AWS IoT Core
AWS IoT Core lets you connect physical devices to the cloud. It handles the heavy lifting of device authentication, message routing, and rule execution. You get a managed infrastructure to ingest telemetry data without building your own broker. It is a foundational piece for any serious IoT architecture on AWS.
This fits teams already invested in the AWS ecosystem who need a reliable, scalable connection layer. Since there is no free tier, you pay for every message processed. The pay-as-you-go model means costs scale directly with device activity. Be prepared for variable bills if your fleet grows unexpectedly.