JarvisButton: how to invoke multiple AWS Lambda with one AWS IoT Button (not Enterprise ed.)

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Introduction If you have an AWS account in Free Tier, bla bla bla ok stop: I am a AWS Lambda maniac. I only wrote about them (here, here). In this article, I want to talk about my new purchase that is - of course - related to AWS Lambda: the AWS IoT Button. It first made its appearance on the IoT scene in October of 2015 at AWS re:Invent with the introduction of the AWS IoT service.