Firebase Cloud Messaging InvalidPriority error encountered when sending messages through Firebase Cloud Messaging.

The message priority is set to an invalid value.

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 is used to send notifications and data messages to client apps, enabling real-time communication between servers and client devices.

Identifying the InvalidPriority Symptom

When using FCM, you might encounter an error message stating InvalidPriority. This error typically occurs when attempting to send a message with an incorrect priority level.

What You Might Observe

Developers may notice that messages are not being delivered as expected, and upon checking the logs, the InvalidPriority error is displayed.

Exploring the InvalidPriority Issue

The InvalidPriority error arises when the priority of a message is set to a value that is not recognized by FCM. FCM supports two priority levels: normal and high. Any deviation from these values will result in this error.

Why Priority Matters

Setting the correct priority is crucial as it determines the delivery speed and conditions under which the message is sent. For more information on message priorities, refer to the Firebase documentation.

Steps to Resolve the InvalidPriority Error

To fix the InvalidPriority error, follow these steps:

  1. Review the code where the FCM message is being constructed.
  2. Locate the section where the priority is set. It might look something like this:

{
"to": "/topics/news",
"priority": "urgent",
"notification": {
"title": "Breaking News",
"body": "Stay tuned for more updates."
}
}

  1. Change the priority value to either normal or high. For example:

{
"to": "/topics/news",
"priority": "high",
"notification": {
"title": "Breaking News",
"body": "Stay tuned for more updates."
}
}

  1. Save the changes and redeploy your application.
  2. Test the message delivery to ensure the error is resolved.

Conclusion

By ensuring that the message priority is set to a valid value, you can avoid the InvalidPriority error and ensure that your messages are delivered as intended. For further reading, check out the Firebase Cloud Messaging guide.

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