def GenerateFakeV4BData(MeterId):
Messages.ResponseMsg = GenerateV4AData(MeterId)
Messages.ResponseMsg[
Messages.ResponseV4_respKind] = Messages.RequestMsgV4ReqTypeB
Messages.ResponseMsg[Messages.CrcField] = a2b_hex(
calc_crc16(Messages.ResponseMsg[Messages.CrcCalc]))
return Messages.ResponseMsg
def GenerateV4BData(MeterId=bytearray(
b'\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30')):
if (minutesOffset > 0) or ((MeterId.decode('ascii') != myMeterId)
and not anyMeterOk):
return GenerateFakeV4BData(MeterId)
else:
Messages.ResponseMsg = GetDatabaseV4BData(MeterId)
if Messages.ResponseMsg is None:
return GenerateFakeV4BData(MeterId)
Messages.ResponseMsg[Messages.ResponseV4_meterNo] = MeterId
Messages.ResponseMsg[Messages.CrcField] = a2b_hex(
calc_crc16(Messages.ResponseMsg[Messages.CrcCalc]))
return Messages.ResponseMsg
def GenerateRandomDataTable(tableId=b'\x30\x30\x30\x30'):
Messages.ResponseMsg = bytearray(255)
Messages.ResponseMsg[Messages.RespondTable_STX] = Messages.STX
Messages.ResponseMsg[Messages.RespondTable_tableId] = tableId
Messages.ResponseMsg[
Messages.RespondTable_preamble] = Messages.RespondTablepreamble
for i in range(len(Messages.ResponseMsg[Messages.RespondTable_body])):
Messages.ResponseMsg[Messages.RespondTable_body][i] = random.randint(
0x30, 0x39)
Messages.ResponseMsg[
Messages.RespondTable_postamble] = Messages.RespondTablepostamble
Messages.ResponseMsg[Messages.CrcField] = a2b_hex(
calc_crc16(Messages.ResponseMsg[Messages.CrcCalc]))
return Messages.ResponseMsg
def GenerateV3Data(MeterId=bytearray(
b'\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30')):
Messages.ResponseMsg = bytearray(255)
# Fill the message with random digits
for i in range(len(Messages.ResponseMsg)):
Messages.ResponseMsg[i] = random.randint(0x30, 0x39)
# Put in known fields
Messages.ResponseMsg[Messages.ResponseV3_STX] = Messages.STX
Messages.ResponseMsg[Messages.ResponseV3_model] = Messages.ResponseV3model
Messages.ResponseMsg[Messages.ResponseV3_FWver] = Messages.ResponseV3FWver
Messages.ResponseMsg[Messages.ResponseV3_meterNo] = MeterId
Messages.ResponseMsg[Messages.ResponseV3_time] = makeEkmDateTime()
Messages.ResponseMsg[Messages.ResponseV3_reserved] = bytearray(
len(Messages.ResponseMsg[Messages.ResponseV3_reserved]))
Messages.ResponseMsg[
Messages.ResponseV3_postamble] = Messages.ResponseV3postamble
Messages.ResponseMsg[Messages.CrcField] = a2b_hex(
calc_crc16(Messages.ResponseMsg[Messages.CrcCalc]))
return Messages.ResponseMsg
def GenerateFakeV4AData(MeterId):
Messages.ResponseMsg = bytearray(255)
# Fill the message with random digits
for i in range(len(Messages.ResponseMsg)):
Messages.ResponseMsg[i] = random.randint(0x30, 0x39)
# Put in known fields
Messages.ResponseMsg[Messages.ResponseV4_STX] = Messages.STX
Messages.ResponseMsg[Messages.ResponseV4_model] = Messages.ResponseV4model
Messages.ResponseMsg[Messages.ResponseV3_FWver] = Messages.ResponseV4FWver
Messages.ResponseMsg[Messages.ResponseV4_meterNo] = MeterId
Messages.ResponseMsg[
Messages.ResponseV4_postamble] = Messages.ResponseV4postamble
Messages.ResponseMsg[Messages.ResponseV4_time] = makeEkmDateTime()
Messages.ResponseMsg[
Messages.ResponseV4_respKind] = Messages.RequestMsgV4ReqTypeB
Messages.ResponseMsg[Messages.ResponseV4AData_kwhDecimals] = b'\x32'
Messages.ResponseMsg[Messages.CrcField] = a2b_hex(
calc_crc16(Messages.ResponseMsg[Messages.CrcCalc]))
return Messages.ResponseMsg
def handle(self):
'''
result = conn.execute("SELECT MeterData, MeterTime FROM `"+schema+"`.`"+meterAtable +
"` WHERE ComputerTime > timestampadd(minute, -12, now()) ORDER BY idRawMeterData LIMIT 2")
for r in result:
meterData = r[0]
meterTime = r[1]
logger.debug('Meter data record from time %s is %s bytes long of class %s.' % (
meterTime, len(meterData), meterData.__class__))
sp.write(meterData)
logger.debug('Wrote meter data to serialPort.')
