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FCM: message for multiple registration restrictions?

According to this quote, I found:

  • registration_ids - type String array - (optional) [message recipients] Multiple registration tokens, min. 1 max 1000.

Is this the actual token limit of the device to which I can send a single message? Do posts on topics have the same limit?

ex:

{ "to": [reg_token_01, reg_token_02, ..., reg_token_1000], "priority": "high", "data": { "title": "Hi Peeps!", "message": "This is a special message for only for you... More details are available..." } }

As always, thanks for the info and direction!

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Update: for v1 it seems that registration_ids no longer supported. The use of themes is highly recommended.

Since FCM is based on the GCM core, the maximum number of registration tokens you can send using the registration_ids parameter is 1000. I am sure you saw this in the official documentation.

So, if you are still going to use the registration_ids parameter, but you need to send it more than 1000, you can follow what @Eran was in your answer here :

If you need to send the same message to more than 1000 registration identifiers, you simply divide the sending process into groups of 1000 registration identifiers. Each group will be sent in a separate request to the GCM server.

However, when it comes to those, there are no limits. It used to be, but it was canceled many years ago. I already mentioned my previous answers:

Nope. According to their blog in December 2015:

Now we are pleased to announce that they have allowed an unlimited number of free themes for your application. This means that application developers can place an unlimited number of devices in each topic and create an unlimited number of themes.

Nope. Seeing that FCM has GCM, there are no restrictions on the number of topics for any application. There used to be a 1 million limit, but it has been removed. You can refer to this Google Developers Blog .

In addition, when creating a topic in FCM, it seems that it takes a day to access it, as in this post.

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