cannot read (in central) the 2nd custom characteristic value defined within a custom service (of a peripheral)

Dear Nordic Experts,

Hello,

i have defined a custom service containing a custom char. value in a peripheral according to https://github.com/NordicPlayground/nRF5x-custom-ble-service-tutorial . i edited the code so that i define two char. values within the same custom service (with separate char. value UUIDs). i connect to the peripheral through nrf-connect on my phone and edit the values of both char. values. in a central device i can successfully read the first char. value, but do not manage reading the second, trying various codes and tricks. 

i attach my code for the central.

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 */
/**
 * @brief BLE LED Button Service central and client application main file.
 *
 * This file contains the source code for a sample client application using the LED Button service.
 */

#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "nrf_sdh.h"
#include "nrf_sdh_ble.h"
#include "nrf_sdh_soc.h"
#include "nrf_pwr_mgmt.h"
#include "app_timer.h"
#include "boards.h"
#include "bsp.h"
#include "bsp_btn_ble.h"
#include "ble.h"
#include "ble_hci.h"
#include "ble_advertising.h"
#include "ble_conn_params.h"
#include "ble_db_discovery.h"
#include "ble_lbs_c.h"
#include "nrf_ble_gatt.h"
#include "nrf_ble_scan.h"

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

#include "nrf_gpio.h"
//#include "app_uart.c"
#include "app_error.h"
#include "app_uart.h"
#include "nrf_delay.h"
#include "nrf_uart.h"

#include "fds.h"
#include "nrf_fstorage.h"

//#include "app_fifo.h"
#define UART_TX_BUF_SIZE        256                                     /**< UART TX buffer size. */
#define UART_RX_BUF_SIZE        256 


#define CENTRAL_SCANNING_LED            BSP_BOARD_LED_0                     /**< Scanning LED will be on when the device is scanning. */
#define CENTRAL_CONNECTED_LED           BSP_BOARD_LED_1                     /**< Connected LED will be on when the device is connected. */
#define LEDBUTTON_LED                   BSP_BOARD_LED_2                     /**< LED to indicate a change of state of the the Button characteristic on the peer. */

#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_DURATION                   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 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). */

#define APP_BLE_CONN_CFG_TAG            1                                   /**< A tag identifying the SoftDevice BLE configuration. */
#define APP_BLE_OBSERVER_PRIO           3                                   /**< Application's BLE observer priority. You shouldn't need to modify this value. */

#define TARGET_UUID  0x180D
#define CUSTOM_PIN 17 

#define FILE_ID    0x1111
#define REC_KEY    0x2222


NRF_BLE_SCAN_DEF(m_scan);                                       /**< Scanning module instance. */
BLE_LBS_C_DEF(m_ble_lbs_c);                                     /**< Main structure used by the LBS client module. */
NRF_BLE_GATT_DEF(m_gatt);                                       /**< GATT module instance. */
BLE_DB_DISCOVERY_DEF(m_db_disc);                                /**< DB discovery module instance. */
NRF_BLE_GQ_DEF(m_ble_gatt_queue,                                /**< BLE GATT Queue instance. */
               NRF_SDH_BLE_CENTRAL_LINK_COUNT,
               NRF_BLE_GQ_QUEUE_SIZE);

static ble_gap_scan_params_t m_scan_param = {
    .active        = 1,                     // To receive scan response
    .interval      = NRF_BLE_SCAN_SCAN_INTERVAL,
    .window        = NRF_BLE_SCAN_SCAN_WINDOW,
    .timeout       = 0,                     // Scanning forever unless you stop manually
    .scan_phys     = BLE_GAP_PHY_1MBPS,
    .filter_policy = BLE_GAP_SCAN_FP_ACCEPT_ALL,
};

#define CUSTOM_SERVICE_UUID_BASE         {0xBC, 0x8A, 0xBF, 0x45, 0xCA, 0x05, 0x50, 0xBA, \
                                          0x40, 0x42, 0xB0, 0x00, 0xC9, 0xAD, 0x64, 0xF3}

