20ms delay

[A13xund3r]

I was repairing BTT GTR V1 mainboard at work and took opportunity to check how does ESP3D communicate during file upload. So this is scope screenshot, yellow line is data sent by ESP3D, blue line is GTR response.

As you can see GTR respond literally immediately after ESP finish line, I didn't sniffed what it is but I'm 100% sure it is "OK". So why ESP wait 20ms before it send another line? I suspect it is safety measure to give mainboard time to process data it just received but I expect it is already processed when it reply "OK". Also BTT GTR is a monster comparing to any Atmel based controller so I think we can play with shorter or no delay at all. At least it could be available as adjustable option in settings.