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Firebase Cloud Messaging XMPP protocol

This document provides a reference for the XMPP syntax used to pass messages between your app server, client apps, and Firebase Cloud Messaging (FCM). Your app server must connect to these endpoints:

// Production
fcm-xmpp.googleapis.com:5235

// Testing
fcm-xmpp.googleapis.com:5236

The available parameters and options fall into these categories:

Downstream message syntax

This section gives the syntax for sending downstream messages.

Downstream XMPP messages (JSON)

The following table lists the targets, options, and payload for XMPP JSON messages.

Table 1 Targets, options, and payload for downstream XMPP messages (JSON).

Parameter Usage Description
Target
to Optional, string

This parameter specifies the recipient of a message.

The value can be a device's registration token, a device group's notification key, or a single topic (prefi