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Free Open Source:

Swiss File Knife

a command line
multi function tool.

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Print incoming UDP messages as hex dump or plain text

on the command line with the free Swiss File Knife for Windows, Mac OS X and Linux.
- download the free Swiss File Knife Base from Sourceforge.
- open the Windows CMD command line, Mac OS X Terminal or Linux shell.
- OS X : type mv sfk-mac-64.exe sfk and chmod +x sfk then ./sfk
- Linux: type mv sfk-linux-64.exe sfk    and chmod +x sfk then ./sfk
  OS X and Linux syntax may differ, check the help within the tool.
SFK The Book - New Productivity Heights.
sfk udpdump [options] [group] port

create human-readable hexdump of UDP socket input,
for debugging of UDP network applications.

   -showle  highlights line ending characters CR and LF.
            you may also add "le" to the command name.
   -wide    dumps 32 input bytes per line.
   -lean    dumps 16 input bytes per line.
   -post    reduced format e.g. for forum posts
   -min     minimal format with alnum only text
   -echo    echo received packets back to sender.
   -stop    or stop=n stops after n received packages.
            with command chaining, default is -stop=1.
   -sep[arator] prints detailed separator between packages
            with message number, source IP and time.
   -broad   listen for broadcast on given port.
   -pure    lists flat hex characters:
   -hexsrc  lists hex comma separated values:
   -decsrc  lists decimal comma separated values:
   -maxdump=n   dump only first n bytes of incoming data.
   -flat        no hexdump, print characters as they come.
   -nohead      does not show the "received n bytes" message.
   -text        just print text, same as -flat -nohead.
                use -sep to show a header per message.
   -tofile x    write output to file x.

message filtering
   show only messages ...
   -from "s1,s2"  from IPs containing text s1 or s2.
                  note that packages from the same
                  machine may use an IP
   -from "s1 s2"  same as -from "s1,s2"
   -notfrom "s"   not from IP containing text s,
                  with ".10"  matching .10 and .100
                  but  ".10/" matching only .10
   -size n        with this size
   -minsize n     larger  or equal to n
   -maxsize n     smaller or equal to n
   -data foo      containing text "foo"
   -data 0xa0a1   containing binary data 0xa0a1

experimental multicast receive
  if a multicast group IP address is given, like
     sfk udpdump 5000
  then udpdump tries to print incoming multicast messages.
  this may or may not work depending on the OS, network
  interface, router and firewall settings, user rights and
  other programs running in parallel.

special protocol support
  sfk udpdump -bon   - print bonjour messages
  sfk udpdump -knx   - print knx messages (sfk help knx)

see also
  sfk udpsend  - send UDP packets.
  sfk hexdump  - for further format options.

  sfk udpdump 5000
     waits on port 5000 for incoming udp packages.
  sfk udpdump 5000 -from .10
     show only packages from ip's containing .10
     like or
  sfk udpdump 5000 -from ".100/,.101/,.102/"
     show only from ip's ending .100, .101 or .102
     e.g. but not

sfk is a free open-source tool, running instantly without installation efforts. no DLL's,
no registry changes - just get sfk.exe from the zip package and use it (binaries for
windows, linux and mac are included).

read more about all sfk functions here.

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