Android - HTTP Push with Tomcat (servlets)

I am trying to push json data from a servlet deployed in Tomcat to my Android app.

I've already checked out the C2DM but I think it requires me to have a working internet connection because the data is pushed from Google servers.

开发者_高级运维I need the push to be available when connected to an offline network (Wi-Fi). Can this be done? Or maybe anybody can suggest me other options? Thank you very much :)

This blogpost will help.