[Bluez-users] Problems connecting to multiple rfcomm sockets

[Bluez-users] Problems connecting to multiple rfcomm sockets

[Steve Drew]

Hi all,

I've been experiencing some problems when trying to open multiple rfcomm
ports, with pppd using the rfcomm ports.

I have three bluetooth serial ports setup in rfcomm.conf, but it appears
that I can open connections to two of them at once.=20

While the first two serial ports are connected, and the third is trying
to connect, running rfcomm gives;

rfcomm0: 00:0E:6D:1A:9A:3F channel 1 connected [tty-attached]
rfcomm1: 00:02:EE:82:D9:29 channel 2 connected [tty-attached]
rfcomm2: 00:60:57:70:CD:E1 channel 3 config [tty-attached]

Then the terminal with the third connection reports;

"Failed to open /dev/rfcomm2: Host is down"

At which point running #rfcomm gives;

rfcomm0: 00:0E:6D:1A:9A:3F channel 1 connected [tty-attached]
rfcomm1: 00:02:EE:82:D9:29 channel 2 connected [tty-attached]
rfcomm2: 00:60:57:70:CD:E1 channel 3 closed.

If I now close the connection to rfcomm1 or rfcomm0, I can connect to
rfcomm2 (so I can always have a max of 2 active connections).

However, If before I start the pppd connections to the serial ports, I
start 3 copies of l2ping (one to each of the MAC addresses listed
above), and keep these running, I can establish pppd connections on
rfcomm0+1+2 at the same time.

With this scenario, if one of the pppd sessions terminates, the l2ping
to the corresponding rfcomm device's MAC will stop giving:
 "Send failed: Connection reset by peer", and once again I can only use
two of the rfcomm ports.=20

Using bluez-utils-2.10-2 and bluez-libs-2.10-2 under a 2.4.22-1 kernel

Any idea/subjections/requests for more information greatly appreciated!

Many Thanks

Steve Drew



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Re: [Bluez-users] Problems connecting to multiple rfcomm sockets

[Marcel Holtmann]

Hi Steve,

> I've been experiencing some problems when trying to open multiple rfcomm
> ports, with pppd using the rfcomm ports.
> 
> I have three bluetooth serial ports setup in rfcomm.conf, but it appears
> that I can open connections to two of them at once. 
> 
> While the first two serial ports are connected, and the third is trying
> to connect, running rfcomm gives;
> 
> rfcomm0: 00:0E:6D:1A:9A:3F channel 1 connected [tty-attached]
> rfcomm1: 00:02:EE:82:D9:29 channel 2 connected [tty-attached]
> rfcomm2: 00:60:57:70:CD:E1 channel 3 config [tty-attached]
> 
> Then the terminal with the third connection reports;
> 
> "Failed to open /dev/rfcomm2: Host is down"
> 
> At which point running #rfcomm gives;
> 
> rfcomm0: 00:0E:6D:1A:9A:3F channel 1 connected [tty-attached]
> rfcomm1: 00:02:EE:82:D9:29 channel 2 connected [tty-attached]
> rfcomm2: 00:60:57:70:CD:E1 channel 3 closed.

what does "hcitool con" tell you at this point? Run "hcidump -x" and see
with what error code the third connection fails.

> If I now close the connection to rfcomm1 or rfcomm0, I can connect to
> rfcomm2 (so I can always have a max of 2 active connections).
> 
> However, If before I start the pppd connections to the serial ports, I
> start 3 copies of l2ping (one to each of the MAC addresses listed
> above), and keep these running, I can establish pppd connections on
> rfcomm0+1+2 at the same time.
> 
> With this scenario, if one of the pppd sessions terminates, the l2ping
> to the corresponding rfcomm device's MAC will stop giving:
>  "Send failed: Connection reset by peer", and once again I can only use
> two of the rfcomm ports. 
> 
> Using bluez-utils-2.10-2 and bluez-libs-2.10-2 under a 2.4.22-1 kernel
> 
> Any idea/subjections/requests for more information greatly appreciated!

What devices did you use (hciconfig -a) and to what devices are you
connecting?

