v0.1.1

Changelog

All notable changes to anymodbus are documented here.

The format follows Keep a Changelog, and
the project adheres to Semantic Versioning.

Unreleased

0.1.1 - 2026-04-26

First post-release polish, driven by the REVIEW.md notes against v0.1.0
ahead of the first downstream consumers (watlowlib + planned alicatlib /
sartoriuslib). The package is still alpha; backwards-compatibility shims
were not kept.

Added

• RegisterType enum (int16 / uint16 / int32 / uint32 / int64 /
  uint64 / float32 / float64 / string) and a type-dispatched
  decode(words, *, type=RegisterType.X, ...) / encode(value, *, type=RegisterType.X, ...) pair in anymodbus.decoders. Recommended
  entry point for downstream device libraries that load a register schema
  from configuration. register_count_for(type) helper for schema callers.
• New per-type helpers: decode_int16 / encode_int16, decode_int64 /
  encode_int64, decode_float64 / encode_float64.
• decode_string / encode_string gained a byte_order keyword for
  devices that store strings byte-swapped within each register.
  encode_string now accepts either register_count or byte_count —
  the latter is convenient for spec'd-in-bytes fields whose length isn't
  a multiple of two.
• Slave.read_string / Slave.write_string (and their sync mirrors)
  accept either register_count or byte_count, plus byte_order.
• FC short alias for FunctionCode at the top-level package surface,
  fulfilling the long-standing docstring promise.

Changed

• TimingConfig.inter_char_timeout renamed to TimingConfig.inter_char_idle
  to match the spec term used throughout DESIGN.md. The framer's keyword
  argument is renamed to match.
• ModbusUnknownExceptionError is now a subclass of
  ModbusExceptionResponse, so callers wanting "any slave-returned
  exception" can except ModbusExceptionResponse and be done. The raw
  byte is exposed on exception_code (was: code). code_to_exception
  now returns ModbusExceptionResponse instead of ModbusError.

Removed

• BusBusyError from DESIGN.md — it was documented but never
  implemented. The bus lock serializes transactions; the right
  resource-busy signal already comes from anyio.BusyResourceError on
  the underlying stream.

0.1.0 - 2026-04-25

Initial release. See DESIGN.md for the full plan.

Added

• Repository skeleton: pyproject.toml, Makefile, CI/docs/publish workflows,
  pre-commit config, src/tests/docs layout.
• Foundational pure-Python pieces:
  anymodbus._types (enums + small dataclasses),
  anymodbus.exceptions (full ModbusError tree + code_to_exception translator),
  anymodbus.crc (CRC-16/Modbus, 256-entry table),
  anymodbus.config (frozen dataclasses with validation).
• WordOrder and ByteOrder named enums for 32-bit value layout, with
  defaults matching the Modbus Application Protocol spec example
  (high-word-first, big-endian within word).
• Bus (half-duplex single-master client) and per-slave Slave handle, with
  open_modbus_rtu(...) convenience opener over anyserial.
• Length-aware RTU Framer with timing-gap fallback for unknown function codes
  and tx-side 3.5-character pre-tx idle gap.
• PDU encode/decode for the v0.1 function code set (FC 1–6, 15, 16) and
  decoders for 32-bit float / int values across two registers.
• Capability model (SUPPORTED/UNSUPPORTED/UNKNOWN) populated from probe
  results.
• Sync wrapper (anymodbus.sync) using the same shared-portal pattern as
  anyserial.sync.
• anymodbus.testing with MockSlave, FaultPlan, and client_slave_pair()
  for hardware-free integration tests.