增加3秒云服务器连接检测，连不上服务器的时候不刷新数据

wxr

2024-04-12 a155c6ce1911e995d136f08b409dd0861706a3f8

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#import <Foundation/Foundation.h>
@interface PodsDummy_MQTTClient : NSObject
@end
@implementation PodsDummy_MQTTClient
@end