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Is there a way to write directly to EP of USB printer connected to Raspberry Pi 3?

When I try to write to usb directly i get write error: Invalid argument:

echo 1 > /dev/bus/usb/001/004
-su: echo: write error: Invalid argument

I see this was once possible. I need raw interface for upgrade of the printer :(

Any idea why this is failing?

1 Answer 1

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finally found out myself how.

To be able to write raw data to printer usb device (could be also for others not just printer) use the usblp module.

modprobe usblp
echo 1 > /deb/usb/lp0

Could be that you also need to setup appropriate UDEV rules...

Hope it helps...

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