EMQ 學習---訂閱$SYS主題，捕獲客戶端上下線消息

acl.config文件定義了可訂閱$SYS主題的權限。node {allow, {user, "dashboard"}, subscribe, ["$SYS/#"]}. {allow, {ipaddr, "127.0.0.1"}, pubsub, ["$SYS/#", "#"]}. %%%{deny, all, subscribe, ["$SYS/#", {eq, "#"}]}. {all

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