On 26/12/2019 10:37, Till Kamppeter wrote:
Here I also have found out that one can use eSCL also on USB multi-function
devices through the IPP-over-USB daemon ippusbxd
(https://github.com/OpenPrinting/ippusbxd). eSCL is not actually IPP but
ippusbxd is more an HTTP-over-USB or perhaps even IP-over-USB daemon than
strictly IPP. ippusbxd does not advertise the scan function via DNS-SD, here I
would need a reliable way to find out through USB whether the device has a
scanner or not. Tests and contributions in this direction are very welcome.
Scanning through ippusbxd also overcomes the following issue of ippusbxd:
https://github.com/OpenPrinting/ippusbxd/issues/9
Allow also classic USB connections while
ippusbxd is running
For example I have HP multi-function devices and they print perfectly driverless
via IPP-over-USB using ippusbxd, but I cannot actually use ippusbxd as then I
cannot scan, as the HPLIP SANE backend cannot access the device via conventional
USB due to the fact that ippusbxd completely occupies the USB. An eSCL backend
which also accesses throu ippusbxd would come in handy here.
Till
