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A ESP32 Captive Portal written in Arduino C++ (think airport Wi-Fi sign-in page) demo that works on all devices. This code is an example of a captive portal for the ESP32, using the AsyncTCP library.

This will not work with Arduino IDE 1.6.5 (or below) or with non ESP32-S2/S3 devices (e.g. Arduino UNO, Arduino MEGA, etc.). To use this library you need to have Arduino core for the ESP32 installed.