Reply to SMS Messages with an ESP8266 with Amazon AWS IoT, Lambda, and API Gateway

The guide provides a serverless solution for receiving and replying to SMS and MMS messages using an ESP8266, Amazon AWS IoT, Lambda, and API Gateway. The architecture involves the ESP8266 communicating with AWS IoT, which forwards incoming messages to Lambda, where they are processed and sent back to the ESP8266 via MQTT. The guide covers setting up AWS IoT, creating a mock API with API Gateway, exercising the ESP8266, sending messages, receiving messages, and allowing Lambda to post to MQTT topics. It also provides an example of how to trigger Lambda with API Gateway and configure Twilio webhook URLs.

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