What is this

EOTAUpdate is a library for ESP32 that can periodically check for available updates, fetch and flash them with minimal configuration.

• It works over secured and non-secured HTTP connections.
• It fetches a text file that states which is the latest version and where to find it
• By default it checks for updates every hour

Setup

• Copy the file ota/cfg.txt to a server that can be reached by your ESP32 and update the fields as needed.

• The file contains four lines, the URL to the firmware to install, a number representing its version, an optional MD5 of the binary and an optional description of the version. If not including optional field, leave an empty line in its place.

• Add the following lines to the beginning your main.cpp

  #include <EOTAUpdate.h>
  const unsigned VERSION_NUMBER = 1;
  const String   UPDATE_URL     = "https://myserver/ota/cfg.txt";
  EOTAUpdate updater(UPDATE_URL, VERSION_NUMBER);
  

• And in the loop() function call:

  updater.CheckAndUpdate();
  

Release an update

When releasing an update remember to

• Update the constant VERSION_NUMBER in your code, otherwise you might end up with an update loop
• Upload the firmware to the sever
• Update the cfg.txt with the newly released version number and string