Alexa.ColorController Interface
Implement the Alexa.ColorController interface in your Alexa skill so that users can change the color of devices such as color-changing light bulbs. For more information about Smart Home skills, see Understand the Smart Home Skill API.
For the list of languages that the ColorController interface supports, see List of Alexa Interfaces and Supported Languages.
Utterances
When you use the Alexa.ColorController interface, the voice interaction model is already built for you. The following examples show some customer utterances:
Alexa, set the front porch light to blue.
Alexa, set the bedroom light to red.
Alexa, change the kitchen to the color blue.
Alexa, setze Wohnzimmerlicht auf rosa.
After the customer says one of these utterances, Alexa sends a corresponding directive to your skill.
Properties and Objects
The color object
The color object represents the color of an endpoint. Colors are specified by using the hue, saturation, brightness (HSB) color model. For more information, see colorizer.org and The HSB Color System.
Discovery
You describe endpoints that support Alexa.ColorController using the standard discovery mechanism described in Alexa.Discovery.
Set retrievable to true for all of the interfaces and properties that you report when Alexa sends your skill a state report request. Set proactivelyReported to true for interfaces and properties that you proactively report to Alexa in a change report.
For the full list of display categories, see display categories.
Discover response example
The following example shows a Discover.Response message for a light that supports the Alexa.PowerController and Alexa.ColorController interfaces.
{
"event": {
"header": {
"namespace": "Alexa.Discovery",
"name": "Discover.Response",
"payloadVersion": "3",
"messageId": "<message id>"
},
"payload": {
"endpoints": [
{
"endpointId": "<unique ID of the endpoint>",
"manufacturerName": "<the manufacturer name of the endpoint>",
"modelName": "<the model name of the endpoint>",
"description": "<a description that is shown in the Alexa app>",
"friendlyName": "<device name, displayed in the Alexa app>",
"displayCategories": ["LIGHT"],
"cookie": {},
"capabilities": [
{
"type": "AlexaInterface",
"interface": "Alexa.PowerController",
"version": "3",
"properties": {
"supported": [
{
"name": "powerState"
}
],
"proactivelyReported": true,
"retrievable": true
}
},
{
"type": "AlexaInterface",
"interface": "Alexa.ColorController",
"version": "3",
"properties": {
"supported": [
{
"name": "color"
}
],
"proactivelyReported": true,
"retrievable": true
}
},
{
"type": "AlexaInterface",
"interface": "Alexa",
"version": "3"
}
]
}
]
}
}
}
Directives
SetColor directive
Support the SetColor directive so that customers can change the color of devices.
The following example shows a customer utterance:
Alexa, set the bedroom light to red.
Alexa, setze Wohnzimmerlicht auf rosa.
SetPercentage directive payload details
| Field | Description | Type |
|---|---|---|
color |
The color to set the device to. | Object |
SetColor directive example
The following example illustrates a SetColor directive that Alexa sends to your skill.
{
"directive": {
"header": {
"namespace": "Alexa.ColorController",
"name": "SetColor",
"messageId": "<message id>",
"correlationToken": "<an opaque correlation token>",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "<an OAuth2 bearer token>"
},
"endpointId": "<endpoint id>",
"cookie": {}
},
"payload": {
"color": {
"hue": 350.5,
"saturation": 0.7138,
"brightness": 0.6524
}
}
}
}
SetColor directive specifies hue = 0, saturation = 1, and brightness = 1. In this case, set the hue to 0, the saturation to 1, and ignore the brightness value of 1 in the directive. Instead maintain the current brightness value of 0.5.SetColor response event
If you handle a SetColor directive successfully, respond with an Alexa.Response event. In the context object, include the values of all properties that changed. You can respond synchronously or asynchronously. If you respond asynchronously, include a correlation token and a scope with an authorization token.
SetColor response event example
{
"event": {
"header": {
"namespace": "Alexa",
"name": "Response",
"messageId": "<message id>",
"correlationToken": "<an opaque correlation token>",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "<an OAuth2 bearer token>"
},
"endpointId": "<endpoint id>"
},
"payload": {}
},
"context": {
"properties": [
{
"namespace": "Alexa.ColorController",
"name": "color",
"value": {
"hue": 350.5,
"saturation": 0.7138,
"brightness": 0.6524
},
"timeOfSample": "2019-07-03T16:20:50Z",
"uncertaintyInMilliseconds": 500
}
]
}
}
SetColor directive error handling
If you can't handle a SetColor directive successfully, respond with an Alexa.ErrorResponse event.
State reporting
Alexa sends a ReportState directive to request information about the state of an endpoint. When Alexa sends a ReportState directive, you send a StateReport event in response. The response contains the current state of all of the retrievable properties in the context object. You identify your retrievable properties in your discovery response. For details about state reports, see Understand State and Change Reporting.
StateReport response event example
{
"event": {
"header": {
"namespace": "Alexa",
"name": "StateReport",
"messageId": "<message id>",
"correlationToken": "<an opaque correlation token>",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "<an OAuth2 bearer token>"
},
"endpointId": "<endpoint id>"
},
"payload": {}
},
"context": {
"properties": [
{
"namespace": "Alexa.ColorController",
"name": "color",
"value": {
"hue": 350.5,
"saturation": 0.7138,
"brightness": 0.6524
},
"timeOfSample": "2019-07-03T16:20:50Z",
"uncertaintyInMilliseconds": 500
}
]
}
}
Change reporting
You send a ChangeReport event to proactively report changes in the state of an endpoint. You identify the properties that you proactively report in your discovery response. For details about change reports, see Understand State and Change Reporting.
For lighting endpoints that support both the ColorController and ColorTemperatureController interfaces, report the state of color when an endpoint is set to a color, and report the state of colorTemperatureInKelvin when an endpoint is set to a shade of white.
ChangeReport event example
{
"event": {
"header": {
"namespace": "Alexa",
"name": "ChangeReport",
"messageId": "<message id>",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "<an OAuth2 bearer token>"
},
"endpointId": "<endpoint id>"
},
"payload": {
"change": {
"cause": {
"type": "PHYSICAL_INTERACTION"
},
"properties": [
{
"namespace": "Alexa.ColorController",
"name": "color",
"value": {
"hue": 280,
"saturation": 0.9,
"brightness": 0.9
},
"timeOfSample": "2019-07-03T16:20:50Z",
"uncertaintyInMilliseconds": 500
}
]
}
}
},
"context": {}
}
