The EMQ X 3.0-rc.3 release rewrite emqx_mqueue module, support MQTT-SN, CoAP and STOMP protocols.

EMQ X Core

Enhancements:

• Replace macro QOS$i to QOS_$i Github PR: emqx/emqx#1948

• Fix config descriptions of ACL cache Github PR: emqx/emqx#1950

• Rewrite emqx_mqueue module Github PR: emqx/emqx#1926

• Change lager to logger Github PR: emqx/emqx#1898

Bug Fixes:

• Fix 'badarg' bug with duplicate subscriptions Github PR: emqx/emqx#1943

• Fix 'badarg' in io_lib:format/2 when 'from' field is tuple Github PR: emqx/emqx#1954

• MQTT bridge via TLS Github PR: emqx/emqx#1949

emqx-stomp (plugin)

Enhancements:

• Improve support for receipt frame, and add test cases GitHub PR: emqx/emqx-stomp#53

emqx-sn (plugin)

Enhancements:

• Improve support for MQTT-SN protocol GitHub PR: emqx/emqx-sn#90

emqx-lua-hook (plugin)

Bug Fixes:

• Fix errors when load/unload lua hooks GitHub PR: emqx/emqx-lua-hook#41

emqx-statsd (plugin)

Enhancements:

• Add metrics GitHub PR: emqx/emqx-statsd#4

emqx-dashboard (plugin)

Enhancements:

• Add qos2/forward metric GitHub PR: emqx/emqx-dashboard#7

emqx-auth-pgsql (plugin)

Enhancements:

• Improve concurrency performance in emqx-auth-pgsql GitHub PR: emqx/emqx-auth-pgsql#94