Delayed availability of USB instance of GenericESCPOS

[anoraxx]

When instantiating a USB printer under Windows 11 using libsusb and class escpos.impl.epson.GenericESCPOS I discovered that you have to put in a delay of at least ~130 ms before calling init(). Otherwise there will be an error by libusb (or Windows, actually?) that the device could not be opened.

Quick'n'dirty™ workaround:

while True:
    try:
        printer.init()
    except:
        continue
    else:
        break