Changelog

All these version would not be possible without a lot of work from volunteers!

We, the maintainers, are greatful for each pull requests small or big, that helps make pymodbus a better product.

Authors: contains a complete list of volunteers have contributed to each major version.

Version 3.6.8

  • Allow socket exception response with wrong length

Version 3.6.7

  • Add lock to async requests, correct logging and length calc. (FIX, not on dev)

  • test_simulator: use unused_tcp_port fixture (#2141)

  • streamline imports in Factory.py (#2140)

  • Secure testing is done with pymodbus in PR. (#2136)

  • Fix link to github in README (#2134)

  • Wildcard exception catch from pyserial. (#2125)

  • Problem with stale CI. (#2117)

  • Add connection exception to list of exceptions catpured in retries (#2113)

  • Move on_reconnect to client level (#2111)

  • Bump github stale. (#2110)

  • update package_test_tool (add 4 test scenarios) (#2107)

  • Bump dependencies. (#2108)

  • Cancel send if no connection. (#2103)

Version 3.6.6

  • Solve transport close() as not inherited method. (#2098)

  • enable mypy –check-untyped-defs (#2096)

  • Add get_expected_response_length to transaction.

  • Remove control encode in framersRemove control encode in framers. (#2095)

  • Bump codeql in CI to v3. (#2093)

  • Improve server types (#2092)

  • Remove pointless try/except (#2091)

  • Improve transport types (#2090)

  • Use explicit ValueError when called with incorrect function code (#2089)

  • update message tests (incorporate all old tests). (#2088)

  • Improve simulator type hints (#2084)

  • Cleanup dead resetFrame code (#2082)

  • integrate message.encode() into framer.buildPacket. (#2062)

  • Repair client close() (intern= is needed for ModbusProtocol). (#2080)

  • Updated Message_Parser example (#2079)

  • Fix #2069 use released repl from pypi (#2077)

  • Fix field encoding of Read File Record Response (#2075)

  • Improve simulator types (#2076)

  • Bump actions. (#2071)

Version 3.6.5

  • Update framers to ease message integration (only decode/encode) (#2064)

  • Add negtive acknowledge to modbus exceptions (#2065)

  • add Message Socket/TLS and amend tests. (#2061)

  • Improve factory types (#2060)

  • ASCII. (#2054)

  • Improve datastore documentation (#2056)

  • Improve types for messages (#2058)

  • Improve payload types (#2057)

  • Reorganize datastore inheritance (#2055)

  • Added new message (framer) raw + 100%coverage. (#2053)

  • message classes, first step (#1932)

  • Use AbstractMethod in transport. (#2051)

  • A datastore for each slave. (#2050)

  • Only run coverage in ubuntu / python 3.12 (#2049)

  • Replace lambda with functools.partial in transport. (#2047)

  • Move self.loop in transport to init() (#2046)

  • Fix decoder bug (#2045)

  • Add support for server testing in package_test_tool. (#2044)

  • DictTransactionManager -> ModbusTransactionManager (#2042)

  • eliminate redundant server_close() (#2041)

  • Remove reactive server (REPL server). (#2038)

  • Improve types for client (#2032)

  • Improve HTTP server type hints (#2035)

  • eliminate asyncio.sleep() and replace time.sleep() with a timeout (#2034)

  • Use “new” inter_byte_timeout and is_open for pyserial (#2031)

  • Add more type hints to datastore (#2028)

  • Add more framer tests, solve a couple of framer problems. (#2024)

  • Rework slow tests (use NULL_MODEM) (#1995)

  • Allow slave=0 in serial communication. (#2023)

  • Client package test tool. (#2022)

  • Add REPL documentation back with links to REPL repo (#2017)

  • Move repl to a seperate repo (#2009)

  • solve more mypy issues with client (#2013)

  • solve more mypy issues with datastore (#2010)

  • Remove useless. (#2011)

  • streamline transport tests. (#2004)

  • Improve types for REPL (#2007)

  • Specify more types in base framer (#2005)

  • Move htmlcov -> build/cov (#2003)

  • Avoid pylint complain about lambda. (#1999)

  • Improve client types (#1997)

  • Fix setblocking call (#1996)

  • Actívate warnings in pytest. (#1994)

  • Add profile option to pytest. (#1991)

  • Simplify message tests (#1990)

  • Upgrade pylint and ruff (#1989)

  • Add first architecture document. (#1988)

  • Update CONTRIBUTING.rst.

