In this third episode of my cloud-to-device series, I'm talking in some more detail about why it is a questionable and sometime outright dangerous strategy to let small devices actively listen on a network and, through that, open itself up to unsolicited traffic it needs to triage and secure. As a counterproposal I'm showing a very simple model for how to create a much safer way (even if not yet truly secure, we'll get to the in future episodes) of exposing a device to public network consumers - through use of a cloud based gateway that acts on behalf of the device and does a lot of the heavy lifting in terms of protocol implementation but also for defense against unwanted traffic. The code for this episode can be found here: https://github.com/clemensv/D2C-Ep3-LedBlinker [Part 1] [Part 2] [Part 4] [Part 5]