rt-thread/bsp/nrf52832/applications/ble_nus_app.c

#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 "softdevice_handler.h"
#include "nrf_ble_gatt.h"
#include "app_timer.h"
#include "ble_nus.h"
#include "app_util_platform.h"

#include <rtthread.h>

typedef rt_size_t (*BLE_NOTIFY_T)(rt_uint8_t *buf, rt_uint16_t size);

#define STACK_EVT_MQ_NUM        10

#define FAST_ADV()          \
    do {                    \
        uint32_t err_code;  \
        err_code = ble_advertising_start(BLE_ADV_MODE_FAST);    \
        APP_ERROR_CHECK(err_code);  \
    } while(0)

typedef enum
{
    STACK_EV_DISCON = 1,
    STACK_EV_DISPATCH = 2,
    STACK_EV_KEY = 4,
} STACK_EV_E;

typedef struct
{
    rt_list_t node;
    void* evt;
} evt_list_t;

typedef enum
{
    STACK_STATE_IDLE = 0,
    STACK_STATE_ADV = 1,
    STACK_STATE_CON = 2,
    STACK_STATE_DISC = 3
} STACK_STATE_E;

STACK_STATE_E stack_state = STACK_STATE_IDLE;

rt_event_t stack_event;
rt_sem_t sd_evt_sem;
rt_mq_t stack_evt_mq;
rt_uint8_t *evt_sample;

BLE_NOTIFY_T rx_notify = RT_NULL;

// Low frequency clock source to be used by the SoftDevice
#define NRF_CLOCK_LFCLKSRC      {.source        = NRF_CLOCK_LF_SRC_XTAL,            \
                                 .rc_ctiv       = 0,                                \
                                 .rc_temp_ctiv  = 0,                                \
                                 .xtal_accuracy = NRF_CLOCK_LF_XTAL_ACCURACY_20_PPM}


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

#define DEVICE_NAME                     "Nordic_UART"                               /**< 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_ADV_INTERVAL                64                                          /**< The advertising interval (in units of 0.625 ms. This value corresponds to 40 ms). */
#define APP_ADV_TIMEOUT_IN_SECONDS      30                                         /**< The advertising timeout (in units of seconds). */

#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 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. */

static ble_nus_t                        m_nus;                                      /**< Structure to identify the Nordic UART Service. */
static uint16_t                         m_conn_handle = BLE_CONN_HANDLE_INVALID;    /**< Handle of the current connection. */

static nrf_ble_gatt_t                   m_gatt;                                     /**< GATT module instance. */
static ble_uuid_t                       m_adv_uuids[] = {{BLE_UUID_NUS_SERVICE, NUS_SERVICE_UUID_TYPE}};  /**< Universally unique service identifier. */
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. */

/**@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_OPEN(&sec_mode);

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

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

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

    err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for 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_nus    Nordic UART Service structure.
 * @param[in] p_data   Data to be send to UART module.
 * @param[in] length   Length of the data.
 */
/**@snippet [Handling the data received over BLE] */
static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
    rt_kprintf("Received data from BLE NUS. Writing data on UART.\r\n");

    for (uint32_t i = 0; i < length; i++)
    {
        rt_kprintf("%02x ", p_data[i]);
    }

    // ble_send(p_data, length);

    if (rx_notify != RT_NULL)
    {
        rx_notify(p_data, length);
    }
}
/**@snippet [Handling the data received over BLE] */


/**@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;

    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);
            // APP_ERROR_CHECK(err_code);
            stack_state = STACK_STATE_ADV;
            rt_kprintf("fast advert\n");
            break;
        case BLE_ADV_EVT_IDLE:
            // sleep_mode_enter();
            stack_state = STACK_STATE_IDLE;
            rt_kprintf("advert idle\n");
            break;
        default:
            break;
    }
}


/**@brief Function for the application's SoftDevice event handler.
 *
 * @param[in] p_ble_evt SoftDevice event.
 */
static void on_ble_evt(ble_evt_t * p_ble_evt)
{
    uint32_t err_code;

