How Amplify PubSub granted access to AWS IoT Core?

Question

As my understanding, there are two required steps. I think only 1) is ok. **Is this redundancy? **

1) From AWS IoT core policies, grant access to cognito_identity_id 
```shell 
aws iot attach-policy --policy-name 'myIoTPolicy' --target ''
```

2) From Cognito side, attach AWSIoTDataAccess and AWSIoTConfigAccess to  Cognito Authenticated Role

Accepted Answer

Hi hai. I agree that it seems like it maybe could be redundant, but it's not. You can try it yourself. If the actions are not specified for the authenticated role as well, it will fail.

https://docs.aws.amazon.com/iot/latest/developerguide/cog-iot-policies.html

> When your app supports authenticated Amazon Cognito identities, in order to authenticate users, you need to specify a policy in two places. Attach an IAM policy to the authenticated Amazon Cognito Identity pool and attach an AWS IoT Core policy to the Amazon Cognito Identity.

https://aws.amazon.com/blogs/iot/configuring-cognito-user-pools-to-communicate-with-aws-iot-core/

> An Amazon Cognito authenticated user needs two policies to access AWS IoT. The first policy is attached to the role of the authenticated pool to authenticate and authorize the Cognito user to communicate with AWS IoT. The second policy is attached to the authenticated Cognito user ID principal for fine-grained permissions.

How Amplify PubSub granted access to AWS IoT Core?

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