def encode(self, encoder):
encoder.encode_str(DL645_HEAD)
encoder.encode_str(self.address[::-1])
encoder.encode_str(DL645_HEAD)
encoder.encode_byte(self.cmd)
if self.cmd == 0x11:
did_data = encoder.object2data(self.did_unit)
encoder.encode_byte(len(did_data))
did_data = data_encrypt(did_data)
encoder.encode_str(did_data)
elif self.cmd == 0x13:
encoder.encode_byte(0x00)
encoder.encode_byte(checksum(encoder.get_data()))
encoder.encode_str(DL645_TAIL)
def encode(self, encoder):
self.padding_address()
# encoder.encode_byte(0xfe)
# encoder.encode_byte(0xfe)
# encoder.encode_byte(0xfe)
# encoder.encode_byte(0xfe)
a_encoder = BinaryEncoder()
a_encoder.encode_str(CJT188_HEAD)
a_encoder.encode_byte(self.meter_type)
a_encoder.encode_str(self.address[::-1])
a_encoder.encode_byte(self.cmd)
length = len(a_encoder.object2data(self.did_unit))
a_encoder.encode_byte(length)
self.did_unit.serial = self.serial
a_encoder.encode_object(self.did_unit)
a_encoder.encode_byte(checksum(a_encoder.get_data()))
a_encoder.encode_str(CJT188_TAIL)
encoder.encode_str(a_encoder.get_data())
def find_frame_in_buff(data):
"""
>>> receive_str =" fe fe 68 11 11 11 11 11 11 68 01 02 43 C3 3F 16 "
>>> receive_data = hexstr2str(receive_str)
>>> protocol = DL645Protocol()
>>> protocol.find_frame_in_buff(receive_data)
(True, 2, 14)
>>> receive_data = hexstr2str("68 10 01 02 03 04 05 ")
>>> protocol.find_frame_in_buff(receive_data)
(False, 0, 0)
"""
start_pos = 0
found = 0
while start_pos < (len(data) - 11):
start_pos = find_head(data, start_pos, DL645_HEAD)
if start_pos == -1:
break
frame_data = data[start_pos:]
if len(frame_data) < 10:
break
data_len = ord(frame_data[9])
if data_len + 12 > len(frame_data):
start_pos += 1
continue
if ord(frame_data[10 + data_len]) != checksum(
frame_data[0:data_len + 10]):
start_pos += 1
continue
if frame_data[11 + data_len] != DL645_TAIL:
start_pos += 1
continue
found = 1
break
if found:
return True, start_pos, data_len + 12
else:
return False, 0, 0
def find_frame_in_buff(data):
"""
>>> receive_str = "00 00 00 00 FE FE FE FE FE FE "
>>> receive_str+="68 10 01 02 03 04 05 06 07 81 16 90 1F 96 00 55 55 05 2C 00 55 55 05 2C 00 00 00 00 00 00 00 00 00 26 16"
>>> receive_data = hexstr2str(receive_str)
>>> protocol = CJT188Protocol()
>>> protocol.find_frame_in_buff(receive_data)
(True, 10, 35)
>>> receive_data = hexstr2str("68 10 01 02 03 04 05 ")
>>> protocol.find_frame_in_buff(receive_data)
(False, 0, 0)
"""
start_pos = 0
found = 0
while start_pos < (len(data) - 11):
start_pos = find_head(data, start_pos, CJT188_HEAD)
if start_pos == -1:
break
frame_data = data[start_pos:]
if len(frame_data) < 11:
break
data_len = ord(frame_data[10])
if data_len + 13 > len(frame_data):
start_pos += 1
continue
if ord(frame_data[11 + data_len]) != checksum(
frame_data[0:data_len + 11]):
start_pos += 1
continue
if frame_data[12 + data_len] != CJT188_TAIL:
start_pos += 1
continue
found = 1
break
if found:
return True, start_pos, data_len + 13
else:
return False, 0, 0
# Conexión de socket TCP y se habilita el socket UDP del cliente
try:
tpc_client.connect((server, tcp_port))
udp_client.bind((client, udp_port))
except socket.error as error:
print(
f'ERROR: no se pudo establecer una conexión con el servidor [{error} in {timeout} seg]'
)
udp_client.close()
exit()
except OverflowError as error:
print(f'ERROR: puerto definido fuera de rango [{error}]')
udp_client.close()
exit()
# Flujo de comunicación con el servidor
try:
helloiam(tpc_client, user_name)
msgLength = int(msglen(tpc_client))
msg = givememsg(tpc_client, udp_client, udp_port, msgLength)
checksum(tpc_client, msg)
bye(tpc_client)
except ValueError as error:
print(error)
except socket.timeout as error:
print(
f'ERROR: no se pudo establecer la conexión en el tiempo definido por defecto [{error} in {timeout}]'
)
finally:
udp_client.close()