I use Build_in Function File to read and write binary data file. This works great.
Just append array and the filename can be longer than 8.3 char. And it has a file open menu.
But I also need a second file to write and read some setup infos.
With Build_in Function File, I think it's need a additional command like read/write string
On the embedded with the ESP32 on micro sd-card this works easy and good.
Also with the App developer, with the scada component works nice.
regards
Stefan
How the setup.txt demo-file look like.
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