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_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;
            stack_state = STACK_STATE_CON;
            rt_kprintf("Connected\r\n");
            break; // BLE_GAP_EVT_CONNECTED

        case BLE_GAP_EVT_DISCONNECTED:
            // err_code = bsp_indication_set(BSP_INDICATE_IDLE);
            // APP_ERROR_CHECK(err_code);
            m_conn_handle = BLE_CONN_HANDLE_INVALID;
            stack_state = STACK_STATE_DISC;
            rt_kprintf("Disconnected\r\n");
            break; // BLE_GAP_EVT_DISCONNECTED

        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; // BLE_GAP_EVT_SEC_PARAMS_REQUEST

        case BLE_GAP_EVT_DATA_LENGTH_UPDATE_REQUEST:
        {
            ble_gap_data_length_params_t dl_params;

            // Clearing the struct will effectivly set members to @ref BLE_GAP_DATA_LENGTH_AUTO
            memset(&dl_params, 0, sizeof(ble_gap_data_length_params_t));
            err_code = sd_ble_gap_data_length_update(p_ble_evt->evt.gap_evt.conn_handle, &dl_params, 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; // BLE_GATTS_EVT_SYS_ATTR_MISSING

        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; // BLE_GATTC_EVT_TIMEOUT

        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; // BLE_GATTS_EVT_TIMEOUT

        case BLE_EVT_USER_MEM_REQUEST:
            err_code = sd_ble_user_mem_reply(p_ble_evt->evt.gattc_evt.conn_handle, NULL);
            APP_ERROR_CHECK(err_code);
            break; // BLE_EVT_USER_MEM_REQUEST

        case BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST:
        {
            ble_gatts_evt_rw_authorize_request_t  req;
            ble_gatts_rw_authorize_reply_params_t auth_reply;

            req = p_ble_evt->evt.gatts_evt.params.authorize_request;

            if (req.type != BLE_GATTS_AUTHORIZE_TYPE_INVALID)
            {
                if ((req.request.write.op == BLE_GATTS_OP_PREP_WRITE_REQ)     ||
                    (req.request.write.op == BLE_GATTS_OP_EXEC_WRITE_REQ_NOW) ||
                    (req.request.write.op == BLE_GATTS_OP_EXEC_WRITE_REQ_CANCEL))
                {
                    if (req.type == BLE_GATTS_AUTHORIZE_TYPE_WRITE)
                    {
                        auth_reply.type = BLE_GATTS_AUTHORIZE_TYPE_WRITE;
                    }
                    else
                    {
                        auth_reply.type = BLE_GATTS_AUTHORIZE_TYPE_READ;
                    }
                    auth_reply.params.write.gatt_status = APP_FEATURE_NOT_SUPPORTED;
                    err_code = sd_ble_gatts_rw_authorize_reply(p_ble_evt->evt.gatts_evt.conn_handle,
                                                               &auth_reply);
                    APP_ERROR_CHECK(err_code);
                }
            }
        } break; // BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST

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


/**@brief Function for dispatching a SoftDevice event to all modules with a SoftDevice
 *        event handler.
 *
 * @details This function is called from the SoftDevice event interrupt handler after a
 *          SoftDevice event has been received.
 *
 * @param[in] p_ble_evt  SoftDevice event.
 */
static void ble_evt_dispatch(ble_evt_t * p_ble_evt)
{
    if (rt_mq_send(stack_evt_mq, p_ble_evt, p_ble_evt->header.evt_len) != RT_EOK)
    {
        rt_kprintf("dispatch malloc failure\n");
    }
    else
    {
        rt_event_send(stack_event, STACK_EV_DISPATCH);
    }
}

static rt_err_t evt_dispatch_worker(void)
{
    ble_evt_t * p_ble_evt = (ble_evt_t *)evt_sample;
    rt_err_t err;

