how to receive data with ble_app_multilink_central ?

[dhia1994]

// code to receive data
void getData(uint8_t* recData,uint8_t* saveData, uint8_t index)
	{
		saveData[index] = recData[index];
		
}

void  nus_data_handler(ble_nus_t *p_nus, uint8_t * p_data, uint16_t length) 
{
for (uint32_t i = 0; i < length; i++)
{
getData(p_data, bleRecData, i);
	NRF_LOG_INFO("Receive\n");

    while(app_uart_put(p_data[i]) != NRF_SUCCESS);
}
while(app_uart_put('\n') != NRF_SUCCESS); 
}



// initialization of services
void services_init(void)
{
    uint32_t       err_code;
    ble_nus_init_t nus_init;

    memset(&nus_init, 0, sizeof(nus_init)); 
	
    nus_init.data_handler = nus_data_handler;

    err_code = ble_nus_init(&m_nus,&nus_init);
	
    APP_ERROR_CHECK(err_code);
    
    
//int main
int main(void)
{
    ret_code_t err_code;

    err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);
    NRF_LOG_INFO(" Multilink Example\r\n");
	
    leds_init();
    APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, NULL);
    buttons_init();
    ble_stack_init();
    services_init();
    db_discovery_init();
    lbs_c_init();
    uart_init();
	  
    // Start scanning for peripherals and initiate connection to devices which advertise.
    scan_start();
    // Turn on the LED to signal scanning.
    bsp_board_led_on(CENTRAL_SCANNING_LED);

    for (;;)
    {
        if (NRF_LOG_PROCESS() == false)
        {
            // Wait for BLE events.
            power_manage();
        }
    }
}

    
    
    

	
	
	
}

I have a problem that bothers me for days.

I try to run this code on nrf51 to receive data from anathor nrf51 

please i need help for my final project  

[dhia1994]

/**
 * Copyright (c) 2014 - 2017, Nordic Semiconductor ASA
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 * 
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 * 
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
 * 
 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
 * 
 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 */

/**
 * @brief BLE LED Button Service central and client application main file.
 *
 * This example can be a central for up to 8 peripherals.
 * The peripheral is called ble_app_blinky and can be found in the ble_peripheral
 * folder.
 */

#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "nordic_common.h"
#include "softdevice_handler.h"
#include "app_timer.h"
#include "boards.h"
#include "bsp.h"
#include "bsp_btn_ble.h"
#include "ble.h"
#include "ble_hci.h"
#include "app_uart.h"
#include "ble_advdata.h"
#include "ble_advertising.h"
#include "ble_conn_params.h"
#include "ble_db_discovery.h"
#include "ble_lbs_c.h"
#include "ble_nus.h"
#include "SEGGER_RTT.h"
#include "pca10028.h"
#include "ble_conn_state.h"
#define NRF_LOG_MODULE_NAME "APP"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_uart.h"



#if (NRF_SD_BLE_API_VERSION == 3)
#define NRF_BLE_MAX_MTU_SIZE      GATT_MTU_SIZE_DEFAULT                      /**< MTU size used in the softdevice enabling and to reply to a BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST event. */
#endif

#define CENTRAL_LINK_COUNT        8                                          /**< Number of central links used by the application. When changing this number remember to adjust the RAM settings*/
#define PERIPHERAL_LINK_COUNT     0                                          /**< Number of peripheral links used by the application. When changing this number remember to adjust the RAM settings*/
#define TOTAL_LINK_COUNT          CENTRAL_LINK_COUNT + PERIPHERAL_LINK_COUNT /**< Total number of links used by the application. */

#define CENTRAL_SCANNING_LED      BSP_BOARD_LED_0
#define CENTRAL_CONNECTED_LED     BSP_BOARD_LED_1

#define APP_TIMER_PRESCALER       0                                          /**< Value of the RTC1 PRESCALER register. */
#define APP_TIMER_MAX_TIMERS      (2 + BSP_APP_TIMERS_NUMBER)                  /**< Maximum number of timers used by the application. */
#define APP_TIMER_OP_QUEUE_SIZE   2                                          /**< Size of timer operation queues. */

#define SCAN_INTERVAL             0x00A0                                     /**< Determines scan interval in units of 0.625 millisecond. */
#define SCAN_WINDOW               0x0050                                     /**< Determines scan window in units of 0.625 millisecond. */
#define SCAN_TIMEOUT              0x0000                                     /**< Timout when scanning. 0x0000 disables timeout. */

