这使得系统在平时消息量不大的时候工作得很好，但是随着通信负荷的增长，各种潜在的问题便逐渐浮现出来。
It works well if the traffic load is not so high, but the problems emerge and cause many troubles when the traffic load increases to a certain level.
长时间的高cpu使用率是非常有意义的关注内容，因为这可能表明站点通信量猛增，我们没有足够的硬件容量来支持这一通信负荷。
Prolonged high CPU utilization is interesting because it could mean the site is flooded with traffic, and we simply do not have enough hardware capacity to support the load.
MQTT 是基于 TCP/IP 的发布/订阅消息传递协议，针对低负荷网络的通信而设计。
MQTT is a TCP/IP-based publish/subscribe messaging protocol, designed for communication over low-overhead networks.
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