    err = rt_mq_recv(stack_evt_mq, (void*)evt_sample, BLE_STACK_EVT_MSG_BUF_SIZE, RT_WAITING_NO);

    if (RT_EOK == err)
    {
        ble_conn_params_on_ble_evt(p_ble_evt);
        nrf_ble_gatt_on_ble_evt(&m_gatt, p_ble_evt);
        ble_nus_on_ble_evt(&m_nus, p_ble_evt);
        on_ble_evt(p_ble_evt);
        ble_advertising_on_ble_evt(p_ble_evt);
        // bsp_btn_ble_on_ble_evt(p_ble_evt);

        rt_kprintf("ble evt dispatch\n");
    }

    return err;
}

static uint32_t _softdevice_evt_schedule(void)
{
    rt_sem_release(sd_evt_sem);

    return NRF_SUCCESS;
}

/**@brief Function for the SoftDevice initialization.
 *
 * @details This function initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    uint32_t err_code;

    nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;

    // Initialize SoftDevice.
    SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, _softdevice_evt_schedule);

    // 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  = BLE_GAP_ROLE_COUNT_PERIPH_DEFAULT;
    ble_cfg.gap_cfg.role_count_cfg.central_role_count = 0;
    ble_cfg.gap_cfg.role_count_cfg.central_sec_count  = 0;
    err_code = sd_ble_cfg_set(BLE_GAP_CFG_ROLE_COUNT, &ble_cfg, ram_start);
    APP_ERROR_CHECK(err_code);

    // Configure the maximum ATT MTU.
    memset(&ble_cfg, 0x00, sizeof(ble_cfg));
    ble_cfg.conn_cfg.conn_cfg_tag                 = CONN_CFG_TAG;
    ble_cfg.conn_cfg.params.gatt_conn_cfg.att_mtu = NRF_BLE_GATT_MAX_MTU_SIZE;
    err_code = sd_ble_cfg_set(BLE_CONN_CFG_GATT, &ble_cfg, ram_start);
    APP_ERROR_CHECK(err_code);

    // Configure the maximum event length.
    memset(&ble_cfg, 0x00, sizeof(ble_cfg));
    ble_cfg.conn_cfg.conn_cfg_tag                     = CONN_CFG_TAG;
    ble_cfg.conn_cfg.params.gap_conn_cfg.event_length = 320;
    ble_cfg.conn_cfg.params.gap_conn_cfg.conn_count   = BLE_GAP_CONN_COUNT_DEFAULT;
    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);

    // Subscribe for BLE events.
    err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for handling events from the GATT library. */
static void gatt_evt_handler(nrf_ble_gatt_t * p_gatt, const nrf_ble_gatt_evt_t * 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;
        rt_kprintf("Data len is set to 0x%X(%d)\r\n", m_ble_nus_max_data_len, m_ble_nus_max_data_len);
    }
    rt_kprintf("ATT MTU exchange completed. central 0x%x peripheral 0x%x\r\n", p_gatt->att_mtu_desired_central, p_gatt->att_mtu_desired_periph);
}

/**@brief Function for initializing the GATT library. */
static 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, 64);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for initializing the Advertising functionality.
 */
static void advertising_init(void)
{
    uint32_t               err_code;
    ble_advdata_t          advdata;
    ble_advdata_t          scanrsp;
    ble_adv_modes_config_t options;

    // Build advertising data struct to pass into @ref ble_advertising_init.
    memset(&advdata, 0, sizeof(advdata));
    advdata.name_type          = BLE_ADVDATA_FULL_NAME;
    advdata.include_appearance = false;
    advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

