[ aws . iot-data ]

list-retained-messages

Description

Lists summary information about the retained messages stored for the account.

This action returns only the topic names of the retained messages. It doesn’t return any message payloads. Although this action doesn’t return a message payload, it can still incur messaging costs.

To get the message payload of a retained message, call GetRetainedMessage with the topic name of the retained message.

Requires permission to access the ListRetainedMessages action.

For more information about messaging costs, see IoT Core pricing - Messaging .

See also: AWS API Documentation

See ‘aws help’ for descriptions of global parameters.

Note

The default endpoint data.iot.[region].amazonaws.com is intended for testing purposes only. For production code it is strongly recommended to use the custom endpoint for your account (retrievable via the iot describe-endpoint command) to ensure best availability and reachability of the service.

list-retained-messages is a paginated operation. Multiple API calls may be issued in order to retrieve the entire data set of results. You can disable pagination by providing the --no-paginate argument. When using --output text and the --query argument on a paginated response, the --query argument must extract data from the results of the following query expressions: retainedTopics

Synopsis

  list-retained-messages
[--cli-input-json | --cli-input-yaml]
[--starting-token <value>]
[--page-size <value>]
[--max-items <value>]
[--generate-cli-skeleton <value>]

Options

--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.

See ‘aws help’ for descriptions of global parameters.

Output

retainedTopics -> (list)

A summary list the account’s retained messages. The information returned doesn’t include the message payloads of the retained messages.

(structure)

Information about a single retained message.

topic -> (string)

The topic name to which the retained message was published.

payloadSize -> (long)

The size of the retained message’s payload in bytes.

qos -> (integer)

The quality of service (QoS) level used to publish the retained message.

lastModifiedTime -> (long)

The Epoch date and time, in milliseconds, when the retained message was stored by IoT.

nextToken -> (string)

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