Subject: Re: [Bluez-users] Re: 2 Successive OBEX Connect Request
From: Marcel Holtmann <marcel@holtmann.org>
To: bluez-users@lists.sourceforge.net
In-Reply-To: <20051202023157.95773.qmail@web32409.mail.mud.yahoo.com>
References: <20051202023157.95773.qmail@web32409.mail.mud.yahoo.com>
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Date: Fri, 02 Dec 2005 09:17:44 +0100

Hi Arch,

> Here is the trace provided by hcidump.
>  
> > HCI Event: Connect Request (0x04) plen 10
>     bdaddr 00:15:B9:24:F2:4F class 0x7a0204 type ACL
> < HCI Command: Accept Connection Request (0x01|0x0009) plen 7
>     bdaddr 00:15:B9:24:F2:4F role 0x01
>     Role: Slave
> > HCI Event: Command Status (0x0f) plen 4
>     Accept Connection Request (0x01|0x0009) status 0x00 ncmd 1
> > HCI Event: Connect Complete (0x03) plen 11
>     status 0x00 handle 41 bdaddr 00:15:B9:24:F2:4F type ACL encrypt
> 0x00
> < HCI Command: Change Connection Packet Type (0x01|0x000f) plen 4
>     handle 41 ptype 0xcc18
>     Packet type: DM1 DM3 DM5 DH1 DH3 DH5
> > HCI Event: Page Scan Repetition Mode Change (0x20) plen 7
>     bdaddr 00:15:B9:24:F2:4F mode 1
> > HCI Event: Max Slots Change (0x1b) plen 3
>     handle 41 slots 5
> > HCI Event: Command Status (0x0f) plen 4
>     Change Connection Packet Type (0x01|0x000f) status 0x00 ncmd 1
> > HCI Event: Connection Packet Type Changed (0x1d) plen 5
>     status 0x00 handle 41 ptype 0xcc18
>     Packet type: DM1 DM3 DM5 DH1 DH3 DH5
> > ACL data: handle 41 flags 0x02 dlen 12
>     L2CAP(s): Connect req: psm 3 scid 0x0042
> < ACL data: handle 41 flags 0x02 dlen 16
>     L2CAP(s): Connect rsp: dcid 0x0040 scid 0x0042 result 0 status 0
>       Connection successful
> > HCI Event: Number of Completed Packets (0x13) plen 5
>     handle 41 packets 1
> > ACL data: handle 41 flags 0x02 dlen 16
>     L2CAP(s): Config req: dcid 0x0040 flags 0x00 clen 4
>       MTU 1598
> < ACL data: handle 41 flags 0x02 dlen 14
>     L2CAP(s): Config rsp: scid 0x0042 flags 0x00 result 0 clen 0
>       Success
> < ACL data: handle 41 flags 0x02 dlen 16
>     L2CAP(s): Config req: dcid 0x0042 flags 0x00 clen 4
>       MTU 1024
> > HCI Event: Number of Completed Packets (0x13) plen 5
>     handle 41 packets 1
> > HCI Event: Number of Completed Packets (0x13) plen 5
>     handle 41 packets 1
> > ACL data: handle 41 flags 0x02 dlen 14
>     L2CAP(s): Config rsp: scid 0x0040 flags 0x00 result 0 clen 0
>       Success
> > ACL data: handle 41 flags 0x02 dlen 8
>     L2CAP(d): cid 0x0040 len 4 [psm 3]
>       RFCOMM(s): SABM: cr 1 dlci 0 pf 1 ilen 0 fcs 0x1c
> < ACL data: handle 41 flags 0x02 dlen 8
>     L2CAP(d): cid 0x0042 len 4 [psm 3]
>       RFCOMM(s): UA: cr 1 dlci 0 pf 1 ilen 0 fcs 0xd7
> > HCI Event: Number of Completed Packets (0x13) plen 5
>     handle 41 packets 1
> > ACL data: handle 41 flags 0x02 dlen 18
>     L2CAP(d): cid 0x0040 len 14 [psm 3]
>       RFCOMM(s): PN CMD: cr 1 dlci 0 pf 0 ilen 10 fcs 0x70 mcc_len 8
>       dlci 10 frame_type 0 credit_flow 15 pri 0 ack_timer 0
