Com port failed to connect in Visual Studio?

Development
1

Uploading to devices was working fine, up until a couple of days ago.
Now I get error:
serial.serialutil.SerialException: could not open port ‘/dev/cu.SLAB_USBtoUART’: FileNotFoundError(2, ‘The system cannot find the path specified.’, None, 3)
The only way i could get it working again was. access the COM port directly by

commenting this out:
//upload_port = /dev/cu.SLAB_USBtoUART
//monitor_port = /dev/cu.SLAB_USBtoUART

And adding this in
upload_port = COM4 //added this to get it working.
monitor_port = COM4 //
but i have to run Arduino IDE to check what port my modules are on and edit above to match the port each time. I have loaded the drivers again in Windows 10. But problem persists?

3

The cu slab thing is due to a check-in to platformio.ini. it is what osx calls serial ports. We should probably just comment that line out in source control. Because it is different for all three oses.

4

Yeah, that’s my bad. That should not have been checked in.