#define MIN_CONNECTION_INTERVAL   MSEC_TO_UNITS(7.5, UNIT_1_25_MS)           /**< Determines minimum connection interval in milliseconds. */
#define MAX_CONNECTION_INTERVAL   MSEC_TO_UNITS(30, UNIT_1_25_MS)            /**< Determines maximum connection interval in milliseconds. */
#define SLAVE_LATENCY             0                                          /**< Determines slave latency in terms of connection events. */
#define SUPERVISION_TIMEOUT       MSEC_TO_UNITS(4000, UNIT_10_MS)            /**< Determines supervision time-out in units of 10 milliseconds. */

#define UUID16_SIZE               2                                          /**< Size of a UUID, in bytes. */

#define LEDBUTTON_LED             BSP_BOARD_LED_2                            /**< LED to indicate a change of state of the the Button characteristic on the peer. */

#define LEDBUTTON_BUTTON_PIN      BSP_BUTTON_0                               /**< Button that will write to the LED characteristic of the peer */
#define BUTTON_DETECTION_DELAY    APP_TIMER_TICKS(50, APP_TIMER_PRESCALER)   /**< Delay from a GPIOTE event until a button is reported as pushed (in number of timer ticks). */

#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(20, UNIT_1_25_MS)             /**< Minimum acceptable connection interval (20 ms), Connection interval uses 1.25 ms units. */
#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(75, UNIT_1_25_MS)             /**< Maximum acceptable connection interval (75 ms), Connection interval uses 1.25 ms units. */
#define CONN_SUP_TIMEOUT                MSEC_TO_UNITS(4000, UNIT_10_MS)             /**< Connection supervisory timeout (4 seconds), Supervision Timeout uses 10 ms units. */

#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_PARAMS_UPDATE_COUNT    3                                           /**< Number of attempts before giving up the connection parameter negotiation. */

static const char m_target_periph_name[] = "DHIA_VRRR";                  /**< Name of the device we try to connect to. This name is searched for in the scan report data*/

 ble_nus_t                        m_nus;   
 uint8_t bleRecData[256];

extern ble_nus_t m_nus; /**< Structure to identify the Nordic UART Service. */
extern uint16_t m_conn_handle; /**< Handle of the current connection. */
/** @brief Scan parameters requested for scanning and connection. */
static const ble_gap_scan_params_t m_scan_params =
{
    .active   = 0,
    .interval = SCAN_INTERVAL,
    .window   = SCAN_WINDOW,
    .timeout  = SCAN_TIMEOUT,

    #if (NRF_SD_BLE_API_VERSION == 2)
        .selective   = 0,
        .p_whitelist = NULL,
    #endif

    #if (NRF_SD_BLE_API_VERSION == 3)
        .use_whitelist  = 0,
        .adv_dir_report = 0,
    #endif
};


/**@brief Connection parameters requested for connection. */
static const ble_gap_conn_params_t m_connection_param =
{
    (uint16_t)MIN_CONNECTION_INTERVAL,
    (uint16_t)MAX_CONNECTION_INTERVAL,
    (uint16_t)SLAVE_LATENCY,
    (uint16_t)SUPERVISION_TIMEOUT
};

static ble_lbs_c_t        m_ble_lbs_c[TOTAL_LINK_COUNT];           /**< Main structures used by the LED Button client module. */
static uint8_t            m_ble_lbs_c_count;                       /**< Keeps track of how many instances of LED Button client module have been initialized. >*/
static ble_db_discovery_t m_ble_db_discovery[TOTAL_LINK_COUNT];    /**< list of DB structures used by the database discovery module. */

/**@brief Function to handle 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] p_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(0xDEADBEEF, line_num, p_file_name);
}


void getData(uint8_t* recData,uint8_t* saveData, uint8_t index)
	{
		saveData[index] = recData[index];
}

 void  nus_data_handler(ble_nus_t *p_nus, uint8_t * p_data, uint16_t length) 
{
for (uint32_t i = 0; i < length; i++)
{
getData(p_data, bleRecData, i);
NRF_LOG_INFO("Receive  \n");
    while(app_uart_put(p_data[i]) != NRF_SUCCESS);
}
while(app_uart_put('\n') != NRF_SUCCESS); 
}



/**@brief Function for the LEDs initialization.
 *
 * @details Initializes all LEDs used by the application.
 */
static void leds_init(void)
{
    bsp_board_leds_init();
}


