将设备twin属性从azure iot central发送到设备

我正在尝试将Stm32 discovery kit物联网节点连接到Azure物联网中心

我在IoT Central中创建了一个设备模板和设备，并创建了一个连接字符串

使用虚拟设备，我验证了我可以发送数据正常。。。但开发板无法连接。。看起来它正在等待IoT central向其发送内容以更新设备或所需属性……但我不知道如何通过Azure IoT central做到这一点。我尝试在“属性”选项卡上更改属性并保存它，但什么都没有发生……我如何才能将内容从IoT Central发送到我的设备

设置其等待的标志的回调函数位于（由STM写入）其等待的标志为ReceivedDeviceWinProperty的下方

**
 * @brief CallBack received at the beginning on when there is a change on desired properties
 * @param DEVICE_TWIN_UPDATE_STATE status_code Status received
 * @param unsigned char* payload Payload received (json)
 * @param size_t size size of the Payload received
 * @param void* userContextCallback pointer to the model instance
 * @retval None
 */
static void DeviceTwinCallbackStatus(DEVICE_TWIN_UPDATE_STATE status_code,  const unsigned char* payload, size_t size, void* userContextCallback)
{
  /* Only for Debug */
  AZURE_PRINTF("DeviceTwinCallbackStatus Method payload: %.*s\r\nStatus_code = %d\r\n", size,(const char*)payload,status_code); //sabol

  /* query the DeviceTwin Status */
  {
    JSON_DECODER_RESULT JSONDec;
    MULTITREE_HANDLE multiTreeHandle;
    char* temp = malloc(size + 1);
    if (temp == NULL) {
      AZURE_PRINTF("Err: failed to malloc\r\n");
      return;
    }
    /* We need to add the missing termination char */
    (void)memcpy(temp, payload, size);
    temp[size] = '\0';
    if((JSONDec = JSONDecoder_JSON_To_MultiTree(temp,&multiTreeHandle))!=JSON_DECODER_OK) {
      AZURE_PRINTF("Err: Decoding JSON Code=%d\r\n",JSONDec);
      free(temp);
      return;
    } else {
      AZURE_PRINTF("JSON Decoded\r\n");
    }

    /* Search the Reported Properties Only at the beginning */
    if(ReceivedDeviceTwinProperty==0){
      MULTITREE_HANDLE childHandle;
      ReceivedDeviceTwinProperty=1;
      if(MultiTree_GetChildByName(multiTreeHandle, "reported", &childHandle)== MULTITREE_OK) {
        MULTITREE_HANDLE childHandle2;
        AZURE_PRINTF("Reported Property Found\r\n");
        if(MultiTree_GetChildByName(childHandle, "AzureStatus", &childHandle2) != MULTITREE_OK) {
          AZURE_PRINTF("AzureStatus Reported Property not Found\r\n");
        } else {
          void const *ResultStatus;
          //AZURE_PRINTF("AzureStatus reported Property Found\r\n");
          if(MultiTree_GetValue(childHandle2, &ResultStatus)!= MULTITREE_OK) {
            AZURE_PRINTF("Err: Reading the AzureStatus Reported Property value\r\n");
          } else {
            //AZURE_PRINTF("AzureStatus reported Property value=%s\r\n",(unsigned char *)ResultStatus);
            /* We need to avoid to check the \" because the property is "Applying"  or "Downloading" */
            if(!strncmp(ENUM_TO_STRING(FIRMWARE_UPDATE_STATUS,Applying),((char *)ResultStatus)+1,strlen(ENUM_TO_STRING(FIRMWARE_UPDATE_STATUS,Applying))-1)) {
              /* This for cleanning the Supported Methods/Commands list */
              Azure1->SupportedMethods = "null";
              Azure1->SupportedCommands = "null";
              ReportState(ApplyComplete);
            } else if (!strncmp(ENUM_TO_STRING(FIRMWARE_UPDATE_STATUS,Downloading),((char *)ResultStatus)+1,strlen(ENUM_TO_STRING(FIRMWARE_UPDATE_STATUS,Downloading))-1)) {
              ReportState(DownloadFailed);
            }
          }
        }
      }
      /* Check also the Desired Properties */
      if(MultiTree_GetChildByName(multiTreeHandle, "desired", &childHandle)== MULTITREE_OK) {
        MULTITREE_HANDLE childHandle2;
#ifdef AZURE_IOT_CENTRAL
        MULTITREE_HANDLE childHandleVersion;
#endif /* AZURE_IOT_CENTRAL */
        AZURE_PRINTF("Desired Property Found\r\n");

