Hi,
Is this more than one connection, can you show the entire dump? (the first
one is a rsp from the other side, then it sends a req later..?)
I have only one connection: the dump gives the output of the command
btpand -a panserver -d me -s NAP -i tap1. Full dump:
HCIDump - HCI packet analyzer ver 1.5
< HCI Command: Create Connection(0x01|0x0005) plen 13
> HCI Event: Command Status(0x0f) plen 4
> HCI Event: Role Change(0x12) plen 8
> HCI Event: Connect Complete(0x03) plen 11
< HCI Command: Write Link Policy Settings(0x02|0x000d) plen 4
< ACL data: handle 0x002a flags 0x02 dlen 12
L2CAP(s): Connect req: psm 1 scid 0x004f
> HCI Event: Max Slots Change(0x1b) plen 3
> HCI Event: Number of Completed Packets(0x13) plen 5
> HCI Event: Command Complete(0x0e) plen 6
> ACL data: handle 0x002a flags 0x02 dlen 10
L2CAP(s): Info req: dlen 2
< ACL data: handle 0x002a flags 0x02 dlen 12
L2CAP(s): Info rsp: dlen 4
> HCI Event: Number of Completed Packets(0x13) plen 5
> ACL data: handle 0x002a flags 0x02 dlen 16
L2CAP(s): Connect rsp: dcid 0x0103 scid 0x004f result 0 status 0
< ACL data: handle 0x002a flags 0x02 dlen 12
L2CAP(s): Config req: dcid 0x0103 flags 0x0000 clen 0
> HCI Event: Number of Completed Packets(0x13) plen 5
> ACL data: handle 0x002a flags 0x02 dlen 18
L2CAP(s): Config rsp: scid 0x004f flags 0x0000 result 0 clen 4
MTU 672
> ACL data: handle 0x002a flags 0x02 dlen 16
L2CAP(s): Config req: dcid 0x004f flags 0x0000 clen 4
MTU 256
< ACL data: handle 0x002a flags 0x02 dlen 14
L2CAP(s): Config rsp: scid 0x0103 flags 0x0000 result 0 clen 0
< ACL data: handle 0x002a flags 0x02 dlen 24
L2CAP(d): cid 0x103 len 20 [psm 1]
SDP SSA Req: tid 0x0 len 0xf
pat uuid-16 0x1116 (NAP)
max 0xffff
aid(s) 0x0004 (ProtocolDescList)
cont 00
> HCI Event: Number of Completed Packets(0x13) plen 5
> HCI Event: Number of Completed Packets(0x13) plen 5
> ACL data: handle 0x002a flags 0x02 dlen 51
L2CAP(d): cid 0x4f len 47 [psm 1]
SDP SSA Rsp: tid 0x0 len 0x2a
cnt 0x27
srv rec #0
aid 0x0004 (ProtocolDescList)
< < uuid-16 0x0100 (L2CAP) uint 0xf > <
uuid-16 0x000f (BNEP) uint 0x100 < uint 0x800 uint
0x806 uint 0x8100 uint 0x86dd > > >
cont 00
< ACL data: handle 0x002a flags 0x02 dlen 12
L2CAP(s): Disconn req: dcid 0x0103 scid 0x004f
< ACL data: handle 0x002a flags 0x02 dlen 12
L2CAP(s): Connect req: psm 15 scid 0x0050
> HCI Event: Number of Completed Packets(0x13) plen 5
> ACL data: handle 0x002a flags 0x02 dlen 12
L2CAP(s): Disconn rsp: dcid 0x0103 scid 0x004f
> HCI Event: Number of Completed Packets(0x13) plen 5
> ACL data: handle 0x002a flags 0x02 dlen 16
L2CAP(s): Connect rsp: dcid 0x0203 scid 0x0050 result 1 status 1
> HCI Event: Link Key Request(0x17) plen 6
< HCI Command: Link Key Request Reply(0x01|0x000b) plen 22
> HCI Event: Command Complete(0x0e) plen 10
> HCI Event: Encrypt Change(0x08) plen 4
> ACL data: handle 0x002a flags 0x02 dlen 16
L2CAP(s): Connect rsp: dcid 0x0203 scid 0x0050 result 0 status 0
< ACL data: handle 0x002a flags 0x02 dlen 16
L2CAP(s): Config req: dcid 0x0203 flags 0x0000 clen 4
MTU 1691
> HCI Event: Number of Completed Packets(0x13) plen 5
> ACL data: handle 0x002a flags 0x02 dlen 18
L2CAP(s): Config rsp: scid 0x0050 flags 0x0000 result 0 clen 4
MTU 1691
> ACL data: handle 0x002a flags 0x02 dlen 16
L2CAP(s): Config req: dcid 0x0050 flags 0x0000 clen 4
MTU 1691
< ACL data: handle 0x002a flags 0x02 dlen 14
L2CAP(s): Config rsp: scid 0x0203 flags 0x0000 result 0 clen 0
< ACL data: handle 0x002a flags 0x02 dlen 11
L2CAP(d): cid 0x203 len 7 [psm 15]
BNEP: Control(0x01|0)
Setup Req(0x01) size 0x02 dst 0x1116(NAP) src 0x1115(PANU)
