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I have an old Android app, developed on eclipse, that use GCM for receive push messages (and a custom server that use GCM too for send push messages to app). Now i need to pass code on Android studio, so i need to keep GCM for push messaging (i'll upgrade to FCM later). Now as i can read on GCM tutorial, i need to create an app on Firebase console and do few steps for use it on my Android app. If i do it without update also my custom push server code, does both old and new app will continue receive push messages?

AL.
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giozh
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  • Possible duplicate of [What happens to older clients when you migrate an app server from GCM to FCM?](https://stackoverflow.com/questions/43016683/what-happens-to-older-clients-when-you-migrate-an-app-server-from-gcm-to-fcm) – AL. Feb 13 '18 at 18:43
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    If you're using the same project the tokens are associated with to send the messages, then the old clients should be able to receive the messages as usual. – AL. Feb 13 '18 at 18:43

1 Answers1

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You can follow official migration from here
The gcm/fcm server endpoints are changed as(change the server code according to)

gcm-http.googleapis.com/gcm/ to  fcm.googleapis.com/fcm/
gcm-xmpp.googleapis.com to fcm-xmpp.googleapis.com

You can also see in the guide that

Updating these endpoints is not strictly required, as Google will continue to support the existing GCM endpoints.

Renjith Thankachan
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