/**
 * @brief Parses advertisement data, providing length and location of the field in case
 *        matching data is found.
 *
 * @param[in]  type       Type of data to be looked for in advertisement data.
 * @param[in]  p_advdata  Advertisement report length and pointer to report.
 * @param[out] p_typedata If data type requested is found in the data report, type data length and
 *                        pointer to data will be populated here.
 *
 * @retval NRF_SUCCESS if the data type is found in the report.
 * @retval NRF_ERROR_NOT_FOUND if the data type could not be found.
 */
static uint32_t adv_report_parse(uint8_t type, uint8_array_t * p_advdata, uint8_array_t * p_typedata)
{
    uint32_t  index = 0;
    uint8_t * p_data;

    p_data = p_advdata->p_data;

    while (index < p_advdata->size)
    {
        uint8_t field_length = p_data[index];
        uint8_t field_type   = p_data[index + 1];

        if (field_type == type)
        {
            p_typedata->p_data = &p_data[index + 2];
            p_typedata->size   = field_length - 1;
            return NRF_SUCCESS;
        }
        index += field_length + 1;
    }
    return NRF_ERROR_NOT_FOUND;
}


/**@brief Function to start scanning.
 */
static void scan_start(void)
{
    ret_code_t ret;

    (void) sd_ble_gap_scan_stop();

    NRF_LOG_INFO("Start scanning for device name %s.\r\n", (uint32_t)m_target_periph_name);
    ret = sd_ble_gap_scan_start(&m_scan_params);
    APP_ERROR_CHECK(ret);

    ret = bsp_indication_set(BSP_INDICATE_SCANNING);
    APP_ERROR_CHECK(ret);
}



/**@brief Handles events coming from the LED Button central module.
 *
 * @param[in] p_lbs_c     The instance of LBS_C that triggered the event.
 * @param[in] p_lbs_c_evt The LBS_C event.
 */
static void lbs_c_evt_handler(ble_lbs_c_t * p_lbs_c, ble_lbs_c_evt_t * p_lbs_c_evt)
{
    switch (p_lbs_c_evt->evt_type)
    {
        case BLE_LBS_C_EVT_DISCOVERY_COMPLETE:
        {
            ret_code_t err_code;

            NRF_LOG_INFO("LED Button service discovered on conn_handle 0x%x\r\n",
                    p_lbs_c_evt->conn_handle);

            err_code = app_button_enable();
            APP_ERROR_CHECK(err_code);

            // LED Button service discovered. Enable notification of Button.
            err_code = ble_lbs_c_button_notif_enable(p_lbs_c);
            APP_ERROR_CHECK(err_code);
        } break; // BLE_LBS_C_EVT_DISCOVERY_COMPLETE

        case BLE_LBS_C_EVT_BUTTON_NOTIFICATION:
        {
            NRF_LOG_INFO("Link 0x%x, Button state changed on peer to 0x%x\r\n",
                           p_lbs_c_evt->conn_handle,
                           p_lbs_c_evt->params.button.button_state);
            if (p_lbs_c_evt->params.button.button_state)
            {
                bsp_board_led_on(LEDBUTTON_LED);
            }
            else
            {
                bsp_board_led_off(LEDBUTTON_LED);
            }
        } break; // BLE_LBS_C_EVT_BUTTON_NOTIFICATION

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

/**@brief Function for handling the advertising report BLE event.
 *
 * @param[in] p_ble_evt  Bluetooth stack event.
 */
static void on_adv_report(const ble_evt_t * const p_ble_evt)
{
    uint32_t      err_code;
    uint8_array_t adv_data;
    uint8_array_t dev_name;
    bool          do_connect = false;

    // For readibility.
    const ble_gap_evt_t * const p_gap_evt    = &p_ble_evt->evt.gap_evt;
    const ble_gap_addr_t  * const peer_addr  = &p_gap_evt->params.adv_report.peer_addr;

    // Initialize advertisement report for parsing
    adv_data.p_data = (uint8_t *)p_gap_evt->params.adv_report.data;
    adv_data.size   = p_gap_evt->params.adv_report.dlen;


