IoT Connect with Cognito Authenticated users

Question

Hi - I am trying to write a python test client that uses a verified and authenticated user to pub/sub on IoT Core. It is failing when trying to get the result() of the connect_future (to IoT). The failure is:

TRACE] [2024-01-11T14:33:26Z] [000000016b4fb000] [http-stream] - id=0x1119cfbd0: Incoming header: x-amzn-ErrorType: ResourceNotFoundException:
[TRACE] [2024-01-11T14:33:26Z] [000000016b4fb000] [http-stream] - id=0x1119cfbd0: Incoming header: x-amzn-ErrorMessage: Identity ':' not found.
[DEBUG] [2024-01-11T14:33:26Z] [000000016b4fb000] [http-stream] - id=0x1119cfbd0: Client request complete, response status: 400 (Bad Request).
[DEBUG] [2024-01-11T14:33:26Z] [000000016b4fb000] [AuthCredentialsProvider] - (id=0x111974e20): **GetCredentialsForIdentity** call completed with http status 400

Clearly it can't find the Identity ID I am sending. I have tried with the users 'sub', I have tried with :user sub. Neither worked. I have seen lots of posts on getting the right ID, but I cannot seem to find what it might be. Definitely not for lack of trying

My code snippet to create the provider is:

cognito_id_pool_endpoint = f"cognito-identity.{cmdData.input_signing_region}.amazonaws.com"
    l = [('cognito-idp.us-east-1.amazonaws.com/{user pool id}', accesstoken)] THE USER POOL
    provider = auth.AwsCredentialsProvider.new_cognito(
        endpoint=cognito_id_pool_endpoint,
        identity=identity_id, THIS IS THE ERRORED VALUE, I BELIEVE
        logins=l,
        tls_ctx=io.ClientTlsContext(io.TlsContextOptions()))

My code to use the provider is:

-- Create connection builder

mqtt_connection = mqtt_connection_builder.websockets_with_default_aws_signing(
        endpoint=os.getenv('IOT_ENDPOINT'),
        region=os.getenv('IOT_REGION'),
        client_id=f'mydevice:{uuid.uuid4()}',
        on_connection_failure=on_connection_failure,
        credentials_provider=provider)

connect_future = mqtt_connection.connect()

connect_future.result() -- THIS IS THE EXCEPTION
Thank you!

Accepted Answer

I actually found the solution to this after MANY hours of tracing and documentation. In all of the examples given to use Cognito authenticated identities with IoT Core pub/sub, there is one key API call left out:

id_client = boto3.client('cognito-identity')
    id_response = id_client.get_id(
    AccountId=os.getenv('AWS_ACCOUNT_ID'), -- AWS Account ID - I don't like this.
    IdentityPoolId=os.getenv('COGNITO_IDENTITY_POOL_ID'), 
    Logins={
        os.getenv('COGNITO_USER_POOL_URL'): idtoken --from initiate_auth authentication result
        }
    )

identityId = id_response['IdentityId'] -- You need this for the call to new_cognito(...)

This call comes after initiate_auth(...) and before auth.AwsCredentialsProvider.new_cognito(...) identity kwarg

IoT Connect with Cognito Authenticated users

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