Alerts 1.3
The Alerts Interface of the Alexa Voice Service (AVS) exposes directives and events that set, manage, and cancel timers, alarms, and reminders. For a user to set an alert, your client must have an active internet connection to receive directives that instruct your client to take action. For example, SetAlert
and DeleteAlert
and to send events that inform AVS about an event on the client, such as SetAlertSucceeded
and DeleteAlertSucceeded
.
See the Alerts Overview and the Interaction Model for more implementation details.
Version changes
- The Alerts interface v1.3 allows the deletion of all client alerts through the
DeleteAlerts
directive,DeleteAlertsFailed
event, andDeleteAlertsSucceeded
event. - The Alerts v1.3 interface includes the
SetVolume
andAdjustVolume
directives, and theVolumeChanged
event. The addition of these directives and events enable the user to control alert volume by using the Amazon Alexa app. - v1.3 supports users selecting custom alert tones within the Amazon Alexa app. See AVS UX Attention System for guidance on how to manage alerts, including custom alerts, for your product.
Capability assertion
A device can't implement Alerts 1.3 on behalf of connected endpoints but can implement Alerts 1.3 itself.
New AVS integrations must assert support through Alexa.Discovery, but AVS continues support for legacy integrations through the Capabilities API.
Sample Object
{ "type": "AlexaInterface", "interface": "Alerts", "version": "1.3", "configurations": { "maximumAlerts": { "overall": {{INTEGER}}, "alarms": {{INTEGER}}, "timers": {{INTEGER}} } } }
Configuration Parameters
Parameter | Description | Type |
---|---|---|
maximumAlerts | An object that contains configuration information for your Alerts implementation. | object |
maximumAlerts.overall | Maximum total number of timers plus alarms stored on a device at a given time. | integer |
maximumAlerts.alarms | Maximum number of alarms stored on a device at a given time. | integer |
maximumAlerts.timers | Maximum number of timers stored on a device at a given time. | integer |
maximumAlerts.alarms
and maximumAlerts.timers
might exceed the value provided for maximumAlerts.overall
. For example, if you declare that maximumAlerts.overall
== 10
and that maximumAlerts.alarms
and maximumAlerts.timers
each == 8
; but a user sets seven alarms, the user is then limited to setting three timers.Context
Alexa expects a client to report the status of all locally stored alerts with each event that requires context. Individual alerts belong to one of two categories: allAlerts
and activeAlerts
. allAlerts
is a complete list of locally stored alerts. activeAlerts
is a list of alerts in focus or sounding for a user.
To learn more about reporting Context, see Context Overview.
Sample message
{ "header": { "namespace": "Alerts", "name": "AlertsState" }, "payload": { "allAlerts": [ { "token": "{{STRING}}", "type": "{{STRING}}", "scheduledTime": "{{STRING}}" } ], "activeAlerts": [ { "token": "{{STRING}}", "type": "{{STRING}}", "scheduledTime": "{{STRING}}" } ] } }
Payload parameters
Parameter | Description | Type |
---|---|---|
allAlerts | Key/value pairs for allAlerts | object |
allAlerts.token | Alert token returned by Alexa when the user sets the alert. | string |
allAlerts.type | Identifies the alert type.
Accepted Values: TIMER, ALARM, REMINDER. |
string |
allAlerts.scheduledTime | Timestamp for when the alert is scheduled, in YYYY-MM-DDThh:mm:ss±hhmm ISO 8601 format.
Example value: "2018-11-28T09:34:32+0000" |
string |
activeAlerts | Key/value pairs for activeAlerts | object |
activeAlerts.token | The token for the alert current active alert. | string |
activeAlerts.type | Identifies the alert type.
Accepted Values: TIMER or ALARM |
string |
activeAlerts.scheduledTime | Timestamp for when the alert is scheduled, in YYYY-MM-DDThh:mm:ss±hhmm ISO 8601 format.
