main.c

/**
 * Copyright (c) 2014 - 2019, Nordic Semiconductor ASA
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
 *
 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
 *
 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
/** @brief
 * Application to read the temperature over BLE.
 * Author : Abdelali Boussetta  @rmptxf
 * For :  Paarth
 */

#include <stdbool.h>
#include <stdint.h>
#include <string.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 "fds.h"
#include "peer_manager.h"
#include "peer_manager_handler.h"
#include "bsp_btn_ble.h"
#include "ble_conn_state.h"
#include "nrf_ble_gatt.h"
#include "nrf_ble_qwr.h"
#include "nrf_pwr_mgmt.h"

#include "ble_cus.h"

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

#define UART_PRINTING_ENABLED           1   

#define DEVICE_NAME                     "Tmp"                                   /**< Name of device. Will be included in the advertising data. */
#define MANUFACTURER_NAME               "Nordic"                                /**< 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_DURATION                18000                                   /**< The advertising duration (180 seconds) in units of 10 milliseconds. */
#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. */
NRF_BLE_QWR_DEF(m_qwr);                                                         /**< Context for the Queued Write module.*/
BLE_CUS_DEF(m_cus);                                                             /**< BLE Custom service definition. */
BLE_ADVERTISING_DEF(m_advertising);                                             /**< Advertising module instance. */

static uint16_t m_conn_handle = BLE_CONN_HANDLE_INVALID;                        /**< Handle of the current connection. */


static ble_uuid_t m_adv_uuids[] =                                               /**< Universally unique service identifiers. */
{
    {CUS_SERVICE_UUID, BLE_UUID_TYPE_VENDOR_BEGIN }
};


static void advertising_start(bool erase_bonds);

/**@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)
{
    pm_handler_on_pm_evt(p_evt);
    pm_handler_flash_clean(p_evt);

    switch (p_evt->evt_id)
    {
        case PM_EVT_PEERS_DELETE_SUCCEEDED:
            advertising_start(false);
            break;

        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.
    ret_code_t err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for the GAP initialization.
 *
 * @details This function sets up all the necessary GAP (Generic Access Profile) parameters of the
 *          device including the device name, appearance, and the preferred connection parameters.
 */
static void gap_params_init(void)
{
    ret_code_t              err_code;
    ble_gap_conn_params_t   gap_conn_params;
    ble_gap_conn_sec_mode_t sec_mode;

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);

    err_code = sd_ble_gap_device_name_set(&sec_mode,
                                          (const uint8_t *)DEVICE_NAME,
                                          strlen(DEVICE_NAME));
    APP_ERROR_CHECK(err_code);

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

    gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;
    gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;
    gap_conn_params.slave_latency     = SLAVE_LATENCY;
    gap_conn_params.conn_sup_timeout  = CONN_SUP_TIMEOUT;

    err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing the GATT module.
 */
static void gatt_init(void)
{
    ret_code_t err_code = nrf_ble_gatt_init(&m_gatt, NULL);
    APP_ERROR_CHECK(err_code);
}


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

/**@brief Function for handling the commands on the Neopixel controller service..
 *
 * @param[in]   commands   Array of data sent by the Neocontroller mobile app to update the Neopixel state.
 * @param[in]   lenght     The lenght of that array in bytes.
 */
static void command_handler(uint8_t const * commands, uint16_t  lenght)
{
   ret_code_t   err_code;

   #if UART_PRINTING_ENABLED
   for (uint8_t i=0; i<lenght; i++)
   {
      NRF_LOG_INFO("commands[%d] = %d;",i, commands[i]);
   }  
   #endif

// you can excute functions based on the command you receive here.

}

/**@brief Function for handling the Neocontroller Service events.
 *
 * @details This function will be called for all Custom Service ble events which are passed to
 *          the application.
 *
 * @param[in]   p_cus_service   Csutom Service structure.
 * @param[in]   p_evt           Event received from the Custom Service.
 *
 */
static void on_cus_evt(ble_cus_t  * p_cus_service, ble_cus_evt_t * p_evt)
{
    ret_code_t   err_code;

    switch(p_evt->evt_type)
    {
        case BLE_CUS_EVT_CONNECTED:
            break;

        case BLE_CUS_EVT_DISCONNECTED:
            break;

        case BLE_CUS_EVT_COMMAND_RX:
            #if UART_PRINTING_ENABLED
            NRF_LOG_INFO("command rerceived!");
            #endif
            command_handler(p_evt->params_command.command_data.p_data, p_evt->params_command.command_data.length);
            break;

