EMQ R2.3-beta.2 版本正式发布！该版本新增HTTP管理API，支持集群粒度的连接与会话管理，集群节点的性能指标监控，并支持节点、插件配置通过命令行热更新。
支持配置热更新的插件包括:
emq-stomp
emq-coap
emq-sn
emq-lwm2m
emq-dashboard
emq-retainer
emq-recon
emq-web-hook
emq-auth-jwt
emq-auth-http
emq-auth-mongo
emq-auth-mysql
emq-auth-pgsql
emq-auth-redis
功能与改进
新增集群粒度的HTTP管理API
HTTP Publish接口支持ClientId参数
支持配置Keepalive超时检测周期
删除连接、会话的默认fullsweep_after参数，以降低在高消息吞吐下的CPU使用率
支持通过ClientId认证HTTP Publish请求
emq-sn 插件 (emq-sn#49)
Support CONNECT message in connected/wait_for_will_topic/wait_for_will_msg states.
Clean registered topic for a restarted client.
Bug
fix of not clearing buffered PUBLISH messages received during asleep
state as those messages are sent to client when client wakes up.
emq-auth-ldap Plugin (emq-auth-ldap#21)
Improve the design LDAP authentication.
emq-coap Plugin (emq-coap#51)
Support CoAP PubSub Specification (https://www.ietf.org/id/draft-ietf-core-coap-pubsub-02.txt)
