I want to build up a rc car on my own which I can connect/steer via an app - either smartphone or computer. Not decided, yet. I also want to use multiple cars, each for a friend so let's say in the end I will likely use 3-5 but maybe also even 10. What would be the most efficient wlan module for that? I think I will need a battery or at least I'm not aware of any other energy supply. At the moment I am using an ESP WROOM 32 from NodeMCU. Is that promising or is there maybe another module more useful?