Regards

Marcel




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RE: [Bluez-users] Problems connecting to multiple rfcomm sockets

[Steve Drew]

[-- Attachment #1: Type: text/plain, Size: 3526 bytes --]

Hi Marcel,

-----Original Message-----
From: Marcel Holtmann [mailto:marcel@holtmann.org] 
Sent: 27 October 2004 16:49
To: Steve Drew
Cc: BlueZ Mailing List
Subject: Re: [Bluez-users] Problems connecting to multiple rfcomm
sockets

Hi Steve,

> I've been experiencing some problems when trying to open multiple
rfcomm
> ports, with pppd using the rfcomm ports.
> 
> I have three bluetooth serial ports setup in rfcomm.conf, but it
appears
> that I can open connections to two of them at once. 
> 
> While the first two serial ports are connected, and the third is
trying
> to connect, running rfcomm gives;
> 
> rfcomm0: 00:0E:6D:1A:9A:3F channel 1 connected [tty-attached]
> rfcomm1: 00:02:EE:82:D9:29 channel 2 connected [tty-attached]
> rfcomm2: 00:60:57:70:CD:E1 channel 3 config [tty-attached]
> 
> Then the terminal with the third connection reports;
> 
> "Failed to open /dev/rfcomm2: Host is down"
> 
> At which point running #rfcomm gives;
> 
> rfcomm0: 00:0E:6D:1A:9A:3F channel 1 connected [tty-attached]
> rfcomm1: 00:02:EE:82:D9:29 channel 2 connected [tty-attached]
> rfcomm2: 00:60:57:70:CD:E1 channel 3 closed.

what does "hcitool con" tell you at this point? Run "hcidump -x" and see
with what error code the third connection fails.


FromSteve-->
At This point running hcitool con shows the following connections 

Connections:
        < ACL 00:02:EE:82:D9:29 handle 44 state 1 lm MASTER ENCRYPT
        < ACL 00:0E:6D:1A:9A:3F handle 41 state 1 lm MASTER ENCRYPT

Running hcidump -x gives the output attached in hcidump.txt (hcidump is
running from just before the 3rd connection is called, and until after
the error (Host is down) is reported). 

---->FromSteve

> If I now close the connection to rfcomm1 or rfcomm0, I can connect to
> rfcomm2 (so I can always have a max of 2 active connections).
> 
> However, If before I start the pppd connections to the serial ports, I
> start 3 copies of l2ping (one to each of the MAC addresses listed
> above), and keep these running, I can establish pppd connections on
> rfcomm0+1+2 at the same time.
> 
> With this scenario, if one of the pppd sessions terminates, the l2ping
> to the corresponding rfcomm device's MAC will stop giving:
>  "Send failed: Connection reset by peer", and once again I can only
use
> two of the rfcomm ports. 
> 
> Using bluez-utils-2.10-2 and bluez-libs-2.10-2 under a 2.4.22-1 kernel
> 
> Any idea/subjections/requests for more information greatly
appreciated!

What devices did you use (hciconfig -a) and to what devices are you
connecting?

Regards

Marcel

<---FromSteve

The adapter is a USB Dlink DBT-120, and running hciconfig -a gives;

hci0:   Type: USB
        BD Address: 00:0F:3D:5F:1F:C1 ACL MTU: 192:8  SCO MTU: 64:8
        UP RUNNING PSCAN ISCAN
        RX bytes:25060 acl:524 sco:0 events:591 errors:0
        TX bytes:20405 acl:518 sco:0 commands:38 errors:0
        Features: 0xff 0xff 0x0f 0x00 0x00 0x00 0x00 0x00
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
        Link policy: RSWITCH HOLD SNIFF PARK
        Link mode: SLAVE ACCEPT
        Name: 'slb2-0'
        Class: 0x120104
        Service Classes: Networking, Object Transfer
        Device Class: Computer, Desktop workstation
        HCI Ver: 1.1 (0x1) HCI Rev: 0x20d LMP Ver: 1.1 (0x1) LMP Subver:
0x20d
        Manufacturer: Cambridge Silicon Radio (10)

The three devices I am connecting to are Nokia6310's. 

Thanks

steve


[-- Attachment #2: hcidump0.txt --]
[-- Type: text/plain, Size: 2167 bytes --]

