[嵌入式][nrf51822][SDK12.3] 实现白名单快速广播3s，转白名单慢广播无限

实现白名单快速广播3s，转白名单慢广播无限
1. 白名单机制

• 白名单（white list）是BLE协议中最简单、直白的一种安全机制。
• 所谓的白名单，就是一组蓝牙地址。
• 通过白名单，可以只允许特定的蓝牙设备（白名单中列出的）扫描（Scan）、连接（connect）我们。
• 也可以只扫描、连接特定的蓝牙设备（白名单中列出的）。

#define APP_ADV_FAST_INTERVAL 0x0028    /**< Fast advertising interval (in units of 0.625 ms. This value corresponds to 25 ms.). */
#define APP_ADV_SLOW_INTERVAL 0x0C80    /**< Slow advertising interval (in units of 0.625 ms. This value corrsponds to 2 seconds). */

#define APP_ADV_FAST_TIMEOUT 3  /**< The duration of the fast advertising period (in seconds). */
#define APP_ADV_SLOW_TIMEOUT 0  /**< The duration of the slow advertising period (in seconds). */

static void advertising_init(void)
{
    uint32_t               err_code;
    uint8_t                adv_flags;
    ble_advdata_t          advdata;
    ble_adv_modes_config_t options;

    // Build and set advertising data
    memset(&advdata, 0, sizeof(advdata));

    adv_flags                       = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;//重点
    advdata.name_type               = BLE_ADVDATA_FULL_NAME;
    advdata.include_appearance      = true;
    advdata.flags                   = adv_flags;
    advdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    advdata.uuids_complete.p_uuids  = m_adv_uuids;

    memset(&options, 0, sizeof(options));
    options.ble_adv_whitelist_enabled      = true;//重点
    options.ble_adv_directed_enabled       = true;
    options.ble_adv_directed_slow_enabled  = false;
    options.ble_adv_directed_slow_interval = 0;
    options.ble_adv_directed_slow_timeout  = 0;
    options.ble_adv_fast_enabled           = true;
    options.ble_adv_fast_interval          = APP_ADV_FAST_INTERVAL;
    options.ble_adv_fast_timeout           = APP_ADV_FAST_TIMEOUT;
    options.ble_adv_slow_enabled           = true;
    options.ble_adv_slow_interval          = APP_ADV_SLOW_INTERVAL;
    options.ble_adv_slow_timeout           = APP_ADV_SLOW_TIMEOUT;

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

注：不允许使用[ble_advertising_restart_without_whitelist]，不然会终止白名单广播，转为普通广播