HiveMQ CE is a Java-based open source MQTT broker that fully supports MQTT 3.x and MQTT 5. It is the foundation of the HiveMQ Enterprise Connectivity and Messaging Platform

（1）基于netty集群开发Im，通过zookeeper作为注册中心。（2）服务集群连接支持多种负载均衡策略（3）集群间消息转发提供多种解决方案。