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

/**@brief Function for initializing the Custom controller service.
 */
static void cus_service_init(void){

     ret_code_t          err_code;
     ble_cus_init_t      cus_init = {0};

     // temperature notification cccd write permission
     BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cus_init.temperature_char_attr_md.cccd_write_perm);
 
     // temperature char write&read opeartion permetted
     BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cus_init.temperature_char_attr_md.read_perm);
     BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&cus_init.temperature_char_attr_md.write_perm);

     // command characteristic write and read opeartions permissions
     BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&cus_init.command_char_attr_md.read_perm);
     BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cus_init.command_char_attr_md.write_perm);

     // service event handler
     cus_init.evt_handler        = on_cus_evt; 
     // service init
     err_code = ble_cus_init(&m_cus, &cus_init);
     APP_ERROR_CHECK(err_code);

 } 

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

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

    err_code = nrf_ble_qwr_init(&m_qwr, &qwr_init);
    APP_ERROR_CHECK(err_code);

    cus_service_init();

}


/**@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)
{
    ret_code_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)
{
    ret_code_t             err_code;
    ble_conn_params_init_t cp_init;

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

    cp_init.p_conn_params                  = NULL;
    cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
    cp_init.next_conn_params_update_delay  = NEXT_CONN_PARAMS_UPDATE_DELAY;
    cp_init.max_conn_params_update_count   = MAX_CONN_PARAMS_UPDATE_COUNT;
    cp_init.start_on_notify_cccd_handle    = BLE_GATT_HANDLE_INVALID;
    cp_init.disconnect_on_fail             = 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)
{
    ret_code_t err_code;

    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)
{
    ret_code_t err_code;

    switch (ble_adv_evt)
    {
        case BLE_ADV_EVT_FAST:
            #if UART_PRINTING_ENABLED
            NRF_LOG_INFO("Fast advertising started.");
            #endif
            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)
{
    ret_code_t err_code = NRF_SUCCESS;

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_DISCONNECTED:
            #if UART_PRINTING_ENABLED
            NRF_LOG_INFO("Disconnected.");
            #endif
            // LED indication will be changed when advertising starts.
            break;

        case BLE_GAP_EVT_CONNECTED:           
            #if UART_PRINTING_ENABLED
            NRF_LOG_INFO("Connected.");
            #endif
            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_qwr_conn_handle_assign(&m_qwr, m_conn_handle);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_GAP_EVT_PHY_UPDATE_REQUEST:
        {
            #if UART_PRINTING_ENABLED
            NRF_LOG_DEBUG("PHY update request.");
            #endif
            ble_gap_phys_t const phys =
            {
                .rx_phys = BLE_GAP_PHY_AUTO,
                .tx_phys = BLE_GAP_PHY_AUTO,
            };
            err_code = sd_ble_gap_phy_update(p_ble_evt->evt.gap_evt.conn_handle, &phys);
            APP_ERROR_CHECK(err_code);
        } break;

        case BLE_GATTC_EVT_TIMEOUT:
            // Disconnect on GATT Client timeout event.
            #if UART_PRINTING_ENABLED
            NRF_LOG_DEBUG("GATT Client Timeout.");
            #endif
            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.
            #if UART_PRINTING_ENABLED
            NRF_LOG_DEBUG("GATT Server Timeout.");
            #endif
            err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gatts_evt.conn_handle,
                                             BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            APP_ERROR_CHECK(err_code);
            break;

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


/**@brief Function for initializing the BLE stack.
 *
 * @details Initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    ret_code_t err_code;

    err_code = nrf_sdh_enable_request();
    APP_ERROR_CHECK(err_code);

    // Configure the BLE stack using the default settings.
    // Fetch the start address of the application RAM.
    uint32_t ram_start = 0;
    err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
    APP_ERROR_CHECK(err_code);

    // Enable BLE stack.
    err_code = nrf_sdh_ble_enable(&ram_start);
    APP_ERROR_CHECK(err_code);

    // Register a handler for BLE events.
    NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
}


