Is it secure to publish a message to AWS IOT topic without specifying AWS IOT endpoint within AWS?

[SalikSayyed]

Hi,

From within AWS Lambda,

Earlier with aws sdk v2 we were creating a iot client specifying AWS IOT endpoint and publishing a message to IOT topic.
But now after v3 upgrade, we have to use IotDataPlaneClient, and we are able to publish message to IOT topic from AWS Lambda.
But I have concern since we have not specified iot endpoint, is the communication from AWS Lambda to AWS IOT secure and encrypted?

Thanks.

Earlier in v2 :
`const AWS = require('aws-sdk');

let iot = new AWS.IotData({
endpoint : ''
});

iot.publish(params,callback);`

Now in v3 : as per example given in @aws-sdk/client-iot-data-plane

`import { IoTDataPlaneClient, PublishCommand } from "@aws-sdk/client-iot-data-plane";

const client = new IoTDataPlaneClient({
region: "us-east-1",
});

const response = client.send(new PublishCommand(params));`

Thanks.