I've implemented GAv3 in my app for Android as it described in official tutorial. I'm getting the following warnings in logcat:
W/GAV3 ( 3031): Thread[GAThread,5,main]: Service unavailable (code=1), will retry.
I/GAV3 ( 3031): Thread[GAThread,5,main]: No campaign data found.
W/GAV3 ( 3031): Thread[Service Reconnect,5,main]: Service unavailable (code=1), using local store.
There is high-speed internet access, tracking id is set properly. And I see no statistics for my devices. Tested on Android 2.3 and 4.3.1.
I get this error message as well in my app, but Google Analytics works fine, I can see all the expected statistics from my app.
I haven't been able to figure out what the message means, but at least that is not the reason why you don't get any data in Google Analytics.
One thing to keep in mind, is that you don't really see anything useful in Google Analytics untill the day after the events happen. This makes it quite difficult to debug errors.