  • Return None for broadcast. (#1987)

  • Make ModbusClientMixin Generic to fix type issues for sync and async (#1980)

  • remove strange None default (#1984)

  • Fix incorrect bytearray type hint in diagnostics query (#1983)

  • Fix URL to CHANGELOG (#1979)

  • move server_hostname to be local in tls client. (#1978)

  • Parameter “strict” is and was only used for serial server/client. (#1975)

  • Removed unused parameter close_comm_on_error. (#1974)

Version 3.6.4

  • Update datastore_simulator example with client (#1967)

  • Test and correct receiving more than one packet (#1965)

  • Remove unused FifoTransactionManager. (#1966)

  • Always set exclusive serial port access. (#1964)

  • Add server/client network stub, to allow test of network packets. (#1963)

  • Combine conftest to a central file (#1962)

  • Call on_reconnect_callback. (#1959)

  • Readd ModbusBaseClient to external API.

  • Update README.rst

  • minor fix for typo and consistency (#1946)

  • More coverage. (#1947)

  • Client coverage 100%. (#1943)

  • Run coverage in CI with % check of coverage. (#1945)

  • transport 100% coverage. (#1941)

  • contrib example: TCP drainage simulator with two devices (#1936)

  • Remove “pragma no cover”. (#1935)

  • transport_serial -> serialtransport. (#1933)

  • Fix behavior after Exception response (#1931)

  • Correct expected length for udp sync client. (#1930)

Version 3.6.3

  • solve Socket_framer problem with Exception response (#1925)

  • Allow socket frames to be split in multiple packets (#1923)

  • Reset frame for serial connections.

  • Source address None not 0.0.0.0 for IPv6

  • Missing Copyright in License file

  • Correct wrong url to modbus protocol spec.

  • Fix serial port in TestComm.

Version 3.6.2

  • Set documentation to v3.6.2.

Version 3.6.1

  • Solve pypi upload error.

Version 3.6.0

  • doc: Fix a code mismatch in client.rst

  • Update README.

  • truncated duration to milliseconds

  • Update examples for current dev.

  • Ignore all remaining implicit optional (#1888)

  • docstring

  • Remove unnecessary abort() call

  • Enable RUF013 (implicit optional) (#1882)

  • Support aiohttp 3.9.0b1 (#1886)

  • Actually perform aiohttp runner teardown

  • Pin to working aiohttp (#1884)

  • Docstring typo cleanup (#1879)

  • Clean client API imports. (#1819)

  • Update issue template.

  • Eliminiate implicit optional in reconnect_delay* (#1874)

  • Split client base in sync/async version (#1878)

  • Rework host/port and listener setup (#1866)

  • use baudrate directly (#1872)

  • Eliminate more implicit optional (#1871)

  • Fix serial server args order (#1870)

  • Relax test task/thread checker. (#1867)

  • Make doc link references version dependent. (#1864)

  • Remove pre-commit (#1860)

  • Ruff reduce ignores. (#1862)

  • Bump ruff to 0.1.3 and remove ruff.toml (#1861)

  • More elegant noop. (#1859)

  • Cache (#1829)

  • Eliminate more implicit optional (#1858)

  • Ignore files downloaded by pytest (#1857)

  • Avoid malicious user path input (#1855)

  • Add more return types to transport (#1852)

  • Do not attempt to close an already-closed serial connection (#1853)

  • Fix stopbits docstring typo (#1850)

  • Convert type hints to PEP585 (#1846)

  • Eliminate even more implicit optional (#1845)

  • Eliminate more implicit optionals in client (#1844)

  • Eliminate implicit optional in transport_serial (#1843)

  • Make client type annotations compatible with async client usage (#1842)

  • Merge pull request #1838 from pymodbus-dev/ruff

  • Eliminate implicit optional in simulator (#1841)

  • eliminate implicit optional for callback_disconnected (#1840)

  • pre-commit run –all-files

  • Update exclude paths

  • Replace black with ruff

  • Use other dependency groups for ‘all’ (#1834)

  • Cleanup author/maintainer fields (#1833)

  • Consistent messages if imports fail (#1831)

  • Client/Server framer as enum. (#1822)

  • Solve relative path in examples. (#1828)

  • Eliminate implicit optional for CommParams types (#1825)

  • Add 3.12 classifier (#1826)

  • Bump actions/stale to 8.0.0 (#1824)

  • Cleanup paths included in mypy/pylint (#1823)

  • Client documentation amended and updated. (#1820)

  • Import aiohttp in way pleasing mypy. (#1818)

  • Update doc, remove md files. (#1814)

  • Bump dependencies. (#1816)

  • Solve pylint / pytest.

  • fix pylint.

  • Examples are without parent module.

  • Wrong zip of examples.

