步驟 2：建立並執行作業 AWS IoT

選取要儲存任務文件的 Amazon S3 儲存貯體。如果沒有可使用的現有 Amazon S3 儲存貯體，就需要建立一個。如需如何建立 Amazon S3 儲存貯體的詳細資訊，請參閱 Amazon S3 入門中的主題。

建立並儲存此任務的任務文件

1. 在本機主機電腦上，開啟文字編輯器。

2. 將此文字複製並貼入編輯器中。

   {
       "operation": "echo",
       "args": ["Hello world!"]
   }

3. 在本機主機電腦上，將編輯器的內容儲存至名為 hello-world-job.json 的檔案。

4. 請確認檔案已正確儲存。某些文字編輯器會在儲存文字檔案時自動附加 .txt 至檔案名稱。如果編輯器附加了 .txt 至檔案名稱，請更正檔案名稱後再繼續。

更換 path_to_file 使用路徑hello-world-job.json，如果它不在當前目錄中，請替換 s3_bucket_name 使用 Amazon S3 儲存貯體路徑到您選取的儲存貯體，然後執行此命令將您的任務文件放入 Amazon S3 儲存貯體。

aws s3api put-object \
--key hello-world-job.json \
--body path_to_file/hello-world-job.json --bucket s3_bucket_name

識別您存放在 Amazon S3 中的任務文件的任務文件是透過取代 URL s3_bucket_name 以及 AWS_region 在下面URL。記錄產生的結果，URL以便稍後使用 job_document_path

https://s3_bucket_name.s3.AWS_Region.amazonaws.com/hello-world-job.json

在連接到 Raspberry Pi 的本機主機電腦上的終端機視窗中，執行此命令以啟動 AWS IoT 裝置用戶端。

cd ~/aws-iot-device-client/build
./aws-iot-device-client --config-file ~/dc-configs/dc-jobs-config.json

在終端機視窗中，確認 AWS IoT 設備客戶端並顯示這些消息

2021-11-15T18:45:56.708Z [INFO]  {Main.cpp}: Jobs is enabled
                      .
                      .
                      .
2021-11-15T18:45:56.708Z [INFO]  {Main.cpp}: Client base has been notified that Jobs has started
2021-11-15T18:45:56.708Z [INFO]  {JobsFeature.cpp}: Running Jobs!
2021-11-15T18:45:56.708Z [DEBUG] {JobsFeature.cpp}: Attempting to subscribe to startNextPendingJobExecution accepted and rejected
2021-11-15T18:45:56.708Z [DEBUG] {JobsFeature.cpp}: Attempting to subscribe to nextJobChanged events
2021-11-15T18:45:56.708Z [DEBUG] {JobsFeature.cpp}: Attempting to subscribe to updateJobExecutionStatusAccepted for jobId +
2021-11-15T18:45:56.738Z [DEBUG] {JobsFeature.cpp}: Ack received for SubscribeToUpdateJobExecutionAccepted with code {0}
2021-11-15T18:45:56.739Z [DEBUG] {JobsFeature.cpp}: Attempting to subscribe to updateJobExecutionStatusRejected for jobId +
2021-11-15T18:45:56.753Z [DEBUG] {JobsFeature.cpp}: Ack received for SubscribeToNextJobChanged with code {0}
2021-11-15T18:45:56.760Z [DEBUG] {JobsFeature.cpp}: Ack received for SubscribeToStartNextJobRejected with code {0}
2021-11-15T18:45:56.776Z [DEBUG] {JobsFeature.cpp}: Ack received for SubscribeToStartNextJobAccepted with code {0}
2021-11-15T18:45:56.776Z [DEBUG] {JobsFeature.cpp}: Ack received for SubscribeToUpdateJobExecutionRejected with code {0}
2021-11-15T18:45:56.777Z [DEBUG] {JobsFeature.cpp}: Publishing startNextPendingJobExecutionRequest
2021-11-15T18:45:56.785Z [DEBUG] {JobsFeature.cpp}: Ack received for StartNextPendingJobPub with code {0}
2021-11-15T18:45:56.785Z [INFO]  {JobsFeature.cpp}: No pending jobs are scheduled, waiting for the next incoming job

在終端機視窗中看到此訊息之後，請繼續執行下一個程序並建立任務資源。請注意，它可能不是清單中的最後一個項目。

2021-11-15T18:45:56.785Z [INFO]  {JobsFeature.cpp}: No pending jobs are scheduled, waiting for the next incoming job

