I apologize if this question is inappropriate for this forum, but I'm coming up short in my research.
The problem is as follows: I would like to find a network of devices capable of tracking people moving between key areas of a building, and capable of integrating with a REST endpoint upon proximity triggers. E.g. when any person passes a wall-mounted reader within 5-10 feet, an http POST can be sent to a local server.
I had envisioned being able to accomplish this task with RFID-tagged ID cards and large-proximity wall-mounted RFID readers with some kind of USB-ready software. However I was unable to find such a system with my google-fu.
Does anyone have any experience in this general area, or have an interesting thought on a potential home-brew solution? I welcome any and all advice, thank you very much for your time!