  • Serial delay (#1810)

  • Add python 3.12. (#1800)

  • Release errors (pyproject.toml changes). (#1811)

Version 3.5.4

  • Release errors (pyproject.toml changes). (#1811)

Version 3.5.3

  • Simplify transport_serial (modbus use) (#1808)

  • Reduce transport_serial (#1807)

  • Change to pyproject.toml. (#1805)

  • fixes access to asyncio loop via loop property of SerialTransport (#1804)

  • Bump aiohttp to support python 3.12. (#1802)

  • README wrong links. (#1801)

  • CI caching. (#1796)

  • Solve pylint unhappy. (#1799)

  • Clean except last 7 days. (#1798)

  • Reconect_delay == 0, do not reconnect. (#1795)

  • Update simulator.py method docstring (#1793)

  • add type to isError. (#1781)

  • Allow repr(ModbusException) to return complete information (#1779)

  • Update docs. (#1777)

Version 3.5.2

  • server tracer example. (#1773)

  • sync connect missing. (#1772)

  • simulator future problem. (#1771)

Version 3.5.1

  • Always close socket on error (reset_sock). (#1767)

  • Revert reset_socket change.

  • add close_comm_on_error to example.

  • Test long term (HomeAsistant problem). (#1765)

  • Update ruff to 0.0.287 (#1764)

  • Remove references to ModbusSerialServer.start (#1759) (#1762)

  • Readd test to get 100% coverage.

  • transport: Don’t raise a RunTimeError in ModbusProtocol.error_received() (#1758)

Version 3.5.0

  • Async retry (#1752)

  • test_client: Fix test_client_protocol_execute() (#1751)

  • Use enums for constants (#1743)

  • Local Echo Broadcast with Async Clients (#1744)

  • Fix #1746 . Return missing result (#1748)

  • Document nullmodem. (#1739)

  • Add system health check to all tests. (#1736)

  • Handle partial message in ReadDeviceInformationResponse (#1738)

  • Broadcast with Handle Local Echo (#1737)

  • transport_emulator, part II. (#1710)

  • Added file AUTHORS, to list all Volunteers. (#1734)

  • Fix #1702 and #1728 (#1733)

  • Clear retry count when success. (#1732)

  • RFC: Reduce parameters for REPL server classes (#1714)

  • retries=1, solved. (#1731)

  • Impoved the example “server_updating.py” (#1720)

  • pylint 3.11 (#1730)

  • Correct retry loop. (#1729)

  • Fix faulty not check (#1725)

  • bugfix local echo handling on sync clients (#1723)

  • Updated copyright in LICENSE.

  • Correct README pre-commit.

  • Fix custom message parsing in RTU framer (#1716)

  • Request tracer (#1715)

  • pymodbus.server: allow strings for “-p” paramter (#1713)

  • New nullmodem and transport. (#1696)

  • xdist loadscope (test is not split). (#1708)

  • Add client performance example. (#1707)

Version 3.4.1

  • Fix serial startup problems. (#1701)

  • pass source_address in tcp client. (#1700)

  • serial server use source_address[0]. (#1699)

  • Examples coverage nearly 100%. (#1694)

  • new async serial (#1681)

  • Docker is not supported (lack of maintainer). (#1693)

  • Forwarder write_coil –> write_coil. (#1691)

  • Change default source_address to (0.0.0.0, 502) (#1690)

  • Update ruff to 0.0.277 (#1689)

  • Fix dict comprehension (#1687)

  • Removed requests dependency from contrib/explain.py (#1688)

  • Fix broken test (#1685)

  • Fix readme badges (#1682)

  • Bump aiohttp from 3.8.3 to 3.8.5 (#1680)

  • pygments from 2.14.0 to 2.15.0 (#1677)

Version 3.4.0

  • Handle partial local echo. (#1675)

  • clarify handle_local_echo. (#1674)

  • async_client: add retries/reconnect. (#1672)

  • Fix 3.11 problem. (#1673)

  • Add new example simulator server/client. (#1671)

  • examples/contrib/explain.py leveraging Rapid SCADA (#1665)

  • _logger missed basicConfig. (#1670)

  • Bug fix for #1662 (#1663)

  • Bug fix for #1661 (#1664)

  • Fix typo in config.rst (#1660)

  • test action_increment. (#1659)

  • test codeql (#1655)

  • mypy complaints. (#1656)

  • Remove self.params from async client (#1640)

  • Drop test of pypy with python 3.8.

  • repair server_async.py (#1644)

  • move common framer to base. (#1639)

  • Restrict Return diag call to bytes. (#1638)

  • use slave= in diag requests. (#1636)

  • transport listen in server. (#1628)

  • CI test.

  • Integrate transport in server. (#1617)

  • fix getFrameStart for ExceptionResponse (#1627)

  • Add min/min to simulator actions.

