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How to send message from two slave to one master in nRF52

I hope to send a message from two slave to one master using nRF52 through bluetooth.

I send a message from a slave to a master with ble_app_uart_c and ble_app_uart. And I also connected two slave and one master with ble_app_multilink_central and peripheral. But I can't combine and apply that two case.

So please tell me how to send a message in multilink code, or how to use ble_app_uart as multilink.

I also found some information on internet, but I can't understand with them.

Parents
  • FormerMember
    0 FormerMember

    Yes,  on_ble_evt() is the same as ble_evt_handler(). 

    The steps above is based on SDK 12 or 13.

    From SDK 14.0.0, ble_evt_dispatch() was replaced by NRF_SDH_BLE_OBSERVER().

  • On the newest status, I've got 1 Error in Keil:

     error:  #167: argument of type "ble_nus_c_t (*)[8]" is incompatible with parameter of type "ble_nus_c_t *"

    The line is: ret_val = ble_nus_c_string_send(&m_ble_nus_c, data_array, index);

    Thats my code: 

    /**
     * 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_conn_state.h"
    #include "nrf_ble_gatt.h"
    #include "app_uart.h"
    #include "ble_nus_c.h"
    
    #define NRF_LOG_MODULE_NAME "APP"
    #include "nrf_log.h"
    #include "nrf_log_ctrl.h"
    
    
    #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 CONN_CFG_TAG              1                                             /**< A tag that refers to the BLE stack configuration we set with @ref sd_ble_cfg_set. Default tag is @ref BLE_CONN_CFG_TAG_DEFAULT. */
    
    #define CENTRAL_SCANNING_LED      BSP_BOARD_LED_0
    #define CENTRAL_CONNECTED_LED     BSP_BOARD_LED_1
    
    #define UART_TX_BUF_SIZE        256                                     /**< UART TX buffer size. */
    #define UART_RX_BUF_SIZE        256                                     /**< UART RX buffer size. */
    
    #define NUS_SERVICE_UUID_TYPE   BLE_UUID_TYPE_VENDOR_BEGIN              /**< UUID type for the Nordic UART Service (vendor specific). */
    
    
    #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 16 bit UUID */
    #define UUID32_SIZE             4                                       /**< Size of 32 bit UUID */
    #define UUID128_SIZE            16                                      /**< Size of 128 bit UUID */
    
    #define ECHOBACK_BLE_UART_DATA  1                                       /**< Echo the UART data that is received over the Nordic UART Service back to the sender. */
    
    #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)                           /**< Delay from a GPIOTE event until a button is reported as pushed (in number of timer ticks). */
    
    static ble_nus_c_t              m_ble_nus_c[TOTAL_LINK_COUNT];                            /**< Instance of NUS service. Must be passed to all NUS_C API calls. */
    static nrf_ble_gatt_t           m_gatt;                                 /**< GATT module instance. */
    static uint16_t                 m_ble_nus_max_data_len = BLE_GATT_ATT_MTU_DEFAULT - OPCODE_LENGTH - HANDLE_LENGTH; /**< Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic UART service module. */
    
    
    
    static char const m_target_periph_name[] = "Nordic_Blinky";                     /**< Name of the device we try to connect to. This name is searched for in the scan report data*/
    
    /** @brief Scan parameters requested for scanning and connection. */
    static ble_gap_scan_params_t const 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 ble_gap_conn_params_t const 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. */
    static nrf_ble_gatt_t     m_gatt;                                  /**< GATT module instance. */
    
    
    /**@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);
    }
    
    
    /**@brief Function for the LEDs initialization.
     *
     * @details Initializes all LEDs used by the application.
     */
    static void leds_init(void)
    {
        bsp_board_leds_init();
    }
    
    
    /**@brief NUS uuid. */
    static ble_uuid_t const m_nus_uuid =
    {
        .uuid = BLE_UUID_NUS_SERVICE,
        .type = NUS_SERVICE_UUID_TYPE
    };
    
