Granted QOS different to Requested QOS

EMQ重新安装后，项目开启的时候报错： Granted QOS different to Requested QOS; topics: [$SYS/brokers/+/clients/+/connected, $SYS/brokers/+/clients/+/disconnected] requested: [1, 1] granted: [128, 128] 原因大概就是要允许客户端订阅"$SY

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