Build an Open Network Logistics Accessibility and Drop-Off Coordinator

Coordinate mock last-mile courier assignments across decentralized delivery networks using Beckn protocol schemas. Match specialized recipient accessibility requirements with courier physical mobility parameters.

Delivery hub operations coordinator managing accessible parcel dispatch for elderly and mobility-impaired recipients.

Parse incoming Beckn fulfillment requests containing recipient accessibility constraints and landmark directions.

Cross-reference courier equipment capabilities and delivery vehicle access constraints against recipient physical barriers.

Synthesize a validated Beckn on_confirm fulfillment packet containing step-by-step accessible drop-off instructions.

Simulate asynchronous callback telemetry and generate exception manifests when courier parameters do not meet accessibility needs.

Dispatcher workspace showing pending fulfillment orders, courier constraint filters, and generated Beckn protocol callback logs.

Generate 30 synthetic Beckn fulfillment payloads containing varying accessibility profiles (staircase-only, elevator outage, landmark drop-off) stored in local JSON format. Starter examples below are synthetic. They are not downloaded records.

Beckn protocol specifications Uses Beckn protocol core transaction packet structure with context and message separation and asynchronous server-to-server callback conventions.

langgraph, fastapi, pydantic. LangGraph manages stateful multi-step routing logic between incoming Beckn order intents, constraint matching, and callback generation. Local or hosted LLM with multi-step reasoning capabilities and JSON mode output.

Submit runnable source, pinned dependencies, setup commands, a working interface, example outputs, and a recorded end-to-end demo. Include tests and an action log.

Validates incoming Beckn context headers including domain, action, and transaction_id.

Correctly matches courier vehicle and physical capacity against building barrier profiles.

Outputs compliant Beckn on_confirm message payloads with complete fulfillment metadata.

Generates a structured exception notice when accessibility criteria cannot be fulfilled.

```json [ { "input": { "context": { "domain": "nic2004:55204", "action": "confirm", "transaction_id": "tx_logistics_101", "bap_id": "mock_buyer_app.org", "bpp_id": "mock_logistics_pp.org" }, "message": { "order": { "id": "ord_9901", "fulfillment": { "end": { "location": { "address": "Flat 302, Green Heights, Pune", "accessibility_flags": [ "elevator_available", "wheelchair_ramp" ] } } } }, "courier_profile": { "courier_id": "c_44", "transport_mode": "two_wheeler", "max_carry_weight_kg": 15 } } }, "expected_output": { "context": { "domain": "nic2004:55204", "action": "on_confirm", "transaction_id": "tx_logistics_101" }, "message": { "order": { "id": "ord_9901", "status": "ACCEPTED", "fulfillment": { "state": "ASSIGNED", "assigned_courier_id": "c_44", "dropoff_instructions": "Use ground ramp and take elevator directly to floor 3." } } }, "accessibility_matched": true } }, { "input": { "context": { "domain": "nic2004:55204", "action": "confirm", "transaction_id": "tx_logistics_102", "bap_id": "mock_buyer_app.org", "bpp_id": "mock_logistics_pp.org" }, "message": { "order": { "id": "ord_9902", "fulfillment": { "end": { "location": { "address": "Floor 4, Old Chawl, Girgaon, Mumbai", "accessibility_flags": [ "staircase_only", "narrow_corridor", "weight_heavy_25kg" ] } } } }, "courier_profile": { "courier_id": "c_12", "transport_mode": "bicycle", "max_carry_weight_kg": 10 } } }, "expected_output": { "context": { "domain": "nic2004:55204", "action": "on_confirm", "transaction_id": "tx_logistics_102" }, "message": { "order": { "id": "ord_9902", "status": "REJECTED", "fulfillment": { "state": "UNASSIGNED", "assigned_courier_id": null, "dropoff_instructions": null } } }, "accessibility_matched": false, "rejection_reason": "courier_weight_and_staircase_limit_exceeded" } } ] ```

All carrier allocations and status callbacks are executed in a simulated sandbox environment without actual financial or delivery liabilities. Use mock external writes. Require human review before any real deployment.