优化订阅机制，需要重新订阅时，取消命令发送后再发送订阅命令 #1273

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2024-02-20 a9ab5c28e9fd52c1d936a245ac46c9e556f6bc3e

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package com.genersoft.iot.vmp.media.zlm.dto;
 
public class ServerKeepaliveData {
}