  • Change to “sync client” in forwarder example (#1625)

  • Remove docker (lack of maintenance). (#1623)

  • Clean defaults (#1618)

  • Reduce CI log with no debug. (#1616)

  • prepare server to use transport. (#1607)

  • Fix RemoteSlaveContext (#1599)

  • Combine stale and lock. (#1608)

  • update pytest + extensions. (#1610)

  • Change version follow PEP 440. (#1609)

  • Fix regression with REPL server not listening (#1604)

  • Remove handler= for server classes. (#1602)

  • Fix write function codes (#1598)

  • transport nullmodem (#1591)

  • move test of examples to subdirectory. (#1592)

  • transport as object, not base class. (#1572)

  • Simple examples. (#1590)

  • transport_connect as bool. (#1587)

  • Prepare dev (#1588)

  • Release corrections. (#1586)

Version 3.3.2

  • Fix RemoteSlaveContext (#1599)

  • Change version follow PEP 440. (#1609)

  • Fix regression with REPL server not listening (#1604)

  • Fix write function codes (#1598)

  • Release corrections. (#1586)

Version 3.3.1

  • transport fixes and 100% test coverage. (#1580)

  • Delay self.loop until connect(). (#1579)

  • Added mechanism to determine if server did not start cleanly (#1539)

  • Proof transport reconnect works. (#1577)

  • Fix non-shared block doc in config.rst. (#1573)

Version 3.3.0

  • Stabilize windows tests. (#1567)

  • Bump mypy 1.3.0 (#1568)

  • Transport integrated in async clients. (#1541)

  • Client async corrections (due to 3.1.2) (#1565)

  • Server_async[udp], solve 3.1.1 problem. (#1564)

  • Remove ModbusTcpDiagClient. (#1560)

  • Remove old method from Python2/3 transition (#1559)

  • Switch to ruff’s version of bandit (#1557)

  • Allow reading/writing address 0 in the simulator (#1552)

  • Remove references to “defer_start”. (#1548)

  • Client more robust against faulty response. (#1547)

  • Fix missing package_data directives for simulator web (#1544)

  • Fix installation instructions (#1543)

  • Solve pytest timeout problem. (#1540)

  • DiagnosticStatus encode missing tuple check. (#1533)

  • test SparseDataStore. (#1532)

  • BinaryPayloadBuilder.to_string to BinaryPayloadBuilder.encode (#1526)

  • Adding flake8-pytest-style` to ruff (#1520)

  • Simplify version management. (#1522)

  • pylint and pre-commit autoupdate (#1519)

  • Add type hint (#1512)

  • Add action to lock issues/PR. (#1508)

  • New common transport layer. (#1492)

  • Solve serial close raise problem.

  • Remove old config values (#1503)

  • Document pymodbus.simulator. (#1502)

  • Refactor REPL server to reduce complexity (#1499)

  • Don’t catch KeyboardInterrupt twice for REPL server (#1498)

  • Refactor REPL client to reduce complexity (#1489)

  • pymodbus.server: listen on ID 1 by default (#1496)

  • Clean framer/__init__.py (#1494)

  • Duplicate transactions in UDP. (#1486)

  • clean ProcessIncommingPacket. (#1491)

  • Enable pyupgrade (U) rules in ruff (#1484)

  • clean_workflow.yaml solve parameter problem.

  • Correct wrong import in test. (#1483)

  • Implement pyflakes-simplify (#1480)

  • Test case for UDP duplicate msg issue (#1470)

  • Test of write_coil. (#1479)

  • Test reuse of client object. (#1475)

  • Comment about addressing when shared=false (#1474)

  • Remove old aliases to OSError (#1473)

  • pymodbus.simulator fixes (#1463)

  • Fix wrong error message with pymodbus console (#1456)

  • update modbusrtuframer (#1435)

  • Server multidrop test.: (#1451)

  • mypy problem ModbusResponse.

Version 3.2.2

  • Add forgotten await

Version 3.2.1

  • add missing server.start(). (#1443)

  • Don’t publish univeral (Python2 / Python 3) wheels (#1423)

  • Remove unneccesary custom LOG_LEVEL check (#1424)

  • Include py.typed in package (#1422)

Version 3.2.0

  • Add value <-> registers converter helpers. (#1413)

  • Add pre-commit config (#1406)

  • Make baud rate configurable for examples (#1410)

  • Clean __init_ and update log module. (#1411)

  • Simulator add calls functionality. (#1390)

  • Add note about not being thread safe. (#1404)

  • Update docker-publish.yml

  • Forward retry_on_empty and retries by calling transaction (#1401)

  • serial sync recv interval (#1389)

  • Add tests for writing multiple writes with a single value (#1402)

  • Enable mypy in CI (#1388)

  • Limit use of Singleton. (#1397)

  • Cleanup interfaces (#1396)

  • Add request names. (#1391)

  • Simulator, register look and feel. (#1387)

  • Fix enum for REPL server (#1384)

  • Remove unneeded attribute (#1383)

  • Fix mypy errors in reactive server (#1381)

  • remove nosec (#1379)

