Migration from GCM to FCM needed?

Question

Google just announced that Google Cloud Messaging is now Firebase Cloud Messaging. What does this mean for existing users of GCM and what migration (if any) are needed?

Answer 1

The cloud infrastructure will mostly remain the same, so existing GCM apps should continue to work fine. Although I haven't found any mention of a deprecation policy from Google yet, it would be unusual for Google to (and they have little reason to) break existing GCM infrastructure/SDK/code.

FCM seems like a better version of GCM, being available on multiple platforms (even web!) and simpler to setup (compare to GCM). Migration guides are available for Android and iOS