Migration of FCM to GCM processus (push maximum 1000 to maximum 1)

[Léo]

Hello All,
I'm in the process of migrating push messages from FCM to GCM (https://firebase.google.com/docs/cloud-messaging/migrate-v1) and I notice that the "registration_ids" field is deprecated. This made it possible to send an array of user tokens, with a maximum of 1000 elements per array.
From now on, this field is replaced by "token" and it is a string.
Has Google really removed the ability to send a message to 1000 people simultaneously and we have to do it 1 by 1?
Thanks,
Regards

[Arthur Thompson]

Hi,

You are correct that the "registration_ids" field is deprecated. Sending via batch was not sustainable so the FCM team had to adjust how scaled messages are handled.

It is recommended that sending at scale with FCM be a mixture of sending directly to tokens in cases where the target number is small and use topics for larger user targets. You can find more on sending at scale here. Key takeaways:

- There is a 600K per minute limit on sends

- Avoiding send spikes (eg: avoid sending large amounts of messages at the top of the hour)

Good luck with the migration!

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