The EMQ X 3.0-beta.2 release is mainly for bug fixes and feature improvements on MQTT 5.0.

EMQ X Core

Enhancements:

• Support subscription options of MQTT 5.0 GitHub issues: emqx/emqx#1788, emqx/emqx-retainer#58, emqx/emqx#1803

• Add validations for 'Topic-Alias' of MQTT 5.0 GitHub issues: emqx/emqx#1789, emqx/emqx#1802

• Improve the design of hooks GitHub issue: emqx/emqx#1790

• Rename 'emqx_mqtt_properties' module to 'emqx_mqtt_props' GitHub issue: emqx/emqx#1791

• Update emqx_zone GitHub issue: emqx/emqx#1795

Bug Fixes:

• Fix an issue about 'Will Delay Interval' property GitHub issues: emqx/emqx#1800, emqx/emqx-delayed-publish#3

• Fix an issue about 'Reserved' flag GitHub issue: emqx/emqx#1783

• Generate a config file for testing GitHub issue: emqx/emqx#1794

emqx-management (plugin)

Enhancements:

• Add restful APIs for banned GitHub issue: emqx/emqx-management#6

emqx-delayed-publish (plugin)

Enhancements:

• Refactor the code GitHub issue: emqx/emqx-delayed-publish#4

minirest (dependency)

Enhancements:

• Pass both query and body params within the callback args GitHub issue: emqx/minirest#4

emqx-rel (build-project)

Enhancements:

• Fail fast in case the otp version in use is 20 or older GitHub issue: emqx/emqx-rel#217