Question on EMS 1.7
1. As long as your publisher can push RTMP/RTSP H.264/AAC streams to an EMS server, your workflow should still work with EMS.
2. Sorry, you will have to do research and/or evaluate that yourself.
3. If your Android app can push RTMP/RTSP H.264/AAC streams to EMS, you can integrate it with the EMS.
4. Currently, webRTC on EMS only streams directly to viewers.