B4J Question Firebase: Send a batch of notifications

Let the devices subscribe to same topic then send your notification by topic.

I'm using the topic as a unique identifier per user, so there won't be any users that are subscribed to a "general" topic that will send out the same notification to multiple users

You can create more topics and each user can subscribe to different topics.

If I have different topics though that I want to send out, and I want to send them all out in one api call, how would I group all of the topics/messages together?

dieterp said:

I'm using the topic as a unique identifier per user, so there won't be any users that are subscribed to a "general" topic that will send out the same notification to multiple users

Click to expand...

I think each user should subscribe to a "private" topic (unique user id) and more than one "public" topic (such as general, cats, dogs, etc)

Eg.
user id = 001
topic = 001, general, cats

user id = 002
topic = 002, general, dogs

user id = 003
topic = 003, general, dogs

dieterp said:

If I have different topics though that I want to send out, and I want to send them all out in one api call, how would I group all of the topics/messages together?

Click to expand...

I never tried to group topics but according to Firebase doc, it says that we can use condition.
Maybe in the sending tool, we can put the condition in the map.

You can include up to five topics in your conditional expression.

If things become more complicated or you have a lot of users, I think you need to figure out how to group your unique users on your server/sending tool with a database.
When the app starts, subscribe/unsubscribe topics in the background when it is necessary.

OK thanks for the detailed feedback. Let me play around with this a bit and see what I can figure out