Print multiple copies at once

[melkumovarthur]

Hi,

Thank you so much for your amazing work on this library—it's been incredibly helpful!

I'm using your library with a Niimbot D11h and USB-Con on a Linux PC, and overall, it's been a great experience. However, I encountered an issue when trying to print multiple copies at once.

I noticed the commented line in print.py:
# self.set_quantity(1) # Same thing (B21)

When I uncomment it and set the value to, say, 2, it doesn't seem to have any effect (still prints 1pcs). Is there a way to print multiple stickers at once using your library?

Thanks again for your hard work, and I appreciate your help!

[MultiMote]

For d11h print quantity is encoded to SetPageSize(0x13) packet (6 data bytes). Also total page count should be encoded to PrintStart(0x01) packet (7 data bytes).

See the reference implementation here:

https://github.com/MultiMote/niimbluelib/blob/main/src/print_tasks/B1PrintTask.ts#L9-L29

https://github.com/MultiMote/niimbluelib/blob/4e1199338074aab030638b47304c3a3e0ad78564/src/packets/packet_generator.ts#L169

https://github.com/MultiMote/niimbluelib/blob/main/src/packets/packet_generator.ts#L110-L114