Messages.ResponseMsg = sp.getResponse()
logger.debug('Read %s bytes from serialPort' % len(Messages.ResponseMsg))
pass
logger.debug('Write "close" string to EKM meter.')
sp.write("0142300375")
logger.debug('Read the close string back again.')
Messages.ResponseMsg = sp.getResponse(maxBytes=5)
logger.debug('The received close string is: %s' %
Messages.ResponseMsg.encode().hex())
'''
cur_thread_name = threading.current_thread().name
logger.debug('\n\nThread: %s begins.' % cur_thread_name)
while True:
data = self.request.recv(1024)
logger.debug('%s: Handling received message: %s' %
(cur_thread_name, data))
if len(data) == 0:
logger.debug('Got empty message: close connection.')
time.sleep(1)
break
response = Messages.ResponseNak #### default response to unknown or malformed messages is NAK
if data[Messages.
RequestMsg_fixedBegin] == Messages.RequestCmdHeader:
# handle request messages
logger.debug('Handling request message.')
if (len(data) == len(Messages.RequestMsgV3)) and (
data[-3:] == Messages.RequestCmdEnding):
logger.debug('Handling V3 request message.')
response = GenerateV3Data(
data[Messages.RequestMsgV3Def_meterId])
elif (len(data) == len(Messages.RequestMsgV4)) and (
data[-3:] == Messages.RequestCmdEnding):
if data[Messages.
RequestMsgV4Def_reqType] == Messages.RequestMsgV4ReqTypeA:
logger.debug('Handling V4A request message.')
response = GenerateV4AData(
data[Messages.RequestMsgV4Def_meterId])
elif data[
Messages.
RequestMsgV4Def_reqType] == Messages.RequestMsgV4ReqTypeB:
logger.debug('Handling V4B request message.')
response = GenerateV4BData(
data[Messages.RequestMsgV4Def_meterId])
else: # Unknown data kind
logger.critical('Got unknown V4 request message.')
pass # send default ResponseNak
else: # Ill formed request message
logger.critical('Got unknown request message.')
pass # send default ResponseNak
elif data == Messages.CloseMsg: # CloseMsg doesn't have a valid CRC (looks like last byte is only part of a CRC)
# received termination code
logger.debug('Got Close message.')
# If FakeEKM was a state machine, we would set the state back to beginning.
continue # Don't respond; DON'T close connection
elif data[Messages.CrcField] != a2b_hex(
calc_crc16(data[Messages.CrcCalc])
): # Crc must be correct for all other messages
logger.warning('Got message with incorrect CRC.')
logger.info('Message CRC: %s, calc CRC is: %s' %
(data[Messages.CrcField],
a2b_hex(calc_crc16(data[Messages.CrcCalc]))))
pass # send default ResponseNak
elif data[Messages.
SendPasswordMsg_preamble] == Messages.SendPasswordMsg[
Messages.SendPasswordMsg_preamble]:
logger.debug('Got Password message.')
response = Messages.ResponseAck # Any password is ok
elif data[Messages.
SetCmdHeader_discriminator] == Messages.SetCmdHeader:
logger.debug('Got Set command.')
response = Messages.ResponseAck # swallow all set commands without doing anything
elif data[Messages.
ReadCmdHeader_discriminator] == Messages.ReadCmdHeader:
logger.debug('Got Read request.')
response = GenerateRandomDataTable(
data[Messages.ReadTableMsg_tableId])
else:
logger.warning('Got unrecognized message.')
pass
logger.debug('Sending response: %s' % response)
self.request.sendall(response)