# Release notes (/en/realtime-media/rtm/reference/release-notes/linux-java)

> For AI agents: see the complete documentation index at [llms.txt](/llms.txt).

The Agora Signaling SDK provides a streamlined and stable messaging mechanism for you to quickly implement real-time messaging for various use-cases. See [Product overview](/en/realtime-media/rtm) for more information.

This page contains release notes for each Signaling SDK platform.

      
  
      
  
      
  
      
  
      
  
      
### v2.3.0

Released on September 2, 2026.

This is the first release of the Signaling SDK for Linux Java. This release includes the following features:

* **Message channels**: Publish and subscribe to messages using the industry-standard Pub/Sub model, with no limit on the number of publishers or subscribers in a channel.
* **User channels**: Send and receive point-to-point messages by specifying a user ID directly, without subscribing to a channel.
* **Stream channels and topics**: Create stream channels and organize data streams into topics, with optional timestamp synchronization against RTC audio and video streams.
* **Presence**: Query online users and their channels, and set, get, and remove temporary user state.
* **Storage**: Set, get, remove, and subscribe to channel and user metadata.
* **Lock**: Set, acquire, release, revoke, and remove distributed locks on a channel.
* **Link state and token events**: Receive event notifications for connection state changes and upcoming token expiration through `onLinkStateEvent` and `onTokenPrivilegeWillExpire`.