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AWS Greengrass
User Guide

Verify the Lambda function is running on your AWS Greengrass core device

In the AWS IoT console, choose Test.

In Subscription topic, type hello/world, and then choose Subscribe to topic to subscribe to the hello/world topic.

If the hello world Lambda function is running on your AWS Greengrass core device, it publishes messages to the hello/world topic and is displayed in the AWS IoT console: