Exponential backoff for C2DM registration does not work! #163

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fergalmoran · 2025-08-09T16:59:15Z

fergalmoran commented

2025-08-09 16:59:15 +00:00

Originally created by @GoogleCodeExporter on 1/3/2016

In the class C2DMBaseReceiver in the method handleRegistration

The retry code supplied is **WRONG**! 

The am.set method takes in the time since bootup in milliseconds that the the 
intent should fire at. We are passing in 30000, 60000, 120000 etc. All these 
values will be WELL in the past. What we should pass in is:

    am.set(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime() + backoffTimeMs,
                            retryPIntent);

This means we are saying the next intent should be fired at now + 
backOffTimeMs. This is the first bug in the published code.

The second bug is that there is no BroadcastReceiver that is wired up to 
receive the 

com.google.android.c2dm.intent.RETRY

intent!

So, we include the following addition in the manifest file:

    <receiver android:name="com.google.android.c2dm.C2DMBroadcastReceiver">
        <intent-filter>
                 <action android:name="com.google.android.c2dm.intent.RETRY"/>
                 <category android:name="io.modem" />
              </intent-filter>
    </receiver>

(this is an additional block, leave all other things as is)

And there you go! It will start working!

Original issue reported on code.google.com by varun.ch...@gmail.com on 5 Oct 2011 at 6:50

*Originally created by @GoogleCodeExporter on 1/3/2016* ``` In the class C2DMBaseReceiver in the method handleRegistration The retry code supplied is **WRONG**! The am.set method takes in the time since bootup in milliseconds that the the intent should fire at. We are passing in 30000, 60000, 120000 etc. All these values will be WELL in the past. What we should pass in is: am.set(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime() + backoffTimeMs, retryPIntent); This means we are saying the next intent should be fired at now + backOffTimeMs. This is the first bug in the published code. The second bug is that there is no BroadcastReceiver that is wired up to receive the com.google.android.c2dm.intent.RETRY intent! So, we include the following addition in the manifest file: <receiver android:name="com.google.android.c2dm.C2DMBroadcastReceiver"> <intent-filter> <action android:name="com.google.android.c2dm.intent.RETRY"/> <category android:name="io.modem" /> </intent-filter> </receiver> (this is an additional block, leave all other things as is) And there you go! It will start working! ``` Original issue reported on code.google.com by `varun.ch...@gmail.com` on 5 Oct 2011 at 6:50

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Reference: fergalmoran/chrometophone#163