ESP32 OTA web firmware and EEPROM/Preferences eraser using esp_http_server.h
07/11/2021 Ed Williams
This is a shell which includes a password protected Over-The-Air firmware update web server which includes the option to erase EEPROM/Preferences. It also includes the following:
- Web implementation is based on esp_http_server.h.
- The use of a static IP address.
- A major fail flashing led notification followed by sleep and reboot.
- Time set using NTP if connected to the internet.
- Mount of SD card.
- Must compile using Default Partition Scheme which supports OTA firmware updates.
- Does not require jquery so works over standalone network.
Visit the web site /updatefirmware and enter the password to upload new firmware to the ESP32. Here is what it looks like:
I use this sketch as a starting point for most of my sketches.
The most important pieces for someone wanting to integrate the web OTA capability in their sketch is to include:
#include <EEPROM.h> // for erasing EEPROM ATO, assumes EEPROM is 512 bytes in size
#include <Update.h> // for flashing new firmware
#include <Preferences.h> // for erasing preferences in the my_app namespace Preferences preferences;
#define uS_TO_S_FACTOR 1000000LL // Conversion factor for micro seconds to seconds
#define TIME_TO_SLEEP5S 5 // Time ESP32 will go to sleep (in seconds)
and the GET and POST uri handler functions for /updatefirmware in the web server config:
updatefirmware_get_handler
updatefirmware_post_handler