Approaches to incorporating sensor data

Hi,

I'm new to Unity and AR Foundation, so please pardon loose terminology. I've seen Unity can be great for developing apps for both iOS and Android, and that it can handle object placement, animations, and other triggers via C# scripting.

What I haven't seen from tutorials is an entry point where one would incorporate custom input. For example, if I want to use the direction-finding capability of Bluetooth 5.1 to locate a real object (or something like a text message containing coordinates), would I need to create a plugin outside Unity, then call it from a C# script?

How do you guys approach these types of problems?