OK, so it is some kind of power and not any usb. Thanks.
I already used the included usb for power like it said in the docs to quickly test it. But, I have a breadboard with another power source so it is not really needed.
Yes, they sell uart adapters like this:
https://www.amazon.com/RobotDyn-Serial-Converter-adapter-CH340G/dp/B072637KDKI was hoping to send data to and from the device without using an adapter (I live in Brazil and shipping takes almost 6-8 months). Right now, I have to use a microsd card back and forth to the computer, which is ridiculous.
There is also, on the side, some pads for some on-board programming I think?
Maybe do something *kind of like* this:
http://fab.cba.mit.edu/content/archive/projects/fabisp/Thanks,
Vidarr
edit: I don't know if I make sense. Translate the technical is hard so I try to make it short, but it seems not right. When I read what I wrote above, it is not exactly what I want to say.
Maybe I say to make sense:
Need to read/write to display without transferring data with microsd card, or buying a uart/usb adapter. Is there some connections I can make to the circuit board to do this? There was no documentation coming with the display. Nothing on Nextion site to explain this. Contacted Nextion - they said closed and will not discuss.