code: def _hexvalue_to_hsv(hexvalue):
          
          h = int(hexvalue[7:10], 16) / 360
          s = int(hexvalue[10:12], 16) / 255
          v = int(hexvalue[12:14], 16) / 255
  
          return (h, s, v)
docs: Converts the hexvalue used by tuya for colour representation into
          an HSV value.
          
          Args:
              hexvalue(string): The hex representation generated by BulbDevice._rgb_to_hexvalue()