This guide describes how to set up Firebase Cloud Messaging in your mobile and web client apps so that you can reliably receive messages.
To receive messages, your app must assign a callback to the
Firebase.Messaging.FirebaseMessaging.MessageReceived
event handler.
MessageReceived Event
By overriding assigning a callback to Firebase.Messaging.FirebaseMessaging.MessageReceived
you can perform actions based on the received message and get the message
data:
public void OnMessageReceived(object sender, Firebase.Messaging.MessageReceivedEventArgs e) {
UnityEngine.Debug.Log("From: " + e.Message.From);
UnityEngine.Debug.Log("Message ID: " + e.Message.MessageId);
}
Messages can represent different kinds of incoming data. Most commonly,
messages are sent to the app after being initiated by the developer. Messages
are also sent to your app to represent message sent events, message send error
events, and messages deleted events. These special events can be
differentiated by checking the Message::message_type field.
Messages Deleted
Sent to your app when the FCM server deletes pending messages.
Message::message_type will be "deleted_messages". Messages may be deleted
due to:
Too many messages stored on the FCM server.
This can occur when an app's servers send a bunch of non-collapsible messages to FCM servers while the device is offline.
The device hasn't connected in a long time and the app server has recently (within the last 4 weeks) sent a message to the app on that device.
It is recommended that the app do a full sync with the app server after receiving this call.
Send Event
Called when an upstream message has been successfully sent to FCM.
MessageType will be "send_event".
Send Error
Called when there was an error sending an upstream message.
MessageType will be "send_error".