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SOFTDEVICE: ASSERTION FAILED SDK_15.2.0

What could be the cause for the SoftDevice: Assertion Failed error ? I am using nRF5_SDK_15.2.0 and the ble_app_template with some flash functions to update a config file. Any suggestions are appreciated.

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/** @file
 *
 * @defgroup ble_sdk_app_template_main main.c
 * @{
 * @ingroup ble_sdk_app_template
 * @brief Template project main file.
 *
 * This file contains a template for creating a new application. It has the code necessary to wakeup
 * from button, advertise, get a connection restart advertising on disconnect and if no new
 * connection created go back to system-off mode.
 * It can easily be used as a starting point for creating a new application, the comments identified
 * with 'YOUR_JOB' indicates where and how you can customize.
 */

#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_err.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 "boards.h"
#include "app_timer.h"
#include "fds.h"
#include "peer_manager.h"
//#include "peer_manager_handler.h"
#include "bsp_btn_ble.h"
#include "sensorsim.h"
#include "ble_conn_state.h"
#include "ble_lbs.h"
#include "nrf_ble_gatt.h"
#include "nrf_ble_qwr.h"
#include "nrf_pwr_mgmt.h"

#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
//PPOS + serial
#include "ppos_application.h"

#include "nrf_serial.h"


#define ADVERTISING_LED                 BSP_BOARD_LED_0                         /**< Is on when device is advertising. */
#define CONNECTED_LED                   BSP_BOARD_LED_1                         /**< Is on when device has connected. */
#define LEDBUTTON_LED                   BSP_BOARD_LED_2                         /**< LED to be toggled with the help of the LED Button Service. */
#define LEDBUTTON_BUTTON                BSP_BUTTON_0                            /**< Button that will trigger the notification event with the LED Button Service */

#define DEVICE_NAME                     "PPOS BLE Reader"                       /**< Name of device. Will be included in the advertising data. */
#define MANUFACTURER_NAME               "PinpointSystemsInc"                   /**< Manufacturer. Will be passed to Device Information Service. */
                               
#define APP_ADV_INTERVAL                64                                      /**< The advertising interval ). */
#define APP_ADV_DURATION                BLE_GAP_ADV_TIMEOUT_GENERAL_UNLIMITED   /**< 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(20000)                   /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY   APP_TIMER_TICKS(5000)                  /**< 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 BUTTON_DETECTION_DELAY          APP_TIMER_TICKS(50)                     /**< Delay from a GPIOTE event until a button is reported as pushed (in number of timer ticks). */


/*------------Serial ------------------*/
#define OP_QUEUES_SIZE          3
#define APP_TIMER_PRESCALER     NRF_SERIAL_APP_TIMER_PRESCALER


NRF_SERIAL_DRV_UART_CONFIG_DEF(m_uart0_drv_config,
                      ARDUINO_SCL_PIN, ARDUINO_SDA_PIN,
                      RTS_PIN_NUMBER, CTS_PIN_NUMBER,
                      NRF_UART_HWFC_DISABLED,
                      //NRF_UART_HWFC_ENABLED, 
                      NRF_UART_PARITY_EXCLUDED,
                      //NRF_UART_BAUDRATE_115200,
                      NRF_UART_BAUDRATE_9600,
                      UART_DEFAULT_CONFIG_IRQ_PRIORITY);

#define SERIAL_FIFO_TX_SIZE 32
//#define SERIAL_FIFO_RX_SIZE 32
#define SERIAL_FIFO_RX_SIZE 128

NRF_SERIAL_QUEUES_DEF(serial_queues, SERIAL_FIFO_TX_SIZE, SERIAL_FIFO_RX_SIZE);


#define SERIAL_BUFF_TX_SIZE 1
#define SERIAL_BUFF_RX_SIZE 1

NRF_SERIAL_BUFFERS_DEF(serial_buffs, SERIAL_BUFF_TX_SIZE, SERIAL_BUFF_RX_SIZE);

NRF_SERIAL_CONFIG_DEF(serial_config, NRF_SERIAL_MODE_POLLING, NULL, NULL, NULL, NULL);
//                      &serial_queues, &serial_buffs, NULL, sleep_handler);

//PPOS
#define STX 0x02
#define ACK 0x06
#define REQUEST_SETUP 0x0A

size_t bytesRead = 0;

NRF_SERIAL_UART_DEF(serial_uart, 0);


/*------------FDS ------------------*/
#define DEAD_BEEF                       0xDEADBEEF                              /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */
static volatile uint8_t write_flag=0;

