package google.firebase.fcm.connection.v1alpha1

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FCM's service to create client connections to send/receive messages.

• rpc Connect (stream UpstreamRequest, stream DownstreamResponse)

  connection_api.proto:41

  Creates a streaming connection with FCM to send messages and their respective ACKs. The client credentials need to be passed in the [gRPC Metadata](https://grpc.io/docs/guides/concepts.html#metadata). The Format of the header is: Key: "authorization" Value: "Checkin [client_id:secret]" The project's API key also needs to be sent to authorize the project. That can be set in the X-Goog-Api-Key Metadata header.

  message UpstreamRequest

  connection_api.proto:46

  Request sent to FCM from the connected client.

  • oneof request_type

    The type of request the client is making to FCM.

    • Ack ack = 1

      Message acknowledgement.

  message DownstreamResponse

  connection_api.proto:55

  Response sent to the connected client from FCM.

  • oneof response_type

    The type of response FCM is sending to the client.

    • Message message = 1

      Message sent to FCM via the [Send API](https://firebase.google.com/docs/cloud-messaging/send-message) targeting this client.

Acknowledgement to indicate a client successfully received an FCM message. If a message is not acked, FCM will continously resend the message until it expires. Duplicate delivery in this case is working as intended.

Used in: UpstreamRequest

• string message_id = 1

  Id of message being acknowledged

Message created through the [Send API](https://firebase.google.com/docs/reference/fcm/rest/v1/projects.messages#resource-message).

Used in: DownstreamResponse

• string message_id = 1

  The identifier of the message. Used to ack the message.

• optional protobuf.Timestamp create_time = 2

  Time the message was received in FCM.

• optional protobuf.Timestamp expire_time = 3

  Expiry time of the message. Currently it is always 4 weeks.

• map<string, string> data = 4

  The arbitrary payload set in the [Send API](https://firebase.google.com/docs/reference/fcm/rest/v1/projects.messages#resource-message).