    //search for advertising names
    bool found_name = false;
    err_code = adv_report_parse(BLE_GAP_AD_TYPE_COMPLETE_LOCAL_NAME,
                                &adv_data,
                                &dev_name);
    if (err_code != NRF_SUCCESS)
    {
        // Look for the short local name if it was not found as complete
        err_code = adv_report_parse(BLE_GAP_AD_TYPE_SHORT_LOCAL_NAME, &adv_data, &dev_name);
        if (err_code != NRF_SUCCESS)
        {
            // If we can't parse the data, then exit
            return;
        }
        else
        {
            found_name = true;
        }
    }
    else
    {
        found_name = true;
    }
    if (found_name)
    {
        if (strlen(m_target_periph_name) != 0)
        {
            if (memcmp(m_target_periph_name, dev_name.p_data, dev_name.size) == 0)
            {
                do_connect = true;
						NRF_LOG_INFO("the device %s is connected now .\r\n", (uint32_t)m_target_periph_name);
            }
        }
    }

    if (do_connect)
    {
        // Initiate connection.
        err_code = sd_ble_gap_connect(peer_addr, &m_scan_params, &m_connection_param);
        if (err_code != NRF_SUCCESS)
        {
            NRF_LOG_ERROR("Connection Request Failed, reason %d\r\n", err_code);
        }
    }
}

/**@brief Function for handling BLE Stack events concerning central applications.
 *
 * @details This function keeps the connection handles of central applications up-to-date. It
 *          parses scanning reports, initiating a connection attempt to peripherals when a
 *          target UUID is found, and manages connection parameter update requests. Additionally,
 *          it updates the status of LEDs used to report central applications activity.
 *
 * @note Since this function updates connection handles, @ref BLE_GAP_EVT_DISCONNECTED events
 *       should be dispatched to the target application before invoking this function.
 *
 * @param[in] p_ble_evt  Bluetooth stack event.
 */
static void on_ble_evt(const ble_evt_t * const p_ble_evt)
{
    ret_code_t err_code;

    // For readability.
    const ble_gap_evt_t * const p_gap_evt = &p_ble_evt->evt.gap_evt;

    switch (p_ble_evt->header.evt_id)
    {
        // Upon connection, check which peripheral has connected, initiate DB
        // discovery, update LEDs status and resume scanning if necessary.
        case BLE_GAP_EVT_CONNECTED:
        {
            NRF_LOG_INFO("Connection 0x%x established, starting DB discovery.\r\n",
                         p_gap_evt->conn_handle);
            APP_ERROR_CHECK_BOOL(p_gap_evt->conn_handle < TOTAL_LINK_COUNT);

            err_code = ble_lbs_c_handles_assign(&m_ble_lbs_c[p_gap_evt->conn_handle],
                                                p_gap_evt->conn_handle,
                                                NULL);
            APP_ERROR_CHECK(err_code);

            err_code = ble_db_discovery_start(&m_ble_db_discovery[p_gap_evt->conn_handle],
                                              p_gap_evt->conn_handle);
            if (err_code != NRF_ERROR_BUSY)
            {
                APP_ERROR_CHECK(err_code);
            }

            // Update LEDs status, and check if we should be looking for more
            // peripherals to connect to.
            bsp_board_led_on(CENTRAL_CONNECTED_LED);
            if (ble_conn_state_n_centrals() == CENTRAL_LINK_COUNT)
            {
                bsp_board_led_off(CENTRAL_SCANNING_LED);
            }
            else
            {
                // Resume scanning.
                bsp_board_led_on(CENTRAL_SCANNING_LED);
                scan_start();
            }
        } break; // BLE_GAP_EVT_CONNECTED

        // Upon disconnection, reset the connection handle of the peer which disconnected, update
        // the LEDs status and start scanning again.
        case BLE_GAP_EVT_DISCONNECTED:
        {
            uint32_t central_link_cnt; // Number of central links.

            NRF_LOG_INFO("LBS central link 0x%x disconnected (reason: 0x%x)\r\n",
                         p_gap_evt->conn_handle,
                         p_gap_evt->params.disconnected.reason);

            err_code = app_button_disable();
            APP_ERROR_CHECK(err_code);

            // Start scanning
            scan_start();

            // Update LEDs status.
            bsp_board_led_on(CENTRAL_SCANNING_LED);
            central_link_cnt = ble_conn_state_n_centrals();
            if (central_link_cnt == 0)
            {
                bsp_board_led_off(CENTRAL_CONNECTED_LED);
            }
        } break;

        case BLE_GAP_EVT_ADV_REPORT:
            on_adv_report(p_ble_evt);
            break;

        case BLE_GAP_EVT_TIMEOUT:
        {
            // We have not specified a timeout for scanning, so only connection attemps can timeout.
            if (p_gap_evt->params.timeout.src == BLE_GAP_TIMEOUT_SRC_CONN)
            {
                NRF_LOG_DEBUG("Connection request timed out.\r\n");
            }
        } break;

        case BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST:
        {
            // Accept parameters requested by peer.
            err_code = sd_ble_gap_conn_param_update(p_gap_evt->conn_handle,
                                        &p_gap_evt->params.conn_param_update_request.conn_params);
            APP_ERROR_CHECK(err_code);
        } break;

