Hi,

when using serial.tools.list_ports_windows, the serial number of the USB serial port may be truncated. I have just come across this issue when using the default settings of an Atmel microcontroller for a usb-serial interface, such as in
http://asf.atmel.com/docs/latest/uc3l/html/udc_use_case_2.html

The default serial number used by Atmel is "12...EF". Now, list_port_windows.py restricts the serial number of a hardware ID (see line 213 for "USB" devices, and probably also line 251 for "FTDIBUS" devices) in the grep command to \w , i.e. [a-zA-Z0-9_]. In my opinion, it should rather be \S (oder similar), to allow the full set of characters in the serial number.

Kind Regards
Joerg