>       frame_size 1592 max_retrans 0 credits 3
> < ACL data: handle 41 flags 0x02 dlen 18
>     L2CAP(d): cid 0x0042 len 14 [psm 3]
>       RFCOMM(s): PN RSP: cr 0 dlci 0 pf 0 ilen 10 fcs 0xaa mcc_len 8
>       dlci 10 frame_type 0 credit_flow 14 pri 0 ack_timer 0
>       frame_size 1592 max_retrans 0 credits 7
> > HCI Event: Number of Completed Packets (0x13) plen 5
>     handle 41 packets 1
> > ACL data: handle 41 flags 0x02 dlen 8
>     L2CAP(d): cid 0x0040 len 4 [psm 3]
>       RFCOMM(s): SABM: cr 1 dlci 10 pf 1 ilen 0 fcs 0x8c
> < ACL data: ha ndle 41 flags 0x02 dlen 8
>     L2CAP(d): cid 0x0042 len 4 [psm 3]
>       RFCOMM(s): UA: cr 1 dlci 10 pf 1 ilen 0 fcs 0x47
> < ACL data: handle 41 flags 0x02 dlen 12
>     L2CAP(d): cid 0x0042 len 8 [psm 3]
>       RFCOMM(s): M SC CMD: cr 0 dlci 0 pf 0 ilen 4 fcs 0xaa mcc_len 2
>       dlci 10 fc 0 rtc 1 rtr 1 ic 0 dv 1 b1 1 b2 1 b3 0 len 0
> > HCI Event: Number of Completed Packets (0x13) plen 5
>     handle 41 packets 1
> > HCI Event: Number of Completed Packets (0x13) plen 5
>     handle 41 packets 1<
>  /div> 
> > ACL data: handle 41 flags 0x02 dlen 12
>     L2CAP(d): cid 0x0040 len 8 [psm 3]
>       RFCOMM(s): MSC CMD: cr 1 dlci 0 pf 0 ilen 4 fcs 0x70 mcc_len 2
>       dlci 10 fc 0 rtc 1 rtr 1 ic 0 dv 1 b1 1 b2 1 b3 0 len 0
> < ACL data: handle 41 flags 0x02 dlen 12
>     L2CAP(d): cid 0x0042 len 8 [psm 3]
>       RFCOMM(s): MSC RSP: cr 0 dlci 0 pf 0 ilen 4 fcs 0xaa mcc_len 2
>       dlci 10 fc 0 rtc 1 rtr 1 ic 0 dv 1 b1 1 b2 1 b3 0 len 0
> > ACL data: handle 41 flags 0x02 dlen 12
>     L2CAP(d): cid 0x0040 len 8 [ps m 3]
>       RFCOMM(s): MSC RSP: cr 1 dlci 0 pf 0 ilen 4 fcs 0x70 mcc_len 2
>       dlci 10 fc 0 rtc 1 rtr 1 ic 0 dv 1 b1 1 b2 1 b3 0 len 0
> < ACL data: handle 41 flags 0x02 dlen 9
>     L2CAP(d): cid 0x0042 len 5 [psm 3]
>       RFCOMM(d): UIH: cr 0 dlci 10 pf 1 ilen 0 fcs 0x76 credits 33
> > HCI Event: Number of Completed Packets (0x13) plen 5
>     handle 41 packets 1
> > HCI Event: Number of Completed Packets (0x13) plen 5
>     handle 41 packets 1
> > ACL data: handle 41 flags 0x02 dlen 34
>     L2CAP(d): cid 0x0040 len 30 [psm 3]
>       RFCOMM(d): UIH: cr 1 dlci 10 pf 0 ilen 26 fcs 0xb0
>         OBEX: Connect cmd(f): len 26 version 1.0 flags 0 mtu 7980
>         Target (0x46) = Sequence length 16
>         0000: 00 00 11 18 00 00 10 00  80 00 00 80 5f 9b 34
> fb  ............_.4.
> < ACL data: handle 41 flags 0x02 dlen 39
>     L2CAP(d): cid 0x0042 len 35 [psm 3]
>       RFCOMM(d): UIH: cr 0 dlci 10 pf 0 ilen 31 fcs 0x6a
>         OBEX: Connect rsp(f): status 200 len 31 version 1.1 flags 0
> mtu 1024
>         Status 200 = Success
>         Who (0x4a) = Sequence length 16
>         0000: 00 00 11 18 00 00 10 00  80 00 00 80 5f 9b 34
> fb  ............_.4.
>         Connection ID (0xcb) = 0
> > HCI Event: Number of Completed Packets (0x13) plen 5
>     handle 41 packets 1
> > ACL data: handle 41 flags 0x02 dlen 12
>     L2CAP(s): Connect req: psm 1 scid 0x0043
> < ACL data: handle 41 flags 0x02 dle n 16
