AWS IoT Core
Managed cloud service connecting IoT devices to cloud applications
IoT Core is like a communication hub for billions of devices. Imagine millions of sensors, smart devices, or industrial equipment all sending data to the cloud (temperature readings, GPS coordinates, machine status). IoT Core handles device connections (MQTT, HTTPS), authentication (certificates, IAM), and message routing (send data to Lambda, Kinesis, S3). It's like having a massive switchboard that connects devices to cloud services, ensuring messages are delivered securely and reliably. Perfect for IoT applications: smart homes, industrial monitoring, fleet tracking.
IoT Core uses MQTT protocol for device communication. Devices connect using X.509 certificates or IAM credentials. You create things (device representations), policies (permissions), and rules (route messages to AWS services). Rules use SQL-like syntax to filter and transform messages.
Key Capabilities
Key features: device shadows (virtual device state), fleet provisioning (automate device onboarding), and jobs (send commands to devices).
Gotchas & Constraints
Gotcha #1: IoT Core charges per message; optimize message frequency and size to control costs. Gotcha #2: Device certificates must be managed carefully; compromised certificates can't be revoked retroactively. Constraints: Maximum 500,000 concurrent connections per account (request increase), maximum 128KB message size, and maximum 100 rules per account (request increase).
A logistics company tracks 10,000 delivery trucks with GPS devices. Devices send location updates every 30 seconds. They use IoT Core: provision devices with X.509 certificates, configure MQTT topics (truck/{truck_id}/location), and create rules to route messages. Rule 1: send all location updates to Kinesis Data Streams for real-time tracking. Rule 2: if truck speed exceeds 80 mph, invoke Lambda to send alert. Rule 3: store all data in S3 for historical analysis. They use device shadows to track truck status (online/offline, battery level). For firmware updates, they use IoT jobs to send update commands to all trucks, track progress, and retry failures. They process 20 million messages/day, and IoT Core handles it all with sub-second latency.
The Result
real-time fleet tracking, automated alerts, and scalable IoT infrastructure.