本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

# 實作 OTA 代理程式
<a name="implement-ota-agent"></a>

當您從受管整合收到任務文件時，您必須實作自己的 OTA 代理程式，以處理任務文件、下載更新並執行任何安裝操作。OTA 代理程式需要執行下列步驟：

1. 韌體 Amazon S3 URLs剖析任務文件。

1. 透過 HTTP 下載韌體更新。

1. 驗證數位簽章。

1. 安裝已驗證的更新。

1. `iotmi\_JobsHandler\_updateJobStatus` 使用 `SUCCESS`或 `FAILED` 狀態呼叫 。

當您的裝置成功完成 OTA 操作時，必須呼叫狀態為 的 `iotmi\_JobsHandler\_updateJobStatus` API，`JobSucceeded`才能報告成功的任務。

```
/**
 * @brief Enumeration of possible job statuses.
 */
typedef enum{
    JobQueued,     /** The job is in the queue, waiting to be processed. */
    JobInProgress, /** The job is currently being processed. */
    JobFailed,     /** The job processing failed. */
    JobSucceeded,  /** The job processing succeeded. */
    JobRejected    /** The job was rejected, possibly due to an error or invalid request. */
} iotmi_JobCurrentStatus_t;

/**
 * @brief Update the status of a job with optional status details.
 *
 * @param[in] pJobId Pointer to the job ID string.
 * @param[in] jobIdLength Length of the job ID string.
 * @param[in] status The new status of the job.
 * @param[in] statusDetails Pointer to a string containing additional details about the job status.
 *                          This can be a JSON-formatted string or NULL if no details are needed.
 * @param[in] statusDetailsLength Length of the status details string. Set to 0 if `statusDetails` is NULL.
 *
 * @return 0 on success, non-zero on failure.
 */
int iotmi_JobsHandler_updateJobStatus( const char * pJobId,
                                        size_t jobIdLength,
                                        iotmi_JobCurrentStatus_t status,
                                        const char * statusDetails,
                                        size_t statusDetailsLength );
```