Cleaning up your devices after building demos with the Amazon IoT Device Client Cleaning up after building demos with the Amazon IoT Device Client

Tutorial: Cleaning up after running the Amazon IoT Device Client tutorials

The procedures in this tutorial walk you through removing the files and resources you created while completing the tutorials in this learning path.

Procedures in this tutorial

Step 1: Cleaning up your devices after building demos with the Amazon IoT Device Client
Step 2: Cleaning up your Amazon Web Services account after building demos with the Amazon IoT Device Client

Step 1: Cleaning up your devices after building demos with the Amazon IoT Device Client

This tutorial describes two options for how to clean up the microSD card after you built the demos in this learning path. Choose the option that provides the level of security that you need.

Note that cleaning the device's microSD card does not remove any Amazon IoT resources that you created. To clean up the Amazon IoT resources after you clean the device's microSD card, you should review the tutorial on Step 2: Cleaning up your Amazon Web Services account after building demos with the Amazon IoT Device Client.

Option 1: Cleaning up by rewriting the microSD card

The easiest and most thorough way to clean the microSD card after completing the tutorials in this learning path is to overwrite the microSD card with a saved image file that you created while preparing your device the first time.

This procedure uses the local host computer to write a saved microSD card image to a microSD card.

Note

If your device doesn't use a removable storage medium for its operating system, refer to the procedure for that device.

To write a new image to the microSD card

On your local host computer, locate the saved microSD card image that you want to write to your microSD card.
Insert your microSD card into the local host computer.
Using an SD card imaging tool, write selected image file to the microSD card.
After writing the Raspberry Pi OS image to the microSD card, eject the microSD card and safely remove it from the local host computer.

Your microSD card is ready to use.

Option 2: Cleaning up by deleting user directories

To clean the microSD card after completing the tutorials without rewriting the microSD card image, you can delete the user directories individually. This is not as thorough as rewriting the microSD card from a saved image because it does not remove any system files that might have been installed.

If removing the user directories is sufficiently thorough for you needs, you can follow this procedure.

To delete this learning path's user directories from your device

Run these commands to delete the user directories, subdirectories, and all their files that were created in this learning path, in the terminal window connected to your device.

Note
After you delete these directories and files, you won't be able to run the demos without completing the tutorials again.
```
rm -Rf ~/dc-configs
rm -Rf ~/policies
rm -Rf ~/messages
rm -Rf ~/certs
rm -Rf ~/.aws-iot-device-client
```
Run these commands to delete the application source directories and files, in the terminal window connected to your device.

Note
These commands don't uninstall any programs. They only remove the source files used to build and install them. After you delete these files, the Amazon CLI and the Amazon IoT Device Client might not work.
```
rm -Rf ~/aws-cli
rm -Rf ~/aws
rm -Rf ~/aws-iot-device-client
```

Step 2: Cleaning up your Amazon Web Services account after building demos with the Amazon IoT Device Client

These procedures help you identify and remove the Amazon resources that you created while completing the tutorials in this learning path.

Clean up Amazon IoT resources

This procedure helps you identify and remove the Amazon IoT resources that you created while completing the tutorials in this learning path.

Amazon IoT resources created in this learning path
Tutorial	Thing resource	Policy resource
Tutorial: Installing and configuring the Amazon IoT Device Client	DevCliTestThing	DevCliTestThingPolicy
Tutorial: Demonstrate MQTT message communication with the Amazon IoT Device Client	PubSubTestThing	PubSubTestThingPolicy
Tutorial: Demonstrate remote actions (jobs) with the Amazon IoT Device Client	user defined (there could be more than one)	user defined (there could be more than one)

To delete the Amazon IoT resources, follow this procedure for each thing resource that you created

