ESP32 WiFi Bootstrap is a lightweight, high-performance Wi-Fi provisioning solution for the ESP32. It provides a user-friendly captive portal experience with fast configuration, persistent storage, and full compatibility with ESP-IDF 5.4 or later.
This is an ACME client for ESP (ESP32, etc) devices, so your IoT can fetch their own certificate for secure communication. ACME is a protocol (see RFC8555) for automatic certificate management. Sites such as letsencrypt.org allow you to obtain free (no charge) certificates in an automated way using the ACME protocol.