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.

• 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.

• 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)

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)

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.

• 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

• Correct byte order in bits. (#2631)

• 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.

• 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.

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