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

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

#if (NRF_SD_BLE_API_VERSION == 3)
        case BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST:
            err_code = sd_ble_gatts_exchange_mtu_reply(p_ble_evt->evt.gatts_evt.conn_handle,
                                                       NRF_BLE_MAX_MTU_SIZE);
            APP_ERROR_CHECK(err_code);
            break; // BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST
#endif

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

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(0,
		BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
		APP_ERROR_CHECK(err_code);
	}
}

void conn_params_error_handler(uint32_t nrf_error) {
	APP_ERROR_HANDLER(nrf_error);
}

void conn_params_init(void)
{
    uint32_t               err_code;
    ble_conn_params_init_t cp_init;

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

    cp_init.p_conn_params                  = NULL;
    cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
    cp_init.next_conn_params_update_delay  = NEXT_CONN_PARAMS_UPDATE_DELAY;
    cp_init.max_conn_params_update_count   = MAX_CONN_PARAMS_UPDATE_COUNT;
    cp_init.start_on_notify_cccd_handle    = BLE_GATT_HANDLE_INVALID;
    cp_init.disconnect_on_fail             = false;
    cp_init.evt_handler                    = on_conn_params_evt;
    cp_init.error_handler                  = conn_params_error_handler;

    err_code = ble_conn_params_init(&cp_init);
    APP_ERROR_CHECK(err_code);
	
}

void gap_params_init(char * device_name)
{
    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);
		err_code = sd_ble_gap_appearance_set(BLE_APPEARANCE_GENERIC_PHONE);
       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 dispatching a BLE stack event to all modules with a BLE stack event handler.
 *
 * @details This function is called from the scheduler in the main loop 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)
{
    uint16_t conn_handle;
    conn_handle = p_ble_evt->evt.gap_evt.conn_handle;

    ble_conn_state_on_ble_evt(p_ble_evt);
    on_ble_evt(p_ble_evt);

    // Make sure taht an invalid connection handle are not passed since
    // our array of modules is bound to TOTAL_LINK_COUNT.
    if (conn_handle < TOTAL_LINK_COUNT)
    {
        ble_db_discovery_on_ble_evt(&m_ble_db_discovery[conn_handle], p_ble_evt);
        ble_lbs_c_on_ble_evt(&m_ble_lbs_c[conn_handle], p_ble_evt);
    }
}


/**@brief LED Button collector initialization.
 */
static void lbs_c_init(void)
{
    uint32_t         err_code;
    ble_lbs_c_init_t lbs_c_init_obj;

    lbs_c_init_obj.evt_handler = lbs_c_evt_handler;

    for (m_ble_lbs_c_count = 0; m_ble_lbs_c_count < TOTAL_LINK_COUNT; m_ble_lbs_c_count++)
    {
        err_code = ble_lbs_c_init(&m_ble_lbs_c[m_ble_lbs_c_count], &lbs_c_init_obj);
        APP_ERROR_CHECK(err_code);
    }
    m_ble_lbs_c_count = 0;
}

void services_init(void)
{
    uint32_t       err_code;
    ble_nus_init_t nus_init;

    memset(&nus_init, 0, sizeof(nus_init)); 
	
    nus_init.data_handler = nus_data_handler ;

    err_code = ble_nus_init(&m_nus,&nus_init);
	
    APP_ERROR_CHECK(err_code);

	
	
	
}

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

    // Use the max config: 8 central, 0 periph, 10 VS UUID
    ble_enable_params.common_enable_params.vs_uuid_count = 10;

    // Check the ram settings against the used number of links
    CHECK_RAM_START_ADDR(CENTRAL_LINK_COUNT,PERIPHERAL_LINK_COUNT);

    // Enable BLE stack.
#if (NRF_SD_BLE_API_VERSION == 3)
    ble_enable_params.gatt_enable_params.att_mtu = NRF_BLE_MAX_MTU_SIZE;
#endif
    err_code = softdevice_enable(&ble_enable_params);
    APP_ERROR_CHECK(err_code);

