content: '*************************************************************
  '** Hello World example 
  '** Copyright (c) 2015 Roku, Inc.  All rights reserved.
  '** Use of the Roku Platform is subject to the Roku SDK Licence Agreement:
  '** https://docs.roku.com/doc/developersdk/en-us
  '*************************************************************
  
  sub Main()
    print "in showChannelSGScreen"
    'Indicate this is a Roku SceneGraph application'
    screen = CreateObject("roSGScreen")
  
    m.global = screen.getGlobalNode()
    m.global.addFields({
      event:{}
    })
  
    print m.global
  
  
  
    m.port = CreateObject("roMessagePort")
    screen.setMessagePort(m.port)
  
    'Create a scene and load /components/helloworld.xml'
    scene = screen.CreateScene("HelloWorld")
    screen.show()
  
  
  
  
    ' m.discoveryEventsManager.appContext = m.top.appContext
  
  
    payload = {}
    while(true)
      sendDiscoveryEvent(payload)
  
      ' 'msg = wait(0, m.port)
      ' 'msgType = type(msg)
      ' 'if msgType = "roSGScreenEvent"
      ' '  if msg.isScreenClosed() then return
      ' 'end if
    end while
  end sub
  
  
  
  
  function sendDiscoveryEvent(payload as dynamic) as void
  
      ' Nothing to do here
      if payload = invalid then return
  
    ' 'print "sendDiscoveryEvent"
  
      m.global.event = {
          type: constants().DISCOVERY_EVENTS.TYPE,
          timestamp: timeHelper().getRFC3339Timestamp(),
          data: payload
      }
  end function
  