def do_build(self): packet = self.start packet += self.identity packet += self.control packet += self.sequence packet += self.__length__ packet += str(self.__data__) packet += crc_str(packet) return packet
def do_build(self):
packet = self.start
packet += self.identity
packet += self.control
packet += self.sequence
packet += self.__length__
packet += str(self.__data__)
packet += crc_str(packet)
return packet
def __repr__(self):
if isinstance(self.__data__, C1218Request):
repr_data = repr(self.__data__)
else:
repr_data = '0x' + str(self.__data__).encode('hex')
return '<C1218Packet data=' + repr_data + ' data_len=' + str(
len(self.__data__)) + ' crc=0x' + crc_str(
self.start + self.identity + self.control + self.sequence +
self.__length__ + str(self.__data__)).encode('hex') + ' >'
def parse(data):
if len(data) < 8:
raise Exception('invalid data (size)')
if data[0] != '\xee':
raise Exception('invalid start byte')
identity = data[1]
control = ord(data[2])
sequence = data[3]
length = struct.unpack('>H', data[4:6])[0]
chksum = data[-2:]
if crc_str(data[:-2]) != chksum:
raise Exception('invalid check sum')
data = data[6:-2]
if ord(data[0]) in C1218_REQUEST_IDS:
data = C1218_REQUEST_IDS[ord(data[0])].parse(data)
frame = C1218Packet(data, control, length)
frame.identity = identity
frame.sequence = sequence
return frame
def parse(data):
if len(data) < 8:
raise Exception('invalid data (size)')
if data[0] != '\xee':
raise Exception('invalid start byte')
identity = data[1]
control = ord(data[2])
sequence = data[3]
length = struct.unpack('>H', data[4:6])[0]
chksum = data[-2:]
if crc_str(data[:-2]) != chksum:
raise Exception('invalid check sum')
data = data[6:-2]
if ord(data[0]) in C1218_REQUEST_IDS:
data = C1218_REQUEST_IDS[ord(data[0])].parse(data)
frame = C1218Packet(data, control, length)
frame.identity = identity
frame.sequence = sequence
return frame
def __repr__(self):
if isinstance(self.__data__, C1218Request):
repr_data = repr(self.__data__)
else:
repr_data = '0x' + str(self.__data__).encode('hex')
return '<C1218Packet data=' + repr_data + ' data_len=' + str(len(self.__data__)) + ' crc=0x' + crc_str(self.start + self.identity + self.control + self.sequence + self.__length__ + str(self.__data__)).encode('hex') + ' >'