Android SMS Gateway Scenario 366: Real-estate scheduled SMS in practice

Summary

Scenario 366 is the auction-morning clock: bidder OTP through registration, then one lot-order drop at 09:15 to people still registered. 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 lot 18 left the catalogue at 09:05 and still appears at 09:15, you did not schedule the sale. You sent people to a hammer that will not fall.

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

Key takeaways

• Scenario 366 is auction-morning lot-order SMS at 09:15 — not weekday listings, lettings, key day, rent ledger, HOA levy, or Saturday open house.
• Bidder-portal OTP stays off the lot-order SIM.
• 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 saleroom spare still counts.
• A withdrawn lot at 09:05 must kill that row in the 09:15 file.
• Catalogue flyers wait until the first lot is on the block.

Related reading

real estate SMS, scheduled SMS, how an Android SMS gateway works, RICS profession standards.

Context

Paddle numbers confirm overnight. The clerk withdraws lots at 09:00. The 09:15 file must be that freeze, not last night’s PDF. One radio in a locked saleroom office loses the first hour.

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

Core scenario guidance

Freeze at 09:05. The 09:15 job reads that snapshot. Withdrawn lots die in the file, not in a footnote.

Hold catalogue flyers until the first lot is on the block. Timezone is the saleroom city.

Auction-morning roles

Cost and ownership

Priced by devices and SMS send volume. You use your own phone and operator SMS credit. A saleroom spare is a billed device. Resends burn airtime.

Name a 07:30–13:00 on-call for sale mornings, not only weekday listings.

Operations

08:40 canary both radios. After OEM updates, re-pair the night before a big catalogue.

Abort: hold flyer, keep OTP, skip lot-order if the freeze is stale. Do not “resend all paddles.”

Security and compliance

Short bodies. No reserve prices in SMS. Authenticate catalogue withdraw hooks.

Catalogue flyers are promotional. Lot-order to registered bidders is still marketing-adjacent — honour STOP.

Decision guide

Ship when 08:40 canary is green and 09:05 freeze is owned. Delay if phones lock in a closet overnight. If handsets are forbidden, CPaaS for bidder OTP.

Checklist

• Primary + saleroom spare paired.
• 08:40 canary.
• 09:05 freeze owned.
• Withdrawn lots drop from file.
• OTP isolated.
• Flyer held.
• Airtime before 08:00.
• Battery exemptions both OEMs.
• Saleroom-city locale.
• Device cap includes spare.

Next steps

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

Deep dive: production hardening

Cleaners pulling USB at 07:00 is an outage. One brick per radio, labelled.

Dual-SIM remap after patches. Lot-order stays on the documented slot.

No auto-reply on OTP numbers. Watch DLR, not catalogue 200s.

Deep dive: scaling and failure modes

Two-room sales add devices before inventing a hidden unlimited-handset SKU.

Two cities, two 09:15s. One UTC cron leaks the wrong lots.

Raise OEM ceilings; fair-use remains. Not unlimited carrier SMS.

Deep dive: integration discipline

Idempotency on sale_id + sale_date + kind (lot-order|otp).

If an agent files auction SMS, 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.

08:40 lot-order drill

Canary both radios. Withdraw a dummy lot at 09:05; confirm it is absent at 09:15.

Hold a dummy flyer; confirm it does not transmit at 09:00.

Abort: skip lot-order, keep OTP, page if both dark.