is started");
      }
  }
  
  static void power_management_init(void)
  {
      uint32_t err_code = nrf_pwr_mgmt_init();
      APP_ERROR_CHECK(err_code);
  }
  
  /**@brief Function for application main entry.
   */
  int main(void)
  {
      bool erase_bonds;
  
      // Initialize.
      log_init();
  
      timers_init();
      power_management_init();
      buttons_leds_init(&erase_bonds);
      ble_stack_init();
      peer_manager_init();
      gap_params_init();
      gatt_init();
      advertising_init();
      services_init();
      conn_params_init();
  
      NRF_LOG_INFO("Application started\n");
  
      // Start execution.
      application_timers_start();
      advertising_start(erase_bonds);
  
      // Enter main loop.
      for (;;)
      {
          if (NRF_LOG_PROCESS() == false)
          {
              nrf_pwr_mgmt_run();
          }
      }
  }
  
  /**
   * @}
   */
  