Key Takeaways
- Scenario 292 is woodshop 10:20 dust-extract cancel failover — not farm 07:25, greenhouse 07:15, drama 09:05, or DT 08:55.
- A 10:20 that stays on a single SIM when the extract radio dies is pupils still walking to the shop, 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 shop spare still counts.
- Hold PTA CSV until shop DLR drains.
- Canary the shop SIM at 10:00, not at last night’s portal job.
Summary
Scenario 292 is a woodshop dust-extract cancel: 10:20 parent SMS with a live spare if the shop 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 extract fails at 10:12 and the spare is still in a locked dust cupboard, you logged a COSHH note. You did not stop the walk to the shop.
Not a CodeCanyon “school SMS” pack. Device meters apply — Twilio vs Android SMS gateway.
Key takeaways
- Scenario 292 is woodshop 10:20 dust-extract cancel failover — not farm 07:25, greenhouse 07:15, drama 09:05, or DT 08:55.
- A 10:20 that stays on a single SIM when the extract radio dies is pupils still walking to the shop, 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 shop spare still counts.
- Hold PTA CSV until shop DLR drains.
- Canary the shop SIM at 10:00, not at last night’s portal job.
Related reading
multi-device and dual SIM routing, how an Android SMS gateway works, device setup, HSE woodworking dust.
Context
Tech flags extract fail at 10:12. Period 3 starts at 11:05. 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
10:20 is woodshop HA, not farm 07:25 or DT 08:55. Timezone is the school, not the trust HQ.
Woodshop failover roles
| Role | When | Typical fail |
|---|---|---|
| 10:20 extract-cancel SMS | School local, before P3 | Primary SIM asleep; spare in a locked dust cupboard |
| Duplicate cancel | Same set_id same morning | Second 10:20 treated as a new blast |
| Staff OTP | Transactional, own pool | Dumped onto the shop radio |
| PTA / raffle | Held until last cancel DLR | Released at 09:50 into shop SMS |
Cost and ownership
Priced by devices and SMS send volume. You use your own phone and operator SMS credit. The shop spare is a billed device. Failover retries burn airtime.
Name a 09:30–12:00 on-call for extract mornings, not only weekday MIS.
Operations
10:00 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 10:00 canary is green and the spare is powered in the office, not the dust cupboard. Delay if both radios share one USB. If handsets are forbidden, CPaaS for staff OTP.
Checklist
- Shop SIM paired before 09:30.
- 10:00 canary.
- Spare live in the office.
- Staff OTP isolated.
- PTA held.
- Airtime before 09:30.
- Battery exemptions.
- School locale.
- Shop 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 dust cupboard at 10:12 is an outage at 10:20. Watch DLR, not MIS 200s.
Deep dive: scaling and failure modes
Two-site extract 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.
10:00 woodshop drill
Canary. Kill the primary. Confirm the spare sends one extract-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
