Turning a Bluetooth Caliper into a FreeCAD Input Device

When I spotted a used Sylvac S_Cal EVO caliper on eBay for €90, I jumped on it. Swiss-made precision instruments don’t usually fall into hobby budgets, but here was my chance: a Bluetooth-enabled digital caliper that normally costs 3-4× as much. I thought I was buying a better measuring tool. I didn’t realize I was buying a new FreeCAD input device. TL;DR I’ve developed a Python library,…