    /**@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 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 for handling app_uart events.
     *
     * @details This function will receive a single character from the app_uart module and append it to
     *          a string. The string will be be sent over BLE when the last character received was a
     *          'new line' '\n' (hex 0x0A) or if the string has reached the maximum data length.
     */
    void uart_event_handle(app_uart_evt_t * p_event)
    {
        static uint8_t data_array[BLE_NUS_MAX_DATA_LEN];
        static uint16_t index = 0;
        uint32_t ret_val;
    
        switch (p_event->evt_type)
        {
            /**@snippet [Handling data from UART] */
            case APP_UART_DATA_READY:
                UNUSED_VARIABLE(app_uart_get(&data_array[index]));
                index++;
    
                if ((data_array[index - 1] == '\n') || (index >= (m_ble_nus_max_data_len)))
                {
                    NRF_LOG_DEBUG("Ready to send data over BLE NUS\r\n");
                    NRF_LOG_HEXDUMP_DEBUG(data_array, index);
    
                    do
                    {
                        ret_val = ble_nus_c_string_send(&m_ble_nus_c, data_array, index);
                        if ( (ret_val != NRF_ERROR_INVALID_STATE) && (ret_val != NRF_ERROR_BUSY) )
                        {
                            APP_ERROR_CHECK(ret_val);
                        }
                    } while (ret_val == NRF_ERROR_BUSY);
    
                    index = 0;
                }
                break;
    
            /**@snippet [Handling data from UART] */
            case APP_UART_COMMUNICATION_ERROR:
                NRF_LOG_ERROR("Communication error occurred while handling UART.\r\n");
                APP_ERROR_HANDLER(p_event->data.error_communication);
                break;
    
            case APP_UART_FIFO_ERROR:
                NRF_LOG_ERROR("Error occurred in FIFO module used by UART.\r\n");
                APP_ERROR_HANDLER(p_event->data.error_code);
                break;
    
            default:
                break;
        }
    }
    
    /**@snippet [Handling events from the ble_nus_c module] */
    static void ble_nus_c_evt_handler(ble_nus_c_t * p_ble_nus_c, const ble_nus_c_evt_t * p_ble_nus_evt)
    {
        ret_code_t err_code;
    
        switch (p_ble_nus_evt->evt_type)
        {
            case BLE_NUS_C_EVT_DISCOVERY_COMPLETE:
                NRF_LOG_INFO("Discovery complete.\r\n");
                err_code = ble_nus_c_handles_assign(p_ble_nus_c, p_ble_nus_evt->conn_handle, &p_ble_nus_evt->handles);
                APP_ERROR_CHECK(err_code);
    
                err_code = ble_nus_c_tx_notif_enable(p_ble_nus_c);
                APP_ERROR_CHECK(err_code);
                printf("Connected to device with Nordic UART Service.\r\n");
                break;
    
            case BLE_NUS_C_EVT_NUS_TX_EVT:
                ble_nus_chars_received_uart_print(p_ble_nus_evt->p_data, p_ble_nus_evt->data_len);
                break;
    
            case BLE_NUS_C_EVT_DISCONNECTED:
                NRF_LOG_INFO("Disconnected.\r\n");
                scan_start();
                break;
        }
    }
    
    
    
    
    
    /**@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(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.
        ble_gap_evt_t  const * p_gap_evt  = &p_ble_evt->evt.gap_evt;
        ble_gap_addr_t const * peer_addr  = &p_gap_evt->params.adv_report.peer_addr;
    
        // Prepare 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;
                }
            }
        }
    
        if (do_connect)
        {
            // Initiate connection.
            err_code = sd_ble_gap_connect(peer_addr,
                                          &m_scan_params, &m_connection_param,
                                          CONN_CFG_TAG);
            if (err_code != NRF_SUCCESS)
            {
                NRF_LOG_ERROR("Connection Request Failed, reason %d\r\n", err_code);
            }
        }
    }
    
    static bool is_uuid_present(ble_uuid_t               const * p_target_uuid,
                                ble_gap_evt_adv_report_t const * p_adv_report)
    {
        ret_code_t   err_code;
        ble_uuid_t   extracted_uuid;
        uint16_t     index  = 0;
        uint8_t    * p_data = (uint8_t *)p_adv_report->data;
    
        while (index < p_adv_report->dlen)
        {
            uint8_t field_length = p_data[index];
            uint8_t field_type   = p_data[index + 1];
    
            if (   (field_type == BLE_GAP_AD_TYPE_16BIT_SERVICE_UUID_MORE_AVAILABLE)
                || (field_type == BLE_GAP_AD_TYPE_16BIT_SERVICE_UUID_COMPLETE))
            {
                for (uint32_t i = 0; i < (field_length / UUID16_SIZE); i++)
                {
                    err_code = sd_ble_uuid_decode(UUID16_SIZE,
                                                  &p_data[i * UUID16_SIZE + index + 2],
                                                  &extracted_uuid);
    
