Thanks for your ideas. I made the tests and the results are:
1. My Galaxy Nexus is running Android 4.0.4
2/3. a) With the Android engine the MP3 stream is working normal, the AAC+ stream is interrupting when the display goes off...
b) With the FFMpeg engine both MP3 and AAC+ streaming are working perfect !
P.S. I will test the volume using the FFMpeg engine and I will give you the results in the next post.
Also if you need help with testing the next updates of XiiaLive - I'm selling mobile phones so I have different models around :-) .
Customer support service by UserEcho
Also the Android engine "downgrades" the AAC+ quality from 44khz to 22khz... :-(