I am conceptualizing an Android app that sends data from one device to another (like a picture message), but because I do not have a server, I am looking into other ways of messaging. Google Cloud Messaging (GCM) seems like a good choice, since its made for Android, and is free to use, but it still requires a server to use. Is there a way around this requirement- such as running the GCM server on the app itself? Or is there a better approach to serverless messaging on Android?
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I think that will be hard to do what you want effectively without a server but you can check out Parse’s SDK. It is free to try and free up to a certain monthly limit.
The docs.
You may want to read “Sending Pushes to Channels” and “Using Advanced Targeting”.