                    if (err_code == NRF_SUCCESS)
                    {
                        if ((extracted_uuid.uuid == p_target_uuid->uuid)
                            && (extracted_uuid.type == p_target_uuid->type))
                        {
                            return true;
                        }
                    }
                }
            }
            else if (   (field_type == BLE_GAP_AD_TYPE_32BIT_SERVICE_UUID_MORE_AVAILABLE)
                     || (field_type == BLE_GAP_AD_TYPE_32BIT_SERVICE_UUID_COMPLETE))
            {
                for (uint32_t i = 0; i < (field_length / UUID32_SIZE); i++)
                {
                    err_code = sd_ble_uuid_decode(UUID32_SIZE,
                                                  &p_data[i * UUID32_SIZE + index + 2],
                                                  &extracted_uuid);
    
                    if (err_code == NRF_SUCCESS)
                    {
                        if (   (extracted_uuid.uuid == p_target_uuid->uuid)
                            && (extracted_uuid.type == p_target_uuid->type))
                        {
                            return true;
                        }
                    }
                }
            }
    
            else if (   (field_type == BLE_GAP_AD_TYPE_128BIT_SERVICE_UUID_MORE_AVAILABLE)
                     || (field_type == BLE_GAP_AD_TYPE_128BIT_SERVICE_UUID_COMPLETE))
            {
                err_code = sd_ble_uuid_decode(UUID128_SIZE, &p_data[index + 2], &extracted_uuid);
                if (err_code == NRF_SUCCESS)
                {
                    if (   (extracted_uuid.uuid == p_target_uuid->uuid)
                        && (extracted_uuid.type == p_target_uuid->type))
                    {
                        return true;
                    }
                }
            }
            index += field_length + 1;
        }
        return false;
    }
    
    /**@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(ble_evt_t const * p_ble_evt)
    {
        ret_code_t err_code;
    
        // For readability.
        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("Connected to target\r\n");
                err_code = ble_nus_c_handles_assign(m_ble_nus_c, p_ble_evt->evt.gap_evt.conn_handle, NULL);
                APP_ERROR_CHECK(err_code);
    
                err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
                APP_ERROR_CHECK(err_code);
    
                // start discovery of services. The NUS Client waits for a discovery result
                err_code = ble_db_discovery_start(m_ble_db_discovery, p_ble_evt->evt.gap_evt.conn_handle);
                APP_ERROR_CHECK(err_code);
    					
                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);
    
                memset(&m_ble_db_discovery[p_gap_evt->conn_handle], 0x00, sizeof(ble_db_discovery_t));
                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:
            {
                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);
    
                if (ble_conn_state_n_centrals() == 0)
                {
                    err_code = app_button_disable();
                    APP_ERROR_CHECK(err_code);
    
                    // Turn off connection indication LED
                    bsp_board_led_off(CENTRAL_CONNECTED_LED);
                }
    
                // Start scanning
                scan_start();
    
                // Turn on LED for indicating scanning
                bsp_board_led_on(CENTRAL_SCANNING_LED);
    
            } break;
    
            case BLE_GAP_EVT_ADV_REPORT:
                on_adv_report(p_ble_evt);
    				
    				const ble_gap_evt_adv_report_t * p_adv_report = &p_gap_evt->params.adv_report;
    
                if (is_uuid_present(&m_nus_uuid, p_adv_report))
                {
    
                    err_code = sd_ble_gap_connect(&p_adv_report->peer_addr,
                                                  &m_scan_params,
                                                  &m_connection_param,
                                                  CONN_CFG_TAG);
    
                    if (err_code == NRF_SUCCESS)
                    {
                        // scan is automatically stopped by the connect
                        err_code = bsp_indication_set(BSP_INDICATE_IDLE);
                        APP_ERROR_CHECK(err_code);
                        NRF_LOG_INFO("Connecting to target %02x%02x%02x%02x%02x%02x\r\n",
                                 p_adv_report->peer_addr.addr[0],
                                 p_adv_report->peer_addr.addr[1],
                                 p_adv_report->peer_addr.addr[2],
                                 p_adv_report->peer_addr.addr[3],
                                 p_adv_report->peer_addr.addr[4],
                                 p_adv_report->peer_addr.addr[5]
                                 );
                    }
                }
                break;
    
            case BLE_GAP_EVT_TIMEOUT:
            {
                if (p_gap_evt->params.timeout.src == BLE_GAP_TIMEOUT_SRC_SCAN)
                {
                    NRF_LOG_INFO("Scan timed out.\r\n");
                    scan_start();
                }
                else if (p_gap_evt->params.timeout.src == BLE_GAP_TIMEOUT_SRC_CONN)
                {
                    NRF_LOG_INFO("Connection Request timed out.\r\n");
                }
            } break;
    
            case BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST:
            {
                NRF_LOG_DEBUG("BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST.\r\n");
                // 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_GAP_EVT_SEC_PARAMS_REQUEST:
                // Pairing not supported
                err_code = sd_ble_gap_sec_params_reply(p_ble_evt->evt.gap_evt.conn_handle, BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP, NULL, NULL);
                APP_ERROR_CHECK(err_code);
                break; // BLE_GAP_EVT_SEC_PARAMS_REQUEST
    				
