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Firebase Cloud Messaging InvalidTimeToLive error encountered when sending messages via Firebase Cloud Messaging.

The time-to-live (TTL) value specified in the message is outside the acceptable range.

Understanding Firebase Cloud Messaging

Firebase Cloud Messaging (FCM) is a cross-platform messaging solution that allows you to reliably send messages at no cost. It enables developers to send notifications and data messages to client apps, providing a seamless way to engage users and drive app retention.

Identifying the InvalidTimeToLive Symptom

When using FCM, you might encounter the InvalidTimeToLive error. This error typically occurs when the time-to-live (TTL) value specified in your message request is not within the acceptable range. The TTL determines how long (in seconds) the message should be kept in FCM storage if the device is offline.

Understanding the InvalidTimeToLive Issue

The InvalidTimeToLive error indicates that the TTL value provided is either too low or too high. FCM requires the TTL value to be between 0 and 2,419,200 seconds (equivalent to 28 days). If the value is outside this range, FCM cannot process the message, resulting in this error.

Why TTL Matters

The TTL value is crucial because it determines how long FCM will attempt to deliver the message if the device is offline. A correct TTL ensures that messages are delivered in a timely manner without unnecessary delays or premature expiration.

Steps to Resolve the InvalidTimeToLive Error

To fix the InvalidTimeToLive error, follow these steps:

Step 1: Review Your TTL Value

Check the TTL value in your message request. Ensure that it is within the range of 0 to 2,419,200 seconds. Here is an example of setting the TTL in a JSON payload:

{
"to": "/topics/news",
"data": {
"title": "Breaking News",
"body": "Latest updates available now!"
},
"android": {
"ttl": "3600s" // 1 hour
}
}

Step 2: Adjust the TTL Value

If the TTL value is incorrect, adjust it to a valid range. For instance, if you initially set it to 3,000,000 seconds, reduce it to a maximum of 2,419,200 seconds.

Step 3: Test Your Changes

After adjusting the TTL value, test your message delivery to ensure that the error is resolved. You can use tools like Firebase's Send Message feature to verify successful message delivery.

Additional Resources

For more information on FCM and TTL settings, refer to the official Firebase Cloud Messaging Documentation. This resource provides comprehensive details on message options and best practices.

By following these steps, you should be able to resolve the InvalidTimeToLive error and ensure that your messages are delivered effectively through Firebase Cloud Messaging.

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Firebase Cloud Messaging InvalidTimeToLive error encountered when sending messages via Firebase Cloud Messaging.

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