#define CUSTOM_SERVICE_UUID               0x1400
#define CUSTOM_VALUE_CHAR_UUID            0x1401
#define CUSTOM_VALUE_CHAR_UUID2            0x1402

static uint16_t          m_conn_handle       = BLE_CONN_HANDLE_INVALID;
static ble_uuid_t        m_custom_uuid;
static ble_gattc_handle_range_t m_service_handle_range;
static ble_gattc_handle_range_t m_service_handle_range2;

static uint16_t          m_custom_char_handle = BLE_GATT_HANDLE_INVALID;
static uint16_t          m_custom_char2_handle = BLE_GATT_HANDLE_INVALID;

bool charnum =0;



static char srvr_id[20]; 
static uint16_t srvr_id_len = 0;

/**@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);
}

static void save_message(uint8_t * data, uint16_t length)
{
    static fds_record_t        record;
    static fds_record_desc_t   record_desc;

    // Convert length from bytes to words (FDS stores in 4-byte words)
    uint32_t length_words = (length + 3) / 4;

    record.file_id              = FILE_ID;
    record.key                  = REC_KEY;
    record.data.p_data          = data;
    record.data.length_words    = length_words;

    ret_code_t err_code = fds_record_write(&record_desc, &record);
    APP_ERROR_CHECK(err_code);
}

void uart_send(const char * msg)
{
        for (int i = 0; msg[i] != '\0'; i++)
        {
            while (app_uart_put(msg[i]) != NRF_SUCCESS);
        }

        uint8_t dummy;
        while (app_uart_get(&dummy) == NRF_SUCCESS) {
            // Keep reading until the buffer is empty
        }

}

static void load_message(void)
{
    fds_record_desc_t desc = {0};
    fds_find_token_t  tok  = {0};

    // Search for the record
    if (fds_record_find(FILE_ID, REC_KEY, &desc, &tok) == NRF_SUCCESS)
    {
        fds_flash_record_t flash_record = {0};

        // Open the record
        if (fds_record_open(&desc, &flash_record) == NRF_SUCCESS)
        {
            // Access the data
            //char *saved_data = (char *)flash_record.p_data;
            //srvr_id_len  = flash_record.p_header->length_words * 4; // in bytes

            memcpy(srvr_id, (char *)flash_record.p_data, srvr_id_len);
            uart_send("message loaded");
            nrf_delay_ms(100);
            uart_send(srvr_id);

            // Print or use it
            NRF_LOG_INFO("Recovered message: %s", (uint32_t)srvr_id);

            // Close the record
            fds_record_close(&desc);
        }
    }
    else
    {
        NRF_LOG_INFO("No saved message found.");
    }
}


static void fds_evt_handler(fds_evt_t const * const p_evt)
{
    switch (p_evt->id)
    {
        case FDS_EVT_INIT:
            if (p_evt->result == NRF_SUCCESS)
            {
                NRF_LOG_INFO("FDS initialized.");
            }
            else
            {
                NRF_LOG_ERROR("FDS init failed (0x%x).", p_evt->result);
            }
            break;

        case FDS_EVT_WRITE:
            if (p_evt->result == NRF_SUCCESS)
            {
                NRF_LOG_INFO("Record written successfully.");
            }
            else
            {
                NRF_LOG_ERROR("Write failed (0x%x).", p_evt->result);
            }
            break;

        case FDS_EVT_UPDATE:
            if (p_evt->result == NRF_SUCCESS)
            {
                NRF_LOG_INFO("Record updated successfully.");
            }
            break;

        case FDS_EVT_DEL_RECORD:
            NRF_LOG_INFO("Record deleted.");
            break;

        case FDS_EVT_GC:
            NRF_LOG_INFO("Garbage collection complete.");
            break;

        default:
            break;
    }
}


static void fds_init_helper(void)
{
    ret_code_t err_code = fds_register(fds_evt_handler);
    APP_ERROR_CHECK(err_code);

    err_code = fds_init();
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling the LED Button Service client errors.
 *
 * @param[in]   nrf_error   Error code containing information about what went wrong.
 */
static void lbs_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}