> HCI Event: Number of Completed Packets(0x13) plen 5
> HCI Event: Number of Completed Packets(0x13) plen 5
> ACL data: handle 0x002a flags 0x02 dlen 8
L2CAP(d): cid 0x50 len 4 [psm 15]
BNEP: Control(0x01|0)
Setup Rsp(0x02) res 0x0000
< ACL data: handle 0x002a flags 0x02 dlen 341
L2CAP(d): cid 0x203 len 337 [psm 15]
BNEP: Compressed DestOnly(0x04|0)
dst ff:ff:ff:ff:ff:ff [proto 0x0800]
> HCI Event: Number of Completed Packets(0x13) plen 5
> HCI Event: Mode Change(0x14) plen 6
< ACL data: handle 0x002a flags 0x02 dlen 341
L2CAP(d): cid 0x203 len 337 [psm 15]
BNEP: Compressed DestOnly(0x04|0)
dst ff:ff:ff:ff:ff:ff [proto 0x0800]
> HCI Event: Number of Completed Packets(0x13) plen 5
< ACL data: handle 0x002a flags 0x02 dlen 341
L2CAP(d): cid 0x203 len 337 [psm 15]
BNEP: Compressed DestOnly(0x04|0)
dst ff:ff:ff:ff:ff:ff [proto 0x0800]
> HCI Event: Number of Completed Packets(0x13) plen 5
< ACL data: handle 0x002a flags 0x02 dlen 341
L2CAP(d): cid 0x203 len 337 [psm 15]
BNEP: Compressed DestOnly(0x04|0)
dst ff:ff:ff:ff:ff:ff [proto 0x0800]
> HCI Event: Number of Completed Packets(0x13) plen 5
< ACL data: handle 0x002a flags 0x02 dlen 341
L2CAP(d): cid 0x203 len 337 [psm 15]
BNEP: Compressed DestOnly(0x04|0)
dst ff:ff:ff:ff:ff:ff [proto 0x0800]
> HCI Event: Number of Completed Packets(0x13) plen 5
< ACL data: handle 0x002a flags 0x02 dlen 341
L2CAP(d): cid 0x203 len 337 [psm 15]
BNEP: Compressed DestOnly(0x04|0)
dst ff:ff:ff:ff:ff:ff [proto 0x0800]
> HCI Event: Number of Completed Packets(0x13) plen 5
< ACL data: handle 0x002a flags 0x02 dlen 341
L2CAP(d): cid 0x203 len 337 [psm 15]
BNEP: Compressed DestOnly(0x04|0)
dst ff:ff:ff:ff:ff:ff [proto 0x0800]
> HCI Event: Number of Completed Packets(0x13) plen 5
< ACL data: handle 0x002a flags 0x02 dlen 341
L2CAP(d): cid 0x203 len 337 [psm 15]
BNEP: Compressed DestOnly(0x04|0)
dst ff:ff:ff:ff:ff:ff [proto 0x0800]
> HCI Event: Number of Completed Packets(0x13) plen 5
< ACL data: handle 0x002a flags 0x02 dlen 41
L2CAP(d): cid 0x203 len 37 [psm 15]
BNEP: Compressed DestOnly(0x04|0)
dst ff:ff:ff:ff:ff:ff [proto 0x0806]
> HCI Event: Number of Completed Packets(0x13) plen 5
< ACL data: handle 0x002a flags 0x02 dlen 41
L2CAP(d): cid 0x203 len 37 [psm 15]
BNEP: Compressed DestOnly(0x04|0)
dst ff:ff:ff:ff:ff:ff [proto 0x0806]
> HCI Event: Number of Completed Packets(0x13) plen 5
well, it looks like your device told btpand(8) that it can not accept
more than 672 bytes (default l2cap mtu) at a time. hence the emsgsize
error, i.e. datagram, btpand(8) is trying to send, is too big for
remote device to accept. quick fix would be to adjust mtu on the tap
interface to make sure btpand(8) never tries to send more than 672
bytes of payload.
I did try mtu=650 on my tap interface, but then large http transfers are
stalled after some seconds. I will check again when this actual problem
is solved.
except that client_init() requires that the negotiated outgoing MTU be at
least the BNEP minimum MTU (1691), and bnep_send will fail if the packet
is larger than the channel MTU ..
Andreas, can you add some debug to the end of bnep_send() something like
if (nw == -1) {
uint16_t mtu;
socklen_t len = sizeof(mtu);
getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_OMTU,&mtu,&len);
log_err("writev failed: %m (mtu %d)\n", mtu);
}
?
Yes, I used the code fragment
{
uint16_t mtu;
socklen_t len = sizeof(mtu);
getsockopt(chan->fd, SOL_L2CAP, SO_L2CAP_OMTU,&mtu,&len);
log_err("writev: %m (mtu %d)\n", mtu);
}
and found mtu=1691 in all cases (ok or failed), same for SO_L2CAP_IMTU.
Andreas Longwitz
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