Security

Loitering Detection

Detects prolonged stationary presence in monitored zones, triggering alerts when configurable dwell time thresholds are exceeded. Runs on ESP32-S3 with CSI presence input — no cameras, no images, no PII.

Source cognitum-one/cogs/src/cogs/loitering Hardware ESP32-S3 Input CSI presence Size 14 KB Difficulty Easy

Monitored zones

—

active / total

Active presences

—

across all zones

Avg dwell time

—

last 24h

Alerts today

—

vs yesterday

CSI sample rate

—

across fleet

Active occupancy (last 30 min)

Stacked by zone · 1s tick

Current zone occupancy

Ring gauges — % of threshold dwell

Recent loitering alerts

Last 10 detections

Time	Zone	Dwell	Threshold	Device	Status
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Live presence stream

Real-time CSI presence and dwell counters from paired ESP32-S3 sensors. Events are emitted on the cog event bus as loitering_detected when the dwell threshold is crossed.

Dwell time per zone (live)

Seconds since each zone became occupied

Event feed

Newest first · click to acknowledge

CSI signal heatmap (rolling 60s)

Per-device CSI variance — bright = motion, dim = stationary

Zones

Define monitored areas. Each zone maps to one or more CSI sensors and has its own dwell threshold.

Alerts

Every loitering_detected event, with ack/dismiss/resolve actions.

Time	Zone	Dwell	Threshold	Device	Status	Actions

Alert timeline

Detections per hour — last 24h

Thresholds

Tune dwell-time thresholds per zone. Lower = more sensitive (more alerts). Higher = fewer but more confident detections.

Per-zone dwell thresholds

Slide to adjust — applies immediately

Global defaults

Applied to newly created zones

Threshold impact preview

Estimated alerts/day at each global threshold

Devices

ESP32-S3 seeds reporting CSI presence into this cog. Each device feeds one zone.

Analytics

Patterns in loitering events: when, where, and how long. Histories are rolled in-process; persist to RVF index for cross-session retention.

Detection heatmap (last 26 weeks)

Each cell is one day · brighter = more detections

0 — —

Dwell-time distribution

Histogram of all detections — 30s buckets

Detections by zone

Last 14 days

total

Detections per day (14d trend)

All zones combined

Settings

Cog-level configuration for the Loitering detector.

Notifications

How loitering events are surfaced

Event schema

Emitted on the cog event bus

{
  "event": "loitering_detected",
  "fields": {
    "zone_id":   "string",
    "dwell_time":"integer (seconds)"
  },
  "hardware":  "ESP32-S3",
  "input":     "CSI presence",
  "version":   "1.0.0"
}

Data retention

How long events are kept locally

Danger zone

Irreversible operations