Key Takeaways
- Scenario 916 is 15:20 minibus-breakdown pickup failover — not exam-window, homework, enrollment, snow-day, PTC, results, late-bus 15:40, field-trip, after-school, lunch till, away-fixture, inset 12:40, sports-rain, seating swap, or swim cancel.
- A spare that IT racks at 12:00 and unplugs at 14:30 is not breakdown HA.
- Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Free is 300 SMS lifetime, 1 device. Developer is 25,000 SMS per year.
- Starter is 2 devices; the spare still counts.
- Hold PTA lists until the last pickup notice drains.
- Canary both radios at 15:00, not at the 09:00 health check.
Summary
Scenario 916 is a dead minibus: gate pickup at 15:20, a spare already paired, PTA held until notices drain.Service pricing is based on device count and total SMS sent through the gateway. You need a working Android phone with a SIM and SMS credit from your mobile operator. Operator message costs are yours—we do not sell carrier SMS balance.
If the bus is on the hard shoulder and the spare is in a drawer, you did not fail over. You hoped parents would guess the gate.
Not a CodeCanyon “school SMS” pack. Device meters apply — Twilio vs Android SMS gateway.
Key takeaways
- Scenario 916 is 15:20 minibus-breakdown pickup failover — not exam-window, homework, enrollment, snow-day, PTC, results, late-bus 15:40, field-trip, after-school, lunch till, away-fixture, inset 12:40, sports-rain, seating swap, or swim cancel.
- A spare that IT racks at 12:00 and unplugs at 14:30 is not breakdown HA.
- Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Free is 300 SMS lifetime, 1 device. Developer is 25,000 SMS per year.
- Starter is 2 devices; the spare still counts.
- Hold PTA lists until the last pickup notice drains.
- Canary both radios at 15:00, not at the 09:00 health check.
Related reading
education SMS, multi-device SMS, how an Android SMS gateway works, GOV.UK school attendance.
Context
Transport calls at 14:50. Parents leave work at 15:10. PTA still wants a raffle CSV.
Free (300 SMS lifetime) is a rehearsal route. Developer is 25,000 SMS per year.
Core scenario guidance
15:20 is pickup change + delay. Spare is live before 15:00. Timezone is the campus, not the MAT HQ.
Minibus failover roles
| Role | When | Typical fail |
|---|---|---|
| Breakdown + pickup change | 15:10–16:10 parent local | Phone in a locked office after 15:00 |
| Hot spare | Primary unpaired or submit errors | Unplugged when staff met the bus |
| Parent portal OTP | Transactional, own pool | Dumped onto the bus SIM |
| PTA / merch | Held until last pickup | Released at 15:10 into notices |
Cost and ownership
Priced by devices and SMS send volume. You use your own phone and operator SMS credit. The bus spare is a billed device. Resends burn airtime.
Name a 14:45–16:30 on-call for transport days, not only IT weekdays.
Operations
15:00 canary both radios. Abort: hold PTA, keep OTP, skip a second “all routes” blast. Do not “resend campus.”
Security and compliance
Short bodies. No pupil names plus medical flags in one SMS. Authenticate MIS hooks. PTA lists are promotional.
Decision guide
Ship when 15:00 canary is green and the spare is already paired. Delay if phones lock after 14:30. If handsets are forbidden, CPaaS for portal OTP.
Checklist
- Primary + bus spare paired.
- 15:00 canary.
- Spare live before 15:10.
- OTP isolated.
- PTA held.
- Airtime before 14:45.
- Battery exemptions both OEMs.
- Campus locale.
- Transport on-call named.
- Device cap includes spare.
Next steps
Review device and SMS volume pricing, device setup, SMS API documentation.
Deep dive: production hardening
Caretakers pulling USB at 14:40 is an outage at 15:20. Watch DLR, not MIS 200s.
Deep dive: scaling and failure modes
Multi-route breakdowns add devices before inventing a hidden unlimited-handset SKU. Raise OEM ceilings; fair-use remains.
Deep dive: integration discipline
Idempotency on route_id + local_date + kind (break|pickup). MCP is a REST wrapper — live fields in Developer Center.
Priced by devices and SMS send volume. You use your own phone and operator SMS credit.
15:00 bus drill
Canary both radios. Fail the primary; confirm pickup DLR on the spare. Hold PTA during the wave.
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
- OTP and 2FA SMS on AndroidAuthentication flows
- SMS delivery reports (DLR)Delivery status tracking
- SMS API documentationLive endpoint reference
