How to measure distance and move it to a Raspberry

Hello, sorry if this is too basic but I’m really new and I’m having problems doing this:
I want to measure distance between an anchor (just one) and a tag and reading it into a Raspberry but I don’t know how to do it.

Could anyone give me the steps I have to follow or a kind of guide so I can start searching information with a base? There’s a lot of documentation and it’s difficult to know what I need for my purpose and what don’t.
Thank you in advance!

Hi @electronic_user_1
the easiest way would be to start with PANS firmware - check this web page & documentation