What it is
AWS IoT Core is a managed Amazon Web Services service that connects internet-connected devices to the cloud. Devices talk to it mostly over MQTT, and it also accepts HTTPS and MQTT over WebSockets. Each device, called a thing, authenticates with its own X.509 certificate, and IoT policies decide which topics it may publish or subscribe to. AWS runs the message broker, so there is no broker server to patch or scale.
Around the broker sit the features that make it useful. Device Shadows keep a stored copy of a device's last reported and desired state, so apps can read or change it while the device is offline. The rules engine uses SQL-like statements to route messages to other services such as Lambda, DynamoDB, S3 or CloudWatch. Jobs pushes remote operations, such as config changes or updates, out to a fleet of devices.
How I use it
- The pattern I build with: each device gets its own X.509 certificate and a narrow policy that only allows its own topics.
- Devices such as a Raspberry Pi with sensors publish power-on, usage and location readings over MQTT, from Wi-Fi or a cellular modem.
- Rules route those messages on to the AWS services that store, alert and display them, such as Lambda, DynamoDB and CloudWatch.
- Device Shadows hold each machine's last known state, so a dashboard can show it even when the unit is out of coverage.
- The goal is to track, monitor, measure, view and read anything with AI, using the same AWS account the rest of my stack runs on.
IoT Core is the right tool when devices in the field need to send readings to AWS without me running and securing my own broker. Per-device certificates mean one lost unit can be revoked without touching the rest. The rules engine hands each message straight to the services I already use, so a sensor on a machine can end up in a database, a dashboard and an AI summary with very little glue code.
Questions
Can you connect field equipment to AWS?
Yes. The pattern I build with puts a Raspberry Pi and sensors on the machine, connects it to AWS IoT Core with its own certificate, and routes the readings into AWS services for storage, alerts and dashboards. A cellular modem lets it report from anywhere.
Do you need to run your own MQTT broker with AWS IoT Core?
No. AWS runs the broker. You register devices, issue certificates and write policies and rules, and AWS handles the connections.
How do devices stay secure in AWS IoT Core?
Each device authenticates with its own X.509 certificate over TLS, and a policy limits which topics it can use. A certificate can be revoked for a single device without affecting the others.