Odd Problem with advertising two scanners on same IP

[markosjal]

This is not related to SANE-AirScan really other than it is eSCL related. I thought this might be a good place where someone may have some ideas.

I have set up an eSCL scan server of sorts and I have it advertising two scanners on the network as eSCL scanners. I am getting some odd behavior . Most notably is an annoyance show in Mopria Scan.

As I have 2 scanners using the same IP, but different ports I get an odd display in Mopria Scan. Also it seems to stop my native eSCL Scanner from showing up which is an HP M-283fdw

Of course this may be a bug in Mopria Scan but also noteworthy is how the Names get jumbled up. The second scanner in the list seems to take on the name of the first in a second line for name.

The HP does display two lines for names on Mopria but I was never able to replicate it.

All scanners use unique UUIDS , with a scanner using the same UUID in ScannerCapabilities as the Avahi/Bonjour announcement, but I am guessing at how to format them

`$ avahi-browse -d local _uscan._tcp --resolve -t

•   eno1 IPv6 Ion AirCopyMac                                _uscan._tcp          local
•   eno1 IPv4 Samsung M2885@eSCL                            _uscan._tcp          local
•   eno1 IPv4 Ion AirCopyWin                                _uscan._tcp          local
•   eno1 IPv4 Ion AirCopyMac                                _uscan._tcp          local
•   eno1 IPv4 HP-M283fdw                                    _uscan._tcp          local
  =   eno1 IPv6 Ion AirCopyMac                                _uscan._tcp          local
     hostname = [Marks-Mac-mini.local]
     address = [192.168.0.117]
     port = [80]
     txt = ["txtvers=1" "adminurl=http://192.168.0.117:80/editconfig.php" "ty=Ion AirCopyMac" "mfg=Ion" "mdl=AirCopyMac" "usb_MFG=Ion" "usb_MDL=Ion AirCopyMac" "vers=2.2" "representation=http://192.168.0.117:80/icon.png" "rs=eSCL" "uuid=4509a320-00a0-008e-00b6-000507510ecc" "pdl=image/jpeg" "cs=color" "is=adf" "duplex=F" "note=AirScan@MacOS"]
  =   eno1 IPv4 Samsung M2885@eSCL                            _uscan._tcp          local
     hostname = [DESKTOP-PGPRSSR.local]
     address = [192.168.0.40]
     port = [8000]
     txt = ["txtvers=1" "adminurl=http://192.168.0.40:8000/index.php" "ty=Samsung M2885@eSCL" "mfg=Samsung" "mdl=M2885" "usb_MFG=Samsung" "usb_MDL=Samsung M2885@eSCL" "vers=2.2" "representation=http://192.168.0.40:8000/scannericons/Samsung-M2885FW.png" "rs=eSCL" "uuid=3508b420-00a0-004e-00b5-002507510cab" "pdl=application/pdf,image/jpeg" "cs=color,grayscale,binary" "is=platen,adf" "duplex=F" "note=Twain2AirScan Version 2.07"]
  =   eno1 IPv4 Ion AirCopyWin                                _uscan._tcp          local
     hostname = [DESKTOP-PGPRSSR.local]
     address = [192.168.0.40]
     port = [8090]
     txt = ["txtvers=1" "adminurl=http://192.168.0.40:8090/index.php" "ty=Ion AirCopyWin" "mfg=Ion" "mdl=AirCopyWin" "usb_MFG=Ion" "usb_MDL=AirCopyWin" "vers=2.2" "representation=http://192.168.0.40:8090/icon.png" "rs=eSCL" "uuid=4509a320-00a0-008e-00b6-000507510e99" "pdl=image/jpeg" "cs=color" "is=adf" "duplex=F" "note=AirScan@Windows"]
  =   eno1 IPv4 Ion AirCopyMac                                _uscan._tcp          local
     hostname = [Marks-Mac-mini.local]
     address = [192.168.0.117]
     port = [80]
     txt = ["txtvers=1" "adminurl=http://192.168.0.117:80/editconfig.php" "ty=Ion AirCopyMac" "mfg=Ion" "mdl=AirCopyMac" "usb_MFG=Ion" "usb_MDL=Ion AirCopyMac" "vers=2.2" "representation=http://192.168.0.117:80/icon.png" "rs=eSCL" "uuid=4509a320-00a0-008e-00b6-000507510ecc" "pdl=image/jpeg" "cs=color" "is=adf" "duplex=F" "note=AirScan@MacOS"]
  =   eno1 IPv4 HP-M283fdw                                    _uscan._tcp          local
     hostname = [HP-M283FDW.local]
     address = [192.168.0.250]
     port = [8080]
     txt = ["mopria-certified-scan=1.3" "note=" "duplex=F" "is=platen,adf" "cs=color,grayscale" "pdl=application/pdf,image/jpeg" "uuid=564e4252-4e42-4330-4630-842afd7a4d20" "rs=eSCL" "representation=http://hp-m283fdw.local./ipp/images/printer.png" "vers=2.63" "usb_MDL=HP ColorLaserJet MFP M282-M285" "usb_MFG=HP" "mdl=ColorLaserJet MFP M282-M285" "mfg=HP" "ty=HP ColorLaserJet MFP M282-M285" "adminurl=http://hp-m283fdw.local/." "txtvers=1"]`

[markosjal]

I reported this same bug to Mopria and linked to this page.

I actually got the following reply from Mopria

"
Hi Mark,

Thank you for your continued patience and detailed feedback.
Please see the following response:

We have not defined any specifications for the scan server yet, so we did not expect the case you pointed out.
However, we have investigated the case you reported and found a potential problem. So, we will fix this issue in the next version.
As you mentioned, multiple scan services using the same IP address should be identified by UUID.

Many thanks,
Mopria Alliance Support Team
"

Amazing they even responded!

One small step for man...