Cannot reconfigure BLE peripheral UART example to send data I have stored in buffer please help

[mjconnor57]

Hello I have seen ALOT of posts referencing to first build and run ble peripheral uart example and then from there that it will be easy to remove the uart from the functionality if so desired but I cannot seem to get this to work.

I have tried many different approaches over the past few weeks and no matter what I do I cannot get an app up and running that allows me to use my PCB as peripheral that automatically sends a buffer of data (a bunch of SSIDs concatenated) on connection of central device (NRF Connect app). Is there please a snippet of code you can provide me that shows how to go from using the uart to having my own custom service that just sends a buffered message over ble?

[Jared]

Hi there,

Are you using nRF Connect SDK or the nRF5SDK and which version are you using?

regards

Jared 

[mjconnor57]

HI Jared our project is based on using the UART BLE peripheral example in NRF5SDK SDK version 17.1. Thank you for your quick response.

[mjconnor57]

I am able to split the messages into 20 byte chunks with a small function but oddly, my code execution stays at the first:

              err_code = ble_nus_data_send(&m_nus, data_array1, &length, m_conn_handle); call

Despite the data_array1 appearing at NRFConnect on my Android... should I be looking for confirmation

[mjconnor57]

I have stripped ble_nus_data_send() completely down to this for sending 8 20 byte packets:

    case APP_UART_DATA_READY:

            NRF_LOG_DEBUG("Ready to send data over BLE NUS");

              ble_nus_data_send(&m_nus, data_array1, &packetSize, m_conn_handle);
              ble_nus_data_send(&m_nus, data_array2, &packetSize, m_conn_handle);
              ble_nus_data_send(&m_nus, data_array3, &packetSize, m_conn_handle);
              ble_nus_data_send(&m_nus, data_array4, &packetSize, m_conn_handle);
              ble_nus_data_send(&m_nus, data_array5, &packetSize, m_conn_handle);
              ble_nus_data_send(&m_nus, data_array6, &packetSize, m_conn_handle);
              ble_nus_data_send(&m_nus, data_array7, &packetSize, m_conn_handle);
              ble_nus_data_send(&m_nus, data_array8, &packetSize, m_conn_handle);
              break;

But oddly, execution just keeps cycling through the sends and does not break after the 8th, does that make sense?

[Jared]

HI Matt,

You mean that the program "spins" in  the APP_UART_DATA_READY switch case? Are you sending a lot off data? Maybe the APP_UAR_DATA_READY event is just generated multiple times because you're trying to send much data at a time.

regards

Jared 

[mjconnor57]

Yes that is what it is doing, but I am only sending 20 bytes per nus_data_send() per your earlier instruction, perhaps it is my invocation?

static void idle_state_handle(void)
{
    static int index = 1;
    app_sched_execute();

    cli_process();

    (void)NRF_LOG_PROCESS();

   if (m_conn_handle != BLE_CONN_HANDLE_INVALID)
   {
      uart_event_handle(APP_UART_DATA_READY);
   }

}

[Jared]

Hi,

Can you share your main.c file?

regards

Jared

[mjconnor57]

/**
 * Copyright (c) 2014 - 2019, Nordic Semiconductor ASA
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
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 * 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
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 *
 * 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.
 *
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 *
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 * 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.
 *
 */
/** @file
 *
 * @defgroup ble_sdk_uart_over_ble_main main.c
 * @{
 * @ingroup  ble_sdk_app_nus_eval
 * @brief    UART over BLE application main file.
 *
 * This file contains the source code for a sample application that uses the Nordic UART service.
 * This application uses the @ref srvlib_conn_params module.
 */


#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include "sdk_config.h"
#include "nordic_common.h"
#include "nrf.h"
#include "ble_hci.h"
#include "ble_advdata.h"
#include "ble_advertising.h"
#include "ble_conn_params.h"
#include "nrf_sdh.h"
#include "nrf_sdh_soc.h"
#include "nrf_sdh_ble.h"
#include "nrf_ble_gatt.h"
#include "nrf_ble_qwr.h"
#include "nrf_delay.h"
#include "nrf_drv_clock.h"
#include "app_timer.h"
#include "ble_nus.h"
#include "app_util_platform.h"
#include "app_scheduler.h"
#include "bsp_btn_ble.h"
#include "nrf_pwr_mgmt.h"
#include "app_uart.h"

