Power-cycle the device 3 times within 10 seconds to trigger factory reset:
- Clears WiFi credentials (SSID + password) in EEPROM
- Shows "FACTORY RESET / WiFi: TJ56654-Setup / Pass: 12345678" on display
- Reboots into WiFiManager AP mode for reconfiguration
Counter stored at EEPROM offset 480 (well past Config ~260 bytes).
Clears automatically after 10s of stable operation.
Prevents the need for FTDI/USB recovery when credentials are corrupted.
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>
