没有收到来自GCM CCS的delivery_receipt_notification

I'm trying to get a receipt from CCS, but I'm just not able to.

Here is what I'm doing:

I have a go script:

package main

import (
    "fmt"
    "github.com/brunohenrique/go-gcm/ccs"
)

var (
    user = struct {
        gcmToken string
    }{"mg0xe56LfjE:APA91bFHtHVQt85iNgyzTeDowovIGPAD_NbBjURppy1LgV9_oaM2R_9zn1fDXNuEeOoALTj7F8e8JmNPI3Md-CbbgTxdvxVrONFVfGz2dOujsaGkZjEhJcBH8sWvRNYZNIp2j2QliAEX"}
)


func main() {
    con := connect()


    // Sends a message
    con.Send(&ccs.OutMsg{
        To: user.gcmToken,
        ID: "m-1366082849205",
        Notification: map[string]interface{}{
            "title": "Hey!",
            "body": "There",
            "sound": "default",
        },
        TimeToLive: 600,
        DeliveryReceiptRequested: true,
        DelayWhileIdle: true,
    })


    // Listen to messages
    for {
        m, err := con.Receive()

        if err != nil {
            fmt.Printf(">>> Err: %+v 
", err)
        }

        go func(m *ccs.InMsg) {
            fmt.Printf(">>> InMsg: %+v 
", m)
        }(m)
    }
}

Everything seems alright when I run the script, but no receipt message back:

And this is what I'm doing when I get the notification:

Am I doing something wrong or missing something?

Not sure if you're trying this on Android or iOS, since it works for me on Android but it doesn't always work on iOS.

Delivery receipts for iOS do not work with the notification parameter in the request. I was able to get it to work for a plain data message i.e. with payload

{
  "to" : <reg id>,
  "data" : {
    "hello" : "world",
    "id" : 123
  }
}

But if I added the notification payload to the above one it didn't work.

I would assume that since a notification payload message needs to be sent via APNS there is no way for them to know whether the message was delivered or not since APNS does not return any result.

For a no notification message since it's received only when the app is in the foreground they would be able to verify if the message was delivered or not.

Thanks for trying out GCM on iOS. Unfortunately, delivery receipts are not available for display notifications on iOS at the moment.