            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;
    
            default:
                // No implementation needed.
                break;
        }
    }
    
    
    /**@brief Function for dispatching a BLE stack event to all modules with a BLE stack event handler.
     *
     * @details This function is called from the 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);
        }
    
        nrf_ble_gatt_on_ble_evt(&m_gatt, p_ble_evt);
    		ble_nus_c_on_ble_evt(m_ble_nus_c,p_ble_evt);
    }
    
    
    
    /**@brief LED Button collector initialization.
     */
    static void lbs_c_init(void)
    {
        ret_code_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;
    }
    
    
    /**@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);
    
        // Fetch the start address of the application RAM.
        uint32_t ram_start = 0;
        err_code = softdevice_app_ram_start_get(&ram_start);
        APP_ERROR_CHECK(err_code);
    
        // Overwrite some of the default configurations for the BLE stack.
        ble_cfg_t ble_cfg;
    
        // Configure the maximum number of connections.
        memset(&ble_cfg, 0, sizeof(ble_cfg));
        ble_cfg.gap_cfg.role_count_cfg.periph_role_count  = PERIPHERAL_LINK_COUNT;
        ble_cfg.gap_cfg.role_count_cfg.central_role_count = CENTRAL_LINK_COUNT;
        ble_cfg.gap_cfg.role_count_cfg.central_sec_count  = 1;
        err_code = sd_ble_cfg_set(BLE_GAP_CFG_ROLE_COUNT, &ble_cfg, ram_start);
        APP_ERROR_CHECK(err_code);
    
        memset(&ble_cfg, 0, sizeof(ble_cfg));
        ble_cfg.conn_cfg.params.gap_conn_cfg.conn_count     = PERIPHERAL_LINK_COUNT + CENTRAL_LINK_COUNT;
        ble_cfg.conn_cfg.params.gap_conn_cfg.event_length   = BLE_GAP_EVENT_LENGTH_DEFAULT;
        ble_cfg.conn_cfg.conn_cfg_tag                       = CONN_CFG_TAG;
        err_code = sd_ble_cfg_set(BLE_CONN_CFG_GAP, &ble_cfg, ram_start);
        APP_ERROR_CHECK(err_code);
    
        // Enable BLE stack.
        err_code = softdevice_enable(&ram_start);
        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 for writing to the LED characteristic of all connected clients.
     *
     * @details Based on if the button is pressed or released, this function writes 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 If successful NRF_SUCCESS is returned. Otherwise, the error code from @ref ble_lbs_led_status_send.
     */
    static ret_code_t led_status_send_to_all(uint8_t button_action)
    {
        ret_code_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)
    {
        ret_code_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)
    {
        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_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_DEBUG("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);
    }
    
    
    /** @brief Function for initializing the log module.
     */
    static void log_init(void)
    {
        ret_code_t err_code = NRF_LOG_INIT(NULL);
        APP_ERROR_CHECK(err_code);
    }
    
    
    /** @brief Function for initializing the timer.
     */
    static void timer_init(void)
    {
        ret_code_t err_code = app_timer_init();
        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 initializing the NUS Client. */
    static void nus_c_init(void)
    {
        ret_code_t       err_code;
        ble_nus_c_init_t init;
    
        init.evt_handler = ble_nus_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_nus_c_init(&m_ble_nus_c[m_ble_lbs_c_count], &init);
            APP_ERROR_CHECK(err_code);
        }
        m_ble_lbs_c_count = 0;
    }
    
    /**@brief Function for initializing the UART. */
    static void uart_init(void)
    {
        ret_code_t err_code;
    
        const app_uart_comm_params_t 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,
            .baud_rate    = UART_BAUDRATE_BAUDRATE_Baud115200
          };
    
        APP_UART_FIFO_INIT(&comm_params,
                           UART_RX_BUF_SIZE,
                           UART_TX_BUF_SIZE,
                           uart_event_handle,
                           APP_IRQ_PRIORITY_LOWEST,
                           err_code);
    
        APP_ERROR_CHECK(err_code);
    }
    
    int main(void)
    {
        log_init();
    		uart_init();
        timer_init();
        leds_init();
        buttons_init();
        ble_stack_init();
        gatt_init();
        db_discovery_init();
        //lbs_c_init();
        ble_conn_state_init();
    		nus_c_init();
    	
        NRF_LOG_INFO("Multilink example started.\r\n");
    
        // 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 don't understand this error 100%, is it because it can't match the pointers? 

