我们可以以任何方式使用网络信息来区分前置和后端？

- (NSDictionary *)fetchSSIDInformation { 
       NSArray *interfaceNames = CFBridgingRelease(CNCopySupportedInterfaces());
       NSLog(@"%s: Supported interfaces: %@",func,interfaceNames);
       NSDictionary *SSIDInfo; 
       for (NSString *interfaceName in interfaceNames)
          { 
            SSIDInfo = CFBridgingRelease( CNCopyCurrentNetworkInfo((bridge CFStringRef)interfaceName)); 
            NSLog(@"%s: %@ => %@",__func,interfaceName,SSIDInfo); 
            BOOL isNotEmpty = (SSIDInfo.count > 0); 
            if (isNotEmpty) { break; } 
          }

      return SSIDInfo;
}