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Protocol errors

Bluez-users Pedro Monjo Florit 1 participant 1 message Jun 8, 2005 Bluetooth drivers

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Pedro Monjo Florit

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Hi all:

I am running an application on a computer that has many handheld devices withing range. Obviously, these devices all have bluetooth enabled and the communication is done using bluetooth protocols. From time to time I get some strange errors. I have run hcidump and I have attached the results. These are only fragments, as the application is running continuously.

* In hcidump1.txt, there is a response to an SDP query. Everything goes well until "srv rec #5", when another SDP query is sent to (apparently) a different device. At this point, the communication aborts and the ERROR line is shown. Has anybody any idea why is this happening? Has anybody seen this before?
* In hcidump2.txt, there is a line with "ERROR: Unknown PDU ID:
0x4b". As I understand it, this means that a device has sent an illegal L2CAP message. If this is correct, then it means that the device has a broken bluetooth implementation. Another possibility would be that BlueZ does not handle all messages. Any ideas?

Thank you and regards,

Pedro

Quoted 1 line

ACL data: handle 0x0029 flags 0x01 dlen 164

    L2CAP(d): cid 0x0040 len 672 [psm 1]
        SDP SSA Rsp: tid 0x0 len 0x29b
          cnt 0x28e
          srv rec #0
            aid 0x0000 (SrvRecHndl)
               uint 0x10000
            aid 0x0001 (SrvClassIDList)
               < uuid-16 0x1111 (Fax) uuid-16 0x1204 (Telephony) >
            aid 0x0002 (SrvRecState)
               uint 0x6
            aid 0x0004 (ProtocolDescList)
               < < uuid-16 0x0100 (L2CAP) > <
               uuid-16 0x0003 (RFCOMM) uint 0x1 > >
            aid 0x0005 (BrwGrpList)
               < uuid-16 0x1002 (PubBrwsGrp) >
            aid 0x0006 (LangBaseAttrIDList)
               < uint 0x656e uint 0x6a uint 0x100 >
            aid 0x0009 (BTProfileDescList)
               < < uuid-16 0x1111 (Fax) uint 0x100 > >
            aid 0x0100 (SrvName)
               str "Fax"

          srv rec #1
            aid 0x0000 (SrvRecHndl)
               uint 0x10001
            aid 0x0001 (SrvClassIDList)
               < uuid-16 0x1103 (DUN) uuid-16 0x1201 (Networking) >
            aid 0x0002 (SrvRecState)
               uint 0x6
            aid 0x0004 (ProtocolDescList)
               < < uuid-16 0x0100 (L2CAP) > <
               uuid-16 0x0003 (RFCOMM) uint 0x1 > >
            aid 0x0005 (BrwGrpList)
               < uuid-16 0x1002 (PubBrwsGrp) >
            aid 0x0006 (LangBaseAttrIDList)
               < uint 0x656e uint 0x6a uint 0x100 >
            aid 0x0009 (BTProfileDescList)
               < < uuid-16 0x1103 (DUN) uint 0x100 > >
            aid 0x0100 (SrvName)
               str "Dial-up Networking"

          srv rec #2
            aid 0x0000 (SrvRecHndl)
               uint 0x10002
            aid 0x0001 (SrvClassIDList)
               < uuid-16 0x1101 (SP) >
            aid 0x0002 (SrvRecState)
               uint 0x9
            aid 0x0004 (ProtocolDescList)
               < < uuid-16 0x0100 (L2CAP) > <
               uuid-16 0x0003 (RFCOMM) uint 0x2 > >
            aid 0x0005 (BrwGrpList)
               < uuid-16 0x1002 (PubBrwsGrp) >
            aid 0x0006 (LangBaseAttrIDList)
               < uint 0x656e uint 0x6a uint 0x100 >
            aid 0x0007 (SrvInfoTimeToLive)
               uint 0x4b0
            aid 0x0008 (SrvAvail)
               uint 0xff
            aid 0x0100 (SrvName)
               str "Bluetooth Serial Port"
            aid 0x0101 (SrvDesc)
               str "Bluetooth Serial Port"
            aid 0x0102 (ProviderName)
               str "Symbian Ltd."

