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Stephen Borsay is an AWS IoT Hero, teaching IoT on Udemy. He has designed this tutorial and walk-through IoT lab on AWS to better help you understand serverless IoT implementation on AWS. The tutorial will show you how to send IoT data from your ESP8266 or ESP32 device, through AWS API Gateway, to Lambda, to a data lake in S3, and finally design a static web page for IoT data visualization. It's unlikely the following lab will cost you more than a few cents even if you are no longer on the "AWS free tier"