App Inventor - Indoor Positioning System?

Hello, experts of App Inventor. I want to create a project for indoor positioning using App Inventor, but I have limited knowledge on the subject. After reading this resource(below link), is it possible to implement indoor positioning? In the paper, what does "using three different beacons to calculate a location" mean? What types of sensors do I need to purchase beforehand? After obtaining the sensors, does it mean I can use them immediately with App Inventor?

https://bit.comp.polyu.edu.hk/blepositioning/index.html

How old is the paper and its extensions?

Have they been updated to work on recent android versions?

Who authored the paper, and where did they post the source code?

The hardware sounds like those cheap disappointing key finder fobs.

Good thing it's Cyber Monday and there are sales.

You will need some starter list knowledge.

It appears no one in this community knows anything about these two extensions other than what is in the link you posted.

You could ask someone on the teaching staff at Academic and Teaching Staff | Department of Computing to get more information.