Shipping a connected product is easy in the lab and hard in the field. Here's how we design IoT systems that stay online, secure, and maintainable at scale.
From prototype to production
A blinking LED on a dev board is a demo. A fleet of devices reporting telemetry from customer sites, surviving power cuts, flaky Wi-Fi, and firmware updates — that's a product.
1. Design for connectivity loss first
Assume the network will drop. Buffer telemetry locally, use exponential backoff on reconnects, and make every cloud call idempotent so retries never corrupt state.
- Store-and-forward queues on device
- Idempotent ingest endpoints
- Graceful degradation when offline
2. Make firmware updates boring
Over-the-air (OTA) updates should be a non-event. We use dual-bank (A/B) partitions with automatic rollback, so a bad image never bricks a unit in the field.
3. Security is not a feature you add later
Provision unique per-device credentials at manufacturing, encrypt data in transit (TLS), and sign firmware images. Retrofitting security after launch is painful and expensive.
The goal is a system your team can operate confidently six months after launch — not just one that works on demo day.
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