This article introduces how to create a topic category for a product. Topic categories will be automatically assigned to devices of the product.


  1. Log on to the IoT Platform console.
  2. In the left-side navigation pane, click Devices > Products
  3. On the Products page, find the product for which you want to create a topic category, and click View in the operation column.
  4. On the Product Details page, click Topic Categories > Custom Topics > Edit Topic Category.
  5. Define a topic category.
    • Device Operation Authorizations: Indicates the operations that devices can perform on the topics of this topic category. You can select from Publish, Subscribe, and Publish and Subscribe.
    • Topic Category: Enter a custom topic category name according to the Topic Rule on the page.
    • Description: Describes the topic category. You can leave this box empty.
  6. Click OK.

Wildcard characters in topic categories

When you create topic categories, you can use wildcards. For more information about wildcards, see What is a topic? Supported wildcards:
  • #: Includes the category level you enter and all lower levels in topics.
  • +: Includes only one category level in topics, and not lower levels.
Note When you want to create topic categories with wildcards, note that:
  • Only topics with Device Operation Authorizations as Subscription support wildcards.
  • # can only be at the end of topics.
  • For topics with wildcard characters, you cannot click Publish to publish messages on the Topic List tab page of devices.