At first high level glance, the RS26x is “just another LoRaWAN temperature sensor”—but the journey to develop it reveals just how complex "simple" IoT devices can be. In this talk, we take a candid look behind the scenes of Ezurio’s sensor evolution, from the successful RS1xx series to the RS26x: our latest dual-protocol (LoRaWAN + Bluetooth) environmental sensor.

We’ll walk through hard-won lessons around software environment, antenna design, battery optimization, temperature response, ingress protection, and RF approvals. Along the way, we’ll cover how we integrated our own RM126x and Lyra24 modules, the architectural decisions that enabled configurability without compromising reliability, and how field failures and customer feedback shaped our redesign.

This is not a product pitch—it’s a blueprint for teams aiming to build, use or specify rugged, certifiable, and truly low-maintenance IoT devices that last. If you’ve ever thought “how hard can it be?”—this talk is for you.