步骤 2：在 Amazon IoT中创建并运行任务

选择要将任务文档保存到的 Amazon S3 存储桶。如果您没有现有 Amazon S3 存储桶可用，需要创建一个。有关如何创建 Amazon S3 存储桶的信息，请参阅 Amazon S3 入门中的主题。

为此任务创建并保存任务文档

1. 在本地主机上，打开文本编辑器。

2. 复制此文本并粘贴到编辑器中。

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

3. 在本地主机上，将编辑器内容保存到名为 hello-world-job.json的文件中。

4. 确认文件已正确保存。一些文本编辑器会自动追加 .txt用户保存文本文件时的文件名。如果您的编辑器附加 .txt在文件名中，在继续之前更正文件名。

将 path_to_file 替换为到 hello-world-job.json的路径，如果不在当前目录中，将 s3_bucket_name 替换为所选存储桶的 Amazon S3 存储桶路径，然后运行此命令将您的任务文档放入 Amazon S3 存储桶中。

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

通过替换以下 URL 中的 s3_bucket_name and AWS_region，可以确定标识存储在 Amazon S3 中的任务文档的任务文档 URL。记录生成的 URL 稍后用作job_ocument_path

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

在连接到 Raspberry Pi 的本地主机上的终端窗口中，运行此命令启动 Amazon IoTDevice Client。

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

在终端窗口中，确认 Amazon IoTDevice Client 并显示这些消息

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

在终端窗口中，看到此消息后，继续下一步并创建任务资源。请注意，它可能不是列表中的最后一个条目。

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

在本地主机上：

1. 将 job_ocument_url 替换为 创建并存储任务的任务文档的任务文档 URL。

2. 将 thing_arn 替换为您为设备创建的事物资源的 ARN，然后运行此命令。

   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，该命令将返回类似此结果。

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

在终端窗口中，您应看到 Amazon IoTDevice Client 的输出 。

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

尽管 Amazon IoTDevice Client 正在运行并等待任务，您可以通过更改 job-id值并从步骤 1 开始重新运行 create-job。