#define FILE_ID 0x1111
#define REC_KEY 0x2222
/* Speedqueen Serialnumber. */ 
//static uint32_t SQ_SERIALNR = 0x00000000;
static uint32_t SQ_SERIALNR;
/* A record containing configuration data. */
static uint32_t const m_deadbeef[4] = {0x008D008E, 0x008C008B, 0x008A0032, 0x0A040104};   
fds_record_t record;
fds_record_desc_t record_desc;

/* A dummy structure to save in flash. */
typedef struct
{
    uint32_t boot_count;
    uint32_t serial_number;   
    uint32_t setup_string[4]; 
} configuration_t;

/* Dummy configuration data. */
static configuration_t m_dummy_cfg =
{    
    .boot_count  = 0x0,
    .serial_number = 0x0,
    .setup_string = {0x008D008E, 0x008C008B, 0x008A0032, 0x0A040104}   
};

/* A record containing dummy configuration data. */
static fds_record_t const m_dummy_record =
{
    .file_id           = FILE_ID,
    .key               = REC_KEY,
    .data.p_data       = &m_dummy_cfg,
    /* The length of a record is always expressed in 4-byte units (words). */
    .data.length_words = (sizeof(m_dummy_cfg) + 3) / sizeof(uint32_t),
};  


/*------------BLE ------------------*/
BLE_LBS_DEF(m_lbs);                                                             /**< LED Button Service instance. */
NRF_BLE_GATT_DEF(m_gatt);                                                       /**< GATT module instance. */
NRF_BLE_QWR_DEF(m_qwr);                                                         /**< Context for the Queued Write module.*/
//BLE_ADVERTISING_DEF(m_advertising);                                           /**< Advertising module instance. */

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

/* YOUR_JOB: Declare all services structure your application is using
 *  BLE_XYZ_DEF(m_xyz);
 */
static uint8_t m_adv_handle = BLE_GAP_ADV_SET_HANDLE_NOT_SET;                   /**< Advertising handle used to identify an advertising set. */
static uint8_t m_enc_advdata[BLE_GAP_ADV_SET_DATA_SIZE_MAX];                    /**< Buffer for storing an encoded advertising set. */
static uint8_t m_enc_scan_response_data[BLE_GAP_ADV_SET_DATA_SIZE_MAX];

// YOUR_JOB: Use UUIDs for service(s) used in your application.
static ble_gap_adv_data_t m_adv_data =                                              /**< Universally unique service identifiers. */
{
    .adv_data =
    {
        .p_data = m_enc_advdata,
        .len    = BLE_GAP_ADV_SET_DATA_SIZE_MAX
    },
    .scan_rsp_data =
    {
        .p_data = m_enc_scan_response_data,
        .len    = BLE_GAP_ADV_SET_DATA_SIZE_MAX

    }
};

/**@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 the LEDs initialization.
 *
 * @details Initializes all LEDs used by the application.
 */
static void leds_init(void)
{
    bsp_board_init(BSP_INIT_LEDS);
}


/**@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);

    // 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.
       ret_code_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)
{
    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);

    /* 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 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 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 handling write events to the LED characteristic.
 *
 * @param[in] p_lbs     Instance of LED Button Service to which the write applies.
 * @param[in] led_state Written/desired state of the LED.
 */
static void led_write_handler(uint16_t conn_handle, ble_lbs_t * p_lbs, uint8_t led_state)
{
    if (led_state)
    {
        bsp_board_led_on(LEDBUTTON_LED);
        NRF_LOG_INFO("Received LED ON!");
    }
    else
    {
        bsp_board_led_off(LEDBUTTON_LED);
        NRF_LOG_INFO("Received LED OFF!");
    }
}


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

    /* YOUR_JOB: Add code to initialize the services used by the application.
       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);
     */
       // Initialize LBS.
    init.led_write_handler = led_write_handler;

    err_code = ble_lbs_init(&m_lbs, &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)
{
    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 starting timers.
 */
static void application_timers_start(void)
{
    /* YOUR_JOB: Start your timers. below is an example of how to start a timer.
       ret_code_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)
{
    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:
            NRF_LOG_INFO("Fast advertising.");
            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 starting advertising.
 */
static void advertising_start(void)
{
    ret_code_t           err_code;

    err_code = sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);
    APP_ERROR_CHECK(err_code);

    bsp_board_led_on(ADVERTISING_LED);
}


/**@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;

