GoKawiilReading input from an USB Rfid Card Reader
Why Bother
I had this cheap RFID reader lying around in the house. I can't right remember when and why I had bought it. I had some idea for a software, but then I never really needed to have it on the desk, therefore here you go...
When you plug it, it works like a normal keyboards, it just stays there, but then if you swipe a card or an RFID token, it will just write on your standard input, either on a terminal or whatever application you have useful at the moment.
In order to do anything useful with that piece of equipment, I had to capture the input from a single application, making sure it would not be spamming anything else.
The Name of the Beast
It turns out, what I wanted has a name, and is the EVIOCGRAB ioctl. Sure, in C that makes sense, but for higher level software components that's not a thing. I looked for examples around, and of course, Python got you covered.
But for myself I'd rather not depend on some fluffy PythonN library flying around that I need to remember to install dependencies for.
I'd rather go off and implement som kind-of-high-level Golang code.
To find my device, I had to plug it first, and look what I had available with:
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