Archived from the old WioL1Pro-CVHBuild repository (first published 2026-08-09). 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-v56 — 2026-08-09

Builds 48–56. Only build 48 was flashed and tested on hardware; 49–56 are staged.

Added

Bluetooth

• The BLE pairing pin can be set on the device. The Settings row was previously hardcoded
  read-only, so the pin could only be changed from the phone app. Six digit cells: Left/Right
  walks them, Up/Down cycles the one under the caret through 0–9. 000000 means auto, where
  the device picks a pin each session.
• Pin changes apply without a reboot, via a new BaseSerialInterface::setPin() implemented
  for nRF52 and ESP32. Devices already bonded keep their keys and stay paired — the pin gates
  new pairings only.
• The app's CMD_SET_DEVICE_PIN and the set pin serial command now route through the same
  MyMesh::setBLEPin(), so all three paths validate, persist and apply identically.

Display

• Brightness setting, 10/25/50/75/100 %, persisted at NodePrefs byte 146. The SH1106 has
  no backlight, so this drives the contrast register (0x81) that sets segment current — a
  real power lever, not just a comfort one. Applied live while stepping; Back restores.
  Percentages are perceived brightness, squared on the way to the register (10 % → 2,
  50 % → 63, 100 % → 255), because eye response to luminance is a power law and a linear map
  leaves every visible step crowded into the bottom fifth of the range.
• New DisplayDriver::hasBrightness() / setBrightness() virtuals, defaulting to no-ops. The
  row reads n/a on e-ink, which is reflective and has nothing to turn up.

Radio page

• Third sub-view: fullscreen spectrum. Up/Down now cycles settings+spectrum → traffic →
  fullscreen. 24 px graph with a dotted peak-hold rule, live channel RSSI and noise floor, and
  the peak/low of the window in dBm.
• Enter sends an advert from any Radio sub-view, using the Recent page's existing zero-hop vs.
  flood chooser. Nothing transmits until the choice is confirmed.

Battery view

• Discharge graph replacing the fill-bar, with a dotted 20 % reference line and an
  estimated time remaining. The bar only restated a percentage already printed twice on the
  same page; the trend is the part a number cannot give you.
• The buffer is self-scaling: 63 slots, 126 bytes, allocated once. Sampling starts at 20 s
  spacing and each time the buffer fills it discards every other sample in place and doubles
  the spacing — 21 min of window at first, ~11 h after five compactions, ~90 h after eight. It
  never grows, wraps or resets.

Changed

• Key lock is two gestures instead of one toggle: hold Back to lock, double-click Back to
  unlock. Double-click no longer locks. UITask::toggleLock() was removed so nothing can
  reintroduce the toggle. Triple-click still unlocks, for a fumbled double.
• Radio page values are laid out on a real column grid — labels on a left rule, values
  right-aligned onto a common rule, split by a vertical divider — so digits stack vertically.
  Units were dropped from the values, which is what makes the numbers align rather than merely
  the fields. Previously the second column was padded inside a single sprintf(), so
  BW 250.00 versus BW 7.80 shifted CR sideways.
• Spectrum samples are captured at the fullscreen graph's resolution and divided down for the
  compact band, instead of being captured at the compact 7 px resolution and blown up.
• setBLEPin() accepts 0–999999 rather than 0 or 100000–999999. A BLE passkey is a
  six-character field, so 012345 is a real pin; both backends already format to six digits.

Fixed

• The GPS was left running through hibernate. nRF52 System OFF retains GPIO levels, so a
  GPS enabled at power-off kept acquiring at tens of milliamps on a device that looked off.
  It is now stopped before powerOff(), without touching prefs, so the chosen mode returns on
  the next boot.
• start_gps() / stop_gps() are idempotent. Re-selecting the mode already active leaked a
  ref-counted claim on the shared peripheral rail that the matching stop could never undo, and
  re-ran _location->reset(), forcing a cold start on boards with a GPS reset pin.
• E-ink layout occupied roughly two thirds of the panel. EINK_SCALE_Y was 1.28 for a
  250×122 panel showing a 128×64 canvas, mapping 64 rows onto 82 pixels and leaving the bottom
  third blank, while crushing the 9 px row pitch to 11.5 physical px against a font needing 18.
  Now 1.90625 (122 ÷ 64).
• E-ink text baselines are derived from each font's ascent (EINK_TEXT_BASELINE_AUTO) instead
  of a hand-tuned EINK_Y_OFFSET that could only line up for one text size. Adafruit_GFX
  places custom fonts on the baseline while every caller passes the top-left corner.
• New EINK_LOGICAL_W/EINK_LOGICAL_H report the canvas the UI was drawn for, so anything
  sizing itself off height() — the alert popup — is no longer given 128 on a 64-row layout.

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. Builds up to and including 48 were flashed and tested on
hardware; 49–56 are staged but unflashed. All predate the repository's commit history.