Minor release with the following features, improvements, and bug fixes.

Main features:

• #94 MQTT 5: Request-Response Pattern;
• #98 MQTT 5: Flow Control;
• #101 UI: WebSocket client page; WebSocket connections and subscriptions entities support in Postgres.

Improvements:

• Core and install scripts:

  • #104 TLS Cipher suites control - allows to set desired cipher suites usage;
  • #109 Backpressure improvements;
  • #110 Disconnect client command now includes Reason Codes to correctly specify the reason of the disconnection;
  • #111 MQTT over WebSockets installation scripts update for correct WebSocket client usage;
  • Added system WebSocket MQTT client credentials;
  • Application persistent and Application Shared Subscriptions clients workflow improvement by leveraging cached thread pool;
  • Non-blocking deletion of old Kafka consumer groups on broker startup;
  • Memory usage and performance improvements.

Bug fixes:

• Core:

  • #106 Fix for direct memory leak;
  • #107 Fix for unauthorized delivery of Last Will message;
  • #94 Fixed Maximum Packet Size response to MQTT 5 client depending on the listener chosen;
  • Fixed NPE that can happen on broker startup during historical statistics calculation;
  • Disabled Redis autoconfiguration in case of Caffeine cache usage to prevent trying to connect to Redis instance on broker startup;
  • Dependency vulnerabilities;
  • User password containing only whitespaces bugfix.

• UI:

  • #108 Fix for issue during Retained message deletion that contains special characters;
  • Resolved an issue with hidden fields in edit mode for MQTT client credentials details of the type "X.509 Certificate Chain".

Obsolete environment variables:

• TB_APP_PERSISTED_MSG_THREADS_COUNT;
• TB_APP_PERSISTED_MSG_SHARED_SUBS_THREADS_COUNT.

These environment variables can be safely removed due to automatic scaling of threads based on the number of Application clients being added or removed.