try underscore?

esp gpio19 connect to miso AND t_do ....
check your photo...

The lcd spi pins and touch spi pins short wire my pins, but check setting in your used library... ESP | ILI9341 | TOUCH | --------|---------|--------- GPIO2 | DC | | GPIO17 | | TPCS | GPIOxx | | TIRQ | none if tft espi lib GPIO19 | MISO | TDO | GPIO23 | MOSI | TDIN | GPIO18 | CLK | TCK | GPIO15 | lc...

try
or try
String base64image = (String) "id=7292&num=" + (String)num + (String) .............. ;

use (String) before contant?
...= (String)"id=7292&num="...

Yes, directly. I use this ch340 adapter https://www.aliexpress.com/item/32789451759.html?spm=a2g0s.9042311.0.0.27424c4dl0bJvQ This adapter connector does not have a DTR signal but a wire soldered directly to the ch340 pin, The power jumper select 3,3V position on adapter. The usb 5V power signal is ...

Hi!
The takeNewPhoto variables don't setting never.

Use another type usb/serial converter/adapter. Before buy check connector pinout, or chip type on adapter. In adapter if not wire the required signal to connector, then wire directly from chip pin. Check power/gpio voltage level on adapter, and select 3V3 type. I use simple wiring, RX,TX, GND, RTS t...

Communication only usb host between usb device.
Two usb devices do not communicate with each other

find and try PS2 keyboard arduino lib, or find arduino usb host module and library ...
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https://www.google.com/search?client=af ... st%20esp32