I am looking to write an app that receives pushed alerts from a server. I found a couple of methods to do this.
Each has its own limitations. SMS- no guarantee on arrival time. Poll may drain the battery.
Do you have a better suggestion please? Thanks very much.
Google's official answer is the Android Cloud to Device Messaging Framework (deprecated) Google Cloud Messaging(deprecated) Firebase Cloud Messaging
It will work on Android >= 2.2 (on phones that have the Play Store).