This project relies on being able to access other devices associated with a mobile hotspot. 

To test this I configured a basic web server and samba share on my laptop and had it connect to my phone.

Next I used ES File Explorer to access the samba share and browsed to find the standard "it works" Apache web page.

I managed to view and create files on the shared folder.

Crucially, you'd want the device hosting the samba share to have the same IP every time. The android wifi-hotspot uses a pool from 192.168.43.2 - 192.168.43.10. Setting a static IP on the samba server turned out to be no problem at all, by moving it out of the pool e.g. 192.168.43.20 it was still reachable.