Replace thing_name with the name of the thing resource you want to delete, and then run this command to list the certificates attached to the thing resource, from the local host computer.
```
aws iot list-thing-principals --thing-name thing_name
```
This command returns a response like this one that lists the certificates that are attached to thing_name. In most cases, there will only be one certificate in the list.
```
{
    "principals": [
        "arn:aws:iot:us-west-2:57EXAMPLE833:cert/23853eea3cf0edc7f8a69c74abeafa27b2b52823cab5b3e156295e94b26ae8ac"
    ]
}
```
For each certificate listed by the previous command:
1. Replace certificate_ID with the certificate ID from the previous command. The certificate ID is the alphanumeric characters that follow cert/ in the ARN returned by the previous command. Then run this command to inactivate the certificate.
```
aws iot update-certificate --new-status INACTIVE --certificate-id certificate_ID
```
  If successful, this command doesn't return anything.
2. Replace certificate_ARN with the certificate ARN from the list of certificates returned earlier, and then run this command to list the policies attached to this certificate.
```
aws iot list-attached-policies --target certificate_ARN
```
  This command returns a response like this one that lists the policies attached to the certificate. In most cases, there will only be one policy in the list.
```
{
    "policies": [
        {
            "policyName": "DevCliTestThingPolicy",
            "policyArn": "arn:aws:iot:us-west-2:57EXAMPLE833:policy/DevCliTestThingPolicy"
        }
    ]
}
```
3. For each policy attached to the certificate:
  1. Replace policy_name with the policyName value from the previous command, replace certificate_ARN with the certificate's ARN, and then run this command to detach the policy from the certificate.
```
aws iot detach-policy --policy-name policy_name --target certificate_ARN
```
    If successful, this command doesn't return anything.
  2. Replace policy_name with the policyName value, and then run this command to see if the policy is attached to any more certificates.
```
aws iot list-targets-for-policy --policy-name policy_name
```
    If the command returns an empty list like this, the policy is not attached to any certificates and you continue to list the policy versions. If there are still certificates attached to the policy, continue with the detach-thing-principal step.
```
{
    "targets": []
}
```
  3. Replace policy_name with the policyName value, and then run this command to check for policy versions. To delete the policy, it must have only one version.
```
aws iot list-policy-versions --policy-name policy_name
```
    If the policy has only one version, like this example, you can skip to the delete-policy step and delete the policy now.
```
{
    "policyVersions": [
        {
            "versionId": "1",
            "isDefaultVersion": true,
            "createDate": "2021-11-18T01:02:46.778000+00:00"
        }
    ]
}
```
    If the policy has more than one version, like this example, the policy versions with an isDefaultVersion value of false must be deleted before the policy can be deleted.
```
{
    "policyVersions": [
        {
            "versionId": "2",
            "isDefaultVersion": true,
            "createDate": "2021-11-18T01:52:04.423000+00:00"
        },
        {
            "versionId": "1",
            "isDefaultVersion": false,
            "createDate": "2021-11-18T01:30:18.083000+00:00"
        }
    ]
}
```
    If you need to delete a policy version, replace policy_name with the policyName value, replace version_ID with the versionId value from the previous command, and then run this command to delete a policy version.
```
aws iot delete-policy-version --policy-name policy_name --policy-version-id version_ID
```
    If successful, this command doesn't return anything.
    
    After you delete a policy version, repeat this step until the policy has only one policy version.
  4. Replace policy_name with the policyName value, and then run this command to delete the policy.
```
aws iot delete-policy --policy-name policy_name
```
4. Replace thing_name with the thing's name, replace certificate_ARN with the certificate's ARN, and then run this command to detach the certificate from the thing resource.
```
aws iot detach-thing-principal --thing-name thing_name --principal certificate_ARN
```
  If successful, this command doesn't return anything.
5. Replace certificate_ID with the certificate ID from the previous command. The certificate ID is the alphanumeric characters that follow cert/ in the ARN returned by the previous command. Then run this command to delete the certificate resource.
```
aws iot delete-certificate --certificate-id certificate_ID
```
  If successful, this command doesn't return anything.
Replace thing_name with the thing's name, and then run this command to delete the thing.
```
aws iot delete-thing --thing-name thing_name
```
If successful, this command doesn't return anything.

Clean up Amazon resources

This procedure helps you identify and remove other Amazon resources that you created while completing the tutorials in this learning path.

