[参考译文] CC3220SF-LAUNCHXL：从服务器(CC3220SF)到客户端(任何其他设备)的 HTTP 消息传输中的碎片

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https://e2e.ti.com/support/wireless-connectivity/wi-fi-group/wifi/f/wi-fi-forum/1123532/cc3220sf-launchxl-fragmentation-in-http-message-transfer-from-server-cc3220sf-to-client-any-other-device

器件型号：CC3220SF-LAUNCHXL
主题中讨论的其他器件：CC3220SF

您好！

我正在尝试将 http 消息从 CC3220SF HTTP 服务器发送到基于笔记本电脑的 http 客户端、其中 CC3220SF 也用作接入点。我必须发送大量数据(大约10KB)来响应每个 http 请求。我尝试发送2kB、每个大小为500B (总共为2kB)的4个片段、这种情况很好、代码如下所示：

int32_t dataGetCallback(uint8_t requestIdx, uint8_t *argcCallback, uint8_t **argvCallback, SlNetAppRequest_t *netAppRequest)
{
    uint8_t *pPayload;
    uint16_t metadataLen, sendDatalen;



    char sendDataStr1[500] = "1Machine learning (ML) is a field of inquiry devoted to understanding and building methods that 'learn', that is, methods that leverage data to improve performance on some set of tasks. It is seen as a part of artificial intelligence. Machine learning algorithms build a model based on sample data, known as training data, in order to make predictions or decisions without being explicitly programmed to do so1.";
    char sendDataStr2[500] = "2Machine learning (ML) is a field of inquiry devoted to understanding and building methods that 'learn', that is, methods that leverage data to improve performance on some set of tasks. It is seen as a part of artificial intelligence. Machine learning algorithms build a model based on sample data, known as training data, in order to make predictions or decisions without being explicitly programmed to do so2.";
    char sendDataStr3[500] = "3Machine learning (ML) is a field of inquiry devoted to understanding and building methods that 'learn', that is, methods that leverage data to improve performance on some set of tasks. It is seen as a part of artificial intelligence. Machine learning algorithms build a model based on sample data, known as training data, in order to make predictions or decisions without being explicitly programmed to do so3.";
    char sendDataStr4[500] = "4Machine learning (ML) is a field of inquiry devoted to understanding and building methods that 'learn', that is, methods that leverage data to improve performance on some set of tasks. It is seen as a part of artificial intelligence. Machine learning algorithms build a model based on sample data, known as training data, in order to make predictions or decisions without being explicitly programmed to do so4.";
    char sendDataStr5[500] = "4Machine learning (ML) is a field of inquiry devoted to understanding and building methods that 'learn', that is, methods that leverage data to improve performance on some set of tasks. It is seen as a part of artificial intelligence. Machine learning algorithms build a model based on sample data, known as training data, in order to make predictions or decisions without being explicitly programmed to do so5.";

    pPayload = gPayloadBuffer;



    sl_Memcpy (pPayload, sendDataStr1, sizeof(sendDataStr1));
    pPayload += sizeof(sendDataStr1);

    /* NULL terminate the payload */
    *(pPayload) = '\0';

    sendDatalen = sizeof(sendDataStr1) + sizeof(sendDataStr2) + sizeof(sendDataStr3)+ sizeof(sendDataStr4); //+sizeof(sendDataStr5);

    metadataLen = prepareGetMetadata(0, sendDatalen, HttpContentTypeList_TextPlain);

    pthread_mutex_lock(&spiMutex);

    sl_NetAppSend (netAppRequest->Handle, metadataLen, gMetadataBuffer, (SL_NETAPP_REQUEST_RESPONSE_FLAGS_CONTINUATION | SL_NETAPP_REQUEST_RESPONSE_FLAGS_METADATA));
    sl_NetAppSend (netAppRequest->Handle,sizeof(sendDataStr1), gPayloadBuffer, SL_NETAPP_REQUEST_RESPONSE_FLAGS_CONTINUATION); /* mark as last segment */


    pPayload = gPayloadBuffer;
    sl_Memcpy (pPayload, sendDataStr2, sizeof(sendDataStr2));
    pPayload += sizeof(sendDataStr2);

    /* NULL terminate the payload */
    *(pPayload) = '\0';

    sl_NetAppSend (netAppRequest->Handle,sizeof(sendDataStr3), gPayloadBuffer, SL_NETAPP_REQUEST_RESPONSE_FLAGS_CONTINUATION); /* mark as last segment */

    pPayload = gPayloadBuffer;
    sl_Memcpy (pPayload, sendDataStr3, sizeof(sendDataStr3));
    pPayload += sizeof(sendDataStr3);

    /* NULL terminate the payload */
    *(pPayload) = '\0';

   sl_NetAppSend (netAppRequest->Handle,sizeof(sendDataStr3), gPayloadBuffer, SL_NETAPP_REQUEST_RESPONSE_FLAGS_CONTINUATION); /* mark as last segment */

    pPayload = gPayloadBuffer;
    sl_Memcpy (pPayload, sendDataStr4, sizeof(sendDataStr4));
    pPayload += sizeof(sendDataStr4);