#include "u_version.h"
#include "u_app.h"
#include "u_cli.h"
#include "u_nest.h"
#include "u_timers.h"

#include "esp32_wroom.h"
#include "ble_cus.h"

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

// Scheduler sizes
// TODO: Determine an actual fact-based max event size and queue size.
#define APP_SCHED_MAX_EVENT_SIZE    32u
#define APP_SCHED_QUEUE_SIZE        256u

//#ifdef USE_BLE
#define APP_BLE_CONN_CFG_TAG            1                                           /**< A tag identifying the SoftDevice BLE configuration. */

#define DEVICE_NAME                     "OVVi_connect"                               /**< Name of device. Will be included in the advertising data. */
#define NUS_SERVICE_UUID_TYPE           BLE_UUID_TYPE_VENDOR_BEGIN                  /**< UUID type for the Nordic UART Service (vendor specific). */

#define APP_BLE_OBSERVER_PRIO           3                                           /**< Application's BLE observer priority. You shouldn't need to modify this value. */

#define APP_ADV_INTERVAL                64                                          /**< The advertising interval (in units of 0.625 ms. (64)This value corresponds to 40 ms). */

#define APP_ADV_DURATION                0 // MC 18000                               /**< The advertising duration (180 seconds) in units of 10 milliseconds. */ //This is what puts the app to sleep after 3 minutes

#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(20, UNIT_1_25_MS)             /**< Minimum acceptable connection interval (20 ms), Connection interval uses 1.25 ms units. */
#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(75, UNIT_1_25_MS)             /**< Maximum acceptable connection interval (75 ms), Connection interval uses 1.25 ms units. */
#define SLAVE_LATENCY                   0                                           /**< Slave latency. */
#define CONN_SUP_TIMEOUT                MSEC_TO_UNITS(4000, UNIT_10_MS)             /**< Connection supervisory timeout (4 seconds), Supervision Timeout uses 10 ms units. */
#define FIRST_CONN_PARAMS_UPDATE_DELAY  APP_TIMER_TICKS(5000)                       /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY   APP_TIMER_TICKS(30000)                      /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */
#define MAX_CONN_PARAMS_UPDATE_COUNT    3                                           /**< Number of attempts before giving up the connection parameter negotiation. */

#define PASSKEY_TXT                     "Passkey:"                                  /**< Message to be displayed together with the pass-key. */
#define PASSKEY_TXT_LENGTH              8                                           /**< Length of message to be displayed together with the pass-key. */
#define PASSKEY_LENGTH                  6                                           /**< Length of pass-key received by the stack for display. */
#define STATIC_PASSKEY            "123456"                                     /**< Static pin. */

#define APP_FEATURE_NOT_SUPPORTED       BLE_GATT_STATUS_ATTERR_APP_BEGIN + 2       /**< Reply when unsupported features are requested. */

static ble_gap_opt_t            m_static_pin_option;                        /**< Pointer to the struct containing static pin option. */

#define DEAD_BEEF                       0xDEADBEEF                                  /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */

#define UART_TX_BUF_SIZE                256                                         /**< UART TX buffer size. */
#define UART_RX_BUF_SIZE                256                                         /**< UART RX buffer size. */

// ESP32 Def
/*
#define AP_SSID                         "F58516"
#define AP_PWD                          "65916957"*/

APP_TIMER_DEF(tx_timer);                      //defining timer
#define NOTIFICATION_INTERVAL           APP_TIMER_TICKS(1000)  

uint32_t err_code = 0u;

