Hardware/SoftwareUnited States2023

Cellular IoT reference device and backend fleet

A low-power cellular sensor node and the routing backend that syncs its fleet to the cloud.

Client: Blues Wireless
Region: United States
Sector: Cellular IoT device + fleet
Engagement: 2023 · 17 weeks
Team: 2 firmware · 2 backend · 1 platform
Status: Shipped

The challenge

Getting sensor data from the field to the cloud over cellular usually means wrestling modems, power, and connectivity plumbing. Blues needed a reference device plus a backend that made device-to-cloud sync boringly reliable at fleet scale.

What we built

The full pipeline, end to end — not a blurb.

01Hardware
An STM32 + cellular sensor node designed around a low-power budget.
02Firmware
Sensor sampling, an outbound queue, robust reconnect, and OTA.
03Backend
A device-routing service with MQTT/HTTPS ingress, per-device state, and webhook fan-out.
04Product
A fleet console with provisioning and usage metrics.
05Operations
Kubernetes with autoscaling.

Results

1.4 s

median device-to-cloud sync over LTE-M

8 µA

node idle draw, a multi-year battery budget

99.95%

message delivery across 12,000 devices

99.7%

OTA success rate across the fleet

Runs as the reference stack for customer deployments.

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