[Nut-upsdev] blazer_usb: compatibility with Ippon BackPro UPSes (Phoenix Power Co., Ltd usb-to-serial controller)

[Arjen de Korte]

Citeren Alexey Loukianov <mooroon2 op mail.ru>:

> So, in case there's an EPIPE condition which can't be cleared using
> usb_clear_halt(), or there's "Timer expired" condition (errno -62 - don't
> remember what is the correct E-alias for it)

That's usually ETIME.

> - it might be worth try to do
> usb_reset on device as a last resort (and then to re-enumerate the bus and
> reopen the device).

This is a bit tricky. I'm not sure if we can still (or need to) call  
usb_close() on the device handle after that. This might be very much  
depending on the OS in use. On Linux you should not call usb_close()  
in some cases, since that might cause a double free corruption and  
should in other cases. So if we can avoid it, that would probably be a  
safer option (although I added something to the trunk that tries  
anyway).

Best regards, Arjen
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