    Thanks for your help :)

Reply
  • On the newest status, I've got 1 Error in Keil:

     error:  #167: argument of type "ble_nus_c_t (*)[8]" is incompatible with parameter of type "ble_nus_c_t *"

    The line is: ret_val = ble_nus_c_string_send(&m_ble_nus_c, data_array, index);

    Thats my code: 

    /**
     * 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_conn_state.h"
    #include "nrf_ble_gatt.h"
    #include "app_uart.h"
    #include "ble_nus_c.h"
    
    #define NRF_LOG_MODULE_NAME "APP"
    #include "nrf_log.h"
    #include "nrf_log_ctrl.h"
    
    
    #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 CONN_CFG_TAG              1                                             /**< A tag that refers to the BLE stack configuration we set with @ref sd_ble_cfg_set. Default tag is @ref BLE_CONN_CFG_TAG_DEFAULT. */
    
    #define CENTRAL_SCANNING_LED      BSP_BOARD_LED_0
    #define CENTRAL_CONNECTED_LED     BSP_BOARD_LED_1
    
    #define UART_TX_BUF_SIZE        256                                     /**< UART TX buffer size. */
    #define UART_RX_BUF_SIZE        256                                     /**< UART RX buffer size. */
    
    #define NUS_SERVICE_UUID_TYPE   BLE_UUID_TYPE_VENDOR_BEGIN              /**< UUID type for the Nordic UART Service (vendor specific). */
    
    
    #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 16 bit UUID */
    #define UUID32_SIZE             4                                       /**< Size of 32 bit UUID */
    #define UUID128_SIZE            16                                      /**< Size of 128 bit UUID */
    
    #define ECHOBACK_BLE_UART_DATA  1                                       /**< Echo the UART data that is received over the Nordic UART Service back to the sender. */
    
    #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)                           /**< Delay from a GPIOTE event until a button is reported as pushed (in number of timer ticks). */
    
    static ble_nus_c_t              m_ble_nus_c[TOTAL_LINK_COUNT];                            /**< Instance of NUS service. Must be passed to all NUS_C API calls. */
    static nrf_ble_gatt_t           m_gatt;                                 /**< GATT module instance. */
    static uint16_t                 m_ble_nus_max_data_len = BLE_GATT_ATT_MTU_DEFAULT - OPCODE_LENGTH - HANDLE_LENGTH; /**< Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic UART service module. */
    
    
    
    static char const m_target_periph_name[] = "Nordic_Blinky";                     /**< Name of the device we try to connect to. This name is searched for in the scan report data*/
    
    /** @brief Scan parameters requested for scanning and connection. */
    static ble_gap_scan_params_t const 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 ble_gap_conn_params_t const 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. */
    static nrf_ble_gatt_t     m_gatt;                                  /**< GATT module instance. */
    
    
    /**@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);
    }
    
    
    /**@brief Function for the LEDs initialization.
     *
     * @details Initializes all LEDs used by the application.
     */
    static void leds_init(void)
    {
        bsp_board_leds_init();
    }
    
    
    /**@brief NUS uuid. */
    static ble_uuid_t const m_nus_uuid =
    {
        .uuid = BLE_UUID_NUS_SERVICE,
        .type = NUS_SERVICE_UUID_TYPE
    };
    
    /**@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 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 for handling app_uart events.
     *
     * @details This function will receive a single character from the app_uart module and append it to
     *          a string. The string will be be sent over BLE when the last character received was a
     *          'new line' '\n' (hex 0x0A) or if the string has reached the maximum data length.
     */
    void uart_event_handle(app_uart_evt_t * p_event)
    {
        static uint8_t data_array[BLE_NUS_MAX_DATA_LEN];
        static uint16_t index = 0;
        uint32_t ret_val;
    
        switch (p_event->evt_type)
        {
            /**@snippet [Handling data from UART] */
            case APP_UART_DATA_READY:
                UNUSED_VARIABLE(app_uart_get(&data_array[index]));
                index++;
    
                if ((data_array[index - 1] == '\n') || (index >= (m_ble_nus_max_data_len)))
                {
                    NRF_LOG_DEBUG("Ready to send data over BLE NUS\r\n");
                    NRF_LOG_HEXDUMP_DEBUG(data_array, index);
    
                    do
                    {
                        ret_val = ble_nus_c_string_send(&m_ble_nus_c, data_array, index);
                        if ( (ret_val != NRF_ERROR_INVALID_STATE) && (ret_val != NRF_ERROR_BUSY) )
                        {
                            APP_ERROR_CHECK(ret_val);
                        }
                    } while (ret_val == NRF_ERROR_BUSY);
    
                    index = 0;
                }
                break;
    
