[Nut-upsdev] NUT: new blazer_usb subdriver proposal

[Aurélien Grenotton]

Hello,

I've recently bought two cheap UPS (http://www.ldlc.com/fiche/PB00109242.html).
They're not supported natively by NUT (even though the monitoring
software is UPSilon from megatec).
After some investigation, they almost use the krauler-type
communication already supported in the blazer_usb driver. However, the
UPS won't reply if the language ID is not 0x4095...
Therefore, I cloned the krauler_command, adding the language ID and
unicode to ASCII conversion (taken from libusb). I also enhanced the
error!retry mechanism, as the UPS fails to reply quite often.

Please see the attached patch file.

Any comment would me more than welcome.

Rgds,
Aurélien
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