  • Fix type hints for http_server (#1369)

  • Merge pull request #1380 from pymodbus-dev/requirements

  • remove second client instance in async mode. (#1367)

  • Pin setuptools to prevent breakage with Version including “X” (#1373)

  • Lint and type hints for REPL (#1364)

  • Clean mixin execute (#1366)

  • Remove unused setup_commands.py. (#1362)

  • Run black on top-level files and /doc (#1361)

  • repl config path (#1359)

  • Fix NoReponse -> NoResponse (#1358)

  • Make whole main async. (#1355)

  • Fix more typing issues (#1351)

  • Test sync task (#1341)

  • Fixed text in ModbusClientMixin’s writes (#1352)

  • lint /doc (#1345)

  • Remove unused linters (#1344)

  • Allow log level as string or integer. (#1343)

  • Sync serial, clean recv. (#1340)

  • Test server task, async completed (#1318)

  • main() should be sync (#1339)

  • Bug: Fixed caused by passing wrong arg (#1336)

Version 3.1.3

  • Solve log problem in payload.

  • Fix register type check for size bigger than 3 registers (6 bytes) (#1323)

  • Re-add SQL tests. (#1329)

  • Central logging. (#1324)

  • Skip sqlAlchemy test. (#1325)

  • Solve 1319 (#1320)

Version 3.1.2

  • Update README.rst

  • Correct README link. (#1316)

  • More direct readme links for REPL (#1314)

  • Add classifier for 3.11 (#1312)

  • Update README.rst (#1313)

  • Delete ModbusCommonBlock.png (#1311)

  • Add modbus standard to README. (#1308)

  • fix no auto reconnect after close/connect in TCPclient (#1298)

  • Update examples.rst (#1307)

  • var name clarification (#1304)

  • Bump external libraries. (#1302)

  • Reorganize documentation to make it easier accessible (#1299)

  • Simulator documentation (first version). (#1296)

  • Updated datastore Simulator. (#1255)

  • Update links to pydmodbus-dev (#1291)

  • Change riptideio to pymodbus-dev. (#1292)

  • #1258 Avoid showing unit as a seperate command line argument (#1288)

  • Solve docker cache problem. (#1287)

Version 3.1.1

  • add missing server.start() (#1282)

  • small performance improvement on debug log (#1279)

  • Fix Unix sockets parsing (#1281)

  • client: Allow unix domain socket. (#1274)

  • transfer timeout to protocol object. (#1275)

  • Add ModbusUnixServer / StartAsyncUnixServer. (#1273)

  • Added return in AsyncModbusSerialClient.connect (#1271)

  • add connect() to the very first example (#1270)

  • Solve docker problem. (#1268)

  • Test stop of server task. (#1256)

Version 3.1.0

  • Add xdist pr default. (#1253)

  • Create docker-publish.yml (#1250)

  • Parallelize pytest with pytest-xdist (#1247)

  • Support Python3.11 (#1246)

  • Fix reconnectDelay to be within (100ms, 5min) (#1244)

  • Fix typos in comments (#1233)

  • WEB simulator, first version. (#1226)

  • Clean async serial problem. (#1235)

  • terminate when using ‘randomize’ and ‘change_rate’ at the same time (#1231)

  • Used tooled python and OS (#1232)

  • add ‘change_rate’ randomization option (#1229)

  • add check_ci.sh (#1225)

  • Simplify CI and use cache. (#1217)

  • Solve issue 1210, update simulator (#1211)

  • Add missing client calls in mixin.py. (#1206)

  • Advanced simulator with cross memory. (#1195)

  • AsyncModbusTcp/UdpClient honors delay_ms == 0 (#1203) (#1205)

  • Fix #1188 and some pylint issues (#1189)

  • Serial receive incomplete bytes.issue #1183 (#1185)

  • Handle echo (#1186)

  • Add updating server example. (#1176)

Version 3.0.2

  • Add pygments as requirement for repl

  • Update datastore remote to handle write requests (#1166)

  • Allow multiple servers. (#1164)

  • Fix typo. (#1162)

  • Transfer parms. to connected client. (#1161)

  • Repl enhancements 2 (#1141)

  • Server simulator with datastore with json data. (#1157)

  • Avoid unwanted reconnects (#1154)

  • Do not initialize framer twice. (#1153)

  • Allow timeout as float. (#1152)

  • Improve Docker Support (#1145)

  • Fix unreachable code in AsyncModbusTcpClient (#1151)

  • Fix type hints for port and timeout (#1147)

  • Start/stop multiple servers. (#1138)

  • Server/asyncio.py correct logging when disconnecting the socket (#1135)

  • Add Docker and container registry support (#1132)

  • Removes undue reported error when forwarding (#1134)

  • Obey timeout parameter on connection (#1131)

  • Readme typos (#1129)

  • Clean noqa directive. (#1125)

  • Add isort and activate CI fail for black/isort. (#1124)

  • Update examples. (#1117)

  • Move logging configuration behind function call (#1120)

  • serial2TCP forwarding example (#1116)

  • Make serial import dynamic. (#1114)

  • Bugfix ModbusSerialServer setup so handler is called correctly. (#1113)

  • Clean configurations. (#1111)

Version 3.0.1

  • Faulty release!

