Arduino Nano + HC-05 4WD Rover?

[psoro]

You can use control your ESP from outside using your smartphone as Hotspot.
If you want to prepare your ESP to be connected to several routers, there’re several ways to achieve it, using Blynk Provisioning, WifiManager or wifiMulti, see below for wifiMulti option:

WiFi backup connection

Is it possible to add a fault-back connection to another SSID (router)? If not, please consider to add in the future. It will give more reliable connections, especially when develop security apps.