nordic sdk通过GATT连接到手机,接收到手机的数据包后,把这个数据包广播发出去.请问怎么实现

Nordic SDK提供了一个名为 "ble\_nus" 的例子，可以将收到的数据包广播回去。您可以通过以下步骤实现：

1. 使用Nordic SDK中的SoftDevice配置蓝牙连接和广播。

2. 在您的应用程序中实现GATT客户端来接收手机的数据包。

3. 将接收到的数据包发送到名为 "ble\_nus" 的Nordic UART服务。

4. 在"ble\_nus"服务上注册一个事件处理程序，当数据包到达时，将其广播回去。

以下是大致代码示例：

// 1. 配置蓝牙连接和广播
void ble_stack_init(void)
{
    uint32_t err_code;

    // Initialize the SoftDevice handler module.
    SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, false);

    // Enable BLE stack
    ble_enable_params_t ble_enable_params;
    memset(&ble_enable_params, 0, sizeof(ble_enable_params));
    ble_enable_params.gatts_enable_params.service_changed = IS_SRVC_CHANGED_CHARACT_PRESENT;
    err_code = sd_ble_enable(&ble_enable_params);
    APP_ERROR_CHECK(err_code);

    // Configure device name
    err_code = sd_ble_gap_device_name_set(&sec_mode, (const uint8_t *)DEVICE_NAME, strlen(DEVICE_NAME));
    APP_ERROR_CHECK(err_code);

    // Configure advertising parameters
    ble_advdata_t advdata;
    memset(&advdata, 0, sizeof(advdata));
    advdata.name_type               = BLE_ADVDATA_FULL_NAME;
    advdata.include_appearance      = true;
    advdata.flags                   = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;

    ble_advdata_t scanrsp;
    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;

    ble_gap_adv_params_t adv_params;
    memset(&adv_params, 0, sizeof(adv_params));
    adv_params.type        = BLE_GAP_ADV_TYPE_ADV_IND;
    adv_params.p_peer_addr = NULL;
    adv_params.fp          = BLE_GAP_ADV_FP_ANY;
    adv_params.interval    = APP_ADV_INTERVAL;
    adv_params.timeout     = APP_ADV_TIMEOUT_IN_SECONDS;
    err_code = sd_ble_gap_adv_set_configure(&adv_handle, &advdata, &scanrsp, &adv_params);
    APP_ERROR_CHECK(err_code);

    // Start advertising
    err_code = sd_ble_gap_adv_start(adv_handle, APP_BLE_CONN_CFG_TAG);
    APP_ERROR_CHECK(err_code);
}

// 2. GATT客户端接收数据包
void on_data_received(uint8_t *data, uint16_t length)
{
    // Send data to Nordic UART service
    ble_nus_string_send(&m_nus, data, length);
}

// 3. 发送数据包到Nordic UART服务
void ble_nus_string_send(ble_nus_t * p_nus, uint8_t * p_string, uint16_t length)
{
    // Send data to Nordic UART service
    ble_gatts_hvx_params_t hvx_params;
    memset(&hvx_params, 0, sizeof(hvx_params));
    hvx_params.handle = p_nus->rx_handles.value_handle;
    hvx_params.type   = BLE_GATT_HVX_NOTIFICATION;
    hvx_params.offset = 0;
    hvx_params.p_len  = &length;
    hvx_params.p_data = p_string;

    uint32_t err_code = sd_ble_gatts_hvx(p_nus->conn_handle, &hvx_params);
    if ((err_code != NRF_SUCCESS) && (err_code != NRF_ERROR_INVALID_STATE) && (err_code != NRF_ERROR_RESOURCES) && (err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING))
    {
        APP_ERROR_HANDLER(err_code);
    }
}

// 4. Nordic UART服务上的事件处理程序
static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
    // Broadcast received data
    ble_gatts_hvx_params_t hvx_params;
    memset(&hvx_params, 0, sizeof(hvx_params));
    hvx_params.handle = p_nus->tx_handles.value_handle;
    hvx_params.type   = BLE_GATT_HVX_NOTIFICATION;
    hvx_params.offset = 0;
    hvx_params.p_len  = &length;
    hvx_params.p_data = p_data;

    uint32_t err_code = sd_ble_gatts_hvx(p_nus->conn_handle, &hvx_params);
    if ((err_code != NRF_SUCCESS) && (err_code != NRF_ERROR_INVALID_STATE) && (err_code != NRF_ERROR_RESOURCES))
    {
        APP_ERROR_HANDLER(err_code);
    }
}

请注意，以上代码只是提供了一个大致的框架，具体实现的细节可能会因为您的具体需求而有所不同。