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Is there any constraints about number of different topics for Firebase Cloud Messaging in one app?
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Based on the publish/subscribe model, FCM topic messaging allows you to send a message to multiple devices that have opted in to a particular topic. You compose topic messages as needed, and FCM handles routing and delivering the message reliably to the right devices.
The Firebase Cloud Messaging Data API lets you retrieve information that can help you understand the outcomes of message requests targeted to Android applications. The API provides aggregated data across all data collection-enabled Android devices in a project.
Nope. Seeing that FCM has GCM as its core, there is no limit in the number of Topics for any app. There used to be a 1 million limit, but it was removed. You can refer to this Google Developers Blog for that.
Also, when creating a Topic in FCM, it could take up to 24 hours for it to be show up in the Firebase Console, as per this post. Cheers! :D
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No I don't think so!
Based on the publish/subscribe model, topic messaging supports unlimited subscriptions for each app. You compose topic messages as needed, and Firebase handles message routing and delivering the message reliably to the right devices. link
Seems like you can create topics when you need them!
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