How to set packet type and how to see which packet type is in use ?

How to set packet type and how to see which packet type is in use ?

[Kasper Revsbech]

Hi
I am trying to compare some different Bluetooth setup. Doing that I 
would like to try with different baseband packet types.
So far I have been trying in two scenarios using hciconfig hci0 ptype 
<type> and that seems to work, at least in the case where I am using 
RFCOMM sockets for communication. But judging from the transfer rate it 
does not seem to work using a PAND/BNEP setup. This leads to the 
following questions:

 - How can I observe the currently uses packet type? I have been trying 
with hcidump and even parsed it with wireshark but can't really find the 
identifier that identifies witch packet type currently  is in use.

 - Can I by somehow set the packettype using setsocktop() on a rfcomm 
socket ? I have been look to find documentation on the content of the 
sockopt struc used but can't really find any. I have also tried looking 
in the code but can't figure out how to manipulate the packet type else 
that using hciconfig

Thanks
Kasper Revsbech

Re: How to set packet type and how to see which packet type is in use ?

[Marcel Holtmann]

Hi Kasper,

> I am trying to compare some different Bluetooth setup. Doing that I  
> would like to try with different baseband packet types.
> So far I have been trying in two scenarios using hciconfig hci0  
> ptype <type> and that seems to work, at least in the case where I am  
> using RFCOMM sockets for communication. But judging from the  
> transfer rate it does not seem to work using a PAND/BNEP setup. This  
> leads to the following questions:
>
> - How can I observe the currently uses packet type? I have been  
> trying with hcidump and even parsed it with wireshark but can't  
> really find the identifier that identifies witch packet type  
> currently  is in use.

you can't since that is the job of the link manager and not the host  
stack.

> - Can I by somehow set the packettype using setsocktop() on a rfcomm  
> socket ? I have been look to find documentation on the content of  
> the sockopt struc used but can't really find any. I have also tried  
> looking in the code but can't figure out how to manipulate the  
> packet type else that using hciconfig

Don't mess around with packet types. Really, I mean it, don't. Leave  
the default and leave the rest up to the link manager.

Regards

Marcel