Introduction

The DragonConnect example will collect and display audio events.

Audio Event Storage

When the volume up button or the volume down button is pressed, the client application records and stores the event according to the diagram

The following steps occur when the volume up or volume down button is pressed

1. The volume up or volume down button is pressed.
2. The DragonConnect client application intercepts the event and transmits the event to the things/+/audio/events topic using MQTT
3. The DragonConnect-audioEvents Lambda function is invoked when a message is received on the things/+/audio/events topic
4. The DragonConnect-audioEvents Lambda function stores the event in the DragonConnect-audioEvents DynamoDB table

Audio Event Presentation

The dashboard will retrieve and display the Volume Change Log. The dashboard polls the DragonConnect API periodically and performs the following steps

1. The web browser makes a request of the /things/{thingId}/audio/events resource
2. The API Gateway, when a request is received, invokes the DragonConnect-audioEvents Lambda function
3. The DragonConnec-audioEvents Lambda function queries the DragonConnect-audioEvents table for the most recent events. The number of events retrieved is specified by the limit query parameter and defaults, if not specified, to 10
4. The web browser interprets the response and displays the appropriate event

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