Re: [Bluez-devel] Re: Sending own L2CAP packets to HCI

[Marcel Holtmann <marcel@holtmann.org>]

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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