Key Takeaways
- Scenario 232 is farm-school 07:25 livestock-duty cancel failover — not greenhouse 07:15, drama 09:05, DT 08:55, or science-lab 08:35.
- A 07:25 that stays on a single SIM when the site radio dies is pupils still walking to the barn, not a tidy MIS log.
- 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 farm spare still counts.
- Hold PTA CSV until barn DLR drains.
- Canary the farm SIM at 07:05, not at last night’s portal job.
Summary
Scenario 232 is a farm-school livestock-duty cancel: 07:25 parent SMS with a live spare if the site radio dies, PTA CSV held until DLR drains. 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 vet isolation hits at 07:18 and the spare is still in a locked tack room, you logged a biosecurity note. You did not stop the walk to the barn.
Not a CodeCanyon “school SMS” pack. Device meters apply — Twilio vs Android SMS gateway.
Key takeaways
- Scenario 232 is farm-school 07:25 livestock-duty cancel failover — not greenhouse 07:15, drama 09:05, DT 08:55, or science-lab 08:35.
- A 07:25 that stays on a single SIM when the site radio dies is pupils still walking to the barn, not a tidy MIS log.
- 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 farm spare still counts.
- Hold PTA CSV until barn DLR drains.
- Canary the farm SIM at 07:05, not at last night’s portal job.
Related reading
multi-device and dual SIM routing, how an Android SMS gateway works, device setup, DfE health and safety advice for schools.
Context
Yard staff flags isolation at 07:18. Period 1 starts at 08:45. PTA still wants a raffle CSV.
Free (300 SMS lifetime) is a rehearsal year-group. Developer is 25,000 SMS per year.
Core scenario guidance
07:25 is farm HA, not greenhouse 07:15 or drama 09:05. Timezone is the school, not the trust HQ.
Farm failover roles
| Role | When | Typical fail |
|---|---|---|
| 07:25 livestock-cancel SMS | School local, before P1 | Primary SIM asleep; spare in a locked tack room |
| Duplicate cancel | Same set_id same morning | Second 07:25 treated as a new blast |
| Staff OTP | Transactional, own pool | Dumped onto the farm radio |
| PTA / raffle | Held until last cancel DLR | Released at 07:10 into barn SMS |
Cost and ownership
Priced by devices and SMS send volume. You use your own phone and operator SMS credit. The farm spare is a billed device. Failover retries burn airtime.
Name a 06:50–09:00 on-call for livestock mornings, not only weekday MIS.
Operations
07:05 canary. Abort: hold PTA, keep staff OTP, skip a second “all parents” blast. Do not “resend the year.”
Security and compliance
Short cancel texts. No pupil names in SMS. Authenticate MIS hooks. PTA lists are promotional.
Decision guide
Ship when 07:05 canary is green and the spare is powered in the office, not the tack room. Delay if both radios share one USB. If handsets are forbidden, CPaaS for staff OTP.
Checklist
- Farm SIM paired before 06:50.
- 07:05 canary.
- Spare live in the office.
- Staff OTP isolated.
- PTA held.
- Airtime before 06:50.
- Battery exemptions.
- School locale.
- Barn on-call named.
- Device cap includes spare.
Next steps
Review device and SMS volume pricing, device setup, SMS API documentation.
Deep dive: production hardening
A locked tack room at 07:18 is an outage at 07:25. Watch DLR, not MIS 200s.
Deep dive: scaling and failure modes
Two-site farm mornings add devices before inventing a hidden unlimited-handset SKU. Raise OEM ceilings; fair-use remains.
Deep dive: integration discipline
Idempotency on set_id + date + kind (cancel|failover). 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.
07:05 farm drill
Canary. Kill the primary. Confirm the spare sends one livestock-cancel SMS. 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