Example value: "2018-11-28T09:34:32+0000" |
string |
Directives
SetAlert
The SetAlert
directive instructs your client to set a timer, alarm, or reminder for a specific duration or time. Clients receive the SetAlert
directive when a user makes a speech request to set or re-enable an alert through the Amazon Alexa app.
If loopCount
is absent from the payload, the alert must sound for one hour or until stops the alert with a voice request or physically interacting with the client.
AVS-provided assets
take precedence over locally stored audio files. If AVS provides assets
, the client must play them for the user in the order provided in the assetPlayOrder
list. Otherwise, use the audio files for alerts provided by Amazon.
assets.url[i]
is unreachable, or if your client fails to download the associated files, it should play the audio files for the associated alert type provided by Amazon and adhere to the provided loopCount
and loopPauseInMilliSeconds
.Sample message
{ "directive": { "header": { "namespace": "Alerts", "name": "SetAlert", "messageId": "{{STRING}}", "dialogRequestId": "{{STRING}}" }, "payload": { "token": "{{STRING}}", "type": "{{STRING}}", "scheduledTime": "{{STRING}}", "assets": [ { "assetId": "{{STRING}}", "url": "{{STRING}}" }, { "assetId": "{{STRING}}", "url": "{{STRING}}" }, ], "assetPlayOrder": [ {{LIST}} ], "backgroundAlertAsset": "{{STRING}}", "loopCount": {{LONG}}, "loopPauseInMilliSeconds": {{LONG}}, "label": "{{STRING}}", "originalTime": "{{STRING}}" } } }
Header parameters
Parameter | Description | Type |
---|---|---|
messageId | A unique ID used to represent a specific message. | string |
dialogRequestId | A unique ID used to correlate directives sent in response to a specific Recognize event. |
string |
Payload parameters
Parameter | Description | Type |
---|---|---|
token | An opaque token that uniquely identifies the alert. | string |
type | Identifies the alert type. If an unrecognized value is sent to your client, it should default to an ALARM .
Accepted values: TIMER , ALARM , REMINDER . |
string |
scheduledTime | Timestamp for when the alert is scheduled, in YYYY-MM-DDThh:mm:ss±hhmm ISO 8601 format.
Example value: "2018-11-28T09:34:32+0000" |
string |
assets | List containing audio assets to play for the user. | list |
assets[i].assetId | A unique identifier for the audio asset. | string |
assets[i].url | Identifies the location of the asset in the cloud for the client to download and cache. The asset URL is valid for 60 minutes after the scheduledTime . As a best practice, Amazon recommends having the client download and store any assets locally. The client is then able to play the locally downloaded asset at the scheduledTime .
|
string |
assetPlayOrder | The sequence that audio assets must be played. The list contains assetId s. Note: assetId s might appear more than one time in the list, which must all be played. If your client fails to download and cache the assets, your device should use the audio files provided by Amazon. |
list |
backgroundAlertAsset | If present, the backgroundAlertAsset value matches an assetId in the assets list. If backgroundAlertAsset is not included in the payload, default to the Amazon provided sound in the Alexa sound library for AVS, which is available to download in the Alexa Voice Service > Resources section of the Amazon developer console. |
string |
loopCount | The number of times each sequence of assets must be played. For example: If the value is 2 , your client must loop through assetPlayOrder two times.Note: If loopCount is absent from the payload, you must loop the assets for one hour, or until the user stops the alert. |
long |
loopPauseInMilliSeconds | Duration between the beginnings of each asset loop, which includes the asset rendering time. For example, if a single alarm sound has a 200-millisecond duration and loopPauseInMilliSeconds is 700 , assuming loopCount is greater than 1 , your client must render 500 milliseconds of silence between the end of one instance of the alarm sound and the beginning of the next.If the Alerts channel is sent to the background, regardless of whether the Alerts channel is actively rendering the asset or silent between loops, wait the full duration of loopPauseInMilliSeconds before rendering the background asset. If the Alerts channel regains foreground focus, begin rendering the foreground asset immediately.Note: If the loopPauseInMilliSeconds value is not specified, is set to 0 , or is shorter than the duration of the asset, there must not be any silence between asset loops. |
long |
label | A custom description label for the contents of the alert. For reminder alerts, this string represents a reminder's label. For timer alerts, this string represents a timer's name. This field isn't sent with all alerts, it's only sent if the label preexists. Examples: - Timer utterance: "Set a coffee timer for five minutes." The label is "coffee". - Reminder utterance: "Remind me to pick up kids from school at seven PM." The label is "pick up kids". |
string |
originalTime | The starting time that the alert is first set to, specified in the ISO 8601 extended format. Snoozing or deferring an alert doesn't modify this value. | string |
DeleteAlert
AVS sends a DeleteAlert
directive to the client to delete an existing alert. The client receives the DeleteAlert
directive when a user makes a speech request to cancel or delete a timer, alarm, or reminder, or deletes an existing set alert using the Amazon Alexa app.