在本機主機電腦上：

1. Replace (取代) job_document_url 與來自的工作文URL件建立並存放任務的任務文件。

2. Replace (取代) thing_arn 使用您為設備創建ARN的事物資源，然後運行此命令。

   aws iot create-job \
   --job-id hello-world-job-1 \
   --document-source "job_document_url" \
   --targets "thing_arn" \
   --target-selection SNAPSHOT

   如果成功，命令會傳回類似以下的結果。

   {
     "jobArn": "arn:aws:iot:us-west-2:57EXAMPLE833:job/hello-world-job-1",
     "jobId": "hello-world-job-1"
   }

在終端窗口中，您應該看到 AWS IoT 像這樣的設備客戶端。

2021-11-15T18:02:26.688Z [INFO]  {JobsFeature.cpp}: No pending jobs are scheduled, waiting for the next incoming job
2021-11-15T18:10:24.890Z [DEBUG] {JobsFeature.cpp}: Job ids differ
2021-11-15T18:10:24.890Z [INFO]  {JobsFeature.cpp}: Executing job: hello-world-job-1
2021-11-15T18:10:24.890Z [DEBUG] {JobsFeature.cpp}: Attempting to update job execution status!
2021-11-15T18:10:24.890Z [DEBUG] {JobsFeature.cpp}: Not including stdout with the status details
2021-11-15T18:10:24.890Z [DEBUG] {JobsFeature.cpp}: Not including stderr with the status details
2021-11-15T18:10:24.890Z [DEBUG] {JobsFeature.cpp}: Assuming executable is in PATH
2021-11-15T18:10:24.890Z [INFO]  {JobsFeature.cpp}: About to execute: echo Hello world!
2021-11-15T18:10:24.890Z [DEBUG] {Retry.cpp}: Retryable function starting, it will retry until success
2021-11-15T18:10:24.890Z [DEBUG] {JobsFeature.cpp}: Created EphermalPromise for ClientToken 3TEWba9Xj6 in the updateJobExecution promises map
2021-11-15T18:10:24.890Z [DEBUG] {JobEngine.cpp}: Child process now running
2021-11-15T18:10:24.890Z [DEBUG] {JobEngine.cpp}: Child process about to call execvp
2021-11-15T18:10:24.890Z [DEBUG] {JobEngine.cpp}: Parent process now running, child PID is 16737
2021-11-15T18:10:24.891Z [DEBUG] {16737}: Hello world!
2021-11-15T18:10:24.891Z [DEBUG] {JobEngine.cpp}: JobEngine finished waiting for child process, returning 0
2021-11-15T18:10:24.891Z [INFO]  {JobsFeature.cpp}: Job exited with status: 0
2021-11-15T18:10:24.891Z [INFO]  {JobsFeature.cpp}: Job executed successfully!
2021-11-15T18:10:24.891Z [DEBUG] {JobsFeature.cpp}: Attempting to update job execution status!
2021-11-15T18:10:24.891Z [DEBUG] {JobsFeature.cpp}: Not including stdout with the status details
2021-11-15T18:10:24.891Z [DEBUG] {JobsFeature.cpp}: Not including stderr with the status details
2021-11-15T18:10:24.892Z [DEBUG] {Retry.cpp}: Retryable function starting, it will retry until success
2021-11-15T18:10:24.892Z [DEBUG] {JobsFeature.cpp}: Created EphermalPromise for ClientToken GmQ0HTzWGg in the updateJobExecution promises map
2021-11-15T18:10:24.905Z [DEBUG] {JobsFeature.cpp}: Ack received for PublishUpdateJobExecutionStatus with code {0}
2021-11-15T18:10:24.905Z [DEBUG] {JobsFeature.cpp}: Removing ClientToken 3TEWba9Xj6 from the updateJobExecution promises map
2021-11-15T18:10:24.905Z [DEBUG] {JobsFeature.cpp}: Success response after UpdateJobExecution for job hello-world-job-1
2021-11-15T18:10:24.917Z [DEBUG] {JobsFeature.cpp}: Ack received for PublishUpdateJobExecutionStatus with code {0}
2021-11-15T18:10:24.918Z [DEBUG] {JobsFeature.cpp}: Removing ClientToken GmQ0HTzWGg from the updateJobExecution promises map
2021-11-15T18:10:24.918Z [DEBUG] {JobsFeature.cpp}: Success response after UpdateJobExecution for job hello-world-job-1
2021-11-15T18:10:25.861Z [INFO]  {JobsFeature.cpp}: No pending jobs are scheduled, waiting for the next incoming job

雖然 AWS IoT 裝置用戶端正在執行並等待工作，您可以透過變更job-id值並create-job從步驟 1 重新執行來提交另一個工作。