Reporter task counts consecutive heartbeat failures from the bool
returned by reporter_heartbeat (Task 5). After 6 consecutive misses
(~6 hours at the hourly cadence) the device logs EVT_HEARTBEAT_MISS
then EVT_REBOOT(REBOOT_HEARTBEAT_MISS) and restarts, giving the whole
network stack a clean reinitialization. The 200ms delay before the
restart lets NVS commit the REBOOT entry so the next boot can report
it via EVT_BOOT + esp_reset_reason().
30s TWDT subscribes all three long-running tasks and panics on hang.
The reporter task's retry loop explicitly feeds between attempts so
the 3-try sequence (worst case 52s) does not itself trip the dog.
Reset reason on next boot is visible via esp_reset_reason() which
EVT_BOOT already logs.
Unbounded TLS/HTTP POSTs were blocking the reporter task indefinitely
on weak WiFi. Now: 5s connect timeout, 10s response timeout, 3 attempts
with 0/2s/5s backoff. Every attempt logs HTTP_OK or HTTP_FAIL to the
event log. reporter_heartbeat now returns bool so the caller can count
consecutive misses.
- net_guard_tick now detects status-vs-event divergence. If s_up is
true but WiFi.status() says otherwise (rare: driver wedge, silent
RF failure), force DOWN state and schedule reconnect. Uses 0xFF
disconnect reason so the event log distinguishes this path.
- Forward-declare DeviceConfig in net_guard.h so consumers that don't
call net_guard_start don't transitively pull config.h.
loop() no longer blocks for 5s after a disconnect; reconnect is
scheduled from the WiFi event handler with exponential backoff.
Buffered reports flush on every clean UP transition.
Mutex take in event_log_write and event_log_read_recent switched
from portMAX_DELAY to pdMS_TO_TICKS(50) with skip-on-timeout. Prevents
the high-priority WiFi event task from stalling on NVS writes; diag
loss under contention is preferable to dropped WiFi events.
- Seed s_up from WiFi.status() in net_guard_start so the first
STA_GOT_IP (fired during setup's busy-wait, before onEvent was
registered) is not missed — prevents a reconnect flap on every boot.
- Drop WiFi.disconnect() from net_guard_tick; WiFi.begin() alone
re-associates cleanly and avoids a spurious STA_DISCONNECTED that
was double-logging EVT_WIFI_DOWN on every retry.
- Re-check s_up after the millis() timing gate to close the
GOT_IP-vs-tick race.
- Document the volatile-only shared-state contract.
net_guard registers WiFi.onEvent() so disconnects are handled
immediately instead of polled every 1s. Backoff 1s->2s->4s->...->60s cap.
Every up/down transition is logged to the event log with the disconnect
reason code, so field failures are diagnosable.
Every boot logs EVT_BOOT with esp_reset_reason(); every deliberate
ESP.restart() is preceded by EVT_REBOOT with a reason code. This
gives us a persistent answer to 'why did the device just reboot?'.
Exercises the slot-scan logic in event_log_init(): after a simulated
reboot (RAM state cleared, NVS slots preserved) the module must
resume with the correct head/cnt so newest-first read order is
unchanged and subsequent writes continue the seq monotonically.
Adds native-only event_log_test_simulate_reboot() helper. Lifts the
slot-scan loop out of the #ifdef ARDUINO guard so the native stub
exercises the same recovery path as production; the platform-specific
NVS setup remains guarded.
- Remove monotonic counter writes to NVS (stop burning flash on every
event). Derive head and cnt by scanning slots on boot.
- Widen seq to uint32 so slot scan works across multi-year lifetimes.
- Add FreeRTOS mutex around write/read so WiFi event handlers can
safely call event_log_write from another task.
- Check Preferences.begin() return; disable logging if NVS unavailable.
- Extract NTP_SYNC_THRESHOLD constant; drop misleading native uptime.
- Add tests for empty read, max_entries truncation, real-path hash.
Persistent 32-slot ring buffer of tagged diagnostic events (boot, wifi
up/down, http ok/fail, heartbeat miss, reboot). Used to diagnose field
failures post-hoc via the heartbeat payload, without needing serial
access. Native-native stub lets policy be unit-tested.
Replace per-track line-crossing counter with a single event state machine
gated by foreground pixel count (ENTER=250, EXIT=150) and finalized by
quiet-exit or timeout. Direction inferred from centroid excursion
(up_score vs down_score) on quiet-exit fires, and from net displacement
(last_c vs first_c) on timeout fires.
Tuning reflects bench data at the intended 7' overhead mount: walkers
produce smaller centroid excursions than originally modelled, so
EXTENT gates, MIN_TRAJ, MAX_FRAMES and REFRACTORY were all relaxed from
their initial guesses. Constants and rationale live in firmware/lib/cv/cv.h.
Bench results (8 isolated walks, 4 entries + 4 exits):
* Event detection: 8/8 (100%)
* Aggregate entries+exits split: 4+4 (matches)
* Per-walk direction labelling: 4/8 (~50%)
Document explicitly that per-walk direction is unreliable at this mount
and that downstream analytics should trust only gross traffic
(entries + exits). Recovering direction would require a physical mount
change or a richer signal; both are out of scope for v1.
