Android: Delay in Receiving message in FCM(onMessageReceived)
karsas
In Test app, I have implemented FCM for sending notification messages using
https://github.com/firebase/quickstart-android/tree/master/messaging
For testing I sent the message(8:42 PM) from firebase console using the "New Message" under Notification.
But in my emulator, I have received the message at 9:06 PM
Please let me know if there is anything to do reduce the delay.
Thank you.
Elad Nava
This could be caused by the unrealistic heartbeat intervals in Firebase Cloud Messaging.
FCM works by maintaining an idle socket connection from an Android device to Google’s servers. This is great because it barely consumes battery power (contrary to polling), and it allows the device to be woken up instantly when a message arrives.
To make sure that the connection remains active, Android will send a heartbeat every 28 minutes on mobile connection and every 15 minutes on WiFi. If the heartbeat failed, the connection has been terminated, and FCM will re-establish it and attempt to retrieve any pending push notifications. The higher the heartbeat interval, the less battery consumed and the less times the device has to be woken up from sleep.
However, this comes at a great price: the longer the heartbeat interval, the longer it takes to identify a broken socket connection. Google has not tested these intervals in real-life situations thoroughly enough before deploying FCM. The problem with these intervals is caused by network routers and mobile carriers, who disconnect idle socket connections after a few minutes of inactivity.
More info is available on my blog:
http://eladnava.com/google-cloud-messaging-extremely-unreliable/
As a workaround, please consider Pushy (https://pushy.me), a drop-in replacement for GCM/FCM which greatly improves notification speed & reliability (Full disclosure - I founded Pushy).
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