code: def setUdpJoinerPort(self, portNumber):
          
          print '%s call setUdpJoinerPort' % self.port
          cmd = 'joinerport %d' % portNumber
          print cmd
          return self.__sendCommand(cmd)[0] == 'Done'
docs: set Joiner UDP Port
  
          Args:
              portNumber: Joiner UDP Port number
  
          Returns:
              True: successful to set Joiner UDP Port
              False: fail to set Joiner UDP Port