Tooling:
* tools/replay_logs.py — replay event state machine against captured
[F] diagnostic lines, for offline tuning without flash-test loops.
* firmware/src/main_capture.cpp + tools/capture_frames.py +
tools/replay_frames.py — raw-frame capture firmware and Python port
of the detector, kept in tree for future iteration even though the
TimerCamera-F serial driver stripped specific byte ranges in testing
and log-based replay became the working path.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
A single person walking under the overhead camera was generating both an
entry and an exit within a few seconds — the line-crossing logic treated
a blob's traversal into one side of the frame and out the other as two
separate events whenever the track spawned near the line, oscillated
against shadows, or churned at creation.
Replaced line-crossing semantics with directional traversal:
- Each track records spawn_y at creation and a counted flag.
- An event fires only if the track is not yet counted, spawned firm on
one side of the line (|spawn_y - line_y| > CV_TRAVERSAL_MARGIN_PX),
and is now firm on the opposite side. Direction of travel determines
entry vs exit. The track is then flagged counted — one trip, one count.
- Cooldown remains as a secondary safety net.
main.cpp: single/double LED pulse on entry/exit detections. Saves and
restores the current LED state so upload (yellow-on) and no-WiFi
indicators aren't clobbered.
Tests updated to walk blobs beyond the margin and register two new
cases: wobble-at-line doesn't count, and a reversed full traversal
doesn't double-count on the same track.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
When a blob briefly drops below CV_MIN_BLOB_PX, its track is killed and respawns,
causing the same person to generate multiple counts per visit (~50/min observed
in field). Add a per-direction cooldown (default 5 frames ≈ 0.8s @ 5 fps) that
drops subsequent entries (or exits) within the window of the last counted one.
Entry and exit cooldowns are tracked independently.
Fixed at compile time for now; exposing as a server-push tunable is deferred
until the server-push-config branch lands. See docs/server-prompt-crossing-
cooldown.md for the server-side coordination notes.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
- Reduce debug level to 1 (errors only) for production builds
- Replace BLE pause/resume with full deinit/reinit during HTTP uploads (~25KB freed)
- Add 60s boot report delay for fast post-deploy connectivity verification
- Add device_id to BLE batch and heartbeat request bodies
- Correct API host to http:// (plain HTTP, not HTTPS)
- Add HTTP response logging and CV entry/exit serial logging
- Create root README.md with operator setup and architecture overview
- Update design spec: HMAC format, BLE memory approach, request body shapes, reporting intervals
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
loopTask: cv_init() created a CVState{} temporary (9KB background
array) on the stack — fixed by initializing members directly.
cam task: cv_process() had uint8_t fg[CV_PIXELS] (9KB) as a local
variable — made static, matching the existing fg_copy fix.
cam task stack bumped from 4096 to 8192 for headroom.
Also: switch to 4MB OTA partition table (TimerCamera-F has 4MB flash,
not 8MB), add CONFIG_ARDUINO_LOOP_STACK_SIZE=16384 build flag,
upload_speed=115200 and --no-stub for reliable CH340 flashing.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- hmac_sign now takes method+path instead of device_id; builds message as
method\npath\ntimestamp\nhex(sha256(body)) per server verify_device_hmac
- reporter: header renamed X-HMAC-Signature → X-Signature; passes "POST"+path
- test vector regenerated against new message format; timestamp-diff test updated
- .size() → .length() throughout (Arduino String has no size())
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Add camera.h/camera.cpp for TimerCamera-F OV3660 init and box-filter
downscale to 96x96 grayscale. Add espressif/esp32-camera to lib_deps.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Replaces empty stub with full application: camera+CV task on core 1 at
5 fps, hourly reporter task on core 0, WiFi reconnect loop, 5-second
factory reset via BOOT button (GPIO37), LED on GPIO2 for status.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- reporter_submit_camera/ble: cap batch to REPORTER_MAX_BUFFER before
POST and assign whole capped batch back to buffer on failure, fixing
silent record drop when batch > buffer capacity
- post_json: reject sends when ts < 1700000000 (clock not NTP-synced)
- post_json: add comment documenting intentional no-cert-validation
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Add passive BLE scan module using NimBLE for WiFi coexistence. Tracks
unique devices per hour with SHA256-hashed MACs, RSSI bucketing
(near/mid/far), max concurrent count, and thread-safe collect/reset.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Add BFS flood-fill blob extraction, centroid finding, and nearest-neighbour track matching/spawning inside cv_process. Add test verifying a new blob spawns a track.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Replace short-circuit boolean evaluation of putString return values with
separate size_t variables so both writes always execute regardless of
whether the first succeeds.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- Switch board to m5stack-timer-cam (confirmed in pio boards)
- Pin platform to espressif32@6.6.0
- Replace huge_app.csv with custom partitions_8mb_ota.csv (8MB + OTA)
- Add -DCONFIG_BT_NIMBLE_ENABLED=1 and -DCONFIG_SPIRAM_USE_MALLOC=1
- Add h2zero/NimBLE-Arduino@^1.4.2 to lib_deps
- Raise CORE_DEBUG_LEVEL from 1 → 3
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