Version 3.0.0

  • Solve multiple incomming frames. (#1107)

  • Up coverage, tests are 100%. (#1098)

  • Prepare for rc1. (#1097)

  • Prepare 3.0.0dev5 (#1095)

  • Adapt serial tests. (#1094)

  • Allow windows. (#1093)

  • Remove server sync code and combine with async code. (#1092)

  • Solve test of tls by adding certificates and remove bugs (#1080)

  • Simplify server implementation. (#1071)

  • Do not filter using unit id in the received response (#1076)

  • Hex values for repl arguments (#1075)

  • All parameters in class parameter. (#1070)

  • Add len parameter to decode_bits. (#1062)

  • New combined test for all types of clients. (#1061)

  • Dev mixin client (#1056)

  • Add/update client documentation, including docstrings etc. (#1055)

  • Add unit to arguments (#1041)

  • Add timeout to all pytest. (#1037)

  • Simplify client parent classes. (#1018)

  • Clean copyright statements, to ensure we follow FOSS rules. (#1014)

  • Rectify sync/async client parameters. (#1013)

  • Clean client directory structure for async. (#1010)

  • Remove async_io, simplify AsyncModbus<x>Client. (#1009)

  • remove init_<something>_client(). (#1008)

  • Remove async factory. (#1001)

  • Remove loop parameter from client/server (#999)

  • add example async client. (#997)

  • Change async ModbusSerialClient to framer= from method=. (#994)

  • Add forwarder example with multiple slaves. (#992)

  • Remove async get_factory. (#990)

  • Remove unused ModbusAccessControl. (#989)

  • Solve problem with remote datastore. (#988)

  • Remove unused schedulers. (#976)

  • Remove twisted (#972)

  • Remove/Update tornado/twister tests. (#971)

  • remove easy_install and ez_setup (#964)

  • Fix mask write register (#961)

  • Activate pytest-asyncio. (#949)

  • Changed default framer for serial to be ModbusRtuFramer. (#948)

  • Remove tornado. (#935)

  • Pylint, check method parameter documentation. (#909)

  • Add get_response_pdu_size to mask read/write. (#922)

  • Minimum python version is 3.8. (#921)

  • Ensure make doc fails on warnings and/or errors. (#920)

  • Remove central makefile. (#916)

  • Re-organize examples (#914)

  • Documentation cleanup and clarification (#689)

  • Update doc for repl. (#910)

  • Include package and tests in coverage measurement (#912)

  • Use response byte length if available (#880)

  • better fix for rtu incomplete frames (#511)

  • Remove twisted/tornado from doc. (#904)

  • Update classifiers for pypi. (#907)

  • Documentation updates

  • PEP8 compatibale code

  • More tooling and CI updates

  • Remove python2 compatibility code (#564)

  • Remove Python2 checks and Python2 code snippets

  • Misc co-routines related fixes

  • Fix CI for python3 and remove PyPI from CI

  • Fix mask_write_register call. (#685)

  • Add support for byte strings in the device information fields (#693)

  • Catch socket going away. (#722)

  • Misc typo errors (#718)

  • Support python3.10

  • Implement asyncio ModbusSerialServer

  • ModbusTLS updates (tls handshake, default framer)

  • Support broadcast messages with asyncio client

  • Fix for lazy loading serial module with asyncio clients.

  • Updated examples and tests

  • Support python3.7 and above

  • Support creating asyncio clients from with in coroutines.

Version 2.5.3

  • Fix retries on tcp client failing randomly.

  • Fix Asyncio client timeout arg not being used.

  • Treat exception codes as valid responses

  • Fix examples (modbus_payload)

  • Add missing identity argument to async ModbusSerialServer

Version 2.5.2

  • Add kwarg reset_socket to control closing of the socket on read failures (set to True by default).

  • Add –reset-socket/–no-reset-socket to REPL client.

Version 2.5.1

  • Bug fix TCP Repl server.

  • Support multiple UID’s with REPL server.

  • Support serial for URL (sync serial client)

  • Bug fix/enhancements, close socket connections only on empty or invalid response

Version 2.5.0

  • Support response types stray and empty in repl server.

  • Minor updates in asyncio server.

  • Update reactive server to send stray response of given length.

  • Transaction manager updates on retries for empty and invalid packets.