        /* Search the Version Number */
#ifdef AZURE_IOT_CENTRAL
         if(MultiTree_GetChildByName(childHandle, "$version", &childHandleVersion) != MULTITREE_OK) {
          AZURE_PRINTF("$version Desired Property not Found\r\n");
        } else {
           void const *ResultInterval;
           if(MultiTree_GetValue(childHandleVersion, &ResultInterval)!= MULTITREE_OK) {
            AZURE_PRINTF("Err: Reading the $version Desired Property value\r\n");
          } else {
            DesiredVersion = atoi((char *) ResultInterval);
            AZURE_PRINTF("Desired property $version= %d\r\n",DesiredVersion);
          }
        }
#endif /* AZURE_IOT_CENTRAL */

        if(MultiTree_GetChildByName(childHandle, "DesiredTelemetryInterval", &childHandle2) != MULTITREE_OK) {
          AZURE_PRINTF("DesiredTelemetryInterval Desired Property not Found\r\n");
        } else {
          void const *ResultInterval;
          //AZURE_PRINTF("DesiredTelemetryInterval Desired Property Found\r\n");
#ifndef AZURE_IOT_CENTRAL
          if(MultiTree_GetValue(childHandle2, &ResultInterval)!= MULTITREE_OK) {
            AZURE_PRINTF("Err: Reading the DesiredTelemetryInterval Desired Property value\r\n");
          } else {
            Azure1_t *Azure = userContextCallback;
            Azure->DesiredTelemetryInterval= atoi(((char *) ResultInterval));
            AZURE_PRINTF("Desired Telemetry Interval= %d\r\n", Azure->DesiredTelemetryInterval);
            ChangeTelemetryInterval(userContextCallback);
          }
#else /* AZURE_IOT_CENTRAL */
          MULTITREE_HANDLE childHandle3;
          if(MultiTree_GetChildByName(childHandle2, "value", &childHandle3) != MULTITREE_OK) {
            AZURE_PRINTF("value for Desired  DesiredTelemetryInterval Property not Found\r\n");
          } else {
            if(MultiTree_GetValue(childHandle3, &ResultInterval)!= MULTITREE_OK) {
              AZURE_PRINTF("Err: Reading the DesiredTelemetryInterval Desired Property value\r\n");
            } else {
              Azure1_t *Azure = userContextCallback;
              DesiredTelemetryInterval= atoi(((char *) ResultInterval));
              AZURE_PRINTF("Desired Telemetry Interval= %d\r\n", DesiredTelemetryInterval);
              ChangeTelemetryInterval(userContextCallback);
            }
          }
#endif /* AZURE_IOT_CENTRAL */
        }
#ifndef USE_STM32L475E_IOT01
        if(MultiTree_GetChildByName(childHandle, "DesiredHWMode", &childHandle2) != MULTITREE_OK) {
          AZURE_PRINTF("DesiredHWMode Desired Property not Found\r\n");
        } else {
          void const *ResultHWMode;
          //AZURE_PRINTF("DesiredHWMode Desired Property Found\r\n");
          if(MultiTree_GetValue(childHandle2, &ResultHWMode)!= MULTITREE_OK) {
            AZURE_PRINTF("Err: Reading the DesiredHWMode Desired Property value\r\n");
          } else {
            Azure1_t *Azure = userContextCallback;
            Azure->DesiredHWMode= atoi(((char *) ResultHWMode));
            AZURE_PRINTF("Desired HW Mode= %d\r\n", Azure->DesiredHWMode);
            ChangeHWMode(userContextCallback);
          }
        }
#endif /* USE_STM32L475E_IOT01 */
      }
    } else {
      /* if we are not at the beginning... there is a change on the Desided properties */
        /* Search the Version Number */
#ifdef AZURE_IOT_CENTRAL
        MULTITREE_HANDLE childHandleVersion;
         if(MultiTree_GetChildByName(multiTreeHandle, "$version", &childHandleVersion) != MULTITREE_OK) {
          AZURE_PRINTF("$version Desired Property not Found\r\n");
        } else {
           void const *ResultInterval;
           if(MultiTree_GetValue(childHandleVersion, &ResultInterval)!= MULTITREE_OK) {
            AZURE_PRINTF("Err: Reading the $version Desired Property value\r\n");
          } else {
            DesiredVersion = atoi((char *) ResultInterval);
            AZURE_PRINTF("Desired property $version= %d\r\n",DesiredVersion);
          }
        }
#endif /* AZURE_IOT_CENTRAL */

