GCM and App Engine for chat application
问题 I am planning to make a chat app through which user can send and receive text and media - audio, image and video. For simplicity I decided to use app engine with GCM. Doing downstream with GCM seems to be working well (for text messages) using the example guide provided and Android Studio template. When I tried upstream I did not receive the message back. May be this is very trivial but can someone please point me to a good tutorial or book on this. Any suggestions? Used this for downstream: