Smart Cold Chain Alert System
A BLE-to-cloud IoT solution that tracks pharmaceutical and food cargo temperature in transit and fires instant alerts the moment a shipment drifts outside its safe range. Ultra-low-power BLE probes ride with the cargo and stream readings to a ruggedized in-cab telematics gateway, which tags every reading with GPS location and pushes it to the cloud over cellular.
A serverless rules engine evaluates every reading in real time, and the moment a threshold is breached, the system fans out alerts to the web dashboard, the driver's phone, and dispatch - closing the gap between a cooling-unit fault and someone actually noticing it, all within seconds.
The Engineering Challenge: Battery-Powered Cargo Sensing With No Trailer Infrastructure
Cargo-level temperature sensing has to survive years of sub-zero cycling on a single battery, sit inside food-safe, washdown-rated enclosures, and get its data off the trailer without any onboard Wi-Fi or wired infrastructure. Raw temperature logs are worthless to a driver in real time - the real engineering problem is turning a stream of BLE broadcasts into a threshold-aware alert that reaches the right person, on the right channel, within minutes of a fault, while the truck is still on the road and the cargo can still be saved.
- Cargo probes can't be recharged or swapped mid-route, so power budget has to be modeled for multi-year life under sustained sub-zero exposure and trailer vibration.
- Pallets, packaging, and metal shelving attenuate BLE signal unpredictably, risking dropped readings from probes at the back of a fully loaded trailer.
- A threshold breach is only useful if a driver or dispatcher hears about it before the cargo is ruined - every stage from BLE scan to SMS/push has to stay under a minute.
Semconix Hardware & Firmware Architecture
Each cargo-hold probe broadcasts temperature over BLE every few seconds. The in-cab gateway continuously scans for these beacons, parses the readings, appends live GPS coordinates, and publishes the combined payload to the cloud over cellular using MQTT. Cloud-side rule engines evaluate every message against configurable thresholds - for example, a sustained rise above -4°C for more than 5 minutes - and any breach triggers a fan-out to WebSocket-driven dashboards and SMS/push notifications.
Field Execution & Fleet Rollout
The alert pipeline closed the loop from sensor to human response in under a minute, even on moving vehicles with variable cellular coverage, giving fleet operators the visibility to catch a cooling-unit fault before a shipment is lost.
- Delivered end-to-end detection-to-notification latency under 60 seconds, from BLE threshold breach through GPS tagging, MQTT publish, and rules evaluation to SMS/push/dashboard fan-out.
- Maintained reliable BLE reception from probes at the rear of fully loaded trailers by tuning gateway antenna placement, scan windows, and TX power - without shortening probe battery life.
- Modeled and validated a multi-year battery budget for cargo-hold probes operating continuously through sub-zero, high-vibration transit conditions.
Key Features
Ultra-Low-Power BLE Probes
High-accuracy digital temperature sensors in food-safe, IP67 enclosures, broadcasting every few seconds while surviving sub-zero conditions for years on a single battery.
Rugged In-Cab Gateway
A vehicle-grade telematics unit scans for cargo-hold BLE beacons, appends real-time GPS, and bridges the data to the cloud over cellular.
Cellular Backhaul (NB-IoT, LTE-M)
No dependence on trailer Wi-Fi - the gateway pushes payloads over NB-IoT / LTE-M wherever the truck has coverage.
Cloud Rules Engine
AWS IoT Core / Azure IoT Hub ingest MQTT streams; serverless rules and stream processors evaluate telemetry against configurable temperature and time thresholds instantly.
Real-Time Dashboard Updates
WebSockets push live temperature and location data to the dispatcher's web dashboard with no page refresh required.
Automated Multi-Channel Alerts
Twilio and Firebase fire SMS and push notifications directly to the driver the moment a threshold is breached, prompting an immediate cooling-unit check.
Engineering Challenges We Solved
Multi-year battery life in sub-zero, high-vibration conditions
Cargo probes can't be recharged or swapped mid-route. We tuned BLE advertising intervals, sleep cycles, and sensor sampling rate around a modeled multi-year power budget, and validated enclosure and battery chemistry choices against sustained sub-zero exposure and trailer vibration.
Reliable BLE reception through a fully loaded trailer
Pallets, packaging, and metal shelving attenuate BLE signal unpredictably. We positioned the gateway antenna and tuned scan windows and TX power so probes at the back of a fully loaded trailer still reach the cab reliably, without shortening probe battery life.
Sub-minute alert latency end-to-end
A threshold breach is only useful if someone hears about it before the cargo is ruined. We built the pipeline - BLE scan, GPS tagging, MQTT publish, rules evaluation, and SMS/push/WebSocket fan-out - to keep total detection-to-notification latency under a minute, even on a moving vehicle with variable cellular signal.
Technologies Used
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