Archived from the old WioL1Pro-CVHBuild repository (first published 2026-08-06). These are the Wio Tracker L1 Pro builds from before Cairn; current builds are in the latest Cairn release.

Changelog

Notable changes in this fork of MeshCore, targeting the
Seeed Wio Tracker L1 Pro (nRF52840, SH1106 128×64 OLED, joystick, buzzer, L76K GNSS).

Based on upstream MeshCore v1.16.0 (companion). Format follows
Keep a Changelog. This fork versions by build number —
CVHBuild N, shown on the splash screen — so a device can be matched to a tag from its own display.

Build environments:

cvhbuild-v47 — 2026-08-06

First tagged release. Everything below is relative to upstream v1.16.0.

Added

Display & text

• UTF-8 text folding for the CP437 bitmap fonts, replacing the previous
  "every non-ASCII byte becomes a solid block" behaviour. Typographic punctuation folds to
  ASCII (don’t → don't, … → ..., en/em dashes → -), accented Latin folds to base
  letters (café → cafe, straße → strasse), and ~40 emoji map to real font glyphs
  (❤ → ♥, 🙂 → ☺, 🎵 → ♫, 👍 → +1, arrows → ← → ↑ ↓).
• Cyrillic and Greek romanisation — Привет → Privet, Ретранслятор → Retranslyator,
  Αθήνα → Athina. Covers the main Cyrillic block, the Ukrainian/Serbian/Macedonian
  extensions, and Greek including final sigma and accented vowels. The table is Russian-style,
  so Ukrainian и romanises as i rather than y.
• Context-dependent handling for emoji with no font glyph: dropped from names (a marker is
  just noise in front of the word), shown as a bullet in message bodies (silently dropping
  what a sender wrote would change the message). Names fall back to blocks only when a name
  would otherwise render empty.

UI pages

• Clock page with 12h / 24h / analogue styles and a persisted UTC offset, plus a battery
  sub-view (percentage, charge bar, millivolts, power source, uptime, CPU die temperature).
• Recent page listing heard nodes, with per-node ping, a zero-hop/flood advert chooser, and a
  confirm-guarded clear.
• Radio page with a live channel-RSSI spectrum anchored to the noise floor, and a traffic
  monitor sub-view tabulating the last frames by type, route, hops, RSSI, SNR and age.
• GPS page with satellite bar, speed, altitude, and a course-over-ground compass sub-view.
• Settings page consolidating Bluetooth, GPS, tones, screen, clock, region, TX power, BLE pin,
  auto-lock and hibernate, with in-place editing and confirm-on-commit for destructive changes.
• Node-to-node ping from the UI, over telemetry request for known chat contacts and trace
  otherwise, reporting round-trip time and SNR.

GPS

• Eco mode — a third GPS state that duty-cycles the receiver (10 min interval, 90 s fix window,
  15 s settle) instead of running it continuously. No preferences are written per cycle.
• Cached last-known fix, so the GPS page shows coordinates and the fix time while the receiver
  is powered down between eco cycles, rather than a countdown.
• Speed and course over ground added to LocationProvider (getSpeedKnotsX1000(),
  getCourseDegX1000()), defaulting to unsupported for providers that cannot supply them.

Messaging

• Conversation threading, a message read view with scrolling, and quick-reply presets.
• Wake on msg setting — whether an incoming message may light the screen. Messages never
  take over the display during active use, and a screen switched off deliberately with Back
  stays off.

Power & display

• Configurable screen timeout, keep-awake-while-USB-powered, and auto-lock on timeout.

E-ink

• Two e-ink variants (B/W and tri-colour) with activity-aware refresh pacing and periodic
  full refreshes to clear ghosting.

Changed

• Settings item Screen off is now Screen, a submenu covering timeout, USB behaviour and
  message wake.
• Altitude in feet, speed in mph, temperature in °F, battery as a percentage.

Fixed

• Contact names in the compose recipient picker were rendered without UTF-8 filtering, sending
  raw bytes to a CP437 font and producing mojibake. Every other name path was already filtered.

Security

These harden upstream code and are not specific to this board.

• Decryption wrote past the destination buffer. Utils::decrypt() always writes whole
  16-byte blocks, but neither it nor MACThenDecrypt() knew how large the destination was.
  Both now take a dest_size and refuse to write when the block-rounded length will not fit.
• Attacker-supplied embedded paths were trusted. A malformed path_len in a received PATH
  packet pushed the read cursor past the decrypted data, underflowing extra_len. The path
  length is now validated and the cursor bounds-checked before use.
• Unused channel slots matched anything. Empty slots are all zeroes, so they matched hash 0
  with a secret any attacker could guess. Slots with an all-zero secret are now skipped.
• BLE queue races. recv_queue is produced on the BLE callback task and consumed on the
  loop task; dequeue-and-shift, frame enqueue and buffer clearing were unsynchronised, so a
  preempting callback could splice two frames together or corrupt the queue length. These are
  now critical sections, reads happen outside them, and enqueue is bounded by the queue size.
• Off-air lengths were used unclamped when building serial frames; they are now clamped to
  what the serial layer accepts.

Build history

Per-build detail, newest first. These were flashed and tested on hardware but predate the
repository's commit history.