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


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

    err_code = nrf_ble_scan_start(&m_scan);
    APP_ERROR_CHECK(err_code);

    bsp_board_led_off(CENTRAL_CONNECTED_LED);
    bsp_board_led_on(CENTRAL_SCANNING_LED);
}


/**@brief Handles events coming from the LED Button central module.
 */
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;

            err_code = ble_lbs_c_handles_assign(&m_ble_lbs_c,
                                                p_lbs_c_evt->conn_handle,
                                                &p_lbs_c_evt->params.peer_db);
            NRF_LOG_INFO("LED Button service discovered on conn_handle 0x%x.", 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("Button state changed on peer to 0x%x.", 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 BLE events.
 *
 * @param[in]   p_ble_evt   Bluetooth stack event.
 * @param[in]   p_context   Unused.
 */

 static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
    ret_code_t err_code;
   
    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            NRF_LOG_INFO("Connected");
            m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;

            // Discover primary service
            err_code = sd_ble_gattc_primary_services_discover(
                m_conn_handle, 1, &m_custom_uuid);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_GAP_EVT_DISCONNECTED:
            NRF_LOG_INFO("Disconnected");
            m_conn_handle = BLE_CONN_HANDLE_INVALID;
            break;

        case BLE_GATTC_EVT_PRIM_SRVC_DISC_RSP:
        {
            const ble_gattc_evt_prim_srvc_disc_rsp_t * p_rsp =
                &p_ble_evt->evt.gattc_evt.params.prim_srvc_disc_rsp;

            if (p_rsp->count > 0)
            {
                m_service_handle_range = p_rsp->services[0].handle_range;
                


                // Discover characteristic in this service
                err_code = sd_ble_gattc_characteristics_discover(
                    m_conn_handle, &m_service_handle_range);
                APP_ERROR_CHECK(err_code);


            }
            else
            {
                NRF_LOG_WARNING("Service not found");
            }
        } break;

        case BLE_GATTC_EVT_CHAR_DISC_RSP:
        {
            const ble_gattc_evt_char_disc_rsp_t * p_rsp =
                &p_ble_evt->evt.gattc_evt.params.char_disc_rsp;
            char cip_cmd[32];
            snprintf(cip_cmd, sizeof(cip_cmd), "p_rsp->count=%d\r\n",p_rsp->count );
            uart_send(cip_cmd);
            nrf_delay_ms(100);

                

            for (uint8_t i = 0; i < p_rsp->count; i++)
            {
                if (p_rsp->chars[i].uuid.uuid == CUSTOM_VALUE_CHAR_UUID)
                {
                    m_custom_char_handle = p_rsp->chars[i].handle_value;
                    NRF_LOG_INFO("Custom characteristic handle: %d", m_custom_char_handle);
                }
                else if (p_rsp->chars[i].uuid.uuid == CUSTOM_VALUE_CHAR_UUID2)
                {
                    m_custom_char2_handle = p_rsp->chars[i].handle_value;
                    uart_send("orega!");
                }

                 if (m_custom_char_handle != BLE_GATT_HANDLE_INVALID)
                {
                   // Read characteristic
                    err_code = sd_ble_gattc_read(m_conn_handle, m_custom_char_handle, 0);
                    APP_ERROR_CHECK(err_code);}

                if (m_custom_char2_handle != BLE_GATT_HANDLE_INVALID)
                {
                   // Read characteristic
                    err_code = sd_ble_gattc_read(m_conn_handle, m_custom_char2_handle, 0);
                    APP_ERROR_CHECK(err_code);}

                  
            }
        } break;

        case BLE_GATTC_EVT_READ_RSP:
        {
            const ble_gattc_evt_read_rsp_t * p_rsp =
                &p_ble_evt->evt.gattc_evt.params.read_rsp;