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_DISCONNECTED:
            NRF_LOG_INFO("Disconnected.");
            // LED indication will be changed when advertising starts.
            bsp_board_led_off(CONNECTED_LED);
            m_conn_handle = BLE_CONN_HANDLE_INVALID;
            err_code = app_button_disable();
            APP_ERROR_CHECK(err_code);            
            advertising_start();
            break;

        case BLE_GAP_EVT_CONNECTED:
            NRF_LOG_INFO("Connected");
            bsp_board_led_on(CONNECTED_LED);
            bsp_board_led_off(ADVERTISING_LED);
            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);
            err_code = app_button_enable();
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
            // Pairing not supported
            err_code = sd_ble_gap_sec_params_reply(m_conn_handle,
                                                   BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP,
                                                   NULL,
                                                   NULL);
            APP_ERROR_CHECK(err_code);
            break;

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

        case BLE_GATTS_EVT_SYS_ATTR_MISSING:
            // No system attributes have been stored.
            err_code = sd_ble_gatts_sys_attr_set(m_conn_handle, NULL, 0, 0);
            APP_ERROR_CHECK(err_code);
            break;

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

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

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


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

    err_code = nrf_sdh_enable_request();
    APP_ERROR_CHECK(err_code);

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

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

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



/**@brief Function for handling events from the BSP module.
 *
 * @param[in] pin_no        The pin that the event applies to.
 * @param[in]   event   Event generated when button is pressed.
 */
static void button_event_handler(uint8_t pin_no, uint8_t button_action)
{
    ret_code_t err_code;

    switch (pin_no)
    {
        case LEDBUTTON_BUTTON:
            NRF_LOG_INFO("Send button state change.");
            err_code = ble_lbs_on_button_change(m_conn_handle, &m_lbs, button_action);
            if (err_code != NRF_SUCCESS &&
                err_code != BLE_ERROR_INVALID_CONN_HANDLE &&
                err_code != NRF_ERROR_INVALID_STATE &&
                err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)
            {
                APP_ERROR_CHECK(err_code);
            }
            break; // BSP_EVENT_DISCONNECT
        

        default:
            APP_ERROR_HANDLER(pin_no);
            break;
    }
}


/**@brief Function for initializing the Advertising functionality.
 */
static void advertising_init(void)
{
   ret_code_t    err_code;
    ble_advdata_t advdata;
    ble_advdata_t srdata;

    ble_uuid_t adv_uuids[] = {{LBS_UUID_SERVICE, m_lbs.uuid_type}};

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

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


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

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

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

    ble_gap_adv_params_t adv_params;

    // Set advertising parameters.
    memset(&adv_params, 0, sizeof(adv_params));

    adv_params.primary_phy     = BLE_GAP_PHY_1MBPS;
    adv_params.duration        = APP_ADV_DURATION;
    adv_params.properties.type = BLE_GAP_ADV_TYPE_CONNECTABLE_SCANNABLE_UNDIRECTED;
    adv_params.p_peer_addr     = NULL;
    adv_params.filter_policy   = BLE_GAP_ADV_FP_ANY;
    adv_params.interval        = APP_ADV_INTERVAL;

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


/**@brief Function for initializing buttons and leds.
 *
 * 
 */
static void buttons_init(void)
{
    ret_code_t err_code;

    //The array must be static because a pointer to it will be saved in the button handler module.
    static app_button_cfg_t buttons[] =
    {
        {LEDBUTTON_BUTTON, false, BUTTON_PULL, button_event_handler}
    };

    err_code = app_button_init(buttons, ARRAY_SIZE(buttons),
                               BUTTON_DETECTION_DELAY);
    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();
    }
}

/*------------------------FDS----------------------------*/
static void my_fds_evt_handler(fds_evt_t const * const p_fds_evt)
{
    switch (p_fds_evt->id)
    {
        case FDS_EVT_INIT:
            if (p_fds_evt->result != FDS_SUCCESS)
            {
                // Initialization failed.
            }
            break;
        case FDS_EVT_WRITE:
            if (p_fds_evt->result == FDS_SUCCESS)
            {
                write_flag = 1;
            }
            break;
        default:
            break;
    }
}

static ret_code_t fds_test_write(void)
{
//new record   
fds_record_t        record;
fds_record_desc_t   record_desc;
  
