## Highlights
Improve and Consolidate the design of Hook, Server, PubSub and Router
Bridge emqttd broker to another emqttd broker & emqttd to mosquitto bridge (#438)
## Enhancements
emqttd_ctl: better error message (#450)
./bin/emqttd_ctl: add 'routes' command
```
routes list # List all routes
routes show <Topic> # Show a route
```
Add 'backend_subscription' table and support static subscriptions (emqttd_backend)
Add 'retained_message' table and refactor emqttd_retainer module (emqttd_backend)
A New Hook and Callback Design (emqttd_hook)
Add PubSub, Hooks APIs to emqttd module (emqttd)
Move start_listeners/0, stop_listeners/0 APIs to emqttd_app module (emqttd_app)
## Tests
Add 100+ common test cases.
## Plugins
Upgrade Dashboard, Redis, Stomp and Template Plugins
## Downloads