def readpacket(self, timeout=None):
total_read = 4
initial_read = self.read(total_read)
if initial_read != []:
all_data = initial_read
if ((sys.version_info.major > 2) and (initial_read[0] == 1)) or \
((sys.version_info.major <= 2) and ord(initial_read[0]) == 1):
command = initial_read[3]
data_number = struct.unpack('<H', initial_read[1:3])[0]
if data_number > 6:
toread = abs(data_number - 6)
second_read = self.read(toread)
all_data += second_read
total_read += toread
out = second_read
else:
out = ''
suffix = self.read(2)
if len(suffix) < 2:
raise constants.Error('Packet header too short!')
sent_crc = struct.unpack('<H', suffix)[0]
local_crc = crc16.crc16(all_data, 0, total_read)
if sent_crc != local_crc:
raise constants.CrcError("readpacket Failed CRC check")
return ReadPacket(command, out)
else:
raise constants.Error('Error reading packet header!')
return None
def readpacket(self, timeout=None):
total_read = 4
try:
initial_read = self.read(total_read)
except serial.SerialException as e:
#print ('readpacket() : Exception =', e)
if sys.version_info < (3, 0):
sys.exc_clear()
return None
if initial_read != []:
all_data = initial_read
if ord(initial_read[0]) == 1:
command = initial_read[3]
data_number = struct.unpack('<H', initial_read[1:3])[0]
if data_number > 6:
toread = abs(data_number - 6)
second_read = self.read(toread)
all_data += second_read
total_read += toread
out = second_read
else:
out = ''
suffix = self.read(2)
if len(suffix) < 2:
raise constants.Error('Packet header too short!')
sent_crc = struct.unpack('<H', suffix)[0]
local_crc = crc16.crc16(all_data, 0, total_read)
if sent_crc != local_crc:
raise constants.CrcError("readpacket Failed CRC check")
num1 = total_read + 2
return ReadPacket(command, out)
else:
raise constants.Error('Error reading packet header!')
def WritePacket(self, packet):
if not packet:
raise constants.Error('Need a packet to send')
packetlen = len(packet)
if packetlen < 6 or packetlen > 1590:
raise constants.Error('Invalid packet length')
self.flush()
self.write(packet)
def WritePacket(self, packet):
if not packet:
raise constants.Error('Need a packet to send')
packetlen = len(packet)
if packetlen < 6 or packetlen > 1590:
raise constants.Error('Invalid packet length')
self.flush()
# Used encode to change string from unicode to bytes
self.write(packet.encode())
def readpacket(self, timeout=None):
total_read = 4
initial_read = self.read(total_read)
all_data = initial_read
# Removed 'ord()' from if statement below to avoid conversion to str
if initial_read[0] == 1:
command = initial_read[3]
data_number = struct.unpack('<H', initial_read[1:3])[0]
if data_number > 6:
toread = abs(data_number - 6)
second_read = self.read(toread)
# Added print() statement to visualize data in second_read
all_data += second_read
total_read += toread
out = second_read
else:
out = ''
suffix = self.read(2)
sent_crc = struct.unpack('<H', suffix)[0]
local_crc = crc16.crc16BINARY(all_data, 0, len(all_data))
if sent_crc != local_crc:
raise constants.CrcError("readpacket Failed CRC check")
num1 = total_read + 2
return ReadPacket(command, out)
else:
raise constants.Error('Error reading packet header!')
def readpacket(self, timeout=None):
total_read = 4
initial_read = self.read(total_read)
all_data = initial_read
if ord(initial_read[0]) == 1:
command = initial_read[3]
data_number = struct.unpack('<H', initial_read[1:3])[0]
if data_number > 6:
toread = abs(data_number - 6)
second_read = self.read(toread)
all_data += second_read
total_read += toread
out = second_read
else:
out = ''
suffix = self.read(2)
sent_crc = struct.unpack('<H', suffix)[0]
local_crc = crc16.crc16(all_data, 0, total_read)
if sent_crc != local_crc:
raise constants.CrcError("readpacket Failed CRC check")
num1 = total_read + 2
return ReadPacket(command, out)
else:
raise constants.Error('Error reading packet header!')