            /**@snippet [Handling data from UART] */
            case APP_UART_COMMUNICATION_ERROR:
                NRF_LOG_ERROR("Communication error occurred while handling UART.\r\n");
                APP_ERROR_HANDLER(p_event->data.error_communication);
                break;
    
            case APP_UART_FIFO_ERROR:
                NRF_LOG_ERROR("Error occurred in FIFO module used by UART.\r\n");
                APP_ERROR_HANDLER(p_event->data.error_code);
                break;
    
            default:
                break;
        }
    }
    
    /**@snippet [Handling events from the ble_nus_c module] */
    static void ble_nus_c_evt_handler(ble_nus_c_t * p_ble_nus_c, const ble_nus_c_evt_t * p_ble_nus_evt)
    {
        ret_code_t err_code;
    
        switch (p_ble_nus_evt->evt_type)
        {
            case BLE_NUS_C_EVT_DISCOVERY_COMPLETE:
                NRF_LOG_INFO("Discovery complete.\r\n");
                err_code = ble_nus_c_handles_assign(p_ble_nus_c, p_ble_nus_evt->conn_handle, &p_ble_nus_evt->handles);
                APP_ERROR_CHECK(err_code);
    
                err_code = ble_nus_c_tx_notif_enable(p_ble_nus_c);
                APP_ERROR_CHECK(err_code);
                printf("Connected to device with Nordic UART Service.\r\n");
                break;
    
            case BLE_NUS_C_EVT_NUS_TX_EVT:
                ble_nus_chars_received_uart_print(p_ble_nus_evt->p_data, p_ble_nus_evt->data_len);
                break;
    
            case BLE_NUS_C_EVT_DISCONNECTED:
                NRF_LOG_INFO("Disconnected.\r\n");
                scan_start();
                break;
        }
    }
    
    
    
    
    
    /**@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(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.
        ble_gap_evt_t  const * p_gap_evt  = &p_ble_evt->evt.gap_evt;
        ble_gap_addr_t const * peer_addr  = &p_gap_evt->params.adv_report.peer_addr;
    
        // Prepare 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;
                }
            }
        }
    
        if (do_connect)
        {
            // Initiate connection.
            err_code = sd_ble_gap_connect(peer_addr,
                                          &m_scan_params, &m_connection_param,
                                          CONN_CFG_TAG);
            if (err_code != NRF_SUCCESS)
            {
                NRF_LOG_ERROR("Connection Request Failed, reason %d\r\n", err_code);
            }
        }
    }
    
    static bool is_uuid_present(ble_uuid_t               const * p_target_uuid,
                                ble_gap_evt_adv_report_t const * p_adv_report)
    {
        ret_code_t   err_code;
        ble_uuid_t   extracted_uuid;
        uint16_t     index  = 0;
        uint8_t    * p_data = (uint8_t *)p_adv_report->data;
    
        while (index < p_adv_report->dlen)
        {
            uint8_t field_length = p_data[index];
            uint8_t field_type   = p_data[index + 1];
    
            if (   (field_type == BLE_GAP_AD_TYPE_16BIT_SERVICE_UUID_MORE_AVAILABLE)
                || (field_type == BLE_GAP_AD_TYPE_16BIT_SERVICE_UUID_COMPLETE))
            {
                for (uint32_t i = 0; i < (field_length / UUID16_SIZE); i++)
                {
                    err_code = sd_ble_uuid_decode(UUID16_SIZE,
                                                  &p_data[i * UUID16_SIZE + index + 2],
                                                  &extracted_uuid);
    
                    if (err_code == NRF_SUCCESS)
                    {
                        if ((extracted_uuid.uuid == p_target_uuid->uuid)
                            && (extracted_uuid.type == p_target_uuid->type))
                        {
                            return true;
                        }
                    }
                }
            }
            else if (   (field_type == BLE_GAP_AD_TYPE_32BIT_SERVICE_UUID_MORE_AVAILABLE)
                     || (field_type == BLE_GAP_AD_TYPE_32BIT_SERVICE_UUID_COMPLETE))
            {
                for (uint32_t i = 0; i < (field_length / UUID32_SIZE); i++)
                {
                    err_code = sd_ble_uuid_decode(UUID32_SIZE,
                                                  &p_data[i * UUID32_SIZE + index + 2],
                                                  &extracted_uuid);
    
