Awesome
VertxEventBusChat
An Android chat app that uses Vert.x EventBus to broadcast messages
A port of the Chat Web app in the xamples repo. https://github.com/vert-x3/vertx-examples/blob/master/web-examples/src/main/java/io/vertx/example/web/chat/webroot/index.html
It uses the Java Client to Vert.x TCP bridge to communicate with a Vert.x TCP server.