Merge pull request #13 from AlexMekkering/crc

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Fixed CRC calculation
This commit is contained in:
Nigel Dokter 2017-01-04 11:07:45 +01:00 committed by GitHub
commit 991dd09e2a
2 changed files with 41 additions and 44 deletions
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13
dsmr_parser/parsers.py
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@ -61,22 +61,19 @@ class TelegramParserV4(TelegramParser):
:raises InvalidChecksumError: :raises InvalidChecksumError:
""" """
full_telegram = ''.join(line_values) full_telegram = '\r\n'.join(line_values)
# Extract the bytes that count towards the checksum. # Extract the bytes that count towards the checksum.
checksum_contents = re.search(r'\/.+\!', full_telegram, re.DOTALL) contents = re.search(r'(\/.+\!)([0-9A-Z]{4})', full_telegram, re.DOTALL)
# Extract the hexadecimal checksum value itself. if not contents:
checksum_hex = re.search(r'((?<=\!)[0-9A-Z]{4}(?=\r\n))+', full_telegram)
if not checksum_contents or not checksum_hex:
raise ParseError( raise ParseError(
'Failed to perform CRC validation because the telegram is ' 'Failed to perform CRC validation because the telegram is '
'incomplete. The checksum and/or content values are missing.' 'incomplete. The checksum and/or content values are missing.'
) )
calculated_crc = CRC16().calculate(checksum_contents.group(0)) calculated_crc = CRC16().calculate(contents.group(1))
expected_crc = checksum_hex.group(0) expected_crc = contents.group(2)
expected_crc = int(expected_crc, base=16) expected_crc = int(expected_crc, base=16)
if calculated_crc != expected_crc: if calculated_crc != expected_crc:

72
test/test_parse_v4_2.py
View File

@ -11,43 +11,43 @@ from dsmr_parser.objects import CosemObject, MBusObject
from dsmr_parser.parsers import TelegramParser, TelegramParserV4 from dsmr_parser.parsers import TelegramParser, TelegramParserV4
TELEGRAM_V4_2 = [ TELEGRAM_V4_2 = [
'/KFM5KAIFA-METER\r\n', '/KFM5KAIFA-METER',
'\r\n', '',
'1-3:0.2.8(42)\r\n', '1-3:0.2.8(42)',
'0-0:1.0.0(161113205757W)\r\n', '0-0:1.0.0(161113205757W)',
'0-0:96.1.1(3960221976967177082151037881335713)\r\n', '0-0:96.1.1(3960221976967177082151037881335713)',
'1-0:1.8.1(001581.123*kWh)\r\n', '1-0:1.8.1(001581.123*kWh)',
'1-0:1.8.2(001435.706*kWh)\r\n', '1-0:1.8.2(001435.706*kWh)',
'1-0:2.8.1(000000.000*kWh)\r\n', '1-0:2.8.1(000000.000*kWh)',
'1-0:2.8.2(000000.000*kWh)\r\n', '1-0:2.8.2(000000.000*kWh)',
'0-0:96.14.0(0002)\r\n', '0-0:96.14.0(0002)',
'1-0:1.7.0(02.027*kW)\r\n', '1-0:1.7.0(02.027*kW)',
'1-0:2.7.0(00.000*kW)\r\n', '1-0:2.7.0(00.000*kW)',
'0-0:96.7.21(00015)\r\n', '0-0:96.7.21(00015)',
'0-0:96.7.9(00007)\r\n', '0-0:96.7.9(00007)',
'1-0:99.97.0(3)(0-0:96.7.19)(000104180320W)(0000237126*s)(000101000001W)' '1-0:99.97.0(3)(0-0:96.7.19)(000104180320W)(0000237126*s)(000101000001W)'
'(2147583646*s)(000102000003W)(2317482647*s)\r\n', '(2147583646*s)(000102000003W)(2317482647*s)',
'1-0:32.32.0(00000)\r\n', '1-0:32.32.0(00000)',
'1-0:52.32.0(00000)\r\n', '1-0:52.32.0(00000)',
'1-0:72.32.0(00000)\r\n', '1-0:72.32.0(00000)',
'1-0:32.36.0(00000)\r\n', '1-0:32.36.0(00000)',
'1-0:52.36.0(00000)\r\n', '1-0:52.36.0(00000)',
'1-0:72.36.0(00000)\r\n', '1-0:72.36.0(00000)',
'0-0:96.13.1()\r\n', '0-0:96.13.1()',
'0-0:96.13.0()\r\n', '0-0:96.13.0()',
'1-0:31.7.0(000*A)\r\n', '1-0:31.7.0(000*A)',
'1-0:51.7.0(006*A)\r\n', '1-0:51.7.0(006*A)',
'1-0:71.7.0(002*A)\r\n', '1-0:71.7.0(002*A)',
'1-0:21.7.0(00.170*kW)\r\n', '1-0:21.7.0(00.170*kW)',
'1-0:22.7.0(00.000*kW)\r\n', '1-0:22.7.0(00.000*kW)',
'1-0:41.7.0(01.247*kW)\r\n', '1-0:41.7.0(01.247*kW)',
'1-0:42.7.0(00.000*kW)\r\n', '1-0:42.7.0(00.000*kW)',
'1-0:61.7.0(00.209*kW)\r\n', '1-0:61.7.0(00.209*kW)',
'1-0:62.7.0(00.000*kW)\r\n', '1-0:62.7.0(00.000*kW)',
'0-1:24.1.0(003)\r\n', '0-1:24.1.0(003)',
'0-1:96.1.0(4819243993373755377509728609491464)\r\n', '0-1:96.1.0(4819243993373755377509728609491464)',
'0-1:24.2.1(161129200000W)(00981.443*m3)\r\n', '0-1:24.2.1(161129200000W)(00981.443*m3)',
'!6796\r\n' '!6796'
] ]