Key Takeaways
- Scenario 352 is textiles 11:40 dye-vat cancel failover — not woodshop 10:20, farm 07:25, greenhouse 07:15, or DT 08:55.
- An 11:40 that stays on a single SIM when the vat radio dies is pupils still walking to the dye room, 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 textiles spare still counts.
- Hold PTA CSV until vat DLR drains.
- Canary the textiles SIM at 11:20, not at last night’s portal job.
Summary
Scenario 352 is a textiles dye-vat cancel: 11:40 parent SMS with a live spare if the vat 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 the vat fails at 11:28 and the spare is still in a locked dye store, you logged a COSHH note. You did not stop the walk to the room.
Not a CodeCanyon “school SMS” pack. Device meters apply — Twilio vs Android SMS gateway.
Key takeaways
- Scenario 352 is textiles 11:40 dye-vat cancel failover — not woodshop 10:20, farm 07:25, greenhouse 07:15, or DT 08:55.
- An 11:40 that stays on a single SIM when the vat radio dies is pupils still walking to the dye room, 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 textiles spare still counts.
- Hold PTA CSV until vat DLR drains.
- Canary the textiles SIM at 11:20, not at last night’s portal job.
Related reading
multi-device and dual SIM routing, how an Android SMS gateway works, device setup, HSE textiles.
Context
Tech flags vat fail at 11:28. Period 4 starts at 12:10. 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
11:40 is textiles HA, not woodshop 10:20 or farm 07:25. Timezone is the school, not the trust HQ.
Textiles failover roles
| Role | When | Typical fail |
|---|---|---|
| 11:40 dye-vat-cancel SMS | School local, before P4 | Primary SIM asleep; spare in a locked dye store |
| Duplicate cancel | Same set_id same morning | Second 11:40 treated as a new blast |
| Staff OTP | Transactional, own pool | Dumped onto the vat radio |
| PTA / raffle | Held until last cancel DLR | Released at 11:05 into textiles SMS |
Cost and ownership
Priced by devices and SMS send volume. You use your own phone and operator SMS credit. The textiles spare is a billed device. Failover retries burn airtime.
Name a 10:50–13:00 on-call for vat mornings, not only weekday MIS.
Operations
11:20 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 11:20 canary is green and the spare is powered in the office, not the dye store. Delay if both radios share one USB. If handsets are forbidden, CPaaS for staff OTP.
Checklist
- Textiles SIM paired before 10:50.
- 11:20 canary.
- Spare live in the office.
- Staff OTP isolated.
- PTA held.
- Airtime before 10:50.
- Battery exemptions.
- School locale.
- Vat 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 dye store at 11:28 is an outage at 11:40. Watch DLR, not MIS 200s.
Deep dive: scaling and failure modes
Two-site vat 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.
11:20 textiles drill
Canary. Kill the primary. Confirm the spare sends one dye-vat-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
