ESP32 Forum

On the ESP32 (micropython, not Arduino) for OTA updates, do rollbacks occur by default, or does the CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE need to be set in the menuconfig for this to happen? Also, does any manual code need to be added to the firmware for rollback to occur?

Yes, rollback feature has following 2 requirements:

1. Enable `CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE` option in the project
2. Use following APIs in the application to set correct rollback status
Please refer to https://blog.espressif.com/ota-updates- ... 5438e30c12 for more information.

@ESP_Mahavir

Thank you for the response. Where should I put these lines of code in my program?

Also, I don't understand how I could use the invalid line. It seems invalid should be assumed if the valid line is never run?

Hello,

Thank you for the response. Where should I put these lines of code in my program?

This you will have to decide on when you can safely consider the new image as valid and cancel the rollback process. In some case, a new firmware connecting to Wi-Fi network or a cloud endpoint is considered to be a good checkpoint. Please see the blog post I linked in my earlier comment.

Also, I don't understand how I could use the invalid line. It seems invalid should be assumed if the valid line is never run?

Calling the API `esp_ota_mark_app_invalid_rollback_and_reboot` is optional and can be based on some diagnostic runs on the new firmware image. Please have a look at the examples under `examples/system/ota/` from IDF and how you can use different APIs.

Thank you. So if I enable the option, the minimum I need to do is add this line to my code?

// Mark firmware as valid and cancel rollback process
esp_ota_mark_app_valid_cancel_rollback();

How quickly after startup do I need to call this function before it auto rolls back to the previous version? Assuming that is what happens.

Hi @ESP_Mahavir,
Did you see my last post?

Thanks
Robert