            NRF_LOG_INFO("Read %d bytes", p_rsp->len);
            NRF_LOG_HEXDUMP_INFO(p_rsp->data, p_rsp->len);
            // uart_send((const char *) p_rsp->data);
             //srvr_id=(const char)*(p_rsp->data);
            srvr_id_len = p_rsp->len;
            memcpy(srvr_id, p_rsp->data, srvr_id_len);
            srvr_id[srvr_id_len] = '\0';  // null-terminate if it's a string
            uart_send(srvr_id);
            save_message((uint8_t *)srvr_id, strlen(srvr_id));


        } break;

        default:
            break;
    }
}



/**@brief LED Button client 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;
    lbs_c_init_obj.p_gatt_queue  = &m_ble_gatt_queue;
    lbs_c_init_obj.error_handler = lbs_error_handler;

    err_code = ble_lbs_c_init(&m_ble_lbs_c, &lbs_c_init_obj);
    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;

    err_code = nrf_sdh_enable_request();
    APP_ERROR_CHECK(err_code);

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

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

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


/**@brief Function for handling events from the 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 = ble_lbs_led_status_send(&m_ble_lbs_c, button_action);
            if (err_code != NRF_SUCCESS &&
                err_code != BLE_ERROR_INVALID_CONN_HANDLE &&
                err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
            if (err_code == NRF_SUCCESS)
            {
                NRF_LOG_INFO("LBS write LED state %d", button_action);
            }
            break;

        default:
            APP_ERROR_HANDLER(pin_no);
            break;
    }
}


/**@brief Function for handling Scaning events.
 *
 * @param[in]   p_scan_evt   Scanning event.
 */

static void scan_evt_handler0(scan_evt_t const * p_scan_evt)
{
    ret_code_t err_code;
    char cip_cmd[32];
    
    //char message1 [8];

    switch(p_scan_evt->scan_evt_id)
    {
        case NRF_BLE_SCAN_EVT_FILTER_MATCH:
        {
          //nrf_gpio_pin_set(CUSTOM_PIN);
          
          //ble_gap_evt_adv_report_t const * p_adv_report = p_scan_evt->params.filter_match.p_adv_report;
          //ble_gap_addr_t const * addr = &p_adv_report->peer_addr;
        }
        break;

        case NRF_BLE_SCAN_EVT_CONNECTING_ERROR:
            err_code = p_scan_evt->params.connecting_err.err_code;
            APP_ERROR_CHECK(err_code);
            break;
        default:
          break;
    }
}
static void scan_evt_handler(scan_evt_t const * p_scan_evt)
{
    ret_code_t err_code;
    char cip_cmd[32];
    //char rssi_msg[32];
    char rssi_msg2[64];

    switch(p_scan_evt->scan_evt_id)
    {
        case NRF_BLE_SCAN_EVT_FILTER_MATCH:
        {
          nrf_gpio_pin_set(CUSTOM_PIN);
          
          ble_gap_evt_adv_report_t const * p_adv_report = p_scan_evt->params.filter_match.p_adv_report;
          

          int8_t rssi = p_adv_report->rssi;
          
          //snprintf(rssi_msg, sizeof(rssi_msg), "RSSI: %d dBm\r\n", rssi);
          //int len =strlen(rssi_msg);
          
          snprintf(rssi_msg2, sizeof(rssi_msg2), "Beacon Address: %02X:%02X:%02X:%02X:%02X:%02X RSSI: %d dBm\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], rssi);
          int len2 =strlen(rssi_msg2);

          snprintf(cip_cmd, sizeof(cip_cmd), "AT+CIPSEND=%d\r\n", len2);

         
          uart_send(cip_cmd);
          nrf_delay_ms(30);
          uart_send(rssi_msg2);
          nrf_delay_ms(30);

