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FCM uses XMPP

https://firebase.google.com/docs/cloud-messaging/xmpp-server...

I really like the idea of Google providing a single, efficient connection for push-notifications, but having it bundled with Firebase (and therefore with Google Play Services) is an unfriendly approach.

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XMPP is only one option for communicating with the FCM server. The most popular method is using HTTP/REST. XMPP is only needed when you have bidirectional messages - server to client app (downstream) and client app to server (upstream).

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