Key Takeaways
- A “tow arrived” SMS dies at the river terminal. The last-mile truck owns the warehouse ETA — different SIM, different template.
- Slot A: wharf / warehouse PINs. Slot B: lock overflow when the truck is offline — never barge promo.
- Free is 1 device, 300 SMS lifetime, and 300 contacts. Developer is 25,000 SMS per year. Platform price is devices plus send volume.
- Broker OTP stays on the warehouse chassis, not the wharf radio that already texted “on the river.”
- Idempotency is barge-id plus lot plus leg (wharf / truck) — not the consignee phone.
Summary
Scenario 531 is dual-SIM routing for inland-barge wharf-to-last-mile-truck handoff — not ocean ports, not rail well cars, not air cargo, not van-to-bike. The tow dies at the river terminal. A truck finishes the warehouse. Those legs must not share a default SIM or a single “your cargo arrived” lie. Service pricing is devices plus SMS send volume. You bring the phones and operator credit. Free is 1 device, 300 SMS lifetime, and 300 contacts.
Starter allows 2 devices: truck dual-SIM plus a spare wharf chassis. Uncapped platform volume is not unlimited carrier SMS. Confirm routing in Developer Center.
lock · wharf · truck PIN
barge-id + lot, one public ETA at a time
River lock dwell is not the truck ETA
Wharf SMS ends at discharge scan. Truck SMS starts after the dray assign. Do not let the “tow in” template keep firing while the lot sits on the apron. Slot A on the warehouse phone owns PINs. Slot B is backup when the truck’s home operator dies under the crane.
If the lock-exit event and the truck assign both fire “it’s here,” the warehouse opens the dock for a chassis still on the wharf. Suppress wharf consignee templates the moment discharge posts.
Barge dual-SIM matrix
| Leg | Radio | Failure |
|---|---|---|
| Tow / lock | Wharf device, no PIN | Warehouse code sent from the river |
| Discharge | Suppress wharf ETA | Two “here” texts |
| Truck assign | Slot A PIN / ETA | Promo SIM used at the gate |
| Apron no-reg | Slot B backup | OTP on the wharf radio |
Wharf-to-truck handoff
Persist barge-id plus lot plus leg. Signed webhooks. Webhooks, DLR. MCP wraps REST only.
Wharf PIN and draft
Hash, short TTL, warehouse slot A only. After OEM updates, canary both slots. Inland ENC.
Devices, volume, and airtime
Two legs can double volume if you forget suppress. We meter devices and platform sends. Free (1/300/300) is one terminal proof.
Terminal operations
Charge both chassis, pairing, slot balances. Setup, Downloads, pricing.
Decision guide
Ship when wharf ETAs die at discharge. Delay if one SIM does both legs and promo. Not a CodeCanyon barge pack.
Barge checklist
- Leg-keyed idempotency.
- Wharf suppress on discharge.
- PIN on warehouse slot A.
- Apron canary on slot B.
- Developer Center fields confirmed.
Next steps
Scenario 471 rail, scenario 411 air cargo.
Related product pages
Jump to the live product docs for this topic—not another long-form article.
- multi-device and dual SIM routingCapacity and failover
- transactional SMS for orders and alertsEvent-driven messages
- SMS delivery reports (DLR)Delivery status tracking
- SMS API documentationLive endpoint reference