        }
        break;

        case NRF_BLE_SCAN_EVT_CONNECTING_ERROR:
            err_code = p_scan_evt->params.connecting_err.err_code;
            APP_ERROR_CHECK(err_code);
            break;
        default:
          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, ARRAY_SIZE(buttons),
                               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)
{
    ble_lbs_on_db_disc_evt(&m_ble_lbs_c, p_evt);
}


/**@brief Database discovery initialization.
 */
static void db_discovery_init(void)
{
    ble_db_discovery_init_t db_init;

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

    db_init.evt_handler  = db_disc_handler;
    db_init.p_gatt_queue = &m_ble_gatt_queue;

    ret_code_t err_code = ble_db_discovery_init(&db_init);
    APP_ERROR_CHECK(err_code);
}


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

    NRF_LOG_DEFAULT_BACKENDS_INIT();
}


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

static void scan_init0(char *td)
{
    ret_code_t          err_code;
    nrf_ble_scan_init_t init_scan;

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

    init_scan.connect_if_match = true;
    init_scan.conn_cfg_tag     = APP_BLE_CONN_CFG_TAG;
    init_scan.p_scan_param = &m_scan_param;
    


    err_code = nrf_ble_scan_init(&m_scan, &init_scan, scan_evt_handler0);
    APP_ERROR_CHECK(err_code);

    // Setting filters for scanning.
    err_code = nrf_ble_scan_filters_enable(&m_scan, NRF_BLE_SCAN_ADDR_FILTER, false);
    APP_ERROR_CHECK(err_code);
    
    
    //NRF_LOG_INFO(" TD: %d ",td[0]);


    err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_ADDR_FILTER, td);
    //NRF_LOG_INFO(" TD: %d ",td);
    APP_ERROR_CHECK(err_code);

}
static void scan_init(char *td)
{
    ret_code_t          err_code;
    nrf_ble_scan_init_t init_scan;

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

    init_scan.connect_if_match = false;   //true
    init_scan.conn_cfg_tag     = APP_BLE_CONN_CFG_TAG;

    err_code = nrf_ble_scan_init(&m_scan, &init_scan, scan_evt_handler);
    APP_ERROR_CHECK(err_code);

    // Setting filters for scanning.
    err_code = nrf_ble_scan_filters_enable(&m_scan, NRF_BLE_SCAN_ADDR_FILTER, false);
    APP_ERROR_CHECK(err_code);
    
    
    //NRF_LOG_INFO(" TD: %d ",td[0]);


    err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_ADDR_FILTER, td);
    //NRF_LOG_INFO(" TD: %d ",td);
    APP_ERROR_CHECK(err_code);


}


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


/**@brief Function for handling the idle state (main loop).
 *
 * @details Handle any pending log operation(s), then sleep until the next event occurs.
 */
static void idle_state_handle(void)
{
    NRF_LOG_FLUSH();
    nrf_pwr_mgmt_run();
}

void uart_error_handle(app_uart_evt_t * p_event)
{
    if (p_event->evt_type == APP_UART_COMMUNICATION_ERROR)
    {
        APP_ERROR_HANDLER(p_event->data.error_communication);
    }
    else if (p_event->evt_type == APP_UART_FIFO_ERROR)
    {
        APP_ERROR_HANDLER(p_event->data.error_code);
    }
}

/**@brief Function for initializing the UART. */
static void uart_init(void)
{
    ret_code_t err_code;

    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,
        .baud_rate    = UART_BAUDRATE_BAUDRATE_Baud115200
    };

    APP_UART_FIFO_INIT(&comm_params,
                       UART_RX_BUF_SIZE,
                       UART_TX_BUF_SIZE,
                       uart_error_handle,
                       APP_IRQ_PRIORITY_HIGH,
                       err_code);