    /* NULL terminate the payload */
    *(pPayload) = '\0';

    sl_NetAppSend (netAppRequest->Handle,sizeof(sendDataStr4), gPayloadBuffer, 0); /* mark as last segment */

    pthread_mutex_unlock(&spiMutex);

    return 0;
}

答案如下：

但是、当我尝试发送更多的片段或/和四个较大尺寸的片段时、它只能作为请求、然后显示404错误、如下所示-

int32_t dataGetCallback(uint8_t requestIdx, uint8_t *argcCallback, uint8_t **argvCallback, SlNetAppRequest_t *netAppRequest)
{
    uint8_t *pPayload;
    uint16_t metadataLen, sendDatalen;



    char sendDataStr1[500] = "1Machine learning (ML) is a field of inquiry devoted to understanding and building methods that 'learn', that is, methods that leverage data to improve performance on some set of tasks. It is seen as a part of artificial intelligence. Machine learning algorithms build a model based on sample data, known as training data, in order to make predictions or decisions without being explicitly programmed to do so1.";
    char sendDataStr2[500] = "2Machine learning (ML) is a field of inquiry devoted to understanding and building methods that 'learn', that is, methods that leverage data to improve performance on some set of tasks. It is seen as a part of artificial intelligence. Machine learning algorithms build a model based on sample data, known as training data, in order to make predictions or decisions without being explicitly programmed to do so2.";
    char sendDataStr3[500] = "3Machine learning (ML) is a field of inquiry devoted to understanding and building methods that 'learn', that is, methods that leverage data to improve performance on some set of tasks. It is seen as a part of artificial intelligence. Machine learning algorithms build a model based on sample data, known as training data, in order to make predictions or decisions without being explicitly programmed to do so3.";
    char sendDataStr4[500] = "4Machine learning (ML) is a field of inquiry devoted to understanding and building methods that 'learn', that is, methods that leverage data to improve performance on some set of tasks. It is seen as a part of artificial intelligence. Machine learning algorithms build a model based on sample data, known as training data, in order to make predictions or decisions without being explicitly programmed to do so4.";
    char sendDataStr5[500] = "4Machine learning (ML) is a field of inquiry devoted to understanding and building methods that 'learn', that is, methods that leverage data to improve performance on some set of tasks. It is seen as a part of artificial intelligence. Machine learning algorithms build a model based on sample data, known as training data, in order to make predictions or decisions without being explicitly programmed to do so5.";

    pPayload = gPayloadBuffer;



    sl_Memcpy (pPayload, sendDataStr1, sizeof(sendDataStr1));
    pPayload += sizeof(sendDataStr1);

//    /* NULL terminate the payload */
    *(pPayload) = '\0';

    sendDatalen = sizeof(sendDataStr1) + sizeof(sendDataStr2) + sizeof(sendDataStr3)+ sizeof(sendDataStr4)+sizeof(sendDataStr5);

    metadataLen = prepareGetMetadata(0, sendDatalen, HttpContentTypeList_TextPlain);

    pthread_mutex_lock(&spiMutex);

    sl_NetAppSend (netAppRequest->Handle, metadataLen, gMetadataBuffer, (SL_NETAPP_REQUEST_RESPONSE_FLAGS_CONTINUATION | SL_NETAPP_REQUEST_RESPONSE_FLAGS_METADATA));
    sl_NetAppSend (netAppRequest->Handle,sizeof(sendDataStr1), gPayloadBuffer, SL_NETAPP_REQUEST_RESPONSE_FLAGS_CONTINUATION); /* mark as last segment */


    pPayload = gPayloadBuffer;
    sl_Memcpy (pPayload, sendDataStr2, sizeof(sendDataStr2));
    pPayload += sizeof(sendDataStr2);

//    /* NULL terminate the payload */
    *(pPayload) = '\0';

    sl_NetAppSend (netAppRequest->Handle,sizeof(sendDataStr3), gPayloadBuffer, SL_NETAPP_REQUEST_RESPONSE_FLAGS_CONTINUATION); /* mark as last segment */

    pPayload = gPayloadBuffer;
    sl_Memcpy (pPayload, sendDataStr3, sizeof(sendDataStr3));
    pPayload += sizeof(sendDataStr3);

//    /* NULL terminate the payload */
    *(pPayload) = '\0';

   sl_NetAppSend (netAppRequest->Handle,sizeof(sendDataStr3), gPayloadBuffer, SL_NETAPP_REQUEST_RESPONSE_FLAGS_CONTINUATION); /* mark as last segment */

    pPayload = gPayloadBuffer;
    sl_Memcpy (pPayload, sendDataStr4, sizeof(sendDataStr4));
    pPayload += sizeof(sendDataStr4);

////    /* NULL terminate the payload */
    *(pPayload) = '\0';

    sl_NetAppSend (netAppRequest->Handle,sizeof(sendDataStr4), gPayloadBuffer, SL_NETAPP_REQUEST_RESPONSE_FLAGS_CONTINUATION); /* mark as last segment */

     pPayload = gPayloadBuffer;
     sl_Memcpy (pPayload, sendDataStr5, sizeof(sendDataStr5));
     pPayload += sizeof(sendDataStr5);

 ////    /* NULL terminate the payload */
     *(pPayload) = '\0';

    sl_NetAppSend (netAppRequest->Handle,sizeof(sendDataStr5), gPayloadBuffer, 0); /* mark as last segment */

    pthread_mutex_unlock(&spiMutex);

    return 0;
}

Postman 中客户机的响应如下所示(html 页面中出现相同的响应)--