ESP32 HTTP Firmware Update (OTA)

ESP Clone of https://github.com/esp8266/Arduino/tree/master/libraries/ESP8266httpUpdate (most work done by Markus Sattler).

TL;DR

This is just a quick port of ESP8266httpUpdate for ESP32. It is already deprecated, since Arduino Framework for ESP32 added this support officially. See: https://github.com/espressif/arduino-esp32/tree/master/libraries/Update

Buildable with Arduino framework for ESP32.

There are things remaining to be solved:

• Some headers are deprecated (will change for ESP32 anyway)
• Download to SPIFFS with AES-256 decryption
• Does not support ESP-IDF.