Key Takeaways
- A traffic-signal cabinet MMS is door ID and conflict-monitor crop — not a drone still of the whole intersection.
- Signal shop and police traffic are different lists. Do not reuse a water-tower hatch template.
- Free is 1 device, 300 SMS lifetime, and 300 contacts. Developer is 25,000 SMS per year. Platform price is devices plus send volume.
- Crew-app OTP stays off the night radio.
- Idempotency is cabinet-id plus ticket — flash mode recuts the same work order.
Summary
Scenario 1461 is field-service MMS for traffic-signal cabinets — not water-tower hatches, not UST sumps, not bridge joints, not wind nacelles. Flash-mode is a hint. Door-closed crop is the join. 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: night dual-SIM plus a spare. Uncapped platform volume is not unlimited carrier SMS. Confirm payloads in Developer Center.
flash · door crop · MMS
cabinet + ticket — flash recuts once
A cabinet crop is not a skyline dump
Shop copy names the cabinet and conflict-monitor LED. Public delay alerts live elsewhere. Mixing them is how a technician STOPs the week the only cabinet they own is actually back in stop-and-go.
If dispatch fires “complete” when the truck arrives, the shop thinks the conflict monitor is photographed. Join door-closed crop. Suppress arrive-to-buyer templates.
Signal-cabinet MMS matrix
| Event | SMS / MMS | Failure |
|---|---|---|
| Arrive / flash | None or “on site” | “Complete” before door crop |
| Door-closed crop | Cabinet ID + monitor | Public delay stuffed in |
| Retest after flash | Once after new crop | Two complete texts |
| Crew OTP | Auth pool | OTP on the night radio |
Door ID vs whole-intersection dump
Persist cabinet-id plus ticket. DLR. MCP wraps REST only.
Lane closure is not auto-reply
The MMS is that cabinet. A traveler alert is marketing. FTC business guidance is not a reason to hide the crop behind a city-wide delay blast.
Devices, volume, and airtime
Storm nights spike. We meter devices and platform sends. Free (1/300/300) is one cabinet proof.
Night operations
Charge the bucket-truck chassis before flash windows. Setup, Downloads, pricing.
Decision guide
Ship when notice joins door-closed crop. Delay if arrive texts “complete.” Not a CodeCanyon ITS pack.
Cabinet checklist
- Cabinet plus ticket idempotency.
- Arrive silent as complete.
- Public delay off shop purpose.
- OTP off night SIM.
- Developer Center fields confirmed.
Next steps
Scenario 1401 water tower, scenario 1341 garage lift.
Related product pages
Jump to the live product docs for this topic—not another long-form article.
- MMS gateway on your own SIMMultimedia where supported
- two-way SMS inboxReplies on your SIM
- SMS API documentationLive endpoint reference
- device and SMS volume pricingPlans and allowances
