l2cap retransmission
Hi marcel,
in l2test suppose a data mismatch or error occurs, are the packets retransmitted???? if yes, can we watch the packet retransmission in hcidump......
i have been able to see some data and sequence mismatch packets and the connection was not brought down....so i assume that retransmission must have taken place.....
regards,
manjunath
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Re: [Bluez-users] passive inquiry
Hi,
i want to know if it is possible to make a "passive inquiry", i explain better, a device A do an inquiry no find their neighbours, it is possible for a device B (in the reachability field) to know that was inquiried by device A? The applican can receive an event each time the device is inquiried?
Thank's a lot
Andrea S.
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Marcel Holtmann
maintainerRe: [Bluez-users] passive inquiry
Hi Andrea,
Quoted 6 lines
i want to know if it is possible to make a "passive inquiry", i explain better, a device A do an inquiry no find their neighbours, it is possible for a device B (in the reachability field) to know that was inquiried by device A? The applican can receive an event each time the device is inquiried?
I am going to feel stupid. The answer is no (as before).
Regards
Marcel
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Re: [Bluez-users] passive inquiry
In reply to Paolino paperinoQuoted 7 lines · Paolino paperino
Hi,
i want to know if it is possible to make a "passive inquiry", i explain better, a device A do an inquiry no find their neighbours, it is possible for a device B (in the reachability field) to know that was inquiried by device A? The applican can receive an event each time the device is inquiried?
No, unfortunately that can't work with an ordinary inquiry. The device which is scanning only receives an ID packet, which contains no information about the sender.
There are moves afoot to add more flexible forms of inquiry to the specification, but that hasn't happened yet.
pws
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Re: [Bluez-users] passive inquiry
In reply to Paolino paperinoQuoted 7 lines · Paolino paperino
Hi,
i want to know if it is possible to make a "passive inquiry", i explain better, a device A do an inquiry no find their neighbours, it is possible for a device B (in the reachability field) to know that was inquiried by device A? The applican can receive an event each time the device is inquiried?
No, that is not possible in general.
The bluetooth chip responds to the inquiry without generating any HCI events. You can see SDP requests, since those are handled by the Bluetooth stack, but that won't help you much I guess. Maybe there are vendor-specific commands to make that possible, but I don't know about any.
Fred
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Fred Schaettgen [email protected] ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/ _______________________________________________ Bluez-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/bluez-users
Re: [Bluez-users] passive inquiry
Quoted 9 lines · Fred Schaettgen
Quoted 7 lines · Paolino paperino
Hi,
i want to know if it is possible to make a "passive inquiry", i explain better, a device A do an inquiry no find their neighbours, it is possible for a device B (in the reachability field) to know that was inquiried by device A? The applican can receive an event each time the device is inquiried?
Quoted 5 lines
No, that is not possible in general.
The bluetooth chip responds to the inquiry without generating any HCI events. You can see SDP requests, since those are handled by the Bluetooth stack, but that won't help you much I guess. Maybe there are vendor-specific commands to make that possible, but I don't know about any.
No, even vendor specific commands don't help. In the inquiry procedure at the baseband no identity information flows from the inquirer to the scanner. The only thing the scanner can tell is that somebody has inquired.
As an analogy, inquiry works like this. The inquirer sends out a message which means "Can anybody who can hear me identify themselves" and gets responses like "I heard you, I'm 0x123456789abc and I'm a headset". Hence, the inquirer knows the identity of the devices that have responded but the scanners gets nothing from the inquirer.
Future changes to the inquiry spec might allow extra information to be passed from the scanner to the inquirer, but not from the inquirer to the scanner.
If the scanner responds to the inquirer and then the inquirer follows it up with a remote name request or an HCI level connection then at that point the inquirer reveals its address. In the former case, the information is available at the baseband, but is not passed up to the host. In the latter case, the host is informed of the address of the device that has connected.
However, completely passive identification, as you describe, is not possible.
- Steven
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Re: [Bluez-users] passive inquiry
Hi,
I'm using BLuez under my linux laptop and writed a java native lib that use Bluez, now i would to port the software under Zaurus...i've a question, do know where i could find a precompiled toolchain for cross compiling for the Zaurus? And can i use it?
Andrea S.
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Re: [Bluez-users] passive inquiry
http://www.uv-ac.de/opiedev/opiedev.html
Quoted 25 lines · Paolino paperino
Hi,
I'm using BLuez under my linux laptop and writed a java native lib that use Bluez, now i would to port the software under Zaurus...i've a question, do know where i could find a precompiled toolchain for cross compiling for the Zaurus? And can i use it?
Andrea S.___________________________________
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Marcel Holtmann
maintainerHi Manjunath,
Quoted 3 lines
in l2test suppose a data mismatch or error occurs, are the packets retransmitted???? if yes, can we watch the packet retransmission in hcidump......
use the source, Luke ;)
The L2CAP layer is reliable and so there can't be an error. But if there is a retransmission you will see it with hcidump.
Quoted 3 lines
i have been able to see some data and sequence mismatch packets and the connection was not brought down....so i assume that retransmission must have taken place.....
You know that l2test is a test program, do you?
Regards
Marcel
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