/challenges-projects/design-challenges/connected-cloud-challenge-with-cypress-and-aws-iot/b/blog/posts/study-of-aws-shadow-sync-between-ios-and-the-cypress-iot-device-4www.youtube.com/watch In our project, which require synchronise the state between two or more devices, one is located onsite for monitoring and control physical environment (the things), another is the remote devices may virtually such as APP or the hen-USTelligent Community 12