text: /* Copyright (c) 2014 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_gls_main main.c
   * @{
   * @ingroup ble_sdk_app_gls
   * @brief Glucose Meter service Sample Application
   *
   * This file contains the source code for a sample application using the Glucose Meter service
   * (and also Battery and Device Information services). This application uses the
   * @ref srvlib_conn_params module.
   */
  
  #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_dis.h"
  #include "ble_bas.h"
  #include "ble_gls.h"
  #include "ble_racp.h"
  #include "ble_conn_params.h"
  #include "boards.h"
  #include "sensorsim.h"
  #include "softdevice_handler.h"
  #include "app_timer.h"
  #include "peer_manager.h"
  #include "app_button.h"
  #include "pstorage.h"
  #include "app_uart.h"
  #include "bsp.h"
  #include "bsp_btn_ble.h"
  #include "nrf_log.h"
  #include "fds.h"
  #include "fstorage.h"
  #include "ble_conn_state.h"
  
  #if BUTTONS_NUMBER < 2
  #error "Not enough resources on board to run example"
  #endif
  
  
  #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_LOG NRF_LOG
  
  #define UART_TX_BUF_SIZE 1024                                                      /**< UART TX buffer size. */
  #define UART_RX_BUF_SIZE 1                                                         /**< UART RX buffer size. */
  
  
  #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*/
  
  #define DEVICE_NAME                    "Nordic_Glucose"                            /**< Name of device. Will be included in the advertising data. */
  #define MANUFACTURER_NAME              "NordicSemiconductor"                       /**< Manufacturer. Will be passed to Device Information Service. */
  #define MODEL_NUMBER                   "nRF51"                                     /**< Model Number string. Will be passed to Device Information Service. */
  #define MANUFACTURER_ID                0x55AA55AA55                                /**< DUMMY Manufacturer ID. Will be passed to Device Information Service. You shall use the ID for your Company*/
  #define ORG_UNIQUE_ID                  0xEEBBEE                                    /**< DUMMY Organisation Unique ID. Will be passed to Device Information Service. You shall use the Organisation Unique ID relevant for your Company */
  
  #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 APP_TIMER_PRESCALER            0                                           /**< Value of the RTC1 PRESCALER register. */
  #define APP_TIMER_OP_QUEUE_SIZE        4                                           /**< Size of timer operation queues. */
  
  #define SECURITY_REQUEST_DELAY         APP_TIMER_TICKS(400, APP_TIMER_PRESCALER)  /**< Delay after connection until Security Request is sent, if necessary (ticks). */
  
  #define BATTERY_LEVEL_MEAS_INTERVAL    APP_TIMER_TICKS(10000, APP_TIMER_PRESCALER) /**< Battery level measurement interval (ticks). */
  #define MIN_BATTERY_LEVEL              81                                          /**< Minimum battery level as returned by the simulated measurement function. */
  #define MAX_BATTERY_LEVEL              100                                         /**< Maximum battery level as returned by the simulated measurement function. */
  #define BATTERY_LEVEL_INCREMENT        1                                           /**< Value by which the battery level is incremented/decremented for each call to the simulated measurement function. */
  
  #define MIN_CONN_INTERVAL              MSEC_TO_UNITS(10, UNIT_1_25_MS)             /**< Minimum acceptable connection interval (10 ms). */
  #define MAX_CONN_INTERVAL              MSEC_TO_UNITS(100, UNIT_1_25_MS)            /**< Maximum acceptable connection interval (100 ms) */
  #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, 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(30000, APP_TIMER_PRESCALER) /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */
  #define MAX_CONN_PARAM_UPDATE_COUNT    3                                           /**< Number of attempts before giving up the connection parameter negotiation. */
  
  #define SEC_PARAM_BOND                 1                                           /**< Perform bonding. */
  #define SEC_PARAM_MITM                 1                                           /**< Man In The Middle protection required (applicable when display module is detected). */
  #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_DISPLAY_ONLY                /**< Display 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 PASSKEY_TXT                    "Passkey:"                                  /**< Message to be displayed together with the pass-key. */
  #define PASSKEY_TXT_LENGTH             8                                           /**< Length of message to be displayed together with the pass-key. */
  #define PASSKEY_LENGTH                 6                                           /**< Length of pass-key received by the stack for display. */
  
