Kmb Bus Arrival

Implementation Notes for Jeffery

API Endpoints (Base URL: https://data.etabus.gov.hk)

• Route List: /v1/transport/kmb/route/
• Route Directions: /v1/transport/kmb/route/{route} (returns route details including bound/direction)
• Route‑Stop: /v1/transport/kmb/route-stop/{route}/{direction}/{service_type} (service_type=1 normally)
• Stop List: /v1/transport/kmb/stop (all stops) or /v1/transport/kmb/stop?name={name} to filter
• Route ETA: /v1/transport/kmb/route-eta/{route}/{service_type}
• Stop ETA: /v1/transport/kmb/stop-eta/{stop}/{service_type}

Script: kmb_bus.py

Place this Python script in the same directory as this SKILL.md. It will be invoked with subcommands as defined above.

Behavior

• getRouteDirection {route}

  • Fetch /v1/transport/kmb/route/{route} (or route list) to determine available directions.
  • Return JSON: { "route": "...", "directions": [{ "bound": "O", "name_tc": "往荃灣", "name_en": "Outbound" }, ...] }

• getRouteInfo {route} {direction}

  • Fetch /v1/transport/kmb/route-stop/{route}/{direction}/1.
  • For each entry in data, extract seq, stop, name_tc, name_en.
  • Return JSON list of stops in order.

• getBusStopID {name}

  • Fetch /v1/transport/kmb/stop?name={name} (simple substring match; the API supports name filtering? Actually the endpoint is /v1/transport/kmb/stop which returns all stops; client can filter locally. Better: fetch full stop list once and cache, then filter by name_tc or name_en containing the query. For simplicity, fetch /v1/transport/kmb/stop and filter locally by name.
  • Return JSON: [ { "stop": "ST871", "name_en": "YU CHUI COURT BUS TERMINUS", "name_tc": "愉翠苑巴士總站" }, ... ]

• getNextArrivals {route} {direction} {stopId}

  • Step 1: Fetch route‑stop for the route/direction to find the seq corresponding to stopId.
  • Step 2: Fetch route‑eta: /v1/transport/kmb/route-eta/{route}/1. The response is a list of ETA objects (or an object with data array). Each has dir, seq, eta, eta_seq, dest_tc, rmk_tc, etc.
  • Step 3: Filter items where dir==direction and seq==stop_seq.
  • Step 4: Sort by eta_seq (bus order) and take the first 3.
  • Step 5: Format each ETA as HH:MM HKT using datetime.fromisoformat.
  • Return JSON: { "stopId": "...", "stopName": "...", "direction": "...", "arrivals": [ "17:35 HKT", "17:47 HKT", "18:00 HKT" ] }
  • If no arrivals, return "No active ETAs" with explanation.

Error Handling

• If any API returns non-200 or empty data, return a clear error message in JSON under error.
• Network timeouts should be caught and reported.

Caching

• Cache the full stop list for ~1 hour to avoid repeated downloads for name searches.
• Cache route‑stop mappings for the same route/direction for 5 minutes.

Testing

Test the script manually before enabling:

• python3 kmb_bus.py getRouteDirection 182
• python3 kmb_bus.py getRouteInfo 182 outbound (should include seq for ST871 if it’s on that route)
• python3 kmb_bus.py getBusStopID "愉翠苑巴士總站"
• python3 kmb_bus.py getNextArrivals 182 outbound ST871

Integration

Ensure the command fields in the tool definitions point to python3 kmb_bus.py <subcommand> ... with proper placeholders. The skill directory must contain this kmb_bus.py file.

Notes

• The KMB Data Hub may return no ETAs outside operating hours (approx 06:00–23:00). Handle gracefully.
• Some stops have multiple IDs; prefer the one that appears in the route‑stop list.