    // Set up data.
    record.data.p_data = m_deadbeef;
    record.data.length_words = 6;
    // Set up record.
    record.file_id              = FILE_ID;
    record.key         		= REC_KEY;   
    
    ret_code_t ret = fds_record_write(&record_desc, &record);
    if (ret != FDS_SUCCESS)
    {
        return ret;
    }
    NRF_LOG_INFO("Writing Record ID = %d \r\n", record_desc.record_id);
    return NRF_SUCCESS;
}

static ret_code_t fds_read(void)
{
    fds_flash_record_t flash_record;    
    fds_find_token_t ftok = {0}; // Important, make sure you zero init the ftok token
    uint32_t * data;
    uint32_t err_code;

    NRF_LOG_INFO("Start searching... \r\n");
    // Loop until all records with the given key and file ID have been found.
    while (fds_record_find(FILE_ID, REC_KEY, &record_desc, &ftok) == FDS_SUCCESS)
    {       
        
        err_code = fds_record_open(&record_desc, &flash_record);
        if (err_code != FDS_SUCCESS)
        {
            return err_code;
        }

        NRF_LOG_INFO("Found Record ID = %d\r\n", record_desc.record_id);
        NRF_LOG_INFO("Data = ");
        data = (uint32_t *)flash_record.p_data;
        for (uint8_t i = 0; i < flash_record.p_header->length_words; i++)
        {
            NRF_LOG_INFO("0x%8x ", data[i]);
        }
        NRF_LOG_INFO("\r\n");
        // Access the record through the flash_record structure.        
        // Close the record when done.
        err_code = fds_record_close(&record_desc);
        if (err_code != FDS_SUCCESS)
        {
            return err_code;
        }
    }
    return NRF_SUCCESS;
}

static ret_code_t fds_config_find_and_update(void)
{    
    fds_find_token_t ftok;

    ftok.page = 0;
    ftok.p_addr = NULL;
    // Find records with same ID and rec key .     
    ret_code_t ret = fds_record_find(FILE_ID, REC_KEY, &record_desc, &ftok);

    if (ret == FDS_SUCCESS)
    {
        /* A config file is in flash. Let's update it. */
        fds_flash_record_t config = {0};

        /* Open the record and read its contents. */
        ret = fds_record_open(&record_desc, &config);
        APP_ERROR_CHECK(ret);

        /* Copy the configuration from flash into m_dummy_cfg. */
        memcpy(&m_dummy_cfg, config.p_data, sizeof(configuration_t));

        NRF_LOG_INFO("Config file found, updating boot count to %d.", m_dummy_cfg.boot_count);

        /* Update boot count, serialnr . */
        m_dummy_cfg.boot_count++;
        m_dummy_cfg.serial_number = SQ_SERIALNR;
        m_dummy_cfg.setup_string[4] = m_deadbeef;

        /* Close the record when done reading. */
        ret = fds_record_close(&record_desc);
        APP_ERROR_CHECK(ret);

        /* Write the updated record to flash. */
        ret = fds_record_update(&record_desc, &m_dummy_record);
        APP_ERROR_CHECK(ret);
    }
}

static ret_code_t fds_config_find_and_write(void)
{    
    fds_record_desc_t record_desc = {0};
    fds_find_token_t ftok;

    ftok.page = 0;
    ftok.p_addr = NULL;
    // Find records with same ID and rec key .     
    ret_code_t ret = fds_record_find(FILE_ID, REC_KEY, &record_desc, &ftok); 
    
    if (ret != FDS_SUCCESS)
    {
        /* System config not found; write a new one. */
        NRF_LOG_INFO("Writing config file...");

        ret = fds_record_write(&record_desc, &m_dummy_record);
        APP_ERROR_CHECK(ret);
    }    
    return NRF_SUCCESS;
}

static ret_code_t fds_test_find_and_delete(void)
{   
    fds_find_token_t ftok;

    ftok.page = 0;
    ftok.p_addr = NULL;
    // Loop and find records with same ID and rec key and mark them as deleted.
    while (fds_record_find(FILE_ID, REC_KEY, &record_desc, &ftok) == FDS_SUCCESS)
    {
        fds_record_delete(&record_desc);
        NRF_LOG_INFO("Deleted record ID: %d \r\n", record_desc.record_id);
    }
    // call the garbage collector to empty them, don't need to do this all the time, this is just
    // for demonstration
    ret_code_t ret = fds_gc();
    if (ret != FDS_SUCCESS)
    {
        return ret;
    }
    return NRF_SUCCESS;
} 

static ret_code_t fds_config_init(void)
{
     /* Register first to receive an event when initialization is complete. */
    ret_code_t ret = fds_register(my_fds_evt_handler);
    if (ret != FDS_SUCCESS)
    {
        return ret;
    }
    ret = fds_init();
    if (ret != FDS_SUCCESS)
    {
        return ret;
    }