  #define DEAD_BEEF                      0xDEADBEEF                                  /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */
  
  #define APP_FEATURE_NOT_SUPPORTED      BLE_GATT_STATUS_ATTERR_APP_BEGIN + 2        /**< Reply when unsupported features are requested. */
  
  static uint16_t                        m_conn_handle = BLE_CONN_HANDLE_INVALID;    /**< Handle of the current connection. */
  static ble_bas_t                       m_bas;                                      /**< Structure used to identify the battery service. */
  static ble_gls_t                       m_gls;                                      /**< Structure used to identify the glucose service. */
  
  static sensorsim_cfg_t                 m_battery_sim_cfg;                         /**< Battery Level sensor simulator configuration. */
  static sensorsim_state_t               m_battery_sim_state;                       /**< Battery Level sensor simulator state. */
  
  APP_TIMER_DEF(m_battery_timer_id);                                                /**< Battery timer. */
  APP_TIMER_DEF(m_sec_req_timer_id);                                                /**< Security Request timer. */
  
  static ble_uuid_t m_adv_uuids[] = {{BLE_UUID_GLUCOSE_SERVICE,            BLE_UUID_TYPE_BLE},
                                     {BLE_UUID_BATTERY_SERVICE,            BLE_UUID_TYPE_BLE},
                                     {BLE_UUID_DEVICE_INFORMATION_SERVICE, BLE_UUID_TYPE_BLE}}; /**< Universally unique service identifiers. */
  
  pm_peer_id_t peer_to_be_deleted = PM_PEER_ID_INVALID;
  
  static void advertising_start(void);
  
  
  /**@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_PRINTF_DEBUG("Connected to previously bonded device\r\n");
              // Start Security Request timer.
              err_code = app_timer_start(m_sec_req_timer_id, SECURITY_REQUEST_DELAY, NULL);
              APP_ERROR_CHECK(err_code);
              err_code = pm_peer_rank_highest(p_evt->peer_id);
              if (err_code != NRF_ERROR_BUSY)
              {
                      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:
          {
              /*Check if the link is authenticated (meaning at least MITM)*/
              pm_conn_sec_status_t conn_sec_status;
              err_code = pm_conn_sec_status_get(p_evt->conn_handle, &conn_sec_status);
              APP_ERROR_CHECK(err_code);
              if (!conn_sec_status.mitm_protected)
              {
                  APP_LOG("Collector did not use MITM, disconnecting\r\n");
                  /*The peer did not use MITM, disconnect*/
                  err_code = pm_peer_id_get(m_conn_handle, &peer_to_be_deleted);
                  APP_ERROR_CHECK(err_code);
                  err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
                  APP_ERROR_CHECK(err_code);
              }    
              else
              {
                  NRF_LOG_PRINTF_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);
                  }
              }
          }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. */
              APP_LOG("link secure failed! ");        
              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");
                      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");
                      break;//PM_CONN_SEC_ERROR_MIC_FAILURE
  
                  case PM_CONN_SEC_ERROR_DISCONNECT :
                      NRF_LOG_DEBUG("error: PM_CONN_SEC_ERROR_DISCONNECT ");
                      break;//PM_CONN_SEC_ERROR_DISCONNECT
  
                  case PM_CONN_SEC_ERROR_SMP_TIMEOUT:
                      NRF_LOG_DEBUG("error: PM_CONN_SEC_ERROR_SMP_TIMEOUT");
                      break;//PM_CONN_SEC_ERROR_SMP_TIMEOUT
  
                  default:
                      NRF_LOG_DEBUG("unknown error");
                      break;
              }
              APP_LOG("\r\nDisconnecting\r\n");
              err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
              APP_ERROR_CHECK(err_code);
              m_conn_handle = BLE_CONN_HANDLE_INVALID;
          }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:
              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:
              advertising_start();
              break;
  
