Securely Connecting an Arduino MKR WiFi 1010 to AWS IoT Core

In this tutorial, you’ll learn how to connect your Arduino MKR WiFi 1010 (or MKR 1000) board securely to AWS IoT Core.

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Introduction
AWS IoT Core is a managed cloud service that lets connected devices easily and securely interact with cloud applications and other devices. AWS IoT Core can support billions of devices and trillions of messages, and can process and route those messages to AWS endpoints and to other devices reliably and securely.
Devices can connect to AWS IoT Core using the following protocols: HTTP, WebSockets and MQTT. This tutorial will walk you through how to connect an Arduino MKR WiFi 1010 (or MKR1000) board securely to AWS IoT Core using the MQTT protocol. MQTT (Message Queuing Telemetry Transport) is an extremely lightweight M2M (machine-to-machine) connectivity protocol which provides a messaging subscription and publish transport.

When connecting to AWS IoT Core using MQTT, devices are required to use X.509 certificates with TLS for authentication, as AWS IoT Core does not support authentication via username and password like many other MQTT broker services provide support for. More information on X.509 certificate support on AWS IoT can be found here.

Every Arduino MKR board with on-board connectivity, including the MKR WiFi 1010, is equipped with a Microchip ATECC508A or ATECC608A crypto element. This crypto element can be used to securely generate and store a 256-bit ECC (Elliptic Curve Cryptography) key. 256-bit ECC keys have an equivalent strength to 3072-bit RSA keys (more information can be found here).”

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