This is exactly why, PlatformIO or Arduino, which Sketch, etc., I asked for instructions.
If I sell such products, I also have to provide instructions on how to use them. And by that I don't just mean plug it in and use it. The products are specifically designated as a development board. Then I want to be able to “develop” with it. But if I have to start from scratch because there are no useful instructions, I can also assemble the hardware myself.
I bought these modules and was hoping for some convenience so that I didn't have to start from scratch and could implement my project quickly.
Really very unfortunate!