netclients: notifying myself about new devices at home

I occasionally look at my router's list of known devices and it always shows a long list. I know most devices but not all and the unknown devices make me a bit uncomfortable because I never know what is spying on me nowadays. If a new device appeared a few days ago, then I usually know what it was. If I see a device from 7 months ago, then I don't know what it was and that bothers my perfectionist self. It would be nice if I could get a notification when a new device is added and I could attach a comment to it. But alas my router doesn't provide such functionality. But wait a moment, nowadays coding is very easy so maybe I could write my own little tool for this? So that's what I ended up doing. This post is just a slice-of-life look at how I approached it. Figuring out how to read such a list programmatically from Go would be quite a long research undertaking for me. Not so in the AI age; it's very good at finding the details you need. I have a Fritz!Box router and it turns out it…