Heartbeat Fixer for GCM is an Android application developed by MoboDev that aims to fix the issue of push notification delay. The delay is caused by the improper default GCM heartbeat interval time. This app allows users to configure the interval of GCM heartbeat, keeping the connection alive and improving the reception of notifications.

To get the most recent beta version release of this app, users can join the MoboDev App Beta Test Community. The app is open source and the source code can be found on GitHub. Users can also donate money to support the development via Google Play in-app billing.

It is worth noting that the app is free, and according to the test, the battery should not be much impacted over a day. Users who have problems or questions can send an email instead of reporting bugs as reviews.