    APP_ERROR_CHECK(err_code);
}

uint32_t get_timestamp_diff(uint32_t start_ticks)
{
    uint32_t current_ticks = app_timer_cnt_get();
    uint32_t diff_ticks = app_timer_cnt_diff_compute(current_ticks, start_ticks);
    return ((uint64_t)diff_ticks ) / APP_TIMER_CLOCK_FREQ;
}

int main(void)
{
    // Initialize.
    nrf_gpio_cfg_output(CUSTOM_PIN);
    nrf_gpio_pin_clear(CUSTOM_PIN);
    log_init();
    timer_init();
    leds_init();
    buttons_init();
    power_management_init();
    fds_init_helper();
    ble_stack_init();
    
    gatt_init();
    db_discovery_init();
    lbs_c_init();

    // Start execution.
    NRF_LOG_INFO("Blinky CENTRAL example started.");
    
    uart_init();
    // Turn on the LED to signal scanning.
    bsp_board_led_on(CENTRAL_SCANNING_LED);
    char td[][6]= {{0xD5, 0x2A, 0x9D, 0x99, 0xE3, 0xDA},{0xD2, 0xE8, 0x6B, 0x15, 0xD0, 0xD6},{0x3F, 0xCE, 0xC6, 0xF4, 0x40, 0xDA}};
    //char *comand2 

    fds_init_helper();

    load_message();

    char comand1a[]="AT+CWJAP=\"";
    //char comand1c[]= 
    char comand2a[] = "AT+CIPSTART=\"TCP\",\"";
    char comand2c[] = "\",3000\r\n";
    char comand20[36];
    char comand2[47];
  
    //uart_send("HelloESP01\r\n");
    nrf_delay_ms(3000);

    uart_send("AT\r\n");
    nrf_delay_ms(1000);

    uart_send("AT+CIPSEND=10\r\n");
    nrf_delay_ms(100);
    uart_send("HelloESP03\r\n");
    nrf_delay_ms(100);

    uart_send("AT+CIPSTART=\"POCO M5s\",\"bdsdnhhvdmk12\"\r\n");
    nrf_delay_ms(4000);


    char cip_cmd[32];
    uint32_t start_ticks = app_timer_cnt_get();
    
    //uint32_t current_ticks = app_timer_cnt_get();
    while ((get_timestamp_diff(start_ticks) < 15))
    {
        // Let SoftDevice handle BLE events
        sd_app_evt_wait();  // This avoids freezing BLE stack
        scan_init0(td[2]);
        ble_uuid128_t base_uuid = { CUSTOM_SERVICE_UUID_BASE };
        sd_ble_uuid_vs_add(&base_uuid, &m_custom_uuid.type);
        m_custom_uuid.uuid = CUSTOM_SERVICE_UUID;

        scan_start();    
    }
    sprintf(comand20, "%s%s", comand2a,srvr_id); 
    sprintf(comand2, "%s%s", comand20,comand2c);
    uart_send(comand2);

    nrf_delay_ms(2000);
    // Enter main loop.
    for (;;)
    {
        scan_init(td[0]);
        scan_start();
        
        //gatt_init();
        //db_discovery_init();
        idle_state_handle();
        scan_init(td[1]);
        scan_start();

        //gatt_init();
        //db_discovery_init();
        idle_state_handle();
        

    }
}

Parents
  • This is an interesting technical issue. Working with multiple custom characteristics in the same BLE service can sometimes cause confusion if the UUIDs or handles are not referenced correctly on the central side. Often the problem is related to how the service discovery process stores the handles for each characteristic.

    In many technical fields, having clear reference systems helps avoid confusion when dealing with structured data. For example, resources like https://militarytimecharts.com/ help simplify systems such as the 24-hour time format that is widely used in engineering, aviation, and other technical environments.

Reply
  • This is an interesting technical issue. Working with multiple custom characteristics in the same BLE service can sometimes cause confusion if the UUIDs or handles are not referenced correctly on the central side. Often the problem is related to how the service discovery process stores the handles for each characteristic.

    In many technical fields, having clear reference systems helps avoid confusion when dealing with structured data. For example, resources like https://militarytimecharts.com/ help simplify systems such as the 24-hour time format that is widely used in engineering, aviation, and other technical environments.

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