Re: hci0 is invisible

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Stefan Seyfried wrote:
Hi Gene,

On Wed, 16 Sep 2009 12:04:13 -0400
Gene Heskett <gene.heskett@xxxxxxxxxxx> wrote:

Greetings Marcel;
Yet another failed pass at getting these &*^$ dongles from Conwise
Tech to work as a simple rs-232 link.

I have simlinked the contents of /etc/bluetooth, /usr/etc/bluetooth,
and /usr/local/etc/bluetooth so that regardless of where it might
look for config files, it will find something.

It should actually work without lots of config files.
I've put the device on the other end of the path back into the
non-paired state.  It is an eb101, according to test-discovery, is:
[root@coyote test]# ./test-discovery
[ 00:0C:84:00:86:F8 ] Name = eb101 Paired = 0 LegacyPairing = 1 Alias = eb101 Address = 00:0C:84:00:86:F8 RSSI = 0 Class = 0x001f00

Very good, it means your adapter and the other side is up and running.

[root@coyote tools]# hcitool  inq
Inquiring ...
        00:0C:84:00:86:F8       clock offset: 0x5711    class:
0x001f00 [root@coyote tools]# hcitool  cc 00:0C:84:00:86:F8
This last command can be repeated, with no errors reported.  And no
device can be created either in /dev, or in the link the messages
file reports when the dongle is plugged in:

This is a misunderstanding on your side. There is no such thing as a
device in /dev for the bluetooth adapter. Think of it like an ethernet
interface - you also don't have /dev/eth0 and still it works.

Sep 16 11:39:04 coyote kernel: [564988.826049] usb 2-5.1: new full
speed USB device using ohci_hcd and address 9
Sep 16 11:39:05 coyote kernel: [564988.919053] usb 2-5.1: New USB
device found, idVendor=0e5e, idProduct=6622
Sep 16 11:39:05 coyote kernel: [564988.919057] usb 2-5.1: New USB
device strings: Mfr=0, Product=0, SerialNumber=0
Sep 16 11:39:05 coyote kernel: [564988.919145] usb 2-5.1:
configuration #1 chosen from 1 choice
Sep 16 11:39:05 coyote bluetoothd[892]: HCI dev 0 registered
Sep 16 11:39:05 coyote bluetoothd[892]: HCI dev 0 up
Sep 16 11:39:05 coyote bluetoothd[892]: Starting security manager 0
Sep 16 11:39:05 coyote bluetoothd[892]: Parsing /usr/local/etc/bluetooth/serial.conf failed: Key file does not start
with a group
Sep 16 11:39:05 coyote bluetoothd[892]: Adapter /org/bluez/892/hci0
has been enabled
Q: What defines this missing "group" in the serial.conf file?, which
is now 100% commented.  Copied from the 4.51 serial tree verbatum
since it wasn't installed by a make install.

It is not needed, since the defaults are just fine.

Firing up bluetooth-wizard, the eb101 is displayed, and can be
selected, but the pairing attempt fails.  Pin on both ends is 0000.

What can I do to make minicom find and use this hci0 device as a
modem circuit? /dev/hci0 doesn't exist, and minicom can't find /org/bluez/892/hci0.

You need to either create a rfcomm device with "rfcomm bind <bdaddr>
<channel>" or use something like test-serial to set up the rfcomm
device for you.

This rfcomm device (usually "/dev/rfcomm0") then is the "serial port"
that you hook up screen, or minicom or pppd or whatever.

I have written something up about rfcomm in a former life on
http://en.opensuse.org/Bluetooth
(it is not suse specific at all, but it might be outdated), for your
case http://en.opensuse.org/Bluetooth/rfcomm might be even more
specific.

Nowadays, you might also get good results with "test-serial".
At least on my phone "test-serial <bdaddr>" gets me an /dev/rfcomm0
which I can use to talk to it with AT commands. Be prepared that all
those test-* commands will cancel the connection after 1000 seconds,
but increasing the timeout is easy as it is a simple python script ;)

The /org/bluez/892/hci0 is no filesystem path but a pointer to where
the device lives on the famous D-Bus ;)


oh i so wish there was some "user level" documentation for bluez!
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