  • Test fixes for asyncio client and transaction manager.

  • Fix sync client and processing of incomplete frames with rtu framers

  • Support synchronous diagnostic client (TCP)

  • Server updates (REPL and async)

  • Handle Memory leak in sync servers due to socketserver memory leak

  • Minor fix in documentations

  • Travis fix for Mac OSX

  • Disable unnecessary deprecation warning while using async clients.

  • Use Github actions for builds in favor of travis.

  • Documentation updates

  • Disable strict mode by default.

  • Fix ReportSlaveIdRequest request

  • Sparse datablock initialization updates.

  • Support REPL for modbus server (only python3 and asyncio)

  • Fix REPL client for write requests

  • Fix examples

  • Asyncio server

  • Asynchronous server (with custom datablock)

  • Fix version info for servers

  • Fix and enhancements to Tornado clients (seril and tcp)

  • Fix and enhancements to Asyncio client and server

  • Update Install instructions

  • Synchronous client retry on empty and error enhancments

  • Add new modbus state RETRYING

  • Support runtime response manipulations for Servers

  • Bug fixes with logging module in servers

  • Asyncio modbus serial server support

Version 2.4.0

  • Support async moduls tls server/client

  • Add local echo option

  • Add exponential backoffs on retries.

  • REPL - Support broadcasts.

  • Fix framers using wrong unit address.

  • Update documentation for serial_forwarder example

  • Fix error with rtu client for local_echo

  • Fix asyncio client not working with already running loop

  • Fix passing serial arguments to async clients

  • Support timeouts to break out of responspe await when server goes offline

  • Misc updates and bugfixes.

Version 2.3.0

  • Support Modbus TLS (client / server)

  • Distribute license with source

  • BinaryPayloadDecoder/Encoder now supports float16 on python3.6 and above

  • Fix asyncio UDP client/server

  • Minor cosmetic updates

  • Asyncio Server implementation (Python 3.7 and above only)

  • Bug fix for DiagnosticStatusResponse when odd sized response is received

  • Remove Pycrypto from dependencies and include cryptodome instead

  • Remove SIX requirement pinned to exact version.

  • Minor bug-fixes in documentations.

Version 2.2.0

  • Support Python 3.7

  • Fix to task cancellations and CRC errors for async serial clients.

  • Fix passing serial settings to asynchronous serial server.

  • Fix AttributeError when setting interCharTimeout for serial clients.

  • Provide an option to disable inter char timeouts with Modbus RTU.

  • Add support to register custom requests in clients and server instances.

  • Fix read timeout calculation in ModbusTCP.

  • Fix SQLDbcontext always returning InvalidAddress error.

  • Fix SQLDbcontext update failure

  • Fix Binary payload example for endianess.

  • Fix BinaryPayloadDecoder.to_coils and BinaryPayloadBuilder.fromCoils methods.

  • Fix tornado async serial client TypeError while processing incoming packet.

  • Fix erroneous CRC handling in Modbus RTU framer.

  • Support broadcasting in Modbus Client and Servers (sync).

  • Fix asyncio examples.

  • Improved logging in Modbus Server .

  • ReportSlaveIdRequest would fetch information from Device identity instead of hardcoded Pymodbus.

  • Fix regression introduced in 2.2.0rc2 (Modbus sync client transaction failing)

  • Minor update in factory.py, now server logs prints received request instead of only function code

Version 2.1.0

  • Fix Issues with Serial client where in partial data was read when the response size is unknown.

  • Fix Infinite sleep loop in RTU Framer.

  • Add pygments as extra requirement for repl.

  • Add support to modify modbus client attributes via repl.

  • Update modbus repl documentation.

  • More verbose logs for repl.

Version 2.0.1

  • Fix unicode decoder error with BinaryPayloadDecoder in some platforms

  • Avoid unnecessary import of deprecated modules with dependencies on twisted

Version 2.0.0

  • Async client implementation based on Tornado, Twisted and asyncio with backward compatibility support for twisted client.

  • Allow reusing existing[running] asyncio loop when creating async client based on asyncio.

  • Allow reusing address for Modbus TCP sync server.

  • Add support to install tornado as extra requirement while installing pymodbus.

  • Support Pymodbus REPL

  • Add support to python 3.7.

  • Bug fix and enhancements in examples.

  • Async client implementation based on Tornado, Twisted and asyncio

Version 1.5.2

  • Fix serial client is_socket_open method

Version 1.5.1

  • Fix device information selectors

  • Fixed behaviour of the MEI device information command as a server when an invalid object_id is provided by an external client.

  • Add support for repeated MEI device information Object IDs (client/server)

  • Added support for encoding device information when it requires more than one PDU to pack.

  • Added REPR statements for all syncchronous clients

  • Added isError method to exceptions, Any response received can be tested for success before proceeding.

