OTA updates for Finder Opta using PLC IDE

This example contains a fully functional project that provides guidance on how to implement OTA updates on the Finder Opta using Arduino PLC IDE. In particular, the C++ sketch in this project downloads and applies a remote update on the Finder Opta, while the Ladder diagram notifies the status of the operation using the LEDs of the device.

Usage

Once you have a server that can serve a .ota file to the Finder Opta via Ethernet, extract the .zip file and open the project in PLC IDE. Next, edit the update path in the sketch:

#include <Arduino.h>
#include <Portenta_Ethernet.h>
#include <Arduino_Portenta_OTA.h>

const char *filename = "http://your.server:port/your_file.OTA";

void setup()
{
    ...

Now you can upload the code to the Finder Opta and see the update take place in real time!

Running an update server

If you do not have a server that can provide OTA updates but you still would like to test out this example, we provide a .ota in the assets subfolder of this directory. The easiest way to serve this file to the Finder Opta would be the barebone Python HTTP server. To do so, execute the following command in the root directory of this project:

python3 -m http.server -d ./assets -b <IP_ADDRESS>

Now simply edit the update path in the sketch using the same IP address provided in the above command. The provided .ota file, contains a sketch that will make the LEDs blink, so that you can easily tell when the update has been applied.

Creating your own .ota file

To create a custom .ota file, start from a sketch and follow these steps:

1. In Arduino IDE select Sketch->Export compiled Binary from the menu or, if using arduino-cli use the --export-binaries command line option.
2. From the command line, execute the bin2ota.py program that can be found in the extras/make-ota folder:

python3 extras/make-ota/bin2ota.py OPTA yoursketch.bin yoursketch.OTA

Finally, remember to update the path in the updater sketch.

Resources

• Arduino PLC IDE Setup & Device License Activation

Contact

For communication reach out to iot@dndg.it.