USB Serial support #1
Description
There is a huge market for older Epson printers that are serial-only. There is a huge market for clones of various models of Epson printers, many of which are serial only or use a usb-to-serial module embedded in the printer. Supporting Web Serial would add a huge swath of receipt printers to the list of supported equipment.
The library is designed to support additonal communication channels other than USB. Add a SerialDeviceChannel and make any changes necessary to ensure it works.