[sane-devel] Canon laser multi-functional support: MFNP protocol

[Michael Shigorin]

On Wed, Apr 01, 2015 at 06:19:05PM +0200, Louis Lagendijk wrote:
> But again: please get the devices to work over USB first before
> you attempt the network.

On Thu, Jul 02, 2015 at 07:54:51PM +0300, I wrote:
> MF8540Cdn: scanimage OK, xsane OK (75/150/300/600, colour/bw)
>   (at least "Good" by me)

So I've tried networked scanning; the device configured via DHCP
popped up in both scanimage -L and xsane's startup list but the
actual attempt to scan resulted in a second-long pause and error:

scanimage: open of device pixma:MF8500C_c219 failed: Operation was cancelled

Here's the strace snippet:

socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP) = 6
connect(6, {sa_family=AF_INET, sin_port=htons(8610), sin_addr=inet_addr("10.1.1.219")}, 16) = 0
send(6, "MFNP\2\1\0\0\0\0\0\0\0\0\0\0", 16, 0) = 16
select(7, [6], NULL, NULL, {4, 0})      = 1 (in [6], left {3, 999871})
recv(6, "MFNP\202\1\0\0\0\0\0\0\0\0\0\20\0\1\200\0\6\4,\236\374RY\n\n\1\1\333", 2048, 0) = 32
close(6)                                = 0
write(2, "scanimage: open of device pixma:"..., 77scanimage: open of device pixma:MF8500C_c219 failed: Operation was cancelled
) = 77

What do I do to help debug this?

TIA :)

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