          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 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 performing battery measurement and updating the Battery Level characteristic
   *        in Battery Service.
   */
  static void battery_level_update(void)
  {
      uint32_t err_code;
      uint8_t  battery_level;
  
      battery_level = (uint8_t)sensorsim_measure(&m_battery_sim_state, &m_battery_sim_cfg);
  
      err_code = ble_bas_battery_level_update(&m_bas, battery_level);
      if ((err_code != NRF_SUCCESS) &&
          (err_code != NRF_ERROR_INVALID_STATE) &&
          (err_code != BLE_ERROR_NO_TX_PACKETS) &&
          (err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)
         )
      {
          APP_ERROR_HANDLER(err_code);
      }
  }
  
  
  /**@brief Function for handling the Battery measurement timer timeout.
   *
   * @details This function will be called each time the battery level measurement 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 battery_level_meas_timeout_handler(void * p_context)
  {
      UNUSED_PARAMETER(p_context);
      battery_level_update();
  }
  
  
  /**@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;
  
      if (m_conn_handle != BLE_CONN_HANDLE_INVALID)
      {
          // Initiate bonding.
          NRF_LOG_DEBUG("Start encryption\r\n");
          err_code = pm_conn_secure(m_conn_handle, false);
          if (err_code != NRF_ERROR_INVALID_STATE)
          {
              APP_ERROR_CHECK(err_code);
          }
      }
  }
  
  
  /**@brief Function for updating glucose measurement and updating glucose characteristic in Glucose.
            Service.
   */
  static void read_glucose_measurement(void)
  {
      ble_gls_rec_t rec;
      uint32_t      err_code;
  
      static int16_t s_mantissa = 550;
      static int16_t s_exponent = -3;
      static uint8_t s_secs     = 5;
  
      // simulate the reading of a glucose measurement.
      rec.meas.flags                          = BLE_GLS_MEAS_FLAG_TIME_OFFSET   |
                                                BLE_GLS_MEAS_FLAG_CONC_TYPE_LOC |
                                                BLE_GLS_MEAS_FLAG_UNITS_MOL_L;
      rec.meas.base_time.year                 = 2012;
      rec.meas.base_time.month                = 1;
      rec.meas.base_time.day                  = 1;
      rec.meas.base_time.hours                = 12;
      rec.meas.base_time.minutes              = 30;
      rec.meas.base_time.seconds              = 15;
      rec.meas.glucose_concentration.exponent = s_exponent;
      rec.meas.glucose_concentration.mantissa = s_mantissa;
      rec.meas.time_offset                    = 0;
      rec.meas.type                           = BLE_GLS_MEAS_TYPE_CAP_BLOOD;
      rec.meas.sample_location                = BLE_GLS_MEAS_LOC_FINGER;
      rec.meas.sensor_status_annunciation     = 0;
  
      // change values for next read.
      s_mantissa += 23;
      if (s_mantissa > 939)
      {
          s_mantissa -= 434;
      }
  
      s_secs += 3;
      if (s_secs > 59)
      {
          s_secs = 0;
      }
  
      err_code = ble_gls_glucose_new_meas(&m_gls, &rec);
      if (err_code != NRF_SUCCESS)
      {
          // Do nothing.
      }
  }
  
  /**@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.
      APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);
  
      // Create timers.
      err_code = app_timer_create(&m_battery_timer_id,
                                  APP_TIMER_MODE_REPEATED,
                                  battery_level_meas_timeout_handler);
      APP_ERROR_CHECK(err_code);
  
      // 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_GENERIC_GLUCOSE_METER);
      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 services that will be used by the application.
   *
   * @details Initialize the Glucose, Battery and Device Information services.
   */
  static void services_init(void)
  {
      uint32_t       err_code;
      ble_gls_init_t gls_init;
      ble_dis_init_t dis_init;
      ble_bas_init_t bas_init;
  
