Key Takeaways
- Rails talks to an Android SMS gateway over HTTPS/JSON (REST) with server-side secrets — not a branded Rails “Complete SDK” product.
- Enqueue ActiveJob (or Sidekiq) workers so user requests do not wait on radio latency; pace workers to handset reality.
- HTTP accept is not delivery — persist message IDs and verify with DLR or webhooks.
- Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Free is 300 SMS lifetime; paid from $19/month.
- Keep OTP jobs on an isolated queue/device pool from promotional blasts.
- Confirm live fields in Developer Center; this guide teaches patterns only.
Summary
This Hub I guide covers android sms gateway api patterns for queue workers using Rails against an Android device gateway. Start from Android SMS Gateway API and confirm live parameters in the SMS API documentation. Integration is REST HTTPS/JSON from your app server — not a fake Complete Rails SDK. Priced by devices and SMS send volume. You use your own phone and operator SMS credit.
If the worker pool can enqueue faster than one SIM can transmit, you built a queue, not a load test pass. Pace ActiveJob to the radio — raise OEM ceilings where allowed, never pretend carrier fair-use disappeared.
Context
Rails teams usually want queue workers without rewriting their domain model. Keep a narrow gateway client interface that posts JSON and returns message IDs. The phone still sends SMS on a SIM you fund. Prefer async workers so controllers do not wait on radio latency. Related: Transactional SMS, how an Android SMS gateway works, Active Job basics.
Design: ActiveJob + REST client
One PORO or service object wraps Faraday/Net::HTTP. Jobs call that client — never embed API keys in the job arguments. Configure Sidekiq/GoodJob concurrency below the sustainable SMS/min of your OTP device pool. Dual queues help: sms_otp high priority, sms_bulk paced.
Worker pattern table
| Pattern | Use when | Watch for |
|---|---|---|
| Inline controller send | Never for production OTP | Timeouts, double-submit, blocked Puma threads |
| ActiveJob + REST | Default for OTP and alerts | Retry storms without idempotency |
| Bulk paced jobs | Consented campaigns | Starving OTP queue; operator fair-use |
| Webhook receiver | DLR correlation | Unsigned callbacks; missing message ID map |
Implementation shape
- Read API key from credentials / ENV — never from the frontend.
- POST send with idempotency key for OTP.
- Persist gateway message ID on the domain record.
- On transport error, re-enqueue with backoff; on permanent reject, fail the job.
- Update status from DLR webhook or poll — accept ≠ delivered.
Confirm field names in the SMS API documentation. Sample HTTP clients elsewhere are REST examples — not an official Rails gem product line.
Failure modes
- Phone offline while jobs succeed in Redis — alert on last-seen.
- Worker concurrency above OEM/carrier ceiling — Pending age climbs.
- Blind retries duplicate OTP — always key idempotently.
- Bulk queue sharing OTP workers — login latency spikes.
Security
Keys in credentials.yml.enc / ENV only. Verify webhook signatures when callbacks are enabled. Avoid logging full OTP bodies to shared log drains. No Complete SDK download page that ships secrets in demos.
Operations
Free is 300 SMS lifetime; paid from $19/month meters devices and platform volume — operator airtime is separate. Monitor queue depth, job latency, device last-seen, and airtime balance together. See device and SMS volume pricing.
Checklist
- REST client only — no fake SDK product claims.
- OTP and bulk on separate queues/devices.
- Idempotency + DLR path tested on staff numbers.
- Concurrency capped to radio reality; OEM ceilings documented.
- Secrets in ENV; last-seen alerts live.
Next steps
Return to the API hub, open device setup, and confirm live fields in the SMS API documentation.
Related product pages
Jump to the live product docs for this topic—not another long-form article.
- SMS API documentationLive endpoint reference
- device and SMS volume pricingPlans and allowances
- Android SMS gateway product guideDefinition, product, and how to buy
- download the Android gateway appGet the APK
