bugfix：目录订阅收到更新事件时，sql字段update_time为空导致的报错

lishuyuan

2023-11-02 8bd2f47c9a92ffcf5ae43fae965eaefd4748e263

 src/main/java/com/genersoft/iot/vmp/service/IPlatformService.java

@@ -55,4 +55,6 @@
     * @param platformId 平台
     */
    void sendNotifyMobilePosition(String platformId);

    void addSimulatedSubscribeInfo(ParentPlatform parentPlatform);
}