                    if (err_code == NRF_SUCCESS)
                    {
                        if (   (extracted_uuid.uuid == p_target_uuid->uuid)
                            && (extracted_uuid.type == p_target_uuid->type))
                        {
                            return true;
                        }
                    }
                }
            }
    
            else if (   (field_type == BLE_GAP_AD_TYPE_128BIT_SERVICE_UUID_MORE_AVAILABLE)
                     || (field_type == BLE_GAP_AD_TYPE_128BIT_SERVICE_UUID_COMPLETE))
            {
                err_code = sd_ble_uuid_decode(UUID128_SIZE, &p_data[index + 2], &extracted_uuid);
                if (err_code == NRF_SUCCESS)
                {
                    if (   (extracted_uuid.uuid == p_target_uuid->uuid)
                        && (extracted_uuid.type == p_target_uuid->type))
                    {
                        return true;
                    }
                }
            }
            index += field_length + 1;
        }
        return false;
    }
    
    /**@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(ble_evt_t const * p_ble_evt)
    {
        ret_code_t err_code;
    
        // For readability.
        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("Connected to target\r\n");
                err_code = ble_nus_c_handles_assign(m_ble_nus_c, p_ble_evt->evt.gap_evt.conn_handle, NULL);
                APP_ERROR_CHECK(err_code);
    
                err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
                APP_ERROR_CHECK(err_code);
    
                // start discovery of services. The NUS Client waits for a discovery result
                err_code = ble_db_discovery_start(m_ble_db_discovery, p_ble_evt->evt.gap_evt.conn_handle);
                APP_ERROR_CHECK(err_code);
    					
                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);
    
                memset(&m_ble_db_discovery[p_gap_evt->conn_handle], 0x00, sizeof(ble_db_discovery_t));
                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:
            {
                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);
    
                if (ble_conn_state_n_centrals() == 0)
                {
                    err_code = app_button_disable();
                    APP_ERROR_CHECK(err_code);
    
                    // Turn off connection indication LED
                    bsp_board_led_off(CENTRAL_CONNECTED_LED);
                }
    
                // Start scanning
                scan_start();
    
                // Turn on LED for indicating scanning
                bsp_board_led_on(CENTRAL_SCANNING_LED);
    
            } break;
    
            case BLE_GAP_EVT_ADV_REPORT:
                on_adv_report(p_ble_evt);
    				
    				const ble_gap_evt_adv_report_t * p_adv_report = &p_gap_evt->params.adv_report;
    
                if (is_uuid_present(&m_nus_uuid, p_adv_report))
                {
    
                    err_code = sd_ble_gap_connect(&p_adv_report->peer_addr,
                                                  &m_scan_params,
                                                  &m_connection_param,
                                                  CONN_CFG_TAG);
    
                    if (err_code == NRF_SUCCESS)
                    {
                        // scan is automatically stopped by the connect
                        err_code = bsp_indication_set(BSP_INDICATE_IDLE);
                        APP_ERROR_CHECK(err_code);
                        NRF_LOG_INFO("Connecting to target %02x%02x%02x%02x%02x%02x\r\n",
                                 p_adv_report->peer_addr.addr[0],
                                 p_adv_report->peer_addr.addr[1],
                                 p_adv_report->peer_addr.addr[2],
                                 p_adv_report->peer_addr.addr[3],
                                 p_adv_report->peer_addr.addr[4],
                                 p_adv_report->peer_addr.addr[5]
                                 );
                    }
                }
                break;
    
            case BLE_GAP_EVT_TIMEOUT:
            {
                if (p_gap_evt->params.timeout.src == BLE_GAP_TIMEOUT_SRC_SCAN)
                {
                    NRF_LOG_INFO("Scan timed out.\r\n");
                    scan_start();
                }
                else if (p_gap_evt->params.timeout.src == BLE_GAP_TIMEOUT_SRC_CONN)
                {
                    NRF_LOG_INFO("Connection Request timed out.\r\n");
                }
            } break;
    
            case BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST:
            {
                NRF_LOG_DEBUG("BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST.\r\n");
                // 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_GAP_EVT_SEC_PARAMS_REQUEST:
                // Pairing not supported
                err_code = sd_ble_gap_sec_params_reply(p_ble_evt->evt.gap_evt.conn_handle, BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP, NULL, NULL);
                APP_ERROR_CHECK(err_code);
                break; // BLE_GAP_EVT_SEC_PARAMS_REQUEST
    				
