0.9.3-alpha 版本
发布日期: 2015-07-25
Wiki: [Bridge](https://github.com/emqtt/emqttd/wiki/Bridge)
Improve: emqttd_protocol.hrl to define ‘QOS_I’
Improve: emqttd_pubsub to add subscribe/2 API
Improve: ./bin/emqttd_ctl to support new bridges command
Bugfix: issue #206 - Cannot bridge two nodes