/**@brief Function for the Peer Manager initialization.
 */
static void peer_manager_init(void)
{
    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 bond information from persistent storage.
 */
static void delete_bonds(void)
{
    ret_code_t err_code;
    #if UART_PRINTING_ENABLED
    NRF_LOG_INFO("Erase bonds!");
    #endif

    err_code = pm_peers_delete();
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing the Advertising functionality.
 */
static void advertising_init(void)
{
    ret_code_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      = false;
    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;
    #ifdef APP_ADV_DURATION
    init.config.ble_adv_fast_timeout  = APP_ADV_DURATION;
    #endif

    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 disconnecting.
*/
static void disconnect()
{
    ret_code_t  err_code;

    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);
    }
}

/**@brief Function for restarting the advertising without the whitelist.
*/
static void adv_restart_without_whitelist()
{
    ret_code_t  err_code;

    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);
       }
    }
}


/**@brief Function for handeling the buttons events.
*
*/
static void button_event_handler(uint8_t pin_no, uint8_t button_action)
{
  ret_code_t err_code;
  uint8_t  encoded_temperature[4];
  int32_t  raw_temperature = 0;     // signed 32 bit
  int8_t   temperature = 0;     // signed 8 bit

  switch(pin_no)
  {
   case BUTTON_1:
     if(button_action == APP_BUTTON_PUSH) 
     {           
        #ifdef UART_PRINTING_ENABLED
        NRF_LOG_INFO("button1 pressed.");
        #endif

        sd_temp_get(&raw_temperature);
        // temperature is in 0.25C° units. watch out for negative values!
        temperature = raw_temperature / 4;
        uint32_encode(raw_temperature, encoded_temperature);
        #ifdef UART_PRINTING_ENABLED
        NRF_LOG_INFO("temperature = %d.", temperature);
        for(uint8_t i=0; i<4;i++)
        {
            NRF_LOG_INFO("encoded_temperature[%d] = %d.", i, encoded_temperature[i]);
        }
        #endif
        if(m_conn_handle != BLE_CONN_HANDLE_INVALID)
        {
            err_code = temperature_value_update(&m_cus, encoded_temperature, sizeof(encoded_temperature));
            APP_ERROR_CHECK(err_code);
        }
        else 
        {
        #ifdef UART_PRINTING_ENABLED
        NRF_LOG_INFO("Ooops, you are not connected!");
        #endif
        }

     }
     else if(button_action == APP_BUTTON_RELEASE) 
     {
        #ifdef UART_PRINTING_ENABLED
        NRF_LOG_INFO("button1 released.");
        #endif
     }
     break;

   case BUTTON_2:
     if(button_action == APP_BUTTON_PUSH) 
     {
        #ifdef UART_PRINTING_ENABLED
        NRF_LOG_INFO("button2 pressed.");
        #endif
     }
     else if(button_action == APP_BUTTON_RELEASE) 
     {
        #ifdef UART_PRINTING_ENABLED
        NRF_LOG_INFO("button2 released.");
        #endif
     }
     break;

   case BUTTON_3:
     if(button_action == APP_BUTTON_PUSH) 
     {
        #ifdef UART_PRINTING_ENABLED
        NRF_LOG_INFO("button3 pressed.");
        #endif
     }
     else if(button_action == APP_BUTTON_RELEASE) 
     {
        #ifdef UART_PRINTING_ENABLED
        NRF_LOG_INFO("button3 released.");
        #endif
     }
     break;