  • Add examples for MEI read device information request

Version 1.5.0

  • Improve transaction speeds for sync clients (RTU/ASCII), now retry on empty happens only when retry_on_empty kwarg is passed to client during intialization

  • Fix tcp servers (sync/async) not processing requests with transaction id > 255

  • Introduce new api to check if the received response is an error or not (response.isError())

  • Move timing logic to framers so that irrespective of client, correct timing logics are followed.

  • Move framers from transaction.py to respective modules

  • Fix modbus payload builder and decoder

  • Async servers can now have an option to defer reactor.run() when using Start<Tcp/Serial/Udo>Server(…,defer_reactor_run=True)

  • Fix UDP client issue while handling MEI messages (ReadDeviceInformationRequest)

  • Add expected response lengths for WriteMultipleCoilRequest and WriteMultipleRegisterRequest

  • Fix _rtu_byte_count_pos for GetCommEventLogResponse

  • Add support for repeated MEI device information Object IDs

  • Fix struct errors while decoding stray response

  • Modbus read retries works only when empty/no message is received

  • Change test runner from nosetest to pytest

  • Fix Misc examples

Version 1.4.0

  • Bug fix Modbus TCP client reading incomplete data

  • Check for slave unit id before processing the request for serial clients

  • Bug fix serial servers with Modbus Binary Framer

  • Bug fix header size for ModbusBinaryFramer

  • Bug fix payload decoder with endian Little

  • Payload builder and decoder can now deal with the wordorder as well of 32/64 bit data.

  • Support Database slave contexts (SqlStore and RedisStore)

  • Custom handlers could be passed to Modbus TCP servers

  • Asynchronous Server could now be stopped when running on a seperate thread (StopServer)

  • Signal handlers on Asynchronous servers are now handled based on current thread

  • Registers in Database datastore could now be read from remote clients

  • Fix examples in contrib (message_parser.py/message_generator.py/remote_server_context)

  • Add new example for SqlStore and RedisStore (db store slave context)

  • Fix minor comaptibility issues with utilities.

  • Update test requirements

  • Update/Add new unit tests

  • Move twisted requirements to extra so that it is not installed by default on pymodbus installtion

Version 1.3.2

  • ModbusSerialServer could now be stopped when running on a seperate thread.

  • Fix issue with server and client where in the frame buffer had values from previous unsuccesful transaction

  • Fix response length calculation for ModbusASCII protocol

  • Fix response length calculation ReportSlaveIdResponse, DiagnosticStatusResponse

  • Fix never ending transaction case when response is received without header and CRC

  • Fix tests

Version 1.3.1

  • Recall socket recv until get a complete response

  • Register_write_message.py: Observe skip_encode option when encoding a single register request

  • Fix wrong expected response length for coils and discrete inputs

  • Fix decode errors with ReadDeviceInformationRequest and ReportSlaveIdRequest on Python3

  • Move MaskWriteRegisterRequest/MaskWriteRegisterResponse to register_write_message.py from file_message.py

  • Python3 compatible examples [WIP]

  • Misc updates with examples

  • Fix encoding problem for ReadDeviceInformationRequest method on python3

  • Fix problem with the usage of ord in python3 while cleaning up receive buffer

  • Fix struct unpack errors with BinaryPayloadDecoder on python3 - string vs bytestring error

  • Calculate expected response size for ReadWriteMultipleRegistersRequest

  • Enhancement for ModbusTcpClient, ModbusTcpClient can now accept connection timeout as one of the parameter

  • Misc updates

  • Timing improvements over MODBUS Serial interface

  • Modbus RTU use 3.5 char silence before and after transactions

  • Bug fix on FifoTransactionManager , flush stray data before transaction

  • Update repository information

  • Added ability to ignore missing slaves

  • Added ability to revert to ZeroMode

  • Passed a number of extra options through the stack

  • Fixed documenation and added a number of examples

Version 1.2.0

  • Reworking the transaction managers to be more explicit and to handle modbus RTU over TCP.

  • Adding examples for a number of unique requested use cases

  • Allow RTU framers to fail fast instead of staying at fault

  • Working on datastore saving and loading

Version 1.1.0

  • Fixing memory leak in clients and servers (removed __del__)

  • Adding the ability to override the client framers

  • Working on web page api and GUI

  • Moving examples and extra code to contrib sections

  • Adding more documentation

Version 1.0.0

  • Adding support for payload builders to form complex encoding and decoding of messages.

  • Adding BCD and binary payload builders

  • Adding support for pydev

  • Cleaning up the build tools

  • Adding a message encoding generator for testing.

  • Now passing kwargs to base of PDU so arguments can be used correctly at all levels of the protocol.

  • A number of bug fixes (see bug tracker and commit messages)