modtop v0.1.2

Fixed

• RTU: a late answer to a request that had timed out was taken as the
  answer to the next request, shifting every following value by one
  address while showing them as valid. After a timeout or a bad frame,
  the line is now drained before the next request, and the receive loop
  no longer reads past the expected frame.
• TCP: a timeout in the middle of a frame no longer leaves the connection
  out of sync; it is closed and reopened.
• The address ambiguity error now gives the 6-digit Modicon form of the
  address, so following it reads the intended register.
• A serial path that is not a serial device (e.g. /dev/null) is reported
  as such instead of as a port in use.
• ttyUSB0 without /dev/ is a usage error suggesting the full path.
• Without a terminal, modtop stops before connecting with a clear message.

Changed

• -u accepts 0–255 on Modbus TCP (255 is the value recommended for a
  server addressed directly); RTU keeps 1–247.

modtop v0.1.1

Added

• Container image on the GitHub Container Registry
  (ghcr.io/hitoshyamamoto/modtop, linux/amd64, arm64, arm/v7) for Modbus
  TCP use, built from the release binaries and with a provenance
  attestation.
• go install github.com/hitoshyamamoto/modtop/cmd/modtop@<version> now
  reports the right version in modtop --version.
• Documentation: quick start, architecture, assurance case, security model,
  roadmap, governance roles, and how to reproduce a release.
• Version tags are signed (SSH key in .github/allowed_signers).

Changed

• Contributions require a Developer Certificate of Origin sign-off
  (git commit -s), checked in CI.

Fixed

• Release binaries are built from a clean working tree, so they record
  vcs.modified=false and can be reproduced from the tagged source.

modtop v0.1.0

First version.

Added

• Live view of one range of up to 250 consecutive addresses of one device,
  over Modbus TCP or Modbus RTU (Linux: amd64, arm64, armv7).
• Read functions FC01–FC04 only; no write function exists in the code.
• Address notations Modicon (5 and 6 digits), base 1 and base 0, with
  the translation of the selected address to table, function and wire
  address. Base 0/base 1 input that looks like a Modicon address is
  refused.
• Per-row types uint16, int16, uint32, int32, float32 (bool for bit
  tables) and byte orders ABCD, CDAB, BADC, DCBA, chosen during the
  session; the selected pair is shown in all four orders.
• Frames panel with the last 200 raw frames and exceptions explained.
• Block reads with automatic fallback to one register per request on
  exception 02; --single.
• Stale values always shown with their age and reason; connection health
  indicator.
• Serial port protection: refuses a port used by another process
  (/proc scan, UUCP lock files, flock, TIOCEXCL); --force-port.
• Clean exit and terminal restoration on q, Ctrl+C, SIGTERM, SIGHUP and
  internal errors.
• Release binaries with SHA-256 checksums and build provenance
  attestations.