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

    memset(&options, 0, sizeof(options));
    options.ble_adv_fast_enabled  = true;
    options.ble_adv_fast_interval = APP_ADV_INTERVAL;
    options.ble_adv_fast_timeout  = APP_ADV_TIMEOUT_IN_SECONDS;

    err_code = ble_advertising_init(&advdata, &scanrsp, &options, on_adv_evt, NULL);
    APP_ERROR_CHECK(err_code);

    ble_advertising_conn_cfg_tag_set(CONN_CFG_TAG);
}

/**@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.
 */
/**@snippet [Handling the data received over UART] */
void uart_event_handle(rt_device_t uart)
{
    uint8_t data_array[BLE_NUS_MAX_DATA_LEN];
    rt_size_t size = 0;
    uint32_t       err_code;

    size = rt_device_read(uart, 0, data_array, BLE_NUS_MAX_DATA_LEN);

    if (size <= 0)
    {
        return;
    }

    do
    {
        err_code = ble_nus_string_send(&m_nus, data_array, size);
        if ( (err_code != NRF_ERROR_INVALID_STATE) && (err_code != NRF_ERROR_BUSY) )
        {
            APP_ERROR_CHECK(err_code);
        }
    } while (err_code == NRF_ERROR_BUSY);
}
/**@snippet [Handling the data received over UART] */

/**@brief  Function for initializing the UART module.
 */
/**@snippet [UART Initialization] */
static rt_bool_t _stack_init(void)
{
    uint32_t err_code;

    stack_event = rt_event_create("stackev", RT_IPC_FLAG_FIFO);
    sd_evt_sem = rt_sem_create("sdsem", 0, RT_IPC_FLAG_FIFO);
    stack_evt_mq = rt_mq_create("stackmq", BLE_STACK_EVT_MSG_BUF_SIZE, STACK_EVT_MQ_NUM, RT_IPC_FLAG_FIFO);
    evt_sample = rt_malloc(BLE_STACK_EVT_MSG_BUF_SIZE);

    if (!stack_event || !sd_evt_sem || !stack_evt_mq || !evt_sample)
    {
        rt_kprintf("uart rx sem create failure\n");
        return RT_FALSE;
    }

    // Initialize.
    err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);

    ble_stack_init();
    gap_params_init();
    gatt_init();
    services_init();
    advertising_init();
    conn_params_init();

    return RT_TRUE;
}

/**@brief Application main function.
 */
static void _stack_thread(void *parameter)
{
    rt_tick_t next_timeout = (rt_tick_t)RT_WAITING_FOREVER;
    
    FAST_ADV();
    // Enter main loop.
    for (;;)
    {
        rt_uint32_t event = 0;
        rt_tick_t dispatch_timeout = RT_WAITING_NO;

        rt_event_recv(stack_event, STACK_EV_DISCON | STACK_EV_DISPATCH | STACK_EV_KEY,
                    RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR, next_timeout, &event);

        if (evt_dispatch_worker() != RT_EOK)
        {
            dispatch_timeout = (rt_tick_t)RT_WAITING_FOREVER;
        }

        if (event & STACK_EV_DISCON)
        {
            if (BLE_CONN_HANDLE_INVALID != m_conn_handle)
            {
                sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            }
        }

        if (event & STACK_EV_KEY)
        {
            if (stack_state != STACK_STATE_CON && stack_state != STACK_STATE_ADV)
            {
                FAST_ADV();
            }
        }

        next_timeout = (rt_tick_t)RT_WAITING_FOREVER;

        if (dispatch_timeout < next_timeout)
        {
            next_timeout = dispatch_timeout;
        }
    }
}

static void _softdevice_thread(void* parameter)
{
    for (;;)
    {
        rt_sem_take(sd_evt_sem, RT_WAITING_FOREVER);
        intern_softdevice_events_execute();
    }
}

rt_err_t ble_init(void)
{
    rt_thread_t thread;

    _stack_init();

    thread = rt_thread_create("sdth", _softdevice_thread, RT_NULL, 512, 0, 10);

    if (thread != RT_NULL)
    {
        rt_thread_startup(thread);
    }
    else
    {
        return RT_ERROR;
    }

    thread = rt_thread_create("bleth", _stack_thread, RT_NULL, 2048, 1, 10);

    if (thread != RT_NULL)
    {
        return rt_thread_startup(thread);
    }

    return RT_ERROR;
}