How to send one to one message using Firebase Messaging

Question

I have been trying to read the official docs and guides about how to send message from one device to another. I have saved registration token of both devices in the Real Tim

Answer 1

According to the new documentation which was updated on October 2, 2018 you must send post request as below

https://fcm.googleapis.com/fcm/send
Content-Type:application/json
Authorization:key=AIzaSyZ-1u...0GBYzPu7Udno5aA //Server key

{
    "to": "sent device's registration token",
    "data": {
       "hello": "message from someone",
    }
}

To get device's registration token extend FirebaseMessagingService and override onNewToken(String token) For more info refer to doc https://firebase.google.com/docs/cloud-messaging/android/device-group