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That fixed it! Here were the steps:

(1) def extractIPs(fileContent):
    pattern = r"((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)([ (\[]?(\.|dot)[ )\]]?(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3})"
    ips = [each[0] for each in re.findall(pattern, fileContent)]   
    for item in ips:
        location = ips.index(item)
        ip = re.sub("[ ()\[\]]", "", item)
        ip = re.sub("dot", ".", ip)
        ips.remove(item)
        ips.insert(location, ip)
    return ips
#SCANNER_IP=SCANNER_SANE_NAME.split(' ')[-1]
try:
  SCANNER_IP = extractIPs(SCANNER_SANE_NAME)[0]
except IndexError: # regex failed?
  sys.exit(1)

(2) change the conf file like you said

Would it not make more sense to define SIZE2SANE in the python script rather than in the conf - depending on the sane scanner id, it could be set dynamically?

This is the output of scanimage --help -d 'smfp:net;192.168.178.25'

Options specific to device `smfp:net;192.168.178.25':
    --preview[=(yes|no)] [no]
        Request a preview-quality scan
  Image Quality:
    --mode Color - 16 Million Colors|Grayscale - 256 Levels|Black and White - Halftone|Black and White - Line Art [Color - 16 Million Colors]
        Set the color composition mode of the scanned image
    --resolution 75|100|150|200|300|600|1200dpi [300]
        Set the resolution of the scanned image
  Scan Area:
    --doc-source Flatbed|ADF Simplex [Flatbed]
        Select source of the document to be scanned
    --page-format Statement|Statement (Rotated)|A5|A5 (Rotated)|B5 (JIS)|Executive|A4|Letter|Custom [A4]
        Set the paper format of the scanned page
    -l 0..216mm

• 
          Set left position of the scan area
      -t 0..297mm
• 
          Set top position of the scan area
      -x 0..216mm [210]
          Width of scan-area.
      -y 0..297mm [297]
          Height of scan-area.
  
  Trying the scan in python now (was there a reason you recommended ipython?)

The package is now working (ish) with some manual fixes:
in force_multipart() I force host = '192.168.178.25' (the ip of the scanner)
in queryPrinterScanStatus() I force SCANNER_IP to '192.168.178.25

The reason for  the first one is that the script dies and complains about a non-numeric host (it accepts the ip address). scanimage -L returns something like snmp:net;192.168.178.25 and this chokes the h = http_client.HTTPConnection(host) - which expects an ip, not a string (I think).

The  reason for the second one is the same as the first except that it is now SCANNER_IP which gets the string returned from scanimage -L - that should also be an ip.

Once I manually force those two variables to ip addresses, I get to choose the options on the scanner itself. Those options are apparently successfully transported (and are displayed by the script). However, once initScan() is called, everything goes pear shaped. I get:

INFO:stderr:    imgs, s = initScan()
INFO:stderr:  File "samsungScannerServer.py", line 451, in initScan
INFO:stderr:    s.page_format = size #t-k: bugfix page_format is correct (not page-format)
INFO:stderr:  File "/usr/lib64/python2.7/site-packages/sane.py", line 183, in __setattr__
INFO:stderr:    self.last_opt = dev.set_option(opt.index, value)
INFO:stderr:_sane.error: Invalid argument

When I run scanimage -d 'smfp:net;192.168.178.25' > out.image, it works and I get an image in out.image - thus I don't think that this is related to the samsung uld backend but rather to how the script is calling the sane scanimage function. Here is the system information for sane:

sane-backends-autoconfig-1.0.23-5.1.1.x86_64
sane-backends-1.0.23-5.1.1.x86_64
python-imaging-sane-1.1.7-34.1.x86_64

I'm using the ULD version contained in ULD_Linux_V1.00.06.tar.gz

Any ideas?

Hi. I built a package for openSUSE (have'nt had a chance to test it yet until I get home). It is available here:
https://build.opensuse.org/package/show?project=home%3Ababelworx&package=python-samsungScannerServer

I still have to do some work with systemd.

What license is this software distributed under? Would it be possible to put a license file in the package?