zsquareplusc

12% sounds like one full CPU on a quad core with 8 "threads" (hyperthreading) - you say the loop basically looks like this? what else is there? is the CPU...

I'm not confused by the esptool, I've actually used it myself ;-) The issue seems to be the same as #518

should be fixed by v3.5

you can't open the same port with two processes (on Windows) that's why there is an exception. - for a loop-back connection (connected RX-TX) use the same `ser`object to send...

Reading the description from the descriptor is indeed interesting. But i think it should set `.description` and not `.name`. A drawback will also be that the names won't match with...

Seeing an other start character is in my opinion an error (should not be contained in data). Therefore this would be an transmission error of some sort. - We could...

Unfortunately not, no. Ideally there would be a way to detect and report BREAK conditions (on all platforms...) but pySerial currently does not support that.

the description sounds like a timing problem where the printer can not cope if the characters come in too fast. - if hardware flow control is available on the printer...

if the connection is lost due to an error, then the parameter to `connection_lost` should have the exception object you could print. this is the internal serial port, so USB...

Check out the table "control characters" on page 13 in the manual. Seems the stuff in angle bracket represents just one ASCII character, so e.g. for `` you would use...