BLE_NUS_DEF(m_nus, NRF_SDH_BLE_TOTAL_LINK_COUNT);                                   /**< BLE NUS service instance. */
NRF_BLE_GATT_DEF(m_gatt);                                                           /**< GATT module instance. */
NRF_BLE_QWR_DEF(m_qwr);                                                             /**< Context for the Queued Write module.*/ //qwrS for multiple connections
BLE_ADVERTISING_DEF(m_advertising);                                                 /**< Advertising module instance. */

static uint16_t   m_conn_handle          = BLE_CONN_HANDLE_INVALID;                 /**< Handle of the current connection. */
static uint16_t   m_ble_nus_max_data_len = BLE_GATT_ATT_MTU_DEFAULT - 3;            /**< Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic UART service module. */
static ble_uuid_t m_adv_uuids[]          =                                          /**< Universally unique service identifier. */
{
    {BLE_UUID_NUS_SERVICE, NUS_SERVICE_UUID_TYPE}
};

static int transmission_complete = 0;

/**@brief Function for assert macro callback.
 *
 * @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 analyse
 *          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(DEAD_BEEF, line_num, p_file_name);
}

/**@brief Function for the GAP initialization.
 *
 * @details This function will set up all the necessary GAP (Generic Access Profile) parameters of
 *          the device. It also sets the permissions and appearance.
 */
static void gap_params_init(void)
{
    uint32_t                err_code;
    ble_gap_conn_params_t   gap_conn_params;
    ble_gap_conn_sec_mode_t sec_mode;

    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&sec_mode); // Use encryption with no man in the middle so any malicious actors cannot read encrypted wifi parameters

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

    err_code = sd_ble_gap_appearance_set(BLE_APPEARANCE_GENERIC_HID); //creating custom services and unique application

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

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

    err_code = sd_ble_gap_ppcp_set(&gap_conn_params); //Allows master device to acccept or dictate connection params to Nordic
    APP_ERROR_CHECK(err_code);

}

// C substring function definition
void substring(char s[], uint8_t sub[], int p, int l) {
   int c = 0;
   
   while (c < l) {
      sub[c] = s[p+c-1];
      c++;
   }
   sub[c] = '\0';
}

/**@brief   Function for sending SSIDs to.
 *
 * @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.
 */
/**@snippet [Handling the data received over UART] */
void uart_event_handle(app_uart_evt_t * p_event)
{
    static uint8_t data_array1[20];
    substring(bleBuff, data_array1, 0, 20);
    static uint8_t data_array2[20];
    substring(bleBuff, data_array2, 20, 20);
    static uint8_t data_array3[20];
    substring(bleBuff, data_array3, 40, 20);
    static uint8_t data_array4[20];
    substring(bleBuff, data_array4, 60, 20);
    static uint8_t data_array5[20];
    substring(bleBuff, data_array5, 80, 20);
    static uint8_t data_array6[20];
    substring(bleBuff, data_array6, 100, 20);
    static uint8_t data_array7[20];
    substring(bleBuff, data_array7, 120, 20);
    static uint8_t data_array8[20];
    substring(bleBuff, data_array8, 140, 20);

    uint32_t       err_code;
    static int lengthOfMessage;
    lengthOfMessage = sizeof(bleBuff);
    uint16_t  packetSize = 20;
    static int packetCount = 0;

    packetCount = (lengthOfMessage / packetSize) +.5;

    switch (p_event->evt_type)
    {

    case APP_UART_DATA_READY:
            nrf_delay_ms(2000);
            NRF_LOG_INFO("Ready to send data over BLE NUS");