          srv rec #3
            aid 0x0000 (SrvRecHndl)
               uint 0x10003
            aid 0x0001 (SrvClassIDList)
               < uuid-16 0x1106 (OBEXObjTrnsf) >
            aid 0x0002 (SrvRecState)
               uint 0x6
            aid 0x0004 (ProtocolDescList)
               < < uuid-16 0x0100 (L2CAP) > <
               uuid-16 0x0003 (RFCOMM) uint 0xa > <
               uuid-16 0x0008 (OBEX) > >
            aid 0x0005 (BrwGrpList)
               < uuid-16 0x1002 (PubBrwsGrp) >
            aid 0x0006 (LangBaseAttrIDList)
               < uint 0x656e uint 0x6a uint 0x100 >
            aid 0x0009 (BTProfileDescList)
               < < uuid-16 0x1106 (OBEXObjTrnsf) uint 0x100 > >
            aid 0x0100 (SrvName)
               str "OBEX File Transfer"

          srv rec #4
            aid 0x0000 (SrvRecHndl)
               uint 0x10004
            aid 0x0001 (SrvClassIDList)
               < uuid-16 0x1105 (OBEXObjPush) >
            aid 0x0002 (SrvRecState)
               uint 0x7
            aid 0x0004 (ProtocolDescList)
               < < uuid-16 0x0100 (L2CAP) > <
               uuid-16 0x0003 (RFCOMM) uint 0x9 > <
               uuid-16 0x0008 (OBEX) > >
            aid 0x0005 (BrwGrpList)
               < uuid-16 0x1002 (PubBrwsGrp) >
            aid 0x0006 (LangBaseAttrIDList)
               < uint 0x656e uint 0x6a uint 0x100 >
            aid 0x0009 (BTProfileDescList)
               < < uuid-16 0x1105 (OBEXObjPush) uint 0x100 > >
            aid 0x0100 (SrvName)
               str "OBEX Object Push"
            aid 0x0303 (SuppFormatsList)
               < uint 0xff >

          srv rec #5
            aid 0x0000 (SrvRecHndl)
               uint 0x10005
            aid 0x0001 (SrvClassIDList)
               < uuid-16 0x111f uuid-16 0x1203 (Audio) >
            aid 0x0002 (SrvRecState)
               uint 0x8
            aid 0x0004 (ProtocolDescList)
               < < uuid-16 0x0100 (L2CAP) > <
               uuid-16 0x0003 (RFCOMM) uint 0x3 > >
            aid 0x0005 (BrwGrpList)
               < uuid-16 0x1002 (PubBrwsGrp) >
            aid 0x0006 (LangBaseAttrIDList)
               < uint 0x656e uint 0x6a uint 0x100 >
            aid 0x0009 (BTProfileDescList)
               < < uuid-16 0x111e uint 0x101 > >
            aid 0x0100 (SrvName)
               str "Handsfre

"

cont
< ACL data: handle 0x0029 flags 0x02 dlen 34

    L2CAP(d): cid 0x0042 len 30 [psm 1]
        SDP SSA Req: tid 0x1 len 0x19
          pat uuid-16 0x1002 (PubBrwsGrp)
          max 0xffff
          aid(s) 0x0000 - 0xffff
          cont 0A 00 00 02 8E 00 00 02 A8 00 00
Quoted 2 lines

HCI Event: Number of Completed Packets (0x13) plen 5 ACL data: handle 0x0029 flags 0x02 dlen 38

    L2CAP(d): cid 0x0040 len 34 [psm 1]
        SDP SSA Rsp: tid 0x1 len 0x1d
          cnt 0x1a

