OTA Update - dalathegreat/Battery-Emulator GitHub Wiki

What is OTA?

Over-the-Air (OTA) update is a mechanism that allows firmware updates to be deployed to ESP32 devices wirelessly, eliminating the need for physical connections. The Battery-Emulator uses the library Elegant OTA to achieve this.

Prerequisites

Before being able to use OTA update, ensure you have the following prerequisites:

  • A Wifi connection established to the board
    • Either a direct connection to the board (192.168.4.1 IP after connecting to the BatteryEmulator network (default password 123456789)
    • OR a connection via a router (see quickstart video for how to connect Battery-Emulator hardware directly to your home network)

[!TIP] Starting from version 7.0.0 , many settings are stored to persistent memory. This means that all the things you configure in Webserver (Wifi settings, max charge/discharge rate, SOC scaling settings, Battery capacity) don't have to be configured again. The system will use the previously set settings automatically!

Getting the updated file

You can download the latest release from Github Releases section

After opening the release you want to update to, at the bottom of the page select the .bin file that matches your hardware

Performing the OTA update

  • Start by navigating to the web address (Note that IP will be different compared to direct / router connection)
  • At the bottom of the page, click the "Perform OTA update"
  • On the ElegantOTA page, select the "Select file" option

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  • Select the .bin file that you want to update to

  • Flashing will commence, once completed you will see this message:

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  • Congratulations, you have now updated the firmware remotely over the air! 🥳

Troubleshooting

If you see "Upload failed" or some other error code, you can try the following things

  • Make sure you are sending the right .bin file for the correct hardware
  • Improve Wifi coverage if signal is weak, remove obstructions if needed
  • OTA updating from another device (Laptops are better than smartphones)
  • Connect directly to the AccessPoint network broadcasted by the Battery-Emulator, stand near the device, and send the OTA file