Android SMS Gateway Scenario 1866: Real-estate scheduled SMS in practice

Summary

Scenario 1866 is fire-door inspection at T-5 08:00 occupier-local: notice out, T-1 chase later, board 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 joiner is already in the stairwell and SMS is still behind “just listed,” you did not notify. You advertised the block.

Not a CodeCanyon “estate agent SMS” pack. Device meters apply — Twilio vs Android SMS gateway.

Key takeaways

• Scenario 1866 is fire-door T-5 08:00 SMS — not listing, lettings, key day, rent T-3, HOA, open-house, auction, solicitor T-0 pack, gas-safety, valuation, inventory, EPC, keys-with-agent, void frost, meter-read, evening viewing, boiler, check-out, right-to-rent, AST T-28, snagging T-2, ground-rent T-7, deposit T-10, PAT T-5, completion-funds T-0, service-charge T-14, asbestos T-21, legionella T-7, EICR T-14, FRA T-21, or lift T-2.
• A T-5 that fires at HQ 14:00 after occupiers already left for work is a clock fail, not a fire-safety nicety.
• 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 compliance spare still counts.
• Hold board CSV until T-5 DLR drains.
• Canary the fire-door SIM at 07:40, not at last night’s portal job.

Related reading

real estate SMS, scheduled SMS, how an Android SMS gateway works, GOV.UK workplace fire safety.

Context

PMS marks T-5 at midnight UTC. Occupiers read SMS at 08:00 local. Sales still wants a board CSV.

Free (300 SMS lifetime) is a rehearsal block. Developer is 25,000 SMS per year.

Core scenario guidance

08:00 is fire-door access, not PAT T-5 09:00. Timezone is the occupier, not HQ.

Fire-door roles

Cost and ownership

Priced by devices and SMS send volume. You use your own phone and operator SMS credit. The compliance spare is a billed device. Duplicate T-5 burns airtime.

Name a 07:20–10:00 on-call for door mornings, not only Saturday viewings.

Operations

07:40 canary. Abort: hold board CSV, keep portal OTP, skip a second “all units” blast. Do not “resend the block.”

Security and compliance

Short bodies. No stairwell codes plus names in one SMS. Authenticate PMS hooks. Board lists are promotional.

Decision guide

Ship when 07:40 canary is green and clocks are occupier-local. Delay if phones lock in the office after 18:00. If handsets are forbidden, CPaaS for portal OTP.

Checklist

• Door SIM paired overnight.
• 07:40 canary.
• Occupier locale, not HQ.
• Portal OTP isolated.
• Board CSV held.
• Airtime before 07:20.
• Battery exemptions.
• Idempotent T-5 keys.
• Door-morning on-call named.
• Device cap includes spare.

Next steps

Review device and SMS volume pricing, device setup, SMS API documentation.

Deep dive: production hardening

Cleaners unplugging USB at 07:10 is an outage at 08:00. Watch DLR, not PMS 200s.

Deep dive: scaling and failure modes

Multi-estate door weeks add devices before inventing a hidden unlimited-handset SKU. Raise OEM ceilings; fair-use remains.

Deep dive: integration discipline

Idempotency on door_id + offset (t5_0800|t1_0800). 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.

T-5 07:40 drill

Canary. Fire one T-5. Confirm DLR before board CSV. Hold listings during the wave.