                  err_code = ble_nus_data_send(&m_nus, data_array1, &packetSize, m_conn_handle);
                  NRF_LOG_INFO("ble_nus_data_send returned %d", err_code);
                  err_code = ble_nus_data_send(&m_nus, data_array2, &packetSize, m_conn_handle);
                  NRF_LOG_INFO("ble_nus_data_send returned %d", err_code);
                  err_code = ble_nus_data_send(&m_nus, data_array3, &packetSize, m_conn_handle);
                  NRF_LOG_INFO("ble_nus_data_send returned %d", err_code);
                  err_code = ble_nus_data_send(&m_nus, data_array4, &packetSize, m_conn_handle);
                  NRF_LOG_INFO("ble_nus_data_send returned %d", err_code);
                  err_code = ble_nus_data_send(&m_nus, data_array5, &packetSize, m_conn_handle);
                  NRF_LOG_INFO("ble_nus_data_send returned %d", err_code);
                  err_code = ble_nus_data_send(&m_nus, data_array6, &packetSize, m_conn_handle);
                  NRF_LOG_INFO("ble_nus_data_send returned %d", err_code);
                  err_code = ble_nus_data_send(&m_nus, data_array7, &packetSize, m_conn_handle);
                  NRF_LOG_INFO("ble_nus_data_send returned %d", err_code);
                  err_code = ble_nus_data_send(&m_nus, data_array8, &packetSize, m_conn_handle);
                  NRF_LOG_INFO("ble_nus_data_send returned %d", err_code);
            break;

    case APP_UART_COMMUNICATION_ERROR:
      APP_ERROR_HANDLER(p_event->data.error_communication);
      break;

    case APP_UART_FIFO_ERROR:
      APP_ERROR_HANDLER(p_event->data.error_code);
      break;

    default:
      break;
    }
}
/**@snippet [Handling the data received over UART] */



/**@brief Function for handling the data from the Nordic UART Service.
 *
 * @details This function will process the data received from the Nordic UART BLE Service and send
 *          it to the UART module.
 *
 * @param[in] p_evt       Nordic UART Service event.
 */
/**@snippet [Handling the data received over BLE] */

typedef enum{
  AP_SSID,
  AP_PWD
}ble_msgs;

bool ble_tx_enable = true;


static void nus_data_handler(ble_nus_evt_t * p_evt)
{
    uint16_t length;
    static char data_array[40];
    static char temp_data_array[40];
    static uint8_t index = 0;

    char ap_ssid[40];
    char ap_pwd[40];


    if (p_evt->type == BLE_NUS_EVT_RX_DATA)
    {
        uint32_t err_code;

        NRF_LOG_INFO("Received data from BLE NUS. Writing data on UART.");
        NRF_LOG_HEXDUMP_DEBUG(data_array, p_evt->params.rx_data.length);

        switch(p_evt->params.rx_data.p_data[0])
        {

          case AP_SSID:
            index = 0;

            while(p_evt->params.rx_data.p_data[index] != 0x3F)
            {
              app_uart_put(p_evt->params.rx_data.p_data[index]);
              index++;
            }

            app_uart_put(0x0A);

            break;

          case AP_PWD:

            index = 0;

            while(p_evt->params.rx_data.p_data[index] != 0x3F)
            {
              app_uart_put(p_evt->params.rx_data.p_data[index]);
              index++;
            }

            app_uart_put(0x0A);

            break;

          default:
            break;
         }

   }
 
}
/**@snippet [Handling the data received over BLE] */





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


/**@brief Function for initializing services that will be used by the application.
 */
static void services_init(void)
{
    uint32_t           err_code;
    ble_nus_init_t     nus_init;
    nrf_ble_qwr_init_t qwr_init = {0};

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

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

    // Initialize NUS.
    memset(&nus_init, 0, sizeof(nus_init));

    nus_init.data_handler = nus_data_handler;

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


/**@brief Function for handling an event from the Connection Parameters Module.
 *
 * @details This function will be called for all events in the Connection Parameters Module
 *          which are passed to the application.
 *
 * @note All this function does is to disconnect. This could have been done by simply setting
 *       the disconnect_on_fail config parameter, but instead we use the event handler
 *       mechanism to demonstrate its use.
 *
 * @param[in] p_evt  Event received from the Connection Parameters Module.
 */
static void on_conn_params_evt(ble_conn_params_evt_t * p_evt)
{
    uint32_t err_code;

    if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)
    {
        err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
        APP_ERROR_CHECK(err_code);
    }
}


/**@brief Function for handling errors from the Connection Parameters module.
 *
 * @param[in] nrf_error  Error code containing information about what went wrong.
 */
static void conn_params_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}


