Publish to IoT Thing from Lambda Javascript Example

Hi folks. We have developed an IoT application and all is going great with the receiving of messages from our IoT Device to trigger Lambda's. The next step is to Publish messages from a Lambda to the device using JavaScript. I can successfully Publish back to the device using the Test option from the web console. I can't seem to find JavaScript sample Lambda code that shows how to connect to a specific Thing and then Publish to it. Would also need to understand the security required for the Lambda connection to the Thing (ie. does the Lambda have to load the same certificates used by the IoT Device).

I appreciate any help.

Thanks. Grant.