authz:{
    rules: [
       # {
       #     type: mysql
       #     config: {
       #        server: "127.0.0.1:3306"
       #        database: mqtt
       #        pool_size: 1
       #        username: root
       #        password: public
       #        auto_reconnect: true
       #        ssl: false
       #     }
       #     sql: "select ipaddress, username, clientid, action, permission, topic from mqtt_acl where ipaddr = '%a' or username = '%u' or clientid = '%c'"
       # },
       # {
       #     type: pgsql
       #     config: {
       #        server: "127.0.0.1:5432"
       #        database: mqtt
       #        pool_size: 1
       #        username: root
       #        password: public
       #        auto_reconnect: true
       #        ssl: false
       #     }
       #     sql: "select ipaddress, username, clientid, action, permission, topic from mqtt_acl where ipaddr = '%a' or username = '%u' or username = '$all' or clientid = '%c'"
       # },
       # {
       #     type: redis
       #     config: {
       #        server: "127.0.0.1:6379"
       #        database: 0
       #        pool_size: 1
       #        password: public
       #        auto_reconnect: true
       #        ssl: false
       #     }
       #     cmd: "HGETALL mqtt_acl:%u"
       # },
       {
           permission: allow
           action: all
           topics: ["#"]
       }
    ]
}