< HCI Command: Create Connection (0x01|0x0005) plen 13
  E1 CD 70 57 60 00 18 CC 01 00 00 00 01
> HCI Event: Command Status (0x0f) plen 4
  00 01 05 04
> ACL data: handle 0x002c flags 0x02 dlen 38
    L2CAP(d): cid 0x0040 len 34 [psm 0]
      09 FF 3B 01 7E FF 7D 23 C0 21 7D 29 4A 7D 20 7D 2C 7D 20 7D
      20 7D 20 7D 20 FF 7D 21 33 4A F3 43 7E 5C
< ACL data: handle 0x002c flags 0x02 dlen 38
    L2CAP(d): cid 0x0040 len 34 [psm 0]
      0B EF 3D 7E FF 7D 23 C0 21 7D 2A 4A 7D 20 7D 2C 7D 20 7D 20
      7D 20 7D 20 FF 7D 21 33 4A 7D 3D C4 7E 9A
> HCI Event: Number of Completed Packets (0x13) plen 5
  01 2C 00 01 00
> ACL data: handle 0x0029 flags 0x02 dlen 40
    L2CAP(d): cid 0x0040 len 36 [psm 0]
      09 FF 3F 01 7E FF 7D 23 C0 21 7D 29 51 7D 20 7D 2C 7D 20 7D
      20 7D 20 7D 20 7D 20 61 7D 20 7D 20 A4 C1 7E 5C
< ACL data: handle 0x0029 flags 0x02 dlen 39
    L2CAP(d): cid 0x0040 len 35 [psm 0]
      0B EF 3F 7E FF 7D 23 C0 21 7D 2A 51 7D 20 7D 2C 7D 20 7D 20
      7D 20 7D 20 7D 20 61 7D 20 7D 20 4A 46 7E 9A
> HCI Event: Number of Completed Packets (0x13) plen 5
  01 29 00 01 00
> ACL data: handle 0x002c flags 0x02 dlen 39
    L2CAP(d): cid 0x0040 len 35 [psm 0]
      09 FF 3D 01 7E FF 7D 23 C0 21 7D 29 4B 7D 20 7D 2C 7D 20 7D
      20 7D 20 7D 20 7D 21 59 30 D8 D9 7D 37 7E 5C
< ACL data: handle 0x002c flags 0x02 dlen 37
    L2CAP(d): cid 0x0040 len 33 [psm 0]
      0B EF 3B 7E FF 7D 23 C0 21 7D 2A 4B 7D 20 7D 2C 7D 20 7D 20
      7D 20 7D 20 7D 21 59 30 D8 37 90 7E 9A
> HCI Event: Number of Completed Packets (0x13) plen 5
  01 2C 00 01 00
> ACL data: handle 0x0029 flags 0x02 dlen 39
    L2CAP(d): cid 0x0040 len 35 [psm 0]
      09 FF 3D 01 7E FF 7D 23 C0 21 7D 29 52 7D 20 7D 2C 7D 20 7D
      20 7D 20 7D 20 FF 7D 23 C0 21 7D 31 B0 7E 5C
< ACL data: handle 0x0029 flags 0x02 dlen 37
    L2CAP(d): cid 0x0040 len 33 [psm 0]
      0B EF 3B 7E FF 7D 23 C0 21 7D 2A 52 7D 20 7D 2C 7D 20 7D 20
      7D 20 7D 20 FF 7D 23 C0 21 FF 37 7E 9A
> HCI Event: Number of Completed Packets (0x13) plen 5
  01 29 00 01 00
> HCI Event: Connect Complete (0x03) plen 11
  04 00 00 E1 CD 70 57 60 00 01 00

RE: [Bluez-users] Problems connecting to multiple rfcomm sockets

[Marcel Holtmann]

Hi Steve,

> At This point running hcitool con shows the following connections 
> 
> Connections:
>         < ACL 00:02:EE:82:D9:29 handle 44 state 1 lm MASTER ENCRYPT
>         < ACL 00:0E:6D:1A:9A:3F handle 41 state 1 lm MASTER ENCRYPT
> 
> Running hcidump -x gives the output attached in hcidump.txt (hcidump is
> running from just before the 3rd connection is called, and until after
> the error (Host is down) is reported). 

the error is a page timeout and you can try to put your other devices
into hold mode before trying to connect the third. Another option is to
increase the page timeout or simple update the firmware to a HCI 18.x
version.

Regards

Marcel




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RE: [Bluez-users] Problems connecting to multiple rfcomm sockets

[Marcel Holtmann]

Hi Steve,

> 	I've tried increasing the page timeout and the error still
> remains. 

two more options left to try.

> 	I have found that the problem is due to the mobile handsets we
> were      using (3x Nokia 6310i). Using a different handsets (Nokia
> 6230's) we were able to get bluetooth connections to 3 6230s (on top of
> this we could also have 2 6310s connected).

Yeah, the old Nokia Bluetooth chips are not quite the best for such
scenarios. The 6230 contains a CSR chip, right?

Regards

Marcel




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Re: [Bluez-users] Problems connecting to multiple rfcomm sockets

[Peter Stephenson]

Marcel Holtmann wrote:
> The 6230 contains a CSR chip, right?

Oh, yes.

pws


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