Hi Marcel,
i tried to change the l2ping program by using another command header.
Instead of L2CAP_ECHO_REQ and L2CAP_ECHO_RES i used L2CAP_CONN_REQ and
L2CAP_CONN_RES, because i want to build a full connection with connect,
configure and disconnect later...
It seemed that it works, but hcidump said that the connect request is
rejected.
Is it in general possible to inject own L2CAP packets (with configure
requests) to a phone by using the l2ping programm. I mean is the socket setup
in this program for this use sufficient or do i have to inject the packets
directly to the usb driver? Because i think the command reject comes from the
Bluez stack and i have to inject the L2CAP packets without using the BlueZ
stack?
HCI Command: Create Connection(0x01|0x0005) plen 13
65 CF 93 EE 02 00 18 CC 02 00 00 00 01
HCI Event: Command Status(0x0f) plen 4
00 01 05 04
HCI Event: Connect Complete(0x03) plen 11
00 29 00 65 CF 93 EE 02 00 01 00
HCI Command: Write Link Policy Settings(0x02|0x000d) plen 4
29 00 0F 00
ACL data: handle 0x0029 flags 0x02 dlen 28
L2CAP(s): Connect req: psm 17989 scid 0x4847
HCI Event: Number of Completed Packets(0x13) plen 5
01 29 00 01 00
HCI Event: Command Complete(0x0e) plen 6
01 0D 08 00 29 00
HCI Event: Page Scan Repetition Mode Change(0x20) plen 7
65 CF 93 EE 02 00 01
HCI Event: Max Slots Change(0x1b) plen 3
29 00 05
ACL data: handle 0x0029 flags 0x02 dlen 16
L2CAP(s): Connect rsp: dcid 0x0000 scid 0x0000 result 2 status 0
ACL data: handle 0x0029 flags 0x02 dlen 10
L2CAP(s): Command rej: reason 0
HCI Event: Number of Completed Packets(0x13) plen 5
01 29 00 01 00
HCI Command: Disconnect(0x01|0x0006) plen 3
29 00 13
HCI Event: Command Status(0x0f) plen 4
00 01 06 04
HCI Event: Disconn Complete(0x05) plen 4
00 29 00 16
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Hi Matthias,
> i tried to change the l2ping program by using another command header.
> Instead of L2CAP_ECHO_REQ and L2CAP_ECHO_RES i used L2CAP_CONN_REQ and
> L2CAP_CONN_RES, because i want to build a full connection with connect,
> configure and disconnect later...
> It seemed that it works, but hcidump said that the connect request is
> rejected.
> Is it in general possible to inject own L2CAP packets (with configure
> requests) to a phone by using the l2ping programm. I mean is the socket setup
> in this program for this use sufficient or do i have to inject the packets
> directly to the usb driver? Because i think the command reject comes from the
> Bluez stack and i have to inject the L2CAP packets without using the BlueZ
> stack?
you can use the L2CAP raw socket for this, but actually you should read
the Bluetooth specification and understand it.
> HCI Command: Create Connection(0x01|0x0005) plen 13
> 65 CF 93 EE 02 00 18 CC 02 00 00 00 01
> HCI Event: Command Status(0x0f) plen 4
> 00 01 05 04
> HCI Event: Connect Complete(0x03) plen 11
> 00 29 00 65 CF 93 EE 02 00 01 00
> HCI Command: Write Link Policy Settings(0x02|0x000d) plen 4
> 29 00 0F 00
> ACL data: handle 0x0029 flags 0x02 dlen 28
> L2CAP(s): Connect req: psm 17989 scid 0x4847
The PSM and the scid are looking wrong.
> HCI Event: Number of Completed Packets(0x13) plen 5
> 01 29 00 01 00
> HCI Event: Command Complete(0x0e) plen 6
> 01 0D 08 00 29 00
> HCI Event: Page Scan Repetition Mode Change(0x20) plen 7
> 65 CF 93 EE 02 00 01
> HCI Event: Max Slots Change(0x1b) plen 3
> 29 00 05
> ACL data: handle 0x0029 flags 0x02 dlen 16
>
> L2CAP(s): Connect rsp: dcid 0x0000 scid 0x0000 result 2 status 0
Read the specification. It says that result code 2 means PSM not
supported. See comment above.
Regards
Marcel
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