Device commands
When you are building an IoT application, you need the ability to interact with your device through commands remotely. For example:
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In the industrial vertical, remote commands are used to request specific data from a piece of equipment.
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In the smart home vertical, remote commands are used to schedule an alarm system remotely.
With AWS IoT Core, you can use the bi-directional MQTT protocol to implement command and control of devices. The device subscribes to a specific command MQTT topic. When the device receives a command message, it should verify that the message arrived in the correct order by implementing a sequential ID. The device should then perform the action, and publish a message to the cloud with the results of the command. This makes sure that commands are acted upon in order, and the device's current state is consistently known and maintained in the cloud.
Using a message broker to send commands to a device.
