text: /// <reference types="es4x" />
  // @ts-check
  
  var eb = vertx.eventBus();
  
  // Send a message every second
  
  vertx.setPeriodic(1000, function (v) {
  
    eb.send("ping-address", "ping!", function (reply, reply_err) {
      if (reply_err == null) {
        console.log("Received reply " + reply.body());
      } else {
        console.log("No reply");
      }
    });
  
  });
  