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)

pymodbus v3.9.0

• Correct bit handling internally and in API. (#2627)
• default argument ModbusSequentialDataBlock (#2622)
• Fix exception error message for decoding response (#2618)
• Expose exception_code to API. (#2615)
• Simplify ruff config (#2611)
• Documentation dont fixed. (#2605)
• sum() can operate on an Iterator directly (#2610)
• SimData update. (#2601)
• StartServer custom_functions -> custom_pdu.
• Update pyproject.toml to remove python 3.9.
• Remove validate() from datastores. (#2595)
• Python 3.9 is EOL, not supported actively. (#2596)
• correct handle_local_echo for sync client. (#2593)
• devcontainer, automatic install. (#2583)
• Don't set_result on completed futures. (#2582)
• Flush recv_buffer before each transaction write. (#2581)
• Add missing trace. (#2578)
• Update github actions. (#2579)

Remark #2627 is a very important commit, because e.g. read_coils returned the coils in a wrong order, meaning the app would misinterpret.
This is a very old, which went unnoticed for years.

pymodbus v3.8.6

• Allow id=0 and check if response.id == request.id. (#2572)

It turns out that not allowing id=0 was too restrictive, instead now requests with id=0 is allowed provided the device responds with id=0.

pymodbus v3.8.5

• New simulator is WIP, not to be used. (#2568)
• dev_id=0 no response expected (returns ExceptionResponse(0xff)). (#2567)
• New simulator datastore. (#2535)

pymodbus v3.8.4

• Parameterize string encoding in convert_to_registers and convert_from_registers (#2558)
• Fix client modbus function calls in remote by adding count as keyword argument (#2563)
• Fix exception text in ModbusPDU.validateAddress (#2551)
• Typo arround no_response_expected (#2550)
• Trace new connection in server. (#2549)
• Add trace to server.
• Update misleading DATATYPE text. (#2547)
• Fix pylint.
• Clarify server usage.
• Solve instable transaction testing. (#2538)

v3.8.3

Bug fix release, and remove the deprecated tag on payload.

The main goals have changed, please see https://pymodbus.readthedocs.io/en/latest/source/roadmap.html

For details on the payload decoder/encoder please see #2525

Changes:

• Remove deprecate from payload. (#2532)
• Add background parameter to servers. (#2529)
• Split async_io.py and simplify server start/stop. (#2528)
• Update custom_msg example to include server. (#2527)
• Move repl doc to repl repo. (#2522)
• Add API to set max until disconnect. (#2521)