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What is the lifecycle of a device and its Device Shadow in AWS IoT Core?

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posted Nov 30 by Asma Nooren P

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1 Answer

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  • You register a device (such as a light bulb) in the Registry.
  • You program connected device to publish a set of its property values or ‘state (“I am ON and my color is RED”) to the AWS IoT Core service.
  • The last reported state is stored in the Device Shadow in AWS IoT Core.
  • An application (such as a mobile app controlling the light bulb) uses a RESTful API to query AWS IoT Core for the last reported state of the light bulb, without the complexity of communicating directly with the light bulb.
  • When a user wants to change the state (such as turning the light bulb from ON to OFF), the application uses a RESTful API to request an update, i.e. sets a ‘desired’ state for the device in AWS IoT Core. AWS IoT Core takes care of synchronizing the desired state to the device.
  • The application gets notified when the connected device updates its state to the desired state.
answer Dec 3 by Sonal Salian
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