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The AWS SDKs don't support connecting to AWS IoT using the MQTT/mTLS protocol, so don't support certificate based authentication. With the AWS SDKs you can only publish messages to AWS IoT using the HTTPS protocol and AWS credentials as explained in the JS SDK v3 doc here
If you want to use the MQTT protocol, you have several options
- The PubSub component of the AWS amplify library support connecting to AWS IoT using MQTT over WebSocket from a browser using Amazon Cognito/AWS STS token for authentication.
If you want to connect to AWS IoT using MQTT and certificate based authentication, take a look at MQTT.js
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