>     L2CAP(s): Connect rsp: dcid 0x0041 scid 0x0043 result 0 status 0
>       Connection successful
> > HCI Event: Number of Completed Packets (0x13) plen 5
>     handle 41 packets 1
> > ACL data: handle 41 flags 0x02 dlen 20
>     L2CAP(s): Config req: dcid 0x0041 flags 0x00 clen 8
>       MTU 256 FlushTO 65535
> < ACL data: handle 41 flags 0x02 dlen 14
>     L2CAP(s): Config rsp: scid 0x0043 flags 0x00 result 0 clen 0
>       Success
> < ACL data: handle 41 flags 0x02 dlen 12
>     L2CAP(s): Config req: dcid 0x0043 flags 0x00 clen 0
> > HCI Event: Number of Completed Packets (0x13) plen 5
>     handle 41 packets 1
> > HCI Event: Number of Completed Packets (0x13) plen 5
>     handle 41 packe ts 1
> > ACL data: handle 41 flags 0x02 dlen 14
>     L2CAP(s): Config rsp: scid 0x0041 flags 0x00 result 0 clen 0
>       Success
> > ACL data: handle 41 flags 0x02 dlen 34
>     L2CAP(d): cid 0x0041 len 30 [psm 1]
>         SDP SSA Req: tid 0x0 len 0x19
>           pat uuid-16 0x1123
>           max 240
>           aid(s) 0x0001 (SrvClassIDList) 0x0003 (SrvID) 0x0004
> (ProtocolDescList) 0x000d (IconURL) 0x0100 (SrvName)
>           cont 00
> < ACL data: handle 41 flags 0x02 dlen 93
>     L2CAP(d): cid 0x0043 len 89 [psm 1]
>         SDP SSA Rsp: tid 0x0 len 0x54
>           count 81
>           record #0
>               aid 0x0001 (SrvClassIDList)
>                  < uuid-16 0x1119 uuid-16 0x1123 uuid-16 0x1118 >
>               aid 0x0004 (ProtocolDescList)
>                  < < uuid-16 0x0100 (L2CAP) > <
>                  uuid-16 0x0003 (RFCOMM) uint 0x5 > <
>                  uuid-16 0x0008 (OBEX) > >
>               aid 0x000d (IconURL)
>                  < < uuid-16 0x0100 (L2CAP) > < uuid-16 0x0003
> (RFCOMM) uint 0x6 > < uuid-16 0x0008 (OBEX) > >
>               aid 0x0100 (SrvName)
>                  str "Basic Printing"
>           cont 00
> > HCI Event: Number of Completed Packets (0x13) plen 5
>     handle 41 packets 1
> > ACL data: handle 41 flags 0x02 dlen 12
>    ;  L2CAP(s): Disconn req: dcid 0x0041 scid 0x0043
> < ACL data: handle 41 flags 0x02 dlen 12
>     L2CAP(s): Disconn rsp: dcid 0x0041 scid 0x0043
> > HCI Event: Number of Completed Packets (0x13) plen 5
>     handle 41 packets 1
> > HCI Event: Max Slots Change (0x1b) plen 3
>     handle 41 slots 1
> > HCI Event: Max Slots Change (0x1b) plen 3
>     handle 41 slots 5
>  
>  
> Supposedly, after the L2CAP disconnection, the Bluetooth device
> (mobile phone) will issue another OBEX Connect Request. However, as
> you may see in this trace, the 2nd OBEX Connect Request was not
> issued. I hope to know more about what happened to the connection and
> why doesn't the transaction proceed.

the first L2CAP is to PSM 3 to establish the RFCOMM connection and then
it establishes the OBEX connection on channel 5. The second L2CAP is to
PSM 1 for an SDP service request. There are no multiple OBEX connection
requests.

Regards

Marcel


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