EMQX连接成功后，间隔一分钟会出现条AUTHZ消息

EMQX 错误报告
3

认证配置的是mysql，没用到JWT。数据库返回了密码，用户名
SELECT password as password_hash,clientid,username FROM mqtt_user WHERE username=${username} LIMIT 1

客户端授权，用的是默认的配置

{allow, {username, {re, "^dashboard$"}}, subscribe, ["$SYS/#"]}.

{allow, {ipaddr, "127.0.0.1"}, all, ["$SYS/#", "#"]}.

{deny, all, subscribe, ["$SYS/#", {eq, "#"}]}.

{allow, all}.