## MQTT 5.0

1. Topic Alias
2. Subscriber ID
3. Session ensure stats
4. Message Expiration

## Connection

## WebSocket

## Listeners

## Protocol

1. Global ACL cache with limited age and size?
2. Whether to enable ACL for each zone?

## Session

## Bridges

Config
CLI
Remote Bridge
replay queue

## Access Control

  Global ACL Cache
  Add ACL cache emqx_access_control module

## Zone

## Hooks

The hooks design...

## MQueue

Bound Queue
LastValue Queue
Priority Queue

## Supervisor tree

KernelSup

## Managment

## Dashboard

## Testcases

1. Update the README.md
2. Update the Documentation
3. Shared subscription and dispatch strategy
4. Remove lager syslog:
   dep_lager_syslog = git https://github.com/basho/lager_syslog