https://docs.emqx.io/broker/latest/cn/advanced/retained.html
保留消息:emqx_retainer路径:cd /etc/emqx/plugins
快速定位字符串位置:/字符串
日志文件:/var/log/emqx
https://docs.emqx.io/broker/latest/cn/advanced/retained.html
保留消息:emqx_retainer路径:cd /etc/emqx/plugins
快速定位字符串位置:/字符串
日志文件:/var/log/emqx