[Bug 897255] [NEW] RFCOMM channel 1 and automatic channel choosing broken cause of DUN

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I want to set up a bluetooth RFCOMM connection between two devices with
some script. I use python bluez bindings for that.

I discovered that setting up a server, using the first free channel, won't throw an error but doesn't give me a reliable connection either using some code like provided by http://people.csail.mit.edu/albert/bluez-intro/x232.html with port = bluetooth.PORT_ANY
The first free port discovered is port 1.

After "playing" around (getting frustrated investigating possible other
mistakes or sources of error), I finally set it to port = 5 (some fixed
port > 1).

It worked. Trying to set up a second server on the same port threw an
error. Like it should.

After learning about the command "sdptool browse local" i saw, that some
DUN service occupied RFCOMM channel 1. But no one threw an error.

I did not found a file which set up the DUN service and I don't know a
method how to get the process which owns this DUN service or set it up.

I think it is an error cause choosing the first free RFCOMM channel
should just work and acquiring a already used channel should result in
an informative and unique error message. Also it would be nice to know
which process set up and owns some bluetooth service.

----
Ubuntu 11.10

$ apt-cache policy bluez bluez-compat bluez-tools bluez-utils python-bluez 
bluez:
  Installed: 4.96-0ubuntu4
  Candidate: 4.96-0ubuntu4
  Version table:
 *** 4.96-0ubuntu4 0
        500 http://de.archive.ubuntu.com/ubuntu/ oneiric-updates/main i386 Packages
        100 /var/lib/dpkg/status
     4.96-0ubuntu3 0
        500 http://de.archive.ubuntu.com/ubuntu/ oneiric/main i386 Packages
bluez-utils:
  Installed: 4.96-0ubuntu4
  Candidate: 4.96-0ubuntu4
  Version table:
 *** 4.96-0ubuntu4 0
        500 http://de.archive.ubuntu.com/ubuntu/ oneiric-updates/universe i386 Packages
        100 /var/lib/dpkg/status
     4.96-0ubuntu3 0
        500 http://de.archive.ubuntu.com/ubuntu/ oneiric/universe i386 Packages
python-bluez:
  Installed: 0.18-1build1
  Candidate: 0.18-1build1
  Version table:
 *** 0.18-1build1 0
        500 http://de.archive.ubuntu.com/ubuntu/ oneiric/universe i386 Packages
        100 /var/lib/dpkg/status
bluez-compat:
  Installed: (none)
  Candidate: 4.96-0ubuntu4
  Version table:
     4.96-0ubuntu4 0
        500 http://de.archive.ubuntu.com/ubuntu/ oneiric-updates/universe i386 Packages
     4.96-0ubuntu3 0
        500 http://de.archive.ubuntu.com/ubuntu/ oneiric/universe i386 Packages
bluez-tools:
  Installed: (none)
  Candidate: 0.1.38+git662e-2ubuntu1
  Version table:
     0.1.38+git662e-2ubuntu1 0
        500 http://de.archive.ubuntu.com/ubuntu/ oneiric/universe i386 Packages

** Affects: bluez (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bluetooth bluez bot-comment dun rfcomm
-- 
RFCOMM channel 1 and automatic channel choosing broken cause of DUN
https://bugs.launchpad.net/bugs/897255
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