Sample message
{ "directive": { "header": { "namespace": "Alerts", "name": "DeleteAlert", "messageId": "{{STRING}}", "dialogRequestId": "{{STRING}}" }, "payload": { "token": "{{STRING}}" } } }
Header parameters
Parameter | Description | Type |
---|---|---|
messageId | A unique ID used to represent a specific message. | string |
dialogRequestId | A unique ID used to correlate directives sent in response to a specific Recognize event. |
string |
Payload parameters
Parameter | Description | Type |
---|---|---|
token | An opaque token that uniquely identifies the alert. | string |
DeleteAlerts
The DeleteAlerts
directive instructs a client to delete all its existing alerts. A client receives the DeleteAlerts
directive when a user makes a speech request to cancel/delete all alerts. Use the tokens
array to group the identifiers for individual alerts.
- After deleting all alerts found in the
tokens
array on the client, send aDeleteAlertsSucceeded
event to AVS. - If the client is unable to actually delete any alerts found on the client that are present in the
tokens
array, send aDeleteAlertsFailed
event to AVS.
Sample message
{ "directive": { "header": { "namespace": "Alerts", "name": "DeleteAlerts", "messageId": "{{STRING}}" }, "payload": { "tokens": ["{{STRING}}",...] } } }
Header parameters
Parameter | Description | Type |
---|---|---|
messageId | A unique ID used to represent a specific message. | string |
dialogRequestId | A unique ID used to correlate directives sent in response to a specific Recognize event. |
string |
Payload parameters
Parameter | Description | Type |
---|---|---|
tokens | An array of tokens. Each token is a string that uniquely represents an alert on the product. | string |
SetVolume
The SetVolume
directive instructs a client to set the absolute volume level for an alert.
Sample message
{ "directive": { "header": { "namespace": "Alerts", "name": "SetVolume", "messageId": "{{STRING}}", "dialogRequestId": {{STRING}} }, "payload": { "volume": "{{LONG}}" } } }
Header parameters
Parameter | Description | Type |
---|---|---|
messageId | A unique ID used to represent a specific message. | string |
dialogRequestId | A unique ID used to correlate directives sent in response to a specific Recognize event. | string |
Payload parameters
Parameter | Description | Type |
---|---|---|
volume | The absolute volume level scaled from a minimum of 0 min to a maximum of 100. Accepted values: Any value between 0 and 100, inclusive. |
long |
AdjustVolume
The AdjustVolume
directive instructs a client to adjust the relative volume level of an alert.
Sample message
{ "directive": { "header": { "namespace": "Alerts", "name": "AdjustVolume", "messageId": "{{STRING}}", "dialogRequestId": {{STRING}} }, "payload": { "volume": "{{LONG}}" } } }
Header parameters
Parameter | Description | Type |
---|---|---|
messageId | A unique ID used to represent a specific message. | string |
dialogRequestId | A unique ID used to correlate directives sent in response to a specific Recognize event. | string |
Payload parameters
Parameter | Description | Type |
---|---|---|
volume | The relative volume adjustment. A positive or negative long value that increases or decreases volume in relation to the current volume setting. Accepted values: Any value between -100 and 100, inclusive. |
long |
Events
SetAlertSucceeded
Send the SetAlertSucceeded
event to AVS after receiving a SetAlert
directive and setting the alert on the client.