      // Initialize Glucose Service - sample selection of feature bits.
      memset(&gls_init, 0, sizeof(gls_init));
  
      gls_init.evt_handler          = NULL;
      gls_init.error_handler        = service_error_handler;
      gls_init.feature              = 0;
      gls_init.feature             |= BLE_GLS_FEATURE_LOW_BATT;
      gls_init.feature             |= BLE_GLS_FEATURE_TEMP_HIGH_LOW;
      gls_init.feature             |= BLE_GLS_FEATURE_GENERAL_FAULT;
      gls_init.is_context_supported = false;
  
      err_code = ble_gls_init(&m_gls, &gls_init);
      APP_ERROR_CHECK(err_code);
  
      // Initialize Battery Service.
      memset(&bas_init, 0, sizeof(bas_init));
  
      // Here the sec level for the Battery Service can be changed/increased.
      BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_char_attr_md.cccd_write_perm);
      BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_char_attr_md.read_perm);
      BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&bas_init.battery_level_char_attr_md.write_perm);
  
      BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_report_read_perm);
  
      bas_init.evt_handler          = NULL;
      bas_init.support_notification = true;
      bas_init.p_report_ref         = NULL;
      bas_init.initial_batt_level   = 100;
  
      err_code = ble_bas_init(&m_bas, &bas_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_srv_ascii_to_utf8(&dis_init.serial_num_str, MODEL_NUMBER);
  
      ble_dis_sys_id_t system_id;
      system_id.manufacturer_id            = MANUFACTURER_ID;
      system_id.organizationally_unique_id = ORG_UNIQUE_ID;
      dis_init.p_sys_id                    = &system_id;
  
      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 initializing the sensor simulators.
   */
  static void sensor_simulator_init(void)
  {
      m_battery_sim_cfg.min          = MIN_BATTERY_LEVEL;
      m_battery_sim_cfg.max          = MAX_BATTERY_LEVEL;
      m_battery_sim_cfg.incr         = BATTERY_LEVEL_INCREMENT;
      m_battery_sim_cfg.start_at_max = true;
  
      sensorsim_init(&m_battery_sim_state, &m_battery_sim_cfg);
  }
  
  
  /**@brief Function for starting application timers.
   */
  static void application_timers_start(void)
  {
      uint32_t err_code;
  
      // Start application timers.
      err_code = app_timer_start(m_battery_timer_id, BATTERY_LEVEL_MEAS_INTERVAL, NULL);
      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_PARAM_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 the Application's BLE Stack 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;//BLE_ADV_EVT_FAST
  
          case BLE_ADV_EVT_IDLE:
              sleep_mode_enter();
              break;//BLE_ADV_EVT_IDLE
  
          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)
  {
      uint32_t err_code = NRF_SUCCESS;                    //lint -save -e438 // Last value assigned to variable 'err_code' not used
  
      switch (p_ble_evt->header.evt_id)
      {
          case BLE_GAP_EVT_DISCONNECTED:
          {
              m_conn_handle = BLE_CONN_HANDLE_INVALID;
              /*check if the last connected peer had not used MITM, if so, delete its bond information*/
              if (peer_to_be_deleted != PM_PEER_ID_INVALID)
              {
                  ret_code_t ret_val = pm_peer_delete(peer_to_be_deleted);
                  APP_ERROR_CHECK(ret_val);
                  APP_LOG("Collector's bond deleted\r\n");
                  peer_to_be_deleted = PM_PEER_ID_INVALID;
              }
          }break;//BLE_GAP_EVT_DISCONNECTED
  
          case BLE_GAP_EVT_CONNECTED:
          {
              peer_to_be_deleted = PM_PEER_ID_INVALID;
              err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
              APP_ERROR_CHECK(err_code);
              m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
              // Start Security Request timer.
              err_code = app_timer_start(m_sec_req_timer_id, SECURITY_REQUEST_DELAY, NULL);
              APP_ERROR_CHECK(err_code);
          }break;//BLE_GAP_EVT_CONNECTED
  
          case BLE_GATTS_EVT_TIMEOUT:
              // Disconnect on GATT Server timeout events.
              err_code = sd_ble_gap_disconnect(m_conn_handle,
                                               BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
              APP_ERROR_CHECK(err_code);
              break;//BLE_GATTS_EVT_TIMEOUT
  
