def decode(self, packet):
""" Decodes a the response
:param packet: The packet data to decode
"""
count, self.records = 1, []
self.frame = packet
########################################################
# Do not include DLE STX and DLE ETX CRC in calcualtion
########################################################
data = packet[2:-4]
#############################################
# Calculate CRC after removing escaped DLE's
#############################################
crc, = struct.unpack(">H", packet[-2:])
if utilities.checkCRC(data, crc) != True:
raise CRCException("Error in CRC : %d" % crc)
############################
# Packet Header Information
############################
self.dest, self.src, self.command, self.sts, self.transaction_id = struct.unpack(">BBBBH", data[0:6])
data = data[6:]
#####################################
# Packet data Information
# Use Little Endian format for data
#####################################
self.records = ()
if len(data) > 0:
if self.Address.subElement > 0:
elementSize = SUBELEMENT_SIZE[self.Address.fileType]
formatStr = "<" + SUBELEMENT_STRUCT[self.Address.fileType]
else:
elementSize = ELEMENT_SIZE[self.Address.fileType]
formatStr = "<" + ELEMENT_STRUCT[self.Address.fileType]
for i in range(0, len(data), elementSize):
if self.Address.bitNumber != None:
register, = struct.unpack(formatStr, data[i : i + elementSize])
if register & 2 ** self.Address.bitNumber:
self.records += (1,)
else:
self.records += (0,)
else:
if self.Address.fileType == 0x8D:
record, = struct.unpack(formatStr, data[i : i + elementSize])
size, = struct.unpack("<h", record[0:2])
newRecord = ""
for i in range(2, elementSize, 2):
newRecord += record[i + 1] + record[i]
self.records += (newRecord[0:size],)
else:
self.records += struct.unpack(formatStr, data[i : i + elementSize])
self.records = utilities.flatten(self.records)
else:
self.records = None
def decode(self, packet):
''' Decode a register request packet
:param packet: The packet to decode
'''
#############################################
# Calculate CRC after removing stx/etx words
#############################################
data = packet[2:-3]
packetCRC = packet[-2:]
if (utilities.checkCRC(data, packetCRC) != True):
raise CRCException
############################
# Packet Header Information
############################
self.dest, self.src, self.cmd, self.sts, self.transaction_id = struct.unpack(
'>BBBBH', data[0:6])
self.function, self.size = struct.unpack('>BB', packet[6:8])
data = data[8:]
###################################################
# Packet Address Information
# Note: Use Little Endian format if using 2 bytes
###################################################
self.Address.fileNumber = struct.unpack('>B', data[0])
data = data[1:]
if (self.Address.fileNumber == '\xFF'):
self.Address.fileNumber = struct.unpack('<H', data[0:2])
data = data[2:]
self.Address.fileType = struct.unpack('>B', data[0])
data = data[1:]
self.Address.eleNumber = struct.unpack('>B', data[0])
data = data[1:]
if (self.Address.eleNumber == '\xFF'):
self.Address.eleNumber = struct.unpack('<H', packet[0:2])
data = data[2:]
self.Address.subElement = struct.unpack('>B', data[0])
data = data[1:]
if (self.Address.subElement == '\xFF'):
self.Address.subElement = struct.unpack('<H', packet[0:2])
def decode(self, packet):
""" Decode a register request packet
:param packet: The packet to decode
"""
#############################################
# Calculate CRC after removing stx/etx words
#############################################
data = packet[2:-3]
packetCRC = packet[-2:]
if utilities.checkCRC(data, packetCRC) != True:
raise CRCException
############################
# Packet Header Information
############################
self.dest, self.src, self.cmd, self.sts, self.transaction_id = struct.unpack(">BBBBH", data[0:6])
self.function, self.size = struct.unpack(">BB", packet[6:8])
data = data[8:]
###################################################
# Packet Address Information
# Note: Use Little Endian format if using 2 bytes
###################################################
self.Address.fileNumber = struct.unpack(">B", data[0])
data = data[1:]
if self.Address.fileNumber == "\xFF":
self.Address.fileNumber = struct.unpack("<H", data[0:2])
data = data[2:]
self.Address.fileType = struct.unpack(">B", data[0])
data = data[1:]
self.Address.eleNumber = struct.unpack(">B", data[0])
data = data[1:]
if self.Address.eleNumber == "\xFF":
self.Address.eleNumber = struct.unpack("<H", packet[0:2])
data = data[2:]
self.Address.subElement = struct.unpack(">B", data[0])
data = data[1:]
if self.Address.subElement == "\xFF":
self.Address.subElement = struct.unpack("<H", packet[0:2])
def decode(self, packet):
''' Decodes a the response
:param packet: The packet data to decode
'''
count, self.records = 1, []
self.frame = packet
########################################################
# Do not include DLE STX and DLE ETX CRC in calcualtion
########################################################
data = packet[2:-4]
#############################################
# Calculate CRC after removing escaped DLE's
#############################################
crc, = struct.unpack('>H', packet[-2:])
if (utilities.checkCRC(data, crc) != True):
raise CRCException("Error in CRC : %d" % crc)
############################
# Packet Header Information
############################
self.dest, self.src, self.command, self.sts, self.transaction_id = struct.unpack(
'>BBBBH', data[0:6])
data = data[6:]
#####################################
# Packet data Information
# Use Little Endian format for data
#####################################
self.records = ()
if len(data) > 0:
if (self.Address.subElement > 0):
elementSize = SUBELEMENT_SIZE[self.Address.fileType]
formatStr = '<' + SUBELEMENT_STRUCT[self.Address.fileType]
else:
elementSize = ELEMENT_SIZE[self.Address.fileType]
formatStr = '<' + ELEMENT_STRUCT[self.Address.fileType]
for i in range(0, len(data), elementSize):
if (self.Address.bitNumber != None):
register, = struct.unpack(formatStr,
data[i:i + elementSize])
if (register & 2**self.Address.bitNumber):
self.records += (1, )
else:
self.records += (0, )
else:
if (self.Address.fileType == 0x8D):
record, = struct.unpack(formatStr,
data[i:i + elementSize])
size, = struct.unpack('<h', record[0:2])
newRecord = ""
for i in range(2, elementSize, 2):
newRecord += record[i + 1] + record[i]
self.records += (newRecord[0:size], )
else:
self.records += struct.unpack(formatStr,
data[i:i + elementSize])
self.records = utilities.flatten(self.records)
else:
self.records = None