/**@brief Function for initializing the Connection Parameters module.
 */
static void conn_params_init(void)
{
    uint32_t               err_code;
    ble_conn_params_init_t cp_init;

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

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

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


/**@brief Function for handling advertising events.
 *
 * @details This function will be called for advertising events which are passed to the application.
 *
 * @param[in] ble_adv_evt  Advertising event.
 */
static void on_adv_evt(ble_adv_evt_t ble_adv_evt)
{
    uint32_t err_code;

    switch (ble_adv_evt)
    {
        case BLE_ADV_EVT_FAST:
            err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING); // blink LED for 1 second duration
            APP_ERROR_CHECK(err_code);
            break;
        case BLE_ADV_EVT_IDLE:
            //sleep_mode_enter();
            break;
        default:
            break;
    }
}


/**@brief Function for handling BLE events.
 *
 * @param[in]   p_ble_evt   Bluetooth stack event.
 * @param[in]   p_context   Unused.
 */
static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
    uint32_t err_code;
    ble_gatts_rw_authorize_reply_params_t auth_reply;

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            NRF_LOG_INFO("New Device is Connected");
            err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
            APP_ERROR_CHECK(err_code);
            m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
            err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle);
            APP_ERROR_CHECK(err_code);
            //on_connected(BLE_GAP_EVT_CONNECTED);
            break;

        case BLE_GAP_EVT_DISCONNECTED:
            NRF_LOG_INFO("Device is Disconnected");
            // LED indication will be changed when advertising starts.
            m_conn_handle = BLE_CONN_HANDLE_INVALID;
            break;

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

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

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

        case BLE_GATTC_EVT_TIMEOUT:
            // Disconnect on GATT Client timeout event.
            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.
            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 the SoftDevice initialization.
 *
 * @details This function initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    ret_code_t err_code;

    err_code = nrf_sdh_enable_request();
    APP_ERROR_CHECK(err_code);

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

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

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


/**@brief Function for handling events from the GATT library. */
void gatt_evt_handler(nrf_ble_gatt_t * p_gatt, nrf_ble_gatt_evt_t const * p_evt)
{
    if ((m_conn_handle == p_evt->conn_handle) && (p_evt->evt_id == NRF_BLE_GATT_EVT_ATT_MTU_UPDATED))
    {
        m_ble_nus_max_data_len = p_evt->params.att_mtu_effective - OPCODE_LENGTH - HANDLE_LENGTH;
        NRF_LOG_INFO("Data len is set to 0x%X(%d)", m_ble_nus_max_data_len, m_ble_nus_max_data_len);
    }
    NRF_LOG_DEBUG("ATT MTU exchange completed. central 0x%x peripheral 0x%x",
                  p_gatt->att_mtu_desired_central,
                  p_gatt->att_mtu_desired_periph);
}


/**@brief Function for initializing the GATT library. */
void gatt_init(void)
{
    ret_code_t err_code;

    err_code = nrf_ble_gatt_init(&m_gatt, gatt_evt_handler);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_ble_gatt_att_mtu_periph_set(&m_gatt, NRF_SDH_BLE_GATT_MAX_MTU_SIZE);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling events from the BSP module.
 *
 * @param[in]   event   Event generated by button press.
 */
void bsp_event_handler(bsp_event_t event)
{
    uint32_t err_code;
    switch (event)
    {
        case BSP_EVENT_SLEEP:
            sleep_mode_enter();
            break;

        case BSP_EVENT_DISCONNECT:
            err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            if (err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
            break;

        case BSP_EVENT_WHITELIST_OFF:
            if (m_conn_handle == BLE_CONN_HANDLE_INVALID)
            {
                err_code = ble_advertising_restart_without_whitelist(&m_advertising);
                if (err_code != NRF_ERROR_INVALID_STATE)
                {
                    APP_ERROR_CHECK(err_code);
                }
            }
            break;

        default:
            break;
    }
}


/**@brief Function for initializing the Advertising functionality.
 */
static void advertising_init(void)
{
    uint32_t               err_code;
    ble_advertising_init_t init;

    memset(&init, 0, sizeof(init));

    init.advdata.name_type          = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance = true;  //false 10/19/2022
    init.advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE; //Changed from GENERAL_DISC by MC 08/22/22

    init.srdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.srdata.uuids_complete.p_uuids  = m_adv_uuids;

    init.config.ble_adv_fast_enabled  = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout  = APP_ADV_DURATION;
    init.evt_handler = on_adv_evt;

    err_code = ble_advertising_init(&m_advertising, &init);
    APP_ERROR_CHECK(err_code);

