Previously every successful config save triggered ESP.restart() — meant rapid
config changes caused reboot cascades and made the test suite unable to run
multiple cases against /config. Now restarts only if ssid/password/hostname/
ntp_server changed; other settings (brightness, timezone, intervals, coords,
display options) apply live without reboot.
tests/test_device.py: fixed expected field names for /api/time
(time/hours/minutes/epoch instead of current/timezone_offset/ntp_synced).
Test suite: 73/73 passing on hardware. Heap drift <1KB across full fuzz run.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Previously /config accepted any value and called ESP.restart() — fuzz tests
(or any malicious POST) could save garbage SSIDs and brick the device until
FTDI recovery. Now:
- SSID: rejected if empty, >31 chars, non-printable, or all-same-char (HTTP 400)
- Password: rejected if >63 chars
- Hostname/city_name/ntp_server: length-validated
- Numeric fields (timezone, brightness, intervals, lat/lon, display): clamped
to safe ranges via constrain()
Tested on hardware: ssid="AAAA..." now correctly returns HTTP 400 and
preserves existing config. Device survives entire fuzz suite.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
C1 (critical): Add 15s watchdog for WEATHER_REQUESTING state — resets to
IDLE if TCP connection hangs silently, preventing permanent weather death
C2 (critical): Fix millis() rollover in all retry timers — replace unsafe
`millis() >= nextRetryTime` with subtraction-safe `(millis() - nextRetryTime)
< 0x80000000UL` in RetryConfig and WiFiRetryConfig; fix boot guard with
static flag instead of raw millis() comparison
H1 (high): Fix DST last-Sunday formula — was using incorrect year-only
heuristic; now derives weekday of the 31st from current day's tm_wday:
`weekdayOf31 = (tm_wday + (31 - day)) % 7`. Verified: March 2026 = 29th ✓
H2 (high): Replace String+= with snprintf+sendContent in handleAPITime,
handleAPIStatus, handleAPIDebug, handleAPIWeather — eliminates permanent
heap fragmentation from JS polling every second
H3 (high): Add volatile to weatherState and ntpState — shared between
ESPAsyncTCP callbacks and main loop; prevents stale register-cached reads
RAM: 37,268 bytes (46%) — reduced from 37,560 due to String elimination
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
clock_ntp_ota_v1.9/ → weather_clock/ (version no longer baked into path)
clock_ntp_ota_v1.9.ino → weather_clock.ino
Version is tracked in config.h (FIRMWARE_VERSION), not in filenames.
Updated references in README, CONTRIBUTING, and docs/INSTALLATION.md.
Note: forks using the old path will need to sync this rename before
submitting new PRs.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
