Topic Support & Syntax

This section describes the topic syntax supported by PubSub+ and provides examples of valid topics for publishing and subscribing to events.

• Publishing clients use topics as subjects and as destinations that they can publish messages to.

• Subscribing clients use topics as subscriptions to attract published messages to be consumed. That is, when messages are published to a topic, matching topic subscriptions attract those messages. If a topic subscription is registered for a client or for an endpoint that the client is bound to, a client with the proper authorization can receive that message.

The Solace Message Format (SMF) and Message Queuing Telemetry Transport (MQTT) protocols use similar topic syntax, which allows SMF and MQTT messaging applications to be used together in the same messaging network. However, there are some differences in topic syntax and usage between SMF and MQTT, and you should be aware of some planning considerations if you intend to deploy MQTT applications along with SMF applications. See Using MQTT for more information.

This section includes the following information:

• Topic Architecture Best Practices
• Topic Architecture Case Studies
• Solace Message Format Topics
• Wildcard Characters in Topic Subscriptions
• Reserved Topics
• Topic Matching and Message Delivery Modes