{ "event": { "header": { "namespace": "Alerts", "name": "SetAlertSucceeded", "messageId": "{{STRING}}" }, "payload": { "token": "{{STRING}}" } } }
Header parameters
Parameter | Description | Type |
---|---|---|
messageId | A unique ID used to represent a specific message. | string |
Payload parameters
Parameter | Description | Type |
---|---|---|
token | An opaque token provided by the SetAlert directive. |
string |
SetAlertFailed
Send the SetAlertFailed
event to AVS after receiving a SetAlert
directive and failing to set the alert on the client.
Sample message
{ "event": { "header": { "namespace": "Alerts", "name": "SetAlertFailed", "messageId": "{{STRING}}" }, "payload": { "token": "{{STRING}}" } } }
Header parameters
Parameter | Description | Type |
---|---|---|
messageId | A unique ID used to represent a specific message. | string |
Payload parameters
Parameter | Description | Type |
---|---|---|
token | An opaque token provided by the SetAlert directive. |
string |
DeleteAlertSucceeded
Send the DeleteAlertSucceeded
event to AVS after receiving a DeleteAlert
directive, and the client deletes or cancels the specified alert.
DeleteAlertSucceeded
event, please see Alerts Overview.Sample message
{ "event": { "header": { "namespace": "Alerts", "name": "DeleteAlertSucceeded", "messageId": "{{STRING}}" }, "payload": { "token": "{{STRING}}" } } }
Header parameters
Parameter | Description | Type |
---|---|---|
messageId | A unique ID used to represent a specific message. | string |
Payload parameters
Parameter | Description | Type |
---|---|---|
token | An opaque token provided by the DeleteAlert directive. |
string |
DeleteAlertFailed
Send the DeleteAlertFailed
event to AVS after the client receives a DeleteAlert
directive, but fails to delete or cancel the specified alert.
DeleteAlertFailed
event, please see Alerts Overview.Sample message
{ "event": { "header": { "namespace": "Alerts", "name": "DeleteAlertFailed", "messageId": "{{STRING}}" }, "payload": { "token": "{{STRING}}" } } }
Header parameters
Parameter | Description | Type |
---|---|---|
messageId | A unique ID used to represent a specific message. | string |
Payload parameters
Parameter | Description | Type |
---|---|---|
token | An opaque token provided by the DeleteAlert directive. |
string |
DeleteAlertsSucceeded
Send the DeleteAlertsSucceeded
event to AVS after receiving a DeleteAlerts
directive, after the client deletes or cancels all existing alerts within the tokens array.
For more information about when to send the DeleteAlertsSucceeded
event, see Alerts Overview.
Sample message
{ "event": { "header": { "namespace": "Alerts", "name": "DeleteAlertsSucceeded", "messageId": "{{STRING}}" }, "payload": { "tokens": ["{{STRING}}",...] } } }
Header parameters
Parameter | Description | Type |
---|---|---|
messageId | A unique ID used to represent a specific message. | string |
Payload parameters
Parameter | Description | Type |
---|---|---|
tokens | An array of tokens. Each token is a string that uniquely represents an alert on the client. | string |
DeleteAlertsFailed
Send a DeleteAlertsFailed
event to AVS after receiving a DeleteAlerts
directive, if the client is able to find but fails to delete or cancel at least one of the existing alerts within the tokens array.
If the client fails to delete one or more alerts, the client must rollback and send a DeleteAlertsFailed
event to Alexa. Alexa then retries the request until the client is able to delete all alerts and then sends a DeleteAlertsSucceeded
event to AVS.
DeleteAlertsFailed
event if the client is able to find one or more identifiers but is unable to actually delete them.For more information about when to send the DeleteAlertsFailed
event, see Alerts Overview.
