something didnt work properly under Catalina¡still trying to trace the issue,
something to do with the serial ports
I cannot even use High Sierra because of driver (and Java) issues.
macOS has become more restrictive about 3d party kernel extensions or kexts.
"They act as drivers ¡ª if you like a Windows analogy ¡ª and give access to your Mac¡¯s hardware."
Something done on previous macOS that was inherited by Catalina update
could be at issue. Check 'Security & Privacy' under 'System Preferences'
"If a user space driver quits unexpectedly or you restart your Mac,
you might need to unplug and reattach the accessory cable to enumerate the driver. (50042397)"
"Driver extensions might not launch on-demand after installation. (51229724)
Workaround: Disable System Integrity Protection"
CH340 driver
Oristo