ethernet-gateway v0.6.1

Added

• Raspberry Pi 4+ (aarch64 Linux) build — releases now ship an
  Ethernet_Gateway-aarch64.AppImage alongside the existing
  x86_64 Linux / Windows / macOS artifacts, built on a native arm64
  runner. Two ARM-only desktop-GUI fixes make it run on the Pi's
  VideoCore/V3D GPU: the wgpu device now requests exactly the limits
  the adapter advertises (so startup no longer aborts with
  "Limit 'max_color_attachments' value 8 is better than allowed 4" or
  the equivalent for other limits), and the GUI prefers the OpenGL ES
  backend instead of the Pi's incomplete Vulkan driver (which panicked
  with "Requested feature is not available on this device").
  WGPU_BACKEND still overrides. Other platforms are unaffected.
• Punter (C1) file-transfer protocol — the protocol CCGMS /
  Novaterm / StrikeTerm speak natively on Commodore BBSes, added
  alongside XMODEM/YMODEM/ZMODEM/Kermit. Single-file C1 with the full
  two-phase (file-type then data) handshake, both block checksums
  (16-bit additive + cyclic), the "size of next block" framing, and
  the three-S/B end-off real C1 endpoints expect. Selectable in the
  telnet upload/download protocol pickers; the outbound PRG/SEQ file
  type is auto-detected from the filename. New punter_* tunables
  (block size, timeouts, retries) are editable from the telnet File
  Transfer settings menu, the web configuration page, and the desktop
  GUI, and persist to egateway.conf. The send/receive entry points
  take an open stream so a future Multi-Punter (MPP) batch wrapper can
  layer on without touching the wire code.
• Serial modem AT+PETSCII=n command — toggles PETSCII⇄ASCII
  translation on direct-TCP dials (AT+PETSCII=1 on, AT+PETSCII=0
  off) so a Commodore 64/PET dialing ATDT host:port sees readable
  text instead of raw ASCII. Set-only, in the ITU-T V.250 +
  extension namespace (&P is the pulse-dial make/break ratio on real
  Hayes modems, so it is intentionally left alone). AT+PETSCII=1
  persists the setting immediately; AT&V reports it as +PETSCII:n.
• PETSCII translation is now editable from every configuration
  surface — the per-port modem screen in the telnet/serial-console
  menu, the web configuration page, and the desktop GUI — in addition
  to the AT command. It is a per-serial-port setting saved to
  egateway.conf.
• Serial: inbound PETSCII punctuation normalizer, and the C64 PETSCII
  DEL key (0x14, INST/DEL) is accepted as a command-line backspace
  when PETSCII translation is active. +++ escape sequences are
  traced when the gateway debug trace is on.
• Persisted gateway_debug byte-trace flag, toggleable from the
  GUI/web General frame and the telnet Other Settings / Serial
  Configuration menus. Read fresh per gateway session (no restart
  needed); EGATEWAY_GATEWAY_DEBUG still forces it on. The trace now
  timestamps each input byte.
• Web protocol reference pages served by the configuration web
  server — per-protocol references (XMODEM, YMODEM, ZMODEM, Kermit, the
  Hayes AT command set, and telnet), each documenting that protocol's
  retry/recovery behavior, plus character-set and ANSI escape-sequence
  references, reachable from a new References nav entry.
• Kermit resume and locking-shift settings are now editable from
  the telnet Kermit settings menu, the web configuration page, and the
  desktop GUI (previously egateway.conf-only).
• punter_hangup_on_failure — optional drop-carrier-on-give-up for
  Punter, editable from the telnet / web / GUI Punter settings. Because
  C1 has no in-band abort, a give-up otherwise leaves the C64 hung;
  enabling this drops carrier so it sees loss-of-carrier instead.

Fixed

• AI chat: a follow-up question that merely starts with a menu command
  letter (e.g. "Quantum…") is no longer swallowed by the answer-screen
  navigation. A lone command letter still navigates; any longer line
  is sent to the model.
• Transfer retry/recovery brought to strict spec. XMODEM/YMODEM now
  NAK on a data-phase inter-block timeout (re-prompting the sender) and
  cancel with CAN×3 on a non-duplicate block-sequence error instead of
  NAK-looping; ZMODEM routes every data-phase error through one bounded
  counter that re-sends ZRPOS and resets on progress (no infinite ZRPOS
  loop on a permanently-corrupt stream); Kermit emits an Error packet
  when it gives up so the peer is told rather than left waiting.
• Punter no longer strands a peer on a failed transfer. A cancel /
  restart from the C64 side is tolerated (longer pre-transfer input
  drain), and corrupt-block recovery is bounded by its own larger round
  cap rather than quitting early and leaving the peer hung.

Changed

• Removed the duplicate Port A/B status banner from the main
  configuration menu — per-port mode is already shown under Serial
  Configuration.
• Punter bad-block cap decoupled — punter_max_bad_rounds (default
  30) bounds consecutive corrupt-block resend rounds separately from
  punter_max_retries, since a real C64 peer never caps resends and a
  low shared cap made the gateway give up first and strand it.

Security

• Updated russh 0.60.2 → 0.60.3 to clear two high-severity
  (CVSS 7.5) allocation-DoS advisories in the SSH stack:
  RUSTSEC-2026-0154 (russh unbounded 32-bit allocation) and
  RUSTSEC-2026-0153 (russh-cryptovec unchecked CryptoVec
  allocation/growth). A malicious SSH client could otherwise drive
  unbounded memory allocation on the SSH listener.