code: def play(self, start_pos=0, end_pos=0, count=0):
          
          if ( self.dev == None ): return ''
          buf = [REPORT_ID, ord('p'), 1, int(start_pos), int(end_pos), int(count), 0, 0, 0]
          return self.write(buf);
docs: Play internal color pattern
          :param start_pos: pattern line to start from
          :param end_pos: pattern line to end at 
          :param count: number of times to play, 0=play forever