    // Register with the SoftDevice handler module for BLE events.
    err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function to write to the LED characterestic of all connected clients.
 *
 * @details Based on if the button is pressed or released, we write a high or low LED status to
 *          the server.
 *
 * @param[in] button_action The button action (press/release).
 *            Determines if the LEDs of the servers will be ON or OFF.
 *
 * @return NRF_SUCCESS on success, else the error code from ble_lbs_led_status_send.
 */
static uint32_t led_status_send_to_all(uint8_t button_action)
{
    uint32_t err_code;

    for (uint32_t i = 0; i< CENTRAL_LINK_COUNT; i++)
    {
        err_code = ble_lbs_led_status_send(&m_ble_lbs_c[i], button_action);
        if (err_code != NRF_SUCCESS &&
            err_code != BLE_ERROR_INVALID_CONN_HANDLE &&
            err_code != NRF_ERROR_INVALID_STATE)
        {
            return err_code;
        }
    }
        return NRF_SUCCESS;
}


/**@brief Function for handling events from the button handler module.
 *
 * @param[in] pin_no        The pin that the event applies to.
 * @param[in] button_action The button action (press/release).
 */
static void button_event_handler(uint8_t pin_no, uint8_t button_action)
{
    uint32_t err_code;

    switch (pin_no)
    {
        case LEDBUTTON_BUTTON_PIN:
            err_code = led_status_send_to_all(button_action);
            if (err_code == NRF_SUCCESS)
            {
                NRF_LOG_INFO("LBS write LED state %d\r\n", button_action);
            }
            break;

        default:
            APP_ERROR_HANDLER(pin_no);
            break;
    }
}


/**@brief Function for initializing the button handler module.
 */
static void buttons_init(void)
{
    uint32_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_PIN, false, BUTTON_PULL, button_event_handler}
    };

    err_code = app_button_init(buttons, sizeof(buttons) / sizeof(buttons[0]),
                               BUTTON_DETECTION_DELAY);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling database discovery events.
 *
 * @details This function is callback function to handle events from the database discovery module.
 *          Depending on the UUIDs that are discovered, this function should forward the events
 *          to their respective services.
 *
 * @param[in] p_event  Pointer to the database discovery event.
 */
static void db_disc_handler(ble_db_discovery_evt_t * p_evt)
{
    NRF_LOG_INFO("call to ble_lbs_on_db_disc_evt for instance %d and link 0x%x!\r\n",
                    p_evt->conn_handle,
                    p_evt->conn_handle);
    ble_lbs_on_db_disc_evt(&m_ble_lbs_c[p_evt->conn_handle], p_evt);
}


/** @brief Database discovery initialization.
 */
static void db_discovery_init(void)
{
    ret_code_t err_code = ble_db_discovery_init(db_disc_handler);
    APP_ERROR_CHECK(err_code);
}



/** @brief Function to sleep until a BLE event is received by the application.
 */
static void power_manage(void)
{
    ret_code_t err_code = sd_app_evt_wait();
    APP_ERROR_CHECK(err_code);
}


void uart_init(void)
{
   
    app_uart_comm_params_t const comm_params =
    {
        .rx_pin_no    = RX_PIN_NUMBER,
        .tx_pin_no    = TX_PIN_NUMBER,
        .rts_pin_no   = RTS_PIN_NUMBER,
        .cts_pin_no   = CTS_PIN_NUMBER,
        .flow_control =  APP_UART_FLOW_CONTROL_DISABLED,
        .use_parity   = false,
#if defined (UART_PRESENT)
        .baud_rate    = NRF_UART_BAUDRATE_115200
#else
        .baud_rate    = NRF_UARTE_BAUDRATE_115200
#endif
    };
  
}


int main(void)
{
    ret_code_t err_code;

    err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);
    NRF_LOG_INFO(" Multilink Example\r\n");
	
    leds_init();
	  
    APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, NULL);

    buttons_init();
    ble_stack_init();
	  gap_params_init("multi_link_central");
	  db_discovery_init();
    lbs_c_init();
    uart_init();
	  conn_params_init();
	  services_init();
    // Start scanning for peripherals and initiate connection to devices which advertise.
    scan_start();
    // Turn on the LED to signal scanning.
    bsp_board_led_on(CENTRAL_SCANNING_LED);

    for (;;)
    {
        if (NRF_LOG_PROCESS() == false)
        {
            // Wait for BLE events.
            power_manage();
        }
    }
}