   case BUTTON_4:
     if(button_action == APP_BUTTON_PUSH) 
     {
        #ifdef UART_PRINTING_ENABLED
        NRF_LOG_INFO("button4 pressed.");
        #endif
     }
     else if(button_action == APP_BUTTON_RELEASE) 
     {
        #ifdef UART_PRINTING_ENABLED
        NRF_LOG_INFO("button4 released.");
        #endif
     }
     break;
// you can define the folowing buttons in the components/boards/pca10056.h file.
#ifdef BUTTON_5
   case BUTTON_5:
     if(button_action == APP_BUTTON_PUSH) 
     {
        #ifdef UART_PRINTING_ENABLED
        NRF_LOG_INFO("button5 pressed.");
        #endif
     }
     else if(button_action == APP_BUTTON_RELEASE) 
     {
        sleep_mode_enter();
        #ifdef UART_PRINTING_ENABLED
        NRF_LOG_INFO("button5 released.");
        #endif
     }
     break;
#endif
#ifdef BUTTON_6
   case BUTTON_6:
     if(button_action == APP_BUTTON_PUSH) 
     {
        disconnect();
        #ifdef UART_PRINTING_ENABLED
        NRF_LOG_INFO("button6 pressed.");
        #endif
     }
     else if(button_action == APP_BUTTON_RELEASE) 
     {
        #ifdef UART_PRINTING_ENABLED
        NRF_LOG_INFO("button6 released.");
        #endif
     }
     break;
#endif
#ifdef BUTTON_7
   case BUTTON_7:
     if(button_action == APP_BUTTON_PUSH) 
     {
        adv_restart_without_whitelist();
        #ifdef UART_PRINTING_ENABLED
        NRF_LOG_INFO("button7 pressed.");
        #endif
     }
     else if(button_action == APP_BUTTON_RELEASE) 
     {
        #ifdef UART_PRINTING_ENABLED
        NRF_LOG_INFO("button7 released.");
        #endif
     }
     break;
#endif
    default:
        return; // no implementation needed
  }

}

/**@brief Function for buttons configuration.
 *
 */
static const app_button_cfg_t app_buttons[BUTTONS_NUMBER] = 
{
    {BUTTON_1, BUTTONS_ACTIVE_STATE, BUTTON_PULL, button_event_handler},
    {BUTTON_2, BUTTONS_ACTIVE_STATE, BUTTON_PULL, button_event_handler},
    {BUTTON_3, BUTTONS_ACTIVE_STATE, BUTTON_PULL, button_event_handler},
    {BUTTON_4, BUTTONS_ACTIVE_STATE, BUTTON_PULL, button_event_handler}
#ifdef BUTTON_5
   ,{BUTTON_5, BUTTONS_ACTIVE_STATE, BUTTON_PULL, button_event_handler},
#endif
#ifdef BUTTON_6
    {BUTTON_6, BUTTONS_ACTIVE_STATE, BUTTON_PULL, button_event_handler},
#endif
#ifdef BUTTON_7
    {BUTTON_7, BUTTONS_ACTIVE_STATE, BUTTON_PULL, button_event_handler}
#endif 
}; 


 /**@brief Function for initializing buttons.
 *
 * @param[out] p_erase_bonds  Will be true if the clear bonding button was pressed to wake the application up.
 */
void buttons_init(bool * p_erase_bonds)
{
    ret_code_t  err_code;
    bsp_event_t startup_event;

    err_code = app_button_init((app_button_cfg_t *)app_buttons,
                                                BUTTONS_NUMBER,
                                         BUTTON_DETECTION_TIME);
    APP_ERROR_CHECK(err_code);

    err_code = app_button_enable();
    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 initializing the leds with the bsp library.
 *
 */
static void leds_init()
{
    ret_code_t err_code;

    err_code = bsp_init(BSP_INIT_LEDS, NULL);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing the nrf log module.
 */
static void log_init(void)
{
    ret_code_t err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_DEFAULT_BACKENDS_INIT();
}


/**@brief Function for initializing power management.
 */
static void power_management_init(void)
{
    ret_code_t err_code;
    err_code = nrf_pwr_mgmt_init();
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling the idle state (main loop).
 *
 * @details If there is no pending log operation, then sleep until next the next event occurs.
 */
static void idle_state_handle(void)
{
    if (NRF_LOG_PROCESS() == false)
    {
        nrf_pwr_mgmt_run();
    }
}


/**@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_DELETED_SUCEEDED event
    }
    else
    {
        ret_code_t err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);

        APP_ERROR_CHECK(err_code);
    }
}


/**@brief Function for application main entry.
 */
int main(void)
{
    ret_code_t err_code;
    bool erase_bonds;
    #if UART_PRINTING_ENABLED
    log_init();
    #endif
    timers_init();
    buttons_init(&erase_bonds);
    leds_init();
    power_management_init();
    ble_stack_init();
    gap_params_init();
    gatt_init();
    services_init();
    advertising_init();
    conn_params_init();
    peer_manager_init();

    #if UART_PRINTING_ENABLED
    NRF_LOG_INFO("Application started.");
    #endif

    advertising_start(erase_bonds);

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

    }
}


/**
 * @}
 */
/**/