Sample message
{ "event": { "header": { "namespace": "Alerts", "name": "DeleteAlertsFailed", "messageId": "{{STRING}}" }, "payload": { "tokens": ["{{STRING}}",...] } } }
Header parameters
Parameter | Description | Type |
---|---|---|
messageId | A unique ID used to represent a specific message. | string |
Payload parameters
Parameter | Description | Type |
---|---|---|
tokens | An array of tokens. Each token is a string that uniquely represents an alert on the product. | string |
AlertStarted
Send the AlertStarted
event to AVS when an alert starts at its scheduled time.
For more information about when to send the AlertStarted
event, see Alerts Overview.
Sample message
{ "event": { "header": { "namespace": "Alerts", "name": "AlertStarted", "messageId": "{{STRING}}" }, "payload": { "token": "{{STRING}}" } } }
Header parameters
Parameter | Description | Type |
---|---|---|
messageId | A unique ID used to represent a specific message. | string |
Payload parameters
Parameter | Description | Type |
---|---|---|
token | An opaque token provided by the SetAlert directive. |
string |
AlertStopped
Send the AlertStopped
event to AVS when an active alert ends for any of the following reasons:
- The client receives a
DeleteAlert
directive. After sending anAlertStopped
event, your client must inform AVS if it could delete the alert with either aDeleteAlertSucceeded
event orDeleteAlertFailed
event. - A user uses a physical control (hardware button or GUI) to stop the alert.
- The
loopCount
is complete, or an alert without aloopCount
has played for one hour on the client.
See Alerts Overview for more information about sending AlertStopped
.
Sample message
{ "event": { "header": { "namespace": "Alerts", "name": "AlertStopped", "messageId": "{STRING}" }, "payload": { "token": "{{STRING}}" } } }
Header parameters
Parameter | Description | Type |
---|---|---|
messageId | A unique ID used to represent a specific message. | string |
Payload parameters
Parameter | Description | Type |
---|---|---|
token | An opaque token provided by the SetAlert directive. |
string |
AlertEnteredForeground
A client sends the AlertEnteredForeground
event to AVS when an active alert enters the foreground by playing at full volume or re-enters the foreground after a concurrent interaction on the Dialog channel completes. For specific details on channel interaction, see Interaction Model.
Sample message
{ "event": { "header": { "namespace": "Alerts", "name": "AlertEnteredForeground", "messageId": "{{STRING}}" }, "payload": { "token": "{{STRING}}" } } }
Header parameters
Parameter | Description | Type |
---|---|---|
messageId | A unique ID used to represent a specific message. | string |
Payload parameters
Parameter | Description | Type |
---|---|---|
token | An opaque token provided by the SetAlert directive. |
string |
AlertEnteredBackground
The client sends the AlertEnteredBackground
event to AVS when an active alert exits the foreground by attenuating or pausing, while a concurrent interaction on the Dialog channel is occurring. For specific details on channel interaction, see Interaction Model.
Sample message
{ "event": { "header": { "namespace": "Alerts", "name": "AlertEnteredBackground", "messageId": "{{STRING}}" }, "payload": { "token": "{{STRING}}" } } }
Header parameters
Parameter | Description | Type |
---|---|---|
messageId | A unique ID used to represent a specific message. | string |
Payload parameters
Parameter | Description | Type |
---|---|---|
token | An opaque token provided in the SetAlert directive. |
string |
VolumeChanged
The client sends a VolumeChanged
event to AVS after receiving either a SetVolume
or AdjustVolume
directive.
Sample message
{ "event": { "header": { "namespace": "Alerts", "name": "VolumeChanged", "messageId": "{{STRING}}" }, "payload": { "volume": "{{LONG}}" } } }
Header parameters
Parameter | Description | Type |
---|---|---|
messageId | A unique ID used to represent a specific message. | string |
Payload parameters
Parameter | Description | Type |
---|---|---|
volume | The locally adjusted the volume on the client. Accepted values: Volume must be a value between 0 and 100, inclusive. Important: If the client supports a volume range from 0 to 10, map the local range to a range of 0 to 100. For example, when the user locally increases the volume to 8, AVS expects the volume value sent to be 80. |
long |