raf/OBEXFTP and the elusive error code 64

I was trying to push some files into my Nokia this morning and failed miserably at it ...

For a while now I've been getting used to see KDE's bluedeviz fail in some curious manner, specially when I use it from other desktop environments. One google search and one manpage later, I decided to try to send the file from the command line, using

hcitool scan
...
obexftp -b <Bluetooth Addr> -p <filename>

All this seemed pretty straightforward, except for the fact that obexftp failed with the following message:

$ obexftp -b XX:XX:XX:XX:XX:XX -p file.pdf
Browsing XX:XX:XX:XX:XX:XX ...
Connecting..\done
Tried to connect for 29ms
Sending "file.pdf".../failed: file.pdf
The operation failed with return code 64
Disconnecting..-done

Now if that is not cryptic, I don't know what is. I have no idea what "error code 64" is supposed to be (although perror treats it a network error) and Google doesn't seem to be very helpful on this. For some reason I can not explain, I decided to backtrack and try to force the bluetooth channel that obexftp should use. I did a scan for services and found my phone's OBEX File Transfer service in channel 4:

$ sdptool browse
...
Service Name: OBEX File Transfer
Service RecHandle: 0x10007
Service Class ID List:
  "OBEX File Transfer" (0x1106)
Protocol Descriptor List:
  "L2CAP" (0x0100)
  "RFCOMM" (0x0003)
    Channel: 4
  "OBEX" (0x0008)
...

And changed the obexftp command to

$ obexftp -b XX:XX:XX:XX:XX:XX -B 4 -p file.pdf

and it succeeded :D. Hell if I have any idea why obexftp is sending files to the wrong channel.