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Showing content from https://docs.aws.amazon.com/iot/latest/apireference/API_iotdata_ListRetainedMessages.html below:

ListRetainedMessages - AWS IoT

ListRetainedMessages

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 AWS IoT Core pricing - Messaging.

Request Syntax

GET /retainedMessage?maxResults=maxResults&nextToken=nextToken HTTP/1.1

URI Request Parameters

The request uses the following URI parameters.

maxResults

The maximum number of results to return at one time.

Valid Range: Minimum value of 1. Maximum value of 200.

nextToken

To retrieve the next set of results, the nextToken value from a previous response; otherwise null to receive the first set of results.

Request Body

The request does not have a request body.

Response Syntax

HTTP/1.1 200
Content-type: application/json

{
   "nextToken": "string",
   "retainedTopics": [ 
      { 
         "lastModifiedTime": number,
         "payloadSize": number,
         "qos": number,
         "topic": "string"
      }
   ]
}

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

nextToken

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

Type: String

retainedTopics

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

Type: Array of RetainedMessageSummary objects

Errors

InternalFailureException

An unexpected error has occurred.

HTTP Status Code: 500

InvalidRequestException

The request is not valid.

HTTP Status Code: 400

MethodNotAllowedException

The specified combination of HTTP verb and URI is not supported.

HTTP Status Code: 405

ServiceUnavailableException

The service is temporarily unavailable.

HTTP Status Code: 503

ThrottlingException

The rate exceeds the limit.

HTTP Status Code: 429

UnauthorizedException

You are not authorized to perform this operation.

HTTP Status Code: 401