    return NRF_SUCCESS;
}
/*------------FDS end--------------*/


/**@brief Function for application main entry.
 */
int main(void)
{
    ret_code_t err_code;
    //PPOS
    static char commandArray[] = {0x02, 0x09, 0x73, 0x00, 0x00, 0x00, 0x02, 0x01, 0x10, 0x00, 0x02, 0x69};
    uint8_t statusRequestArray[] = {0x06, 0x02, 0x01, 0x70, 0x73};
    uint8_t vendPriceArray[] = {0x06, 0x02, 0x0a, 0x72, 0x39, 0x39, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7a};
    uint8_t initResponseBuf[64] = {0};
    uint8_t machineStatusBuf[64] = {0};
    uint8_t ACKbyte[1] = {0};
  //Variables
    uint8_t OP; //  
    uint8_t EepromDataBuf[64] = {0};

   
    // Initialize.
    log_init();
    leds_init();
    timers_init();
    buttons_init();
    power_management_init();
    ble_stack_init();
    gap_params_init();
    gatt_init();
    services_init();
    advertising_init();
    conn_params_init();
    
    err_code = fds_config_init();    
    APP_ERROR_CHECK(err_code);
    err_code = fds_config_find_and_write();
    APP_ERROR_CHECK(err_code);        
    //err_code = fds_test_find_and_delete();
    //APP_ERROR_CHECK(err_code);    
    //err_code = fds_test_write();
    //APP_ERROR_CHECK(err_code);    
    //wait until the write is finished. 
    //while (write_flag==0);
    //fds_read();
/*
// Initialize serial
    err_code = nrf_serial_init(&serial_uart, &m_uart0_drv_config, &serial_config);
    APP_ERROR_CHECK(err_code);
    //send 0x73
    err_code = nrf_serial_write(&serial_uart, commandArray, 12, NULL, 0);
    APP_ERROR_CHECK(err_code);
    //receive 0x74
    err_code = nrf_serial_read(&serial_uart, &initResponseBuf[0], 35, &bytesRead, 60);
    APP_ERROR_CHECK(err_code);
    err_code = fill_InitResponse_Packet(initResponseBuf, 16);
    //send 0x70
    err_code = nrf_serial_write(&serial_uart, &statusRequestArray[0], 5, NULL, 0);
    APP_ERROR_CHECK(err_code);
    //receive 0x71
    err_code = nrf_serial_read(&serial_uart, &machineStatusBuf[0], 30, &bytesRead, 60);
    APP_ERROR_CHECK(err_code);
    err_code = fill_MachineStatus_Packet(machineStatusBuf, 25);
    //send 0x72
    err_code = nrf_serial_write(&serial_uart, &vendPriceArray[0], 14, NULL, 0);
    APP_ERROR_CHECK(err_code);
    //receive ACK
    err_code = nrf_serial_read(&serial_uart, &ACKbyte[0], 1, &bytesRead, 5);
    APP_ERROR_CHECK(err_code);
  //send Firmware Version
*/ 
    //cast uint8_t to uint32_t   
    uint8_t someBuf[] = {0x21, 0x58, 0x60, 0x00};   //0x21586000 
    SQ_SERIALNR = someBuf[3] | someBuf[2] << 8 | someBuf[1] << 16 | someBuf[0] << 24;
    
    err_code = fds_config_find_and_update();
    APP_ERROR_CHECK(err_code);     
    //wait until the write is finished. 
    while (write_flag==0);
    fds_read();

    // Start execution.
    NRF_LOG_INFO("PPOS Reader started.");
    application_timers_start();

    advertising_start();

    // Enter main loop.
    for (;;)
    {
     idle_state_handle();
/*    
    //send 0x70
     err_code = nrf_serial_write(&serial_uart, &statusRequestArray[0], 5, NULL, 0);
     APP_ERROR_CHECK(err_code);
    //receive 0x71
     err_code = nrf_serial_read(&serial_uart, &machineStatusBuf[0], 30, &bytesRead, 55);
     APP_ERROR_CHECK(err_code);
    //send 0x72
     err_code = nrf_serial_write(&serial_uart, &vendPriceArray[0], 14, NULL, 0);
     APP_ERROR_CHECK(err_code);
    //receive ACK
     err_code = nrf_serial_read(&serial_uart, &ACKbyte[0], 1, &bytesRead, 5);
     APP_ERROR_CHECK(err_code);
*/
    }
}


/**
 * @}
 */

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