[Bluez-users] multi connection with dund and rfcomm

[Bluez-users] multi connection with dund and rfcomm

[liang liping]

 I have three pc, they are ubuntu linux 5.0.4(kernel 2.6.10)
and three bluetooth usb adapters.
Then I have one pc to listen using command:
"sdptool add --channel=3D2 SP"
"dund -n --listen --channel 2 --msdun file /etc/bluetooth/hcid.conf"

Another pc to connect to the first one using
"dund --search --msdun -n"
the connection establish.

but when i let the third pc connect to the first one using
"dund --search --msdun -n"
it fails.It seams that the third one even can not scan the first one.

"hciconfig -a"
first one:
hci0: Type: USB
BD Address: 00:11:67:10:71:D2 ACL MTU: 678:8 SCO MTU: 48:10
UP RUNNING PSCAN ISCAN
RX bytes:1243 acl:36 sco:0 events:93 errors:0
TX bytes:1252 acl:36 sco:0 commands:39 errors:0
Features: 0xff 0xff 0x8d 0x78 0x08 0x18 0x00 0x00
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH HOLD SNIFF PARK
Link mode: SLAVE ACCEPT
Name: 'ubuntu-a-0'
Class: 0x000100
Service Classes: Unspecified
Device Class: Computer, Uncategorized
HCI Ver: 1.2 (0x2) HCI Rev: 0x1ae LMP Ver: 1.2 (0x2) LMP Subver: 0x1ae
Manufacturer: Integrated System Solution Corp. (57)

second one:
hci0: Type: USB
BD Address: 00:11:67:10:72:CA ACL MTU: 678:8 SCO MTU: 48:10
UP RUNNING PSCAN ISCAN
RX bytes:1573 acl:22 sco:0 events:91 errors:0
TX bytes:1070 acl:21 sco:0 commands:40 errors:0
Features: 0xff 0xff 0x8d 0x78 0x08 0x18 0x00 0x00
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH HOLD SNIFF PARK
Link mode: SLAVE ACCEPT
Name: 'ubuntu-0'
Class: 0x000100
Service Classes: Unspecified
Device Class: Computer, Uncategorized
HCI Ver: 1.2 (0x2) HCI Rev: 0x1ae LMP Ver: 1.2 (0x2) LMP Subver: 0x1ae
Manufacturer: Integrated System Solution Corp. (57)

third one:hci0: Type: USB
BD Address: 00:11:67:0D:EC:22 ACL MTU: 678:8 SCO MTU: 48:10
UP RUNNING PSCAN ISCAN
RX bytes:1595 acl:45 sco:0 events:122 errors:0
TX bytes:1765 acl:46 sco:0 commands:45 errors:0
Features: 0xff 0xff 0x8d 0x78 0x08 0x18 0x00 0x00
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH HOLD SNIFF PARK
Link mode: MASTER
Name: 'ubuntu-b-0'
Class: 0x000100
Service Classes: Unspecified
Device Class: Computer, Uncategorized
HCI Ver: 1.2 (0x2) HCI Rev: 0x1ae LMP Ver: 1.2 (0x2) LMP Subver: 0x1ae
Manufacturer: Integrated System Solution Corp. (57)

and all their hcid.conf are:

options {

autoinit yes;

security auto;
pairing multi;
pin_helper /usr/bin/bluez-pin;
}

device {
name "%h-%d";

class 0x100;

iscan enable; pscan enable;
lm accept;
lp rswitch,hold,sniff,park;
}

and /etc/ppp/options are:
first one:
noauth
defaultroute
crtscts
10.0.0.1:
ms-dns 10.0.0.1
ipcp-accept-local
ipcp-accept-remote
debug
noipdefault
asyncmap 0
persist

the other two:
noauth
crtscts
ms-dns 10.0.0.1
ipcp-accept-local
ipcp-accept-remote
debug
noipdefault
asyncmap 0

That is a server and two client.
why the third adapter can not connect to the first one?

Then I do another thing.
I have the first pc to listen using command
"rfcomm listen hci0 1"

the second pc to connect
"rfcomm connect hci0 <first BD_ADDR> 1"
the connection is done.

the third pc to connect
"rfcomm connect hci0 <first BD_ADDR> 1"
it prints an error:"Can't connect RFCOMM socket: Host is down".
Can several adapters connect to another addpters at the same time and
using the same channel?

after that i try using different channel:
first pc:
"rfcomm listen hci0 1"
"rfcomm listen hci0 2"

second pc:
"rfcomm connect hci0 <first BD_ADDR> 1"
connection is done

thrid pc:
"rfcomm connect hci0 <first BD_ADDR> 2"
the error is the same: "Host is down".

what does this mean?
How can i have several adapters connect to the same server adapter?
Thank you very much!


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Re: [Bluez-users] multi connection with dund and rfcomm

[Marcel Holtmann]

Hi,

>  I have three pc, they are ubuntu linux 5.0.4(kernel 2.6.10)
> and three bluetooth usb adapters.
> Then I have one pc to listen using command:
> "sdptool add --channel=2 SP"
> "dund -n --listen --channel 2 --msdun file /etc/bluetooth/hcid.conf"
> 
> Another pc to connect to the first one using
> "dund --search --msdun -n"
> the connection establish.

why don't you use pand and the PAN profile using BNEP. The DUN profile
has been deprecated by the Bluetooth SIG.

> but when i let the third pc connect to the first one using
> "dund --search --msdun -n"
> it fails.It seams that the third one even can not scan the first one.

Maybe it is a chip limitation when forming a scatternet situation.

Regards

Marcel




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