emqx4.3/doc/design.md

eMQTT Desgin Guide

KeepAlive

Retained

QOS1

QOS2

Durable Subscriptions

Durable Sub:

Client->Queue->Router->Queue->Client

Normal Sub:

Client->Router->Client

Router to register queues

Topic Tree

Offline Message

ACL

Authentication with clientId

SSL/TLS Socket

$SYS/topics and Broker statistics...

Cluster

Bridge