raw mode

Bluez-users S. Vandersee 3 participants 3 messages Apr 5, 2007 – Apr 12, 2007 Bluetooth drivers

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S. Vandersee

author

2007-04-05 14:42 UTC #0 lore raw

Dear list,

if I simply change the product ID of my CSR dongle from 0a12:0001 to 0a12:0002 hciconfig will report "RAW" as device mode after rebooting:
hci0: Type: USB

	BD Address: 00:16:41:18:7A:8C ACL MTU: 0:0 SCO MTU: 0:0
	UP RUNNING RAW
	RX bytes:66 acl:0 sco:0 events:0 errors:0
	TX bytes:15 acl:0 sco:0 commands:5 errors:0

Does the Bluetooth drivers only assume it must be a raw mode because of the product ID? Or is there a "real" raw mode detected? And if there is such a raw mode how can raw frames be retrieved? Thanks!

Sebastian

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Peter Stephenson

2007-04-12 10:13 UTC #1 lore raw

Quoted 11 lines · S. Vandersee

Dear list,
if I simply change the product ID of my CSR dongle from 0a12:0001 to 0a12:0002 hciconfig will report "RAW" as device mode after rebooting:
....
Does the Bluetooth drivers only assume it must be a raw mode because of the product ID? Or is there a "real" raw mode detected? And if there is such a raw mode how can raw frames be retrieved?

As far as the device is concerned, PID 1 is the only one that supports normal Bluetooth operation. As it happens, PID 2 is used by Frontline Test Equipment for their Bluetooth sniffer, which wouldn't work unless you had the right firmware, so
this is not useful. (This is a slightly different question to what Bluez does
with a "funny" PID, but the answer to "does the device have clever handling
for PID 2" is "no".)

Signature · 18 lines

Peter Stephenson <[email protected]>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070


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Marcel Holtmann

maintainer

2007-04-12 10:26 UTC #2 lore raw

In reply to S. Vandersee

Hi Sebastian,

Quoted 10 lines

if I simply change the product ID of my CSR dongle from 0a12:0001 to 0a12:0002 hciconfig will report "RAW" as device mode after rebooting:
hci0: Type: USB
	BD Address: 00:16:41:18:7A:8C ACL MTU: 0:0 SCO MTU: 0:0
	UP RUNNING RAW
	RX bytes:66 acl:0 sco:0 events:0 errors:0
	TX bytes:15 acl:0 sco:0 commands:5 errors:0

Quoted 3 lines

Does the Bluetooth drivers only assume it must be a raw mode because of the product ID? Or is there a "real" raw mode detected? And if there is such a raw mode how can raw frames be retrieved?

the RAW flag for HCI indicates the kernel doesn't handle any higher protocol like L2CAP or RFCOMM for this device. It means you have to do everything by yourself. So in theory you can write your own Bluetooth protocol stack in userspace accessing the HCI in RAW mode and make use of the BlueZ transport drivers.

The RAW mode is not a sniffer mode. However it gets set if you attach a Bluetooth dongle from Frontline. They look like normal HCI devices, but they are not.

Regards

Marcel