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Reverse Engineering a Thermal Label Printer

Last week while I was out shopping, I found a little sort-of-egg-shaped thermal label printer. I didn’t really need (another) label printer but I got it because the box said it supported Bluetooth and I really wanted to know how the “official app” communicated with it. I spent the next three days going down a rabbit hole of learning very specific information about thermal printers, and discovered that the printer I had bought was both very similar and very different to existing thermal printers!