区分消息订阅类型，新增上下线监听，修复定时帧缺少CRC32，替换设备在线状态查询方法

Van333

2022-11-16 51af3e4e7c5fb612576b98fd6407f6b65859f374

 ximon-admin/src/main/java/com/sandu/ximon/admin/localMQTT/model/LocalMqttMsg.java

@@ -26,6 +26,6 @@
        this.timestamp = String.valueOf(System.currentTimeMillis());
        this.connectType = "1";
        this.msgType = "1";
        this.payload = "FEA501000BFE010003FFFF640F48B1367ABDE0B9";
        this.payload = "";
    }
}