Querying Product Topics

Function

This API is used to query product topics.

URI

GET /v2/{project_id}/link/instances/{instance_id}/products/{product_id}/topics

**Table 1** Path parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Project ID. For details about how to obtain the project ID, see Appendix > Obtaining a Project ID in the ROMA Connect API Reference. Minimum: 0 Maximum: 32
instance_id	Yes	String	Instance ID. Minimum: 0 Maximum: 36
product_id	Yes	Integer	Product ID. Minimum: 0 Maximum: 99999999999999999

**Table 2** Query parameters
Parameter	Mandatory	Type	Description
limit	No	Integer	Number of items displayed on each page. The maximum value is 999. If the value exceeds 999, only 999 items are returned. Minimum: 0 Maximum: 999999 Default: 10
offset	No	Integer	Offset, which is the position where the query starts. The value must be greater than or equal to 0. Minimum: 0 Maximum: 999999 Default: 0

Request Parameters

None

Response Parameters

Status code: 200

**Table 3** Response body parameters
Parameter	Type	Description
total	Integer	Total. Minimum: 0 Maximum: 9999999999999999
size	Integer	Number of records displayed on each page. Minimum: 1 Maximum: 999
items	Array of ProductTopic objects	Product topic list.

**Table 4** ProductTopic
Parameter	Type	Description
product_id	Integer	Homing product ID. Minimum: 1 Maximum: 99999999999999999
topic_id	String	Product topic ID. Minimum: 1 Maximum: 99999999999999999
permission	Integer	Topic permission. The options are as follows: 0: publish; 1: subscribe. Minimum: 0 Maximum: 10
topic_name	String	Topic name. Minimum: 0 Maximum: 64
version	String	Version number. Minimum: 0 Maximum: 10
description	String	Description. Minimum: 0 Maximum: 200

Status code: 400

**Table 5** Response body parameters
Parameter	Type	Description
error_code	String	System error code, which is the detailed error code of HTTP error codes 4xx and 5xx. Minimum: 0 Maximum: 64
error_msg	String	Error description. Minimum: 0 Maximum: 200
request_id	String	Message ID. Minimum: 0 Maximum: 64

Status code: 404

**Table 6** Response body parameters
Parameter	Type	Description
error_code	String	System error code, which is the detailed error code of HTTP error codes 4xx and 5xx. Minimum: 0 Maximum: 64
error_msg	String	Error description. Minimum: 0 Maximum: 200
request_id	String	Message ID. Minimum: 0 Maximum: 64

Status code: 500

**Table 7** Response body parameters
Parameter	Type	Description
error_code	String	System error code, which is the detailed error code of HTTP error codes 4xx and 5xx. Minimum: 0 Maximum: 64
error_msg	String	Error description. Minimum: 0 Maximum: 200
request_id	String	Message ID. Minimum: 0 Maximum: 64

Example Requests

GET /{project_id}/link/instances/{instance_id}/products/{product_id}/topics

Example Responses

Status code: 200

{
  "total" : 1,
  "size" : 1,
  "items" : [ {
    "product_id" : 122888,
    "topic_id" : "17",
    "permission" : 1,
    "topic_name" : "/3.0/${deviceId}/t1",
    "version" : "3.0",
    "description" : "description"
  } ]
}

Status code: 400

Bad Request

{
  "error_code" : "SCB.00000000",
  "error_msg" : "Parameter is not valid for operation [romalink.link-product-topic.queryProductTopic]. Parameter is [productId]. Processor is [path].",
  "requestId" : "cb39e78a-afd3-4e04-901d-70468b1c23dc-1619602712496-cnnorth7a-P-romalink-service01"
}

Status code: 404

Not Found

{
  "error_code" : "ROMA.00110006",
  "error_msg" : "The resource does not exist. Check whether the resource ID ff38023c-0854-4779-847d-72528e1f5da5 is correct.",
  "requestId" : "72b07918-f6a2-4721-81bf-f3fd5486025e-1619663576836-cnnorth7a-P-romalink-service01"
}

Status code: 500

Internal Server Error

{
  "error_code" : "ROMA.00110002",
  "error_msg" : "The instance does not exist. project_id: 397cd10b30544c588b2f4a56d83856c4, instance_id: f3bb386a-23ec-47aa-9943-4c60ac658611",
  "request_id" : "c8c06d0a-be92-4fdf-9d10-bc20131ab158-1619593104919-cnnorth7a-P-romalink-service01"
}