ERROR: Unexpected syntax

          cont 41 75 64 69 6F 20 47 61 74 65 77 61 79 09 03 01 08 01 09 03 11 09 00 0F 00

< HCI Command: Create Connection (0x01|0x0005) plen 13
9B CF 82 3E 04 00 18 CC 02 00 00 00 01

Quoted 1 line

HCI Event: Command Status (0x0f) plen 4

00 01 05 04
< ACL data: handle 0x002f flags 0x02 dlen 8

    L2CAP(d): cid 0x0068 len 4 [psm 0]
      4B 53 01 D3
< ACL data: handle 0x002f flags 0x02 dlen 8
    L2CAP(d): cid 0x0068 len 4 [psm 0]
      03 53 01 FD
< ACL data: handle 0x002f flags 0x02 dlen 12
    L2CAP(s): Disconn req: dcid 0x0068 scid 0x0040
Quoted 1 line

HCI Event: Number of Completed Packets (0x13) plen 5

01 2F 00 01 00

Quoted 1 line

HCI Event: Number of Completed Packets (0x13) plen 5

01 2F 00 01 00

Quoted 1 line

HCI Event: Number of Completed Packets (0x13) plen 5

01 2F 00 01 00

Quoted 1 line

HCI Event: Mode Change (0x14) plen 6

00 2F 00 00 00 00

Quoted 1 line

HCI Event: Connect Complete (0x03) plen 11

00 29 00 9B CF 82 3E 04 00 01 00
< ACL data: handle 0x0029 flags 0x02 dlen 12

    L2CAP(s): Connect req: psm 1 scid 0x0040

< HCI Command: Write Link Policy Settings (0x02|0x000d) plen 4
29 00 0F 00

Quoted 1 line

HCI Event: Number of Completed Packets (0x13) plen 5

01 29 00 01 00

Quoted 1 line

HCI Event: Command Complete (0x0e) plen 6

01 0D 08 00 29 00

Quoted 1 line

HCI Event: Max Slots Change (0x1b) plen 3

29 00 05

Quoted 1 line

ACL data: handle 0x0029 flags 0x02 dlen 16

    L2CAP(s): Connect rsp: dcid 0x0040 scid 0x0040 result 0 status 0
< ACL data: handle 0x0029 flags 0x02 dlen 12
    L2CAP(s): Config req: dcid 0x0040 flags 0x0000 clen 0
Quoted 1 line

ACL data: handle 0x002f flags 0x02 dlen 8

    L2CAP(d): cid 0x0040 len 4 [psm 1]
        ERROR: Unknown PDU ID: 0x4b
Quoted 1 line

HCI Event: Number of Completed Packets (0x13) plen 5

01 29 00 01 00

Quoted 1 line

ACL data: handle 0x0029 flags 0x02 dlen 20

    L2CAP(s): Config req: dcid 0x0040 flags 0x0000 clen 8
    MTU 512 FlushTO 65535
< ACL data: handle 0x0029 flags 0x02 dlen 14
    L2CAP(s): Config rsp: scid 0x0040 flags 0x0000 result 0 clen 0
Quoted 1 line

HCI Event: Number of Completed Packets (0x13) plen 5

01 29 00 01 00

Quoted 1 line

ACL data: handle 0x0029 flags 0x02 dlen 14

    L2CAP(s): Config rsp: scid 0x0040 flags 0x0000 result 0 clen 0
< ACL data: handle 0x0029 flags 0x02 dlen 24
    L2CAP(d): cid 0x0040 len 20 [psm 1]
        SDP SSA Req: tid 0x0 len 0xf
          pat uuid-16 0x1002 (PubBrwsGrp)
          max 0xffff
          aid(s) 0x0000 - 0xffff
          cont 00
Quoted 1 line

HCI Event: Number of Completed Packets (0x13) plen 5

01 29 00 01 00