sealed trait State
import scala.concurrent.duration._
import akka.actor._

sealed trait Data
case object Initial extends State
case object Waiting extends State
case object Empty extends Data

class FSMActor extends LoggingFSM[State, Data] {
      startWith(Initial, Empty)

      when(Initial) {
        case Event("Wait", _) => goto(Waiting)
      }

      when(Waiting, stateTimeout = 5.seconds) {
        case Event("Message", _) => 
          println(self.path.name + " got message")
          stay() forMax (Duration.Inf)

        case Event(StateTimeout, _) => 
          println(self.path.name + " got StateTimeout :(")
          stay()
      }
}

val system = ActorSystem("system")
val fsm = system.actorOf(Props(new FSMActor), "fsm")
fsm ! "Wait"
fsm ! "Message"