          case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
              NRF_LOG_DEBUG("BLE_GAP_EVT_SEC_PARAMS_REQUEST\r\n");
          break;//BLE_GAP_EVT_SEC_PARAMS_REQUEST
  
          case BLE_GAP_EVT_PASSKEY_DISPLAY:
          {
              char passkey[PASSKEY_LENGTH+1];
              memcpy(passkey,p_ble_evt->evt.gap_evt.params.passkey_display.passkey,PASSKEY_LENGTH);
              passkey[PASSKEY_LENGTH] = 0;
              // Don't send delayed Security Request if security procedure is already in progress.
              err_code = app_timer_stop(m_sec_req_timer_id);
              APP_ERROR_CHECK(err_code);
  
              APP_LOG("Passkey: %s\r\n",passkey);
          }break;//BLE_GAP_EVT_PASSKEY_DISPLAY
  
          case BLE_EVT_USER_MEM_REQUEST:
              err_code = sd_ble_user_mem_reply(m_conn_handle, NULL);
              APP_ERROR_CHECK(err_code);
              break;//BLE_EVT_USER_MEM_REQUEST
  
          case BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST:
          {
              ble_gatts_rw_authorize_reply_params_t auth_reply;
  
              if(p_ble_evt->evt.gatts_evt.params.authorize_request.type
                 != BLE_GATTS_AUTHORIZE_TYPE_INVALID)
              {
                  if ((p_ble_evt->evt.gatts_evt.params.authorize_request.request.write.op
                       == BLE_GATTS_OP_PREP_WRITE_REQ)
                      || (p_ble_evt->evt.gatts_evt.params.authorize_request.request.write.op
                       == BLE_GATTS_OP_EXEC_WRITE_REQ_NOW)
                      || (p_ble_evt->evt.gatts_evt.params.authorize_request.request.write.op
                       == BLE_GATTS_OP_EXEC_WRITE_REQ_CANCEL))
                  {
                      if (p_ble_evt->evt.gatts_evt.params.authorize_request.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(m_conn_handle,&auth_reply);
                      APP_ERROR_CHECK(err_code);
                  }
              }
          }break;//BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST
  
          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);
      ble_gls_on_ble_evt(&m_gls, p_ble_evt);
      ble_bas_on_ble_evt(&m_bas, 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)
  {
      fs_sys_event_handler(sys_evt);
      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.
      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;//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:
              err_code = ble_advertising_restart_without_whitelist();
              if (err_code != NRF_ERROR_INVALID_STATE)
              {
                  APP_ERROR_CHECK(err_code);
              }
              break;//BSP_EVENT_WHITELIST_OFF
  
          case BSP_EVENT_KEY_1:
              read_glucose_measurement();
              break;//BSP_EVENT_KEY_1
  
          default:
              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.
   *
   * @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)
  {
      uint32_t      err_code;
      ble_advdata_t advdata;
  
      // 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_LIMITED_DISC_MODE;;
      advdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
      advdata.uuids_complete.p_uuids  = m_adv_uuids;
  
      ble_adv_modes_config_t options = {0};
      options.ble_adv_fast_enabled  = BLE_ADV_FAST_ENABLED;
      options.ble_adv_fast_interval = APP_ADV_INTERVAL;
      options.ble_adv_fast_timeout  = APP_ADV_TIMEOUT_IN_SECONDS;
  
      err_code = ble_advertising_init(&advdata, NULL, &options, on_adv_evt, NULL);
      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 starting advertising.
   */
  static void advertising_start(void)
  {
      uint32_t err_code = ble_advertising_start(BLE_ADV_MODE_FAST);
      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();
      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_DEBUG("Bonds erased!\r\n");
      }
      gap_params_init();
      advertising_init();
      services_init();
      sensor_simulator_init();
      conn_params_init();
  
      // Start execution.
      application_timers_start();
  
      advertising_start();
  
      APP_LOG("\r\nGLS Start!\r\n");
  
      // Enter main loop.
      for (;;)
      {
          power_manage();
      }
  }
  
  /**
   * @}
   */
  