v3.12.1

Minor bug fixes.

• SimDevice / SimRuntime fixes. (#2871)
• No inter_frame_time check for baudrate > 38000. (#2882)
• Fix smaller bugs in test, part 2. (#2880)
• simulator startup armoring and update 3.x docs (#2877)
• Fix smaller bugs in test, part 1. (#2879)
• Update README.rst. (#2878)
• Coverage limit is 99.95% (to allow a little margin).
• Removed simulator README, due to unused.
• fix: add warning log when using internal default simulator config (#2874)
• Document simulator entrypoint in README (#2873)

pymodbus v3.12.0

This release contains a lot of smaller (but still important) bug fixes, and 2 big new items:

• SimData/SimDevice are not released and integrated. This is a modern way of defining data storage for the server.
  The old datastore classes will disappear in v4.0.0 or a bit later.
• All internal import paths are now relative.
  This allows pymodbus to be added as a subproject to your repo with your a name of your choosing, and thus making
  your project independent of which pymodbus version other shared projects use (think e.g. HomeAssistant).

We are also please to welcome 4 new contributors, who we hope will contribute more. A big thanks to all that have helped
make this release happen.

Please remember this is an Y type release (in our X.Y.Z scheme) so please remember to check API_CHANGES.RST to see if
your project needs to make small changes.

Detailed changes:

• Upgrade library versions installed by pip. (#2868)
• SimData/Device integrate in server. (#2866)
• Add bind to ModbusUdpClient. (#2867)
• Solve Zuban problem. (#2864)
• Fix wrong parameter name in function docstring. Fix set_values does not accept tuple. (#2858)
• Add context.async_get/setValues with device_id. (#2863)
• SimData/SimDevice ready for server integration. (#2857)
• Reactivate pytest coverage. (#2862)
• No blank issue template.
• Update issue templates
• Fix ReadFifoQueueResponse count (#2861)
• Limited support for multiple devices on RS485. (#2846)
• Simulator DataBlock docstring corrections (#2853)
• fix README.rst and troubleshooting (#2851)
• Solve DoS vulnerability. (#2852)
• server handle_local_echo only in comm_params. (#2847)
• di is for discrete input (#2842)
• Allow any dev_id, when requesting dev_id 0. (#2845)
• Allow response transaction_id 0. (#2844)
• Use relative import. (#2836)
• ModbusServerContext.device_ids() docstring (#2835)
• Include ModbusSequentialDataBlock into the documentation (#2833)
• Fix Modbus TCP protocol ID validation in FramerSocket (#2830)
• Remove idle_time() from sync client, which anyhow was void. (#2828)
• Correct check_ci.sh. (#2829)
• Replace mypy with zuban (#2825)
• Fix monitoring of functions (#2826)
• Improve types (#2824)
• dicts have preserved insertion order since 3.7 (#2823)
• asyncio.iscoroutinefunction() is deprecated (#2822)
• Remove pypi-alias. (#2818)

Pymodbus v3.11.4

Small maintenance release.

Most important change is that there are now full support for python 3.14 and a number of packages (like mypy) have been updated.

Pymodbus v3.11.3

A small maintenance release.

• Coverage 100% (using no cover, when needed). (#2783)
• Create pypi alias for home-assistant. (#2782)
• Bump utilities in pyproject.toml. (#2780)
• Fix pymodbus.simulator. (#2773)

Most important change is it creates an alias in pypi for the library, allowing home-assistant to overcome a version problem.

Pymodbus v3.11.2

• Clarify documentation on reconnect_delay (#2769)
• Solve CI complaints. (#2766)
• Coverage not allowed below 99.5%. (#2765)
• Test coverage global 100%. (#2764)
• Test coverage simulator 100%. (#2763)
• Test coverage server 100%. (#2760)
• Fix python3.14 deprecation. (#2759)
• Test coverage datastore 100%. (#2757)
• Context test failed due to function code overwritten. (#2758)
• Test coverage transaction 100%. (#2756)
• Test coverage pdu 100%. (#2755)
• Framer test 100%. (#2754)
• llow sub_function_code is custom PDU. (#2753)
• Generate pdu table direct. (#2752)
• Clean pdu lookup in simulator. (#2751)
• diag sub_function_code is 2 bytes. (#2750)
• Requesthandler ignore missing devices logging (#2749)
• Simplify pdu lookup. (#2745)
• Missing coma in string representation of ModbusPDU (#2748)
• Correct "install uv". (#2744)
• Suppress aiohttp missing. (#2743)
• Remove garbage bytes in serial comm. (#2741)
• Test now included python 3.14.
• Stricter types with pyright (#2731)

Remark: in the test coverage commits are a change of the ExceptionResponse PDU, which could cause problems on v3.11.1.

Pymodbus v3.11.1

• Auto debug in case of an error. (#2738)
• Remove duplicate log lines. (#2736)
• Remove unused callback in ServerRequestHandler (#2737)
• test on Python 3.14 (#2735)
• Validate address in all datastores. (#2733)
• Use asyncio.Event to deterministically ensure simulator start (#2734)
• Ignore lockfile (#2730)
• Link api_changes/changelog to README.
• Add note about semver.org.
• Datastore, add typing to set/get. (#2729)
• Move exception codes to constants. (#2728)
• Move ExceptionResponse to proper file. (#2727)
• make base frame signature match subclasses (#2726)
• Switch from venv+pip to uv (#2723)
• Cleanup CI configuration (#2724)
• Simplify code flow for broadcast requests (#2720)
• Fix serial_forwarder.py from examples/contrib (#2715)
• Remove discord. (#2714)

Pymodbus v3.11.0

v3.11.0 is actually a bug fix to v3.10.0, but since the fix causes an API change it was not possible otherwise make v3.10.1

• Correct bit handling (each byte is LSB->MSB). (#2707)
• read_input_registers docstring change count to regs (#2704)
• Add dev_id/tid check in clients (#2711)

Pymodbus v3.10.0

DO NOT USE THIS RELEASE it is broken
v3.11.0 repair the broken part.

• Raise runtimeerror if listen() fails. (#2697)
• Correct values parameter in setValues. (#2696)
• Correct return from getValues. (#2695)
• Add request fc to exceptionResponse. (#2694)
• DummyProtocol is not async (#2686)
• Handle "little" for multiple values in to_registers (#2678)
• Remove unused const. (#2676)
• Add retries to ModbusPDU class (#2672)
• Don't invoke trace_connect callback twice (#2670)
• ensure unpacking of proper length during decoding (#2664) (#2665)
• README clean-up (#2659)
• Bump coverage to 95,5% (#2658)
• Simplify response rejection. (#2657)
• Bump coverage to 93%. (#2656)
• Solve ModbusDeviceContext bug. (#2653)
• Bit handling LSB -> MSB across bytes. (#2634)
• Change slave to device_id and slave= to device_id=. (#2600)
• Remove payload. (#2524)

This release is made due to a longer delay in releasing v4.0.0 (probably end of year).

Remark, this release contains important changes for the modbus integration in Home Assistant ! The changes are tested in a custom_component modbus.

Pymodbus v3.9.2

• Reactivate simulator validate. (#2643)
• Don't bool-test explicit datastores (#2638)
• Test and hard delayed response test. (#2636)
• Update simulator doc. (#2635)
• SimData update
• Officially working towards 4.0.0

Pymodbus v3.9.1

• Correct byte order in bits. (#2631)