code: function echoRequest(body, reply) {
    console.log("agent receive: echo,   " + JS(body))
    console.log("agent reply:   echo,   " + JS(body))
    reply(null, body)
  
    console.log("agent emit:    echoed, " + JS(body))
    Agent.emit("echoed", body)
  }
docs: --------------------------------------------------------- handle an echo request