I prepared dump for a time when i tried to connect:
#/usr/local/bin/hcidump
HCIDump - HCI packet analyzer ver 1.5
device: any snap_len: 65535 filter: 0xffffffff
> HCI Event: Connect Request(0x04) plen 10
< HCI Command: Accept Connection Request(0x01|0x0009) plen 7
> 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
> HCI Event: Command Complete(0x0e) plen 6
> HCI Event: Max Slots Change(0x1b) plen 3
> ACL data: handle 0x0011 flags 0x02 dlen 12
L2CAP(s): Connect req: psm 1 scid 0x0040
< ACL data: handle 0x0011 flags 0x02 dlen 16
L2CAP(s): Connect rsp: dcid 0x0051 scid 0x0040 result 0 status 0
> HCI Event: Number of Completed Packets(0x13) plen 5
> ACL data: handle 0x0011 flags 0x02 dlen 12
L2CAP(s): Config req: dcid 0x0051 flags 0x0000 clen 0
< ACL data: handle 0x0011 flags 0x02 dlen 14
L2CAP(s): Config rsp: scid 0x0040 flags 0x0000 result 0 clen 0
< ACL data: handle 0x0011 flags 0x02 dlen 12
L2CAP(s): Config req: dcid 0x0040 flags 0x0000 clen 0
> HCI Event: Number of Completed Packets(0x13) plen 5
> HCI Event: Number of Completed Packets(0x13) plen 5
> ACL data: handle 0x0011 flags 0x02 dlen 18
L2CAP(s): Config rsp: scid 0x0051 flags 0x0000 result 0 clen 4
MTU 672
> ACL data: handle 0x0011 flags 0x02 dlen 17
L2CAP(d): cid 0x51 len 13 [psm 1]
SDP SS Req: tid 0x0 len 0x8
pat uuid-16 0x1103 (DUN)
max 0x40
cont 00
< ACL data: handle 0x0011 flags 0x02 dlen 14
L2CAP(d): cid 0x40 len 10 [psm 1]
SDP SS Rsp: tid 0x0 len 0x5
tot 0x0 cur 0x0
cont 00
> HCI Event: Number of Completed Packets(0x13) plen 5
> ACL data: handle 0x0011 flags 0x02 dlen 12
L2CAP(s): Disconn req: dcid 0x0051 scid 0x0040
< ACL data: handle 0x0011 flags 0x02 dlen 12
L2CAP(s): Disconn rsp: dcid 0x0051 scid 0x0040
> HCI Event: Number of Completed Packets(0x13) plen 5
> HCI Event: Disconn Complete(0x05) plen 4
device: any snap_len: 65535 filter: 0xffffffff
> HCI Event: Connect Request(0x04) plen 10
< HCI Command: Accept Connection Request(0x01|0x0009) plen 7
> 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
> HCI Event: Command Complete(0x0e) plen 6
> HCI Event: Max Slots Change(0x1b) plen 3
> ACL data: handle 0x0011 flags 0x02 dlen 12
L2CAP(s): Connect req: psm 1 scid 0x0040
< ACL data: handle 0x0011 flags 0x02 dlen 16
L2CAP(s): Connect rsp: dcid 0x0051 scid 0x0040 result 0 status 0
> HCI Event: Number of Completed Packets(0x13) plen 5
> ACL data: handle 0x0011 flags 0x02 dlen 12
L2CAP(s): Config req: dcid 0x0051 flags 0x0000 clen 0
< ACL data: handle 0x0011 flags 0x02 dlen 14
L2CAP(s): Config rsp: scid 0x0040 flags 0x0000 result 0 clen 0
< ACL data: handle 0x0011 flags 0x02 dlen 12
L2CAP(s): Config req: dcid 0x0040 flags 0x0000 clen 0
> HCI Event: Number of Completed Packets(0x13) plen 5
> HCI Event: Number of Completed Packets(0x13) plen 5
> ACL data: handle 0x0011 flags 0x02 dlen 18
L2CAP(s): Config rsp: scid 0x0051 flags 0x0000 result 0 clen 4
MTU 672
> ACL data: handle 0x0011 flags 0x02 dlen 17
L2CAP(d): cid 0x51 len 13 [psm 1]
SDP SS Req: tid 0x0 len 0x8
pat uuid-16 0x1103 (DUN)
max 0x40
cont 00
< ACL data: handle 0x0011 flags 0x02 dlen 14
L2CAP(d): cid 0x40 len 10 [psm 1]
SDP SS Rsp: tid 0x0 len 0x5
tot 0x0 cur 0x0
cont 00
> HCI Event: Number of Completed Packets(0x13) plen 5
> ACL data: handle 0x0011 flags 0x02 dlen 12
L2CAP(s): Disconn req: dcid 0x0051 scid 0x0040
< ACL data: handle 0x0011 flags 0x02 dlen 12
L2CAP(s): Disconn rsp: dcid 0x0051 scid 0x0040
> HCI Event: Number of Completed Packets(0x13) plen 5
> HCI Event: Disconn Complete(0x05) plen 4

I hope it will help ...