关于AVS Alerts模块捕获闹钟状态及事件上报的技术咨询

Hey there! Let's tackle this problem step by step—capturing your alarm's state to send the required AlertStarted and AlertEnded events to AVS is totally doable, and I'll walk you through the key approaches.

1. Hook Into Alarm State Change Triggers #

First, you need to identify the exact points in your code (or system services) where the alarm starts or stops:

• Custom alarm implementation: If you built the alarm logic yourself, add direct hooks at the critical moments:
  • When the alarm reaches its scheduled time and begins ringing, call your AVS event-sending method immediately (this is your AlertStarted trigger).
  • When the user dismisses the alarm, or it times out automatically, fire the AlertEnded event right then.
• System-provided alarm services: If you're using platform tools like Android's AlarmManager or iOS's UNUserNotificationCenter, register for their callback events:
  • On Android, when your alarm's PendingIntent fires (triggering the alarm), that's your cue to send AlertStarted. When the user taps to dismiss the alarm notification, or your service stops the alarm audio, send AlertEnded.
  • On iOS, use UNUserNotificationCenterDelegate methods like didReceiveNotificationResponse to detect when the alarm is triggered or dismissed.

2. Implement AVS Event Sending Correctly #

Make sure your events follow the AVS Alerts Interface specification. Here's a quick example of what the logic might look like (pseudocode):

// Example function to send AlertStarted to AVS
function sendAlertStartedEvent(alertToken, alertType) {
  const eventPayload = {
    token: alertToken, // Unique token received from AVS when creating the alert
    type: alertType // Either "ALARM" or "TIMER"
  };

  // Send the event via your AVS client
  avsClient.sendEvent({
    namespace: "Alerts",
    name: "AlertStarted",
    payload: eventPayload
  });
}

// Corresponding AlertEnded function
function sendAlertEndedEvent(alertToken) {
  avsClient.sendEvent({
    namespace: "Alerts",
    name: "AlertEnded",
    payload: { token: alertToken }
  });
}

Important: You must use the same token that AVS returned when you initially created the alert (via the SetAlert directive)—this links the event to the correct alert in Alexa's system.

3. Handle Edge Cases #

Don't forget these critical scenarios:

• Device restarts: If your device reboots, re-register any active alarms. If the reboot happens while an alarm was supposed to be ringing, send a delayed AlertStarted event once the device is back online.
• Pre-dismissal cancellation: If the user cancels the alarm before it triggers, send an AlertDeleted event to AVS instead of AlertStarted.
• Background execution: Ensure your alarm listener or service stays active in the background (depending on your platform) so you don't miss state changes.

4. Validate with AVS Debugger #

Use the Alexa Developer Console's built-in AVS Debugger to verify that your events are being sent correctly and that Alexa is acknowledging them. This helps catch any formatting or payload issues quickly.

内容的提问来源于stack exchange，提问作者tongfangyuan