Detach kernel driver on backend initialization#1
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…universal usage. Included all parameters defined in the raster command reference for the P700. Added the possibility to print multiple copies. Implemented waiting for the printing process.
…aken if none is provided
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In the latest ubuntu version the usblp driver is loaded automatically for the label printer when the device is plugged in (at least in my system). Because of that the device is always busy when you try to send something to the device using PyUSB. As soon as this driver is detached, the library works as expected.