            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;
    
            default:
                // No implementation needed.
                break;
        }
    }
    
    
    /**@brief Function for dispatching a BLE stack event to all modules with a BLE stack event handler.
     *
     * @details This function is called from the 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);
        }
    
        nrf_ble_gatt_on_ble_evt(&m_gatt, p_ble_evt);
    		ble_nus_c_on_ble_evt(m_ble_nus_c,p_ble_evt);
    }
    
    
    
    /**@brief LED Button collector initialization.
     */
    static void lbs_c_init(void)
    {
        ret_code_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;
    }
    
    
    /**@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);
    
        // Fetch the start address of the application RAM.
        uint32_t ram_start = 0;
        err_code = softdevice_app_ram_start_get(&ram_start);
        APP_ERROR_CHECK(err_code);
    
        // Overwrite some of the default configurations for the BLE stack.
        ble_cfg_t ble_cfg;
    
        // Configure the maximum number of connections.
        memset(&ble_cfg, 0, sizeof(ble_cfg));
        ble_cfg.gap_cfg.role_count_cfg.periph_role_count  = PERIPHERAL_LINK_COUNT;
        ble_cfg.gap_cfg.role_count_cfg.central_role_count = CENTRAL_LINK_COUNT;
        ble_cfg.gap_cfg.role_count_cfg.central_sec_count  = 1;
        err_code = sd_ble_cfg_set(BLE_GAP_CFG_ROLE_COUNT, &ble_cfg, ram_start);
        APP_ERROR_CHECK(err_code);
    
        memset(&ble_cfg, 0, sizeof(ble_cfg));
        ble_cfg.conn_cfg.params.gap_conn_cfg.conn_count     = PERIPHERAL_LINK_COUNT + CENTRAL_LINK_COUNT;
        ble_cfg.conn_cfg.params.gap_conn_cfg.event_length   = BLE_GAP_EVENT_LENGTH_DEFAULT;
        ble_cfg.conn_cfg.conn_cfg_tag                       = CONN_CFG_TAG;
        err_code = sd_ble_cfg_set(BLE_CONN_CFG_GAP, &ble_cfg, ram_start);
        APP_ERROR_CHECK(err_code);
    
        // Enable BLE stack.
        err_code = softdevice_enable(&ram_start);
        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 for writing to the LED characteristic of all connected clients.
     *
     * @details Based on if the button is pressed or released, this function writes 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 If successful NRF_SUCCESS is returned. Otherwise, the error code from @ref ble_lbs_led_status_send.
     */
    static ret_code_t led_status_send_to_all(uint8_t button_action)
    {
        ret_code_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)
    {
        ret_code_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)
    {
        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_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_DEBUG("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);
    }
    
    
    /** @brief Function for initializing the log module.
     */
    static void log_init(void)
    {
        ret_code_t err_code = NRF_LOG_INIT(NULL);
        APP_ERROR_CHECK(err_code);
    }
    
    
    /** @brief Function for initializing the timer.
     */
    static void timer_init(void)
    {
        ret_code_t err_code = app_timer_init();
        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 initializing the NUS Client. */
    static void nus_c_init(void)
    {
        ret_code_t       err_code;
        ble_nus_c_init_t init;
    
        init.evt_handler = ble_nus_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_nus_c_init(&m_ble_nus_c[m_ble_lbs_c_count], &init);
            APP_ERROR_CHECK(err_code);
        }
        m_ble_lbs_c_count = 0;
    }
    
    /**@brief Function for initializing the UART. */
    static void uart_init(void)
    {
        ret_code_t err_code;
    
        const app_uart_comm_params_t 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,
            .baud_rate    = UART_BAUDRATE_BAUDRATE_Baud115200
          };
    
        APP_UART_FIFO_INIT(&comm_params,
                           UART_RX_BUF_SIZE,
                           UART_TX_BUF_SIZE,
                           uart_event_handle,
                           APP_IRQ_PRIORITY_LOWEST,
                           err_code);
    
        APP_ERROR_CHECK(err_code);
    }
    
    int main(void)
    {
        log_init();
    		uart_init();
        timer_init();
        leds_init();
        buttons_init();
        ble_stack_init();
        gatt_init();
        db_discovery_init();
        //lbs_c_init();
        ble_conn_state_init();
    		nus_c_init();
    	
        NRF_LOG_INFO("Multilink example started.\r\n");
    
        // 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 don't understand this error 100%, is it because it can't match the pointers? 

    Thanks for your help :)

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