    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);

}

/**@brief Function for starting advertising.
 */
static void advertising_start(void)
{
    uint32_t err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);
    APP_ERROR_CHECK(err_code);
}


void send_data_BLE(uint16_t length, char * data_array)
{
    uint32_t err_code;
    err_code = ble_nus_data_send(&m_nus, data_array, &length, m_conn_handle);
}
//#endif



/**@brief Function for initializing the Power Management.
 */

static void power_management_init(void)
{
  ret_code_t err_code = nrf_pwr_mgmt_init();
  APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing the BSP(LEDs).
 */

static void leds_init(void)
{
  ret_code_t err_code = bsp_init(BSP_INIT_LEDS, NULL);
  APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing the timer module.
 */
static void timers_init(void)
{
    ret_code_t err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);
//    err_code = app_timer_create(&tx_timer,
//                                APP_TIMER_MODE_REPEATED,
//                                send_message);
}

/** @brief Function starting the internal LFCLK XTAL oscillator.
 */
static void lfclk_config(void)
{
    ret_code_t err_code = nrf_drv_clock_init();
    APP_ERROR_CHECK(err_code);

    nrf_drv_clock_lfclk_request(NULL);
}

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

    NRF_LOG_DEFAULT_BACKENDS_INIT();
}

/**@brief Function for handling the idle state (main loop).
 *
 * @details If there is no pending log operation, then sleep until next the next event occurs.
 */
static void idle_state_handle(void)
{
    static int index = 1;
    app_sched_execute();

    cli_process();

    (void)NRF_LOG_PROCESS();

   if ((m_conn_handle != BLE_CONN_HANDLE_INVALID) && (index == 1))
   {
      uart_event_handle(APP_UART_DATA_READY);
      nus_data_handler(BLE_NUS_EVT_RX_DATA);
      index++;
   }
}

/**@brief Application main function.
 */
int main(void)
{

    #if CONFIG_JLINK_MONITOR_ENABLED
    NVIC_SetPriority(DebugMonitor_IRQn, _PRIO_SD_LOW);
    #endif

    nrf_delay_ms(1000);
    lfclk_config();

    //********* Initialize.***************
    log_init();

    // Initialize the app scheduler and the app timer.
    APP_SCHED_INIT(APP_SCHED_MAX_EVENT_SIZE, APP_SCHED_QUEUE_SIZE);
    timers_init();

    leds_init();

//#ifdef USE_BLE
    ble_stack_init();
    gap_params_init();
    gatt_init();
    services_init();
    advertising_init();
    conn_params_init();
//#endif

    cli_init();
    init_System();

    const version_t * const p_version = version_get();
    NRF_LOG_INFO("Firmware version: " VERSION_FORMAT,
                    p_version->major,
                    p_version->minor,
                    p_version->build);

   // app_timer_start(tx_timer, NOTIFICATION_INTERVAL, NULL);
    // Start execution.
    advertising_start();

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


      idle_state_handle();
    }
}

/**
 * @}
 */

[mjconnor57]

I think I may have solved it by adding in the index++

to

   if ((m_conn_handle != BLE_CONN_HANDLE_INVALID) && (index == 1))
   {
      uart_event_handle(APP_UART_DATA_READY);
      nus_data_handler(BLE_NUS_EVT_RX_DATA);
      index++;
   }

I am just not sure how "good" of a solution it is. It only send the data once then waits for a response

[mjconnor57]

Does my nus_data_handler seem valid for accepting the 2 discrete values from the central, a ssid and pwd?