I'm planning to build a remote controlled car based on either a Raspberry Pi 3 or a Raspberry Pi Zero (the one with bluetooth and WiFi).
Currently I'm struggeling with how to communicate with the Pi. My first try was using bluetooth but I had some problems getting the bluetooth module to run and connect to it with my mobile phone. What I'm more experienced with is simply using WiFi. It's (in my opinion) much easier to develop for, both server and client, and use existing libraries, protocols etc.
The only problem I have with it now: Raspberry Pi and the mobile phone need to be in the same network, which wouldn't work if I take the Pi outside to run the car in the park for example.
I'm wondering if it is possible to make the Pi a "router" so any device can connect to the Pi's WiFi and start communicating with it (of course it's not a real router, I know)? I read about ad-hoc networks and access-points, but I'm not sure which one would suit my requirements best.