Other Amazon resources created in this learning path
Tutorial	Resource type	Resource name or ID
Tutorial: Demonstrate remote actions (jobs) with the Amazon IoT Device Client	Amazon S3 object	hello-world-job.json
Tutorial: Demonstrate remote actions (jobs) with the Amazon IoT Device Client	Amazon IoT job resources	user defined

To delete the Amazon resources created in this learning path

To delete the jobs created in this learning path

Run this command to list the jobs in your Amazon Web Services account.


aws iot list-jobs

The command returns a list of the Amazon IoT jobs in your Amazon Web Services account and Amazon Web Services Region that looks like this.


{
    "jobs": [
        {
            "jobArn": "arn:aws:iot:us-west-2:57EXAMPLE833:job/hello-world-job-2",
            "jobId": "hello-world-job-2",
            "targetSelection": "SNAPSHOT",
            "status": "COMPLETED",
            "createdAt": "2021-11-16T23:40:36.825000+00:00",
            "lastUpdatedAt": "2021-11-16T23:40:41.375000+00:00",
            "completedAt": "2021-11-16T23:40:41.375000+00:00"
        },
        {
            "jobArn": "arn:aws:iot:us-west-2:57EXAMPLE833:job/hello-world-job-1",
            "jobId": "hello-world-job-1",
            "targetSelection": "SNAPSHOT",
            "status": "COMPLETED",
            "createdAt": "2021-11-16T23:35:26.381000+00:00",
            "lastUpdatedAt": "2021-11-16T23:35:29.239000+00:00",
            "completedAt": "2021-11-16T23:35:29.239000+00:00"
        }
    ]
}

For each job that you recognize from the list as a job you created in this learning path, replace jobId with the jobId value of the job to delete, and then run this command to delete an Amazon IoT job.
```
aws iot delete-job --job-id jobId
```
If the command is successful, it returns nothing.

To delete the job documents you stored in an Amazon S3 bucket in this learning path.

Replace bucket with the name of the bucket you used, and then run this command to list the objects in the Amazon S3 bucket that you used.


aws s3api list-objects --bucket bucket

The command returns a list of the Amazon S3 objects in bucket that looks like this.


{
    "Contents": [
        {
            "Key": "hello-world-job.json",
            "LastModified": "2021-11-18T03:02:12+00:00",
            "ETag": "\"868c8bc3f56b5787964764d4b18ed5ef\"",
            "Size": 54,
            "StorageClass": "STANDARD",
            "Owner": {
                "DisplayName": "EXAMPLE",
                "ID": "e9e3d6ec1EXAMPLEf5bfb5e6bd0a2b6ed03884d1ed392a82ad011c144736a4ee"
            }
        },
        {
            "Key": "iot_job_firmware_update.json",
            "LastModified": "2021-04-13T21:57:07+00:00",
            "ETag": "\"7c68c591949391791ecf625253658c61\"",
            "Size": 66,
            "StorageClass": "STANDARD",
            "Owner": {
                "DisplayName": "EXAMPLE",
                "ID": "e9e3d6ec1EXAMPLEf5bfb5e6bd0a2b6ed03884d1ed392a82ad011c144736a4ee"
            }
        },
        {
            "Key": "order66.json",
            "LastModified": "2021-04-13T21:57:07+00:00",
            "ETag": "\"bca60d5380b88e1a70cc27d321caba72\"",
            "Size": 29,
            "StorageClass": "STANDARD",
            "Owner": {
                "DisplayName": "EXAMPLE",
                "ID": "e9e3d6ec1EXAMPLEf5bfb5e6bd0a2b6ed03884d1ed392a82ad011c144736a4ee"
            }
        }
    ]
}

For each object that you recognize from the list as an object you created in this learning path, replace bucket with the bucket name and key with key value of the object to delete, and then run this command to delete an Amazon S3 object.
```
 aws s3api delete-object --bucket bucket --key key
```
If the command is successful, it returns nothing.

After you delete all the Amazon resources and objects that you created while completing this learning path, you can start over and repeat the tutorials.

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Step 2: Create and run the job in Amazon IoT

Building solutions with the Amazon IoT Device SDKs