list-core-devices¶

Description¶

Retrieves a paginated list of Greengrass core devices.

Note

IoT Greengrass relies on individual devices to send status updates to the Amazon Web Services Cloud. If the IoT Greengrass Core software isn’t running on the device, or if device isn’t connected to the Amazon Web Services Cloud, then the reported status of that device might not reflect its current status. The status timestamp indicates when the device status was last updated.

Core devices send status updates at the following times:

When the IoT Greengrass Core software starts
When the core device receives a deployment from the Amazon Web Services Cloud
When the status of any component on the core device becomes BROKEN
At a regular interval that you can configure , which defaults to 24 hours

Synopsis¶

  list-core-devices
[--thing-group-arn <value>]
[--status <value>]
[--cli-input-json | --cli-input-yaml]
[--starting-token <value>]
[--page-size <value>]
[--max-items <value>]
[--generate-cli-skeleton <value>]

Options¶

--thing-group-arn (string)

The ARN of the IoT thing group by which to filter. If you specify this parameter, the list includes only core devices that have successfully deployed a deployment that targets the thing group. When you remove a core device from a thing group, the list continues to include that core device.

--status (string)

The core device status by which to filter. If you specify this parameter, the list includes only core devices that have this status. Choose one of the following options:

HEALTHY – The IoT Greengrass Core software and all components run on the core device without issue.

UNHEALTHY – The IoT Greengrass Core software or a component is in a failed state on the core device.

Possible values:

HEALTHY

UNHEALTHY

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--starting-token (string)

A token to specify where to start paginating. This is the NextToken from a previously truncated response.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--page-size (integer)

The size of each page to get in the AWS service call. This does not affect the number of items returned in the command’s output. Setting a smaller page size results in more calls to the AWS service, retrieving fewer items in each call. This can help prevent the AWS service calls from timing out.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--max-items (integer)

The total number of items to return in the command’s output. If the total number of items available is more than the value specified, a NextToken is provided in the command’s output. To resume pagination, provide the NextToken value in the starting-token argument of a subsequent command. Do not use the NextToken response element directly outside of the AWS CLI.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command. The generated JSON skeleton is not stable between versions of the AWS CLI and there are no backwards compatibility guarantees in the JSON skeleton generated.

See ‘aws help’ for descriptions of global parameters.

Examples¶

Note

To use the following examples, you must have the AWS CLI installed and configured. See the Getting started guide in the AWS CLI User Guide for more information.

Unless otherwise stated, all examples have unix-like quotation rules. These examples will need to be adapted to your terminal’s quoting rules. See Using quotation marks with strings in the AWS CLI User Guide .

To list core devices

The following list-core-devices example lists the AWS IoT Greengrass core devices in your AWS account in the current Region.

aws greengrassv2 list-core-devices

Output:

{
    "coreDevices": [
        {
            "coreDeviceThingName": "MyGreengrassCore",
            "status": "HEALTHY",
            "lastStatusUpdateTimestamp": "2021-01-08T04:57:58.838000-08:00"
        }
    ]
}

For more information, see Check core device status in the AWS IoT Greengrass V2 Developer Guide.

Output¶

coreDevices -> (list)

A list that summarizes each core device.

(structure)

Contains information about a Greengrass core device, which is an IoT thing that runs the IoT Greengrass Core software.

coreDeviceThingName -> (string)

The name of the core device. This is also the name of the IoT thing.

status -> (string)

The status of the core device. Core devices can have the following statuses:

HEALTHY – The IoT Greengrass Core software and all components run on the core device without issue.

UNHEALTHY – The IoT Greengrass Core software or a component is in a failed state on the core device.

lastStatusUpdateTimestamp -> (timestamp)

The time at which the core device’s status last updated, expressed in ISO 8601 format.

nextToken -> (string)

The token for the next set of results, or null if there are no additional results.

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