      MULTITREE_HANDLE childHandle;
      if(MultiTree_GetChildByName(multiTreeHandle, "DesiredTelemetryInterval", &childHandle) != MULTITREE_OK) {
        AZURE_PRINTF("DesiredTelemetryInterval Desired Property not Found\r\n");
      } else {
        void const *ResultInterval;
#ifndef AZURE_IOT_CENTRAL
          if(MultiTree_GetValue(childHandle, &ResultInterval)!= MULTITREE_OK) {
            AZURE_PRINTF("Err: Reading the DesiredTelemetryInterval Desired Property value\r\n");
          } else {
            Azure1_t *Azure = userContextCallback;
            Azure->DesiredTelemetryInterval= atoi(((char *) ResultInterval));
            AZURE_PRINTF("Desired Telemetry Interval= %d\r\n", Azure->DesiredTelemetryInterval);
            ChangeTelemetryInterval(userContextCallback);
          }
#else /* AZURE_IOT_CENTRAL */
          MULTITREE_HANDLE childHandle2;
          if(MultiTree_GetChildByName(childHandle, "value", &childHandle2) != MULTITREE_OK) {
            AZURE_PRINTF("value for Desired  DesiredTelemetryInterval Property not Found\r\n");
          } else {
            if(MultiTree_GetValue(childHandle2, &ResultInterval)!= MULTITREE_OK) {
              AZURE_PRINTF("Err: Reading the DesiredTelemetryInterval Desired Property value\r\n");
            } else {
              Azure1_t *Azure = userContextCallback;
              DesiredTelemetryInterval= atoi(((char *) ResultInterval));
              AZURE_PRINTF("Desired Telemetry Interval= %d\r\n", DesiredTelemetryInterval);
              ChangeTelemetryInterval(userContextCallback);
            }
          }
#endif /* AZURE_IOT_CENTRAL */
      }
#ifndef USE_STM32L475E_IOT01
      if(MultiTree_GetChildByName(multiTreeHandle, "DesiredHWMode", &childHandle) != MULTITREE_OK) {
        AZURE_PRINTF("DesiredHWMode Desired Property not Found\r\n");
      } else {
        void const *ResultHWMode;
        if(MultiTree_GetValue(childHandle, &ResultHWMode)!= MULTITREE_OK) {
          AZURE_PRINTF("Err: Reading the DesiredHWMode Desired Property value\r\n");
        } else {
          Azure1_t *Azure = userContextCallback;
          Azure->DesiredHWMode= atoi(((char *) ResultHWMode));
          AZURE_PRINTF("Desired HW Mode= %d\r\n", Azure->DesiredHWMode);
          ChangeHWMode(userContextCallback);
        }
      }
#endif /* USE_STM32L475E_IOT01 */
    }
    MultiTree_Destroy(multiTreeHandle);
    free(temp);
  }
}

---

我想你可能找错地方了。物联网中央用户界面中的“云”属性是可以编辑的，但不会被推回到设备上。您应该将它们视为元数据，仅从云/非边缘的角度考虑。 如果您想通过设备twin“推送”属性，可以通过物联网中心设置的概念