The EMQ X 3.0-rc.2 release improved the Will Message publishing mechanism, and add support for using ssl certificate as MQTT username.

EMQ X Core

Enhancements:

• Improve publish mechanism of Will Message Github PR: emqx/emqx#1889

• Support for using ssl certificate as MQTT username Github PR: emqx/emqx#1913

• Improve test coverage for modules Github PR: emqx/emqx#1921

Bug Fixes:

• Fix 'bad argument' error when emqx_broker:subscribed is called Github PR: emqx/emqx#1921