Yes sir. You can use 12v WiFi controllers for LED strips and have a hotspot connecting them. My wireless CarPlay radio won’t allow my phone to have a hotspot, as it uses WiFi to work. But, if I plugged my phone into it, I could use a hotspot. I might have to try this out soon.
Could you theoretically rig a system of lights in your car and hook it up to that it would it need it’s own hotspot to run off of
Yes sir. You can use 12v WiFi controllers for LED strips and have a hotspot connecting them. My wireless CarPlay radio won’t allow my phone to have a hotspot, as it uses WiFi to work. But, if I plugged my phone into it, I could use a hotspot. I might have to try this out soon.
Does this need home assistant cloud?
No, it is native in the latest app version. You would need to use port forwarding though.