Defined Interfaces for the Alexa Gadgets Toolkit

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Note: On December 31, 2021, we paused support for third-party device makers working with Alexa Gadgets, while we work to create an even better developer and customer experience. Please stay tuned to the Amazon developer portal for updates. In the interim, please visit the landing pages for Alexa Voice Service, Alexa Connect Kit, and Alexa Skills Kit to discover ways you can provide new customer experiences with voice.

At a high level, an Echo device sends a gadget directives. The gadget sends events to the Echo device. For example, the Echo device might send a directive to notify the gadget that a timer on the Echo device expired. The gadget might send the Echo device an event that reports its capabilities.

Directives and events are grouped into interfaces. Some interfaces are common across Alexa Voice Service (AVS), whereas some interfaces are for gadgets only. The following table contains the complete list of interfaces that gadgets support.

Interface	Purpose	Directives	Events
`Alerts`	Provides directives that instruct your gadget to set a timer, alarm, or reminder for a specific time or duration, or to delete a timer that is set.	`SetAlert` `DeleteAlert`	None
`Alexa.Discovery`	Queries the gadget for its details and capabilities.	`Discover`	`Discover.Response`
`Alexa.Gadget.MusicData`	Sends your gadget tempo data for Amazon Music that the Echo device is playing.	`Tempo`	None
`Alexa.Gadget.SpeechData`	Provides your gadget speechmark data that enables the gadget to synchronize speech with visual experiences.	`Speechmarks`	None
`Alexa.Gadget.StateListener`	Informs your gadget when an alarm, timer, or reminder is started or stopped, and when the wake word is detected. Also provides your gadget with time information from the Echo device.	`StateUpdate`	None
`Notifications`	Enables the gadget to inform users that new content is available from Alexa domains or an enabled Alexa skill.	`SetIndicator` `ClearIndicator`	None