ReactNativeEspressif app for iPhone and iPad
This app sends to a ESP32 device the SSID and passphrase to which the IoT device will connect to.
It is a react native app, the code is under MIT licence: https://github.com/airboxlab/react-native-espressif
It features a number of debug information and is meant at testing your firmware build when you are developing with Espressif ESP32 chip.