adsb-overhead

Detect aircraft overhead (within a radius) from a local readsb SBS/BaseStation TCP feed and notify via Clawdbot messaging.

This skill is designed for a periodic checker (cron) rather than a long-running daemon.

Quick start (manual test)

1. Run the checker for a few seconds to see if it detects aircraft near you:

python3 skills/public/adsb-overhead/scripts/sbs_overhead_check.py \
  --host <SBS_HOST> --port 30003 \
  --home-lat <LAT> --home-lon <LON> \
  --radius-km 2 \
  --listen-seconds 5 \
  --cooldown-min 15

• If it prints lines, those are new alerts (not in cooldown).
• If it prints nothing, there were no new overhead aircraft during the sample window.

How it works

• Connect to the SBS feed (TCP) for --listen-seconds.
• Track latest lat/lon per ICAO hex.
• Compute distance to --home-lat/--home-lon (Haversine).
• Emit alerts for aircraft within --radius-km only if not alerted within --cooldown-min.
• Persist state to a JSON file (default: ~/.clawdbot/adsb-overhead/state.json).

SBS parsing assumptions are documented in: references/sbs-fields.md.

Create a Clawdbot watcher (cron)

Use a Clawdbot cron job to run periodically. The cron job should:

1. exec the script
2. If stdout is non-empty, message.send it via WhatsApp

Pseudocode for the agent:

• Run:
  • python3 .../sbs_overhead_check.py ...
• If stdout trimmed is not empty:
  • send a WhatsApp message with that text

Suggested polling intervals:

• 30–60 seconds is usually enough (given cooldowns)
• Use --listen-seconds 3..8 so each run can gather a few position frames

Tuning knobs

• Increase --radius-km if you want fewer misses.
• Increase --listen-seconds if your feed is busy but you’re missing position updates.
• Use --cooldown-min to prevent spam (15–60 minutes recommended).