CoAP协议支持插件(Beta):

‘$u’, ‘$c’ variables in emqttd.conf and modules/acl.conf changed to ‘%u’, ‘%c’

Add ‘session.subscribed’, ‘session.unsubscribed’ hooks, remove ‘client.subscribe.after’ hook

Tab ‘retained_message’ -> ‘mqtt_retained’

Fixing issues in cluster mode. (PR #681)

Fixing issues with unsubscribe hook (PR #673)