AWS-Connected Fleet Telematics Gateway

Project Overview

Built a production fleet telematics gateway deployed in 2,000+ commercial vehicles. The device reads OBD-II data from the vehicle CAN bus, processes it locally for anomaly detection, and streams telemetry to AWS IoT Core over LTE with sub-50ms end-to-end latency.

Yocto BSP Development

Created a custom meta-fleet-gw Yocto layer for the NXP i.MX8M Mini SoC:

• Custom machine config with optimized kernel (6.1 LTS) — stripped to 4.2s boot time
• Custom OBD-II kernel driver for ISO 15765-4 CAN and ISO 9141 serial protocols
• Systemd services for telemetry daemon, OTA watchdog, and BLE peripheral manager
• A/B partition layout with SWUpdate + U-Boot boot counter for safe OTA rollback

AWS Greengrass OTA Pipeline

# Greengrass component — telemetry publisher
ComponentName: com.fleet.TelemetryPublisher
ComponentVersion: 2.1.0

Manifests:
  - Platform: {os: linux}
    Lifecycle:
      Run:
        Script: |
          python3 /opt/fleet/telemetry_daemon.py             --endpoint $AWS_IOT_ENDPOINT             --topic fleet/{device_id}/telemetry             --interval 1000

Edge Anomaly Detection

Trained a 4-class TFLite model on Engine RPM, throttle position, coolant temp, and MAF sensor data to detect: harsh braking, over-revving, idling excess, and sensor fault. Running at 4ms inference on Cortex-A53 — triggers cloud alert within 200ms of anomaly detection.

Results

• Reduced cellular data cost by 62% using delta OTA (320MB → 18MB average update)
• 99.7% fleet uptime over 18 months with zero bricked devices (A/B rollback)
• Anomaly detection reduced roadside breakdowns by 23% in first 6 months

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