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class PGN(object):
def __init__(self, reserved_flag=False, data_page_flag=False, pdu_format=0, pdu_specific=0):
self.reserved_flag = reserved_flag
self.data_page_flag = data_page_flag
self.pdu_format = pdu_format
self.pdu_specific = pdu_specific
@property
def is_pdu1(self):
return ((self.pdu_format < 240) or self.reserved_flag or self.data_page_flag)
@property
def is_pdu2(self):
return not self.is_pdu1
@property
def is_destination_specific(self):
return self.is_pdu1
@property
def value(self):
_pgn_flags_byte = ((self.reserved_flag << 1) + self.data_page_flag)
return int("%.2x%.2x%.2x" % (_pgn_flags_byte, self.pdu_format, self.pdu_specific), 16)
@value.setter
def value(self, value):
self.reserved_flag = (value & 0x020000) >> 17
self.data_page_flag = (value & 0x010000) >> 16
self.pdu_format = (value & 0x00FF00) >> 8
self.pdu_specific = value & 0x0000FF
@staticmethod
def from_value(value):
pgn = PGN()
pgn.value = value
return pgn
def __str__(self):
retval = ""
_temp = self.value
if self.is_destination_specific:
_temp -= self.pdu_specific
retval += ("0x%.4x " % (_temp & 0xFFFF))
if self.reserved_flag:
retval += "R "
else:
retval += " "
if self.data_page_flag:
retval += "P "
else:
retval += " "
return retval
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