This function is the Hello World example from the AWS Greengrass Core C SDK. It also contains the rest of the C examples from that repo so it can be reconfigured to run any of those functions.
The build script in this directory uses Docker to build the AWS C++ SDK and the example functions. Even on a fast machine this may take hours the first time the build runs with Dockerfile.full. The normal Dockerfile pulls a pre-built image from Dockerhub.
If the Docker host is not X86_64 the build script will not work.
If this function is launched successfully then you should expect to see the message hello world! on the hello/world topic every few seconds.