text: 
  """
  unitooth - listen sub-command
  """
  
  # built-in
  import bluetooth
  
  # package
  from . import master
  
  def run(args):
      """ listen entry """
  
      print "Running listen"
      master.listen(bluetooth.RFCOMM)
      return 0
  
  def init_args(parser):
      """ initialize listen's arguments """
  
      subp = parser.add_parser("listen")
      subp.set_defaults(handler=run)
  
      return 0
  