Secure Simple Pairing Mode - Setting NoInputNoOutput mode

Secure Simple Pairing Mode - Setting NoInputNoOutput mode

[Tim Bennett]

Is there a method (programmatic or hciconfig - type) to change the Mode of a
BT v2.1 dongle to require NoInputNoOutput/JustWorks pairing?

I want to make my box (running linux 2.6.30.2 kernel on an arm processor
with Bluez 4.67 and a Broadcom v2.1 dongle) pair with another device in the
"JustWorks" (NoInputNoOutput) mode.

1. The SSP mode seems to default to "Numeric Comparison" mode.  I am trying
to find out how to switch to "Just Works" (NoInputNoOutput mode)
Can someone point me to a command or code that would switch my adapter into
the NoInputNoOutput mode?
Is it something I can configure through hciconfig or through a dbus command?

  2. The man page for hciconfig has the command hciconfig hciX sspmode
[mode].  Is [mode] only valid for 0 or 1?

In looking in hciconfig.c, at the
hci_read_simple_pairing_mode/hci_write_simple_pairing_mode functions, there
is no clear indication as to what the accepted values are for [mode}

Tim Bennett

Re: Secure Simple Pairing Mode - Setting NoInputNoOutput mode

[Johan Hedberg]

Hi Tim,

On Fri, Jul 16, 2010, Tim Bennett wrote:
> Is there a method (programmatic or hciconfig - type) to change the Mode of a
> BT v2.1 dongle to require NoInputNoOutput/JustWorks pairing?
> 
> I want to make my box (running linux 2.6.30.2 kernel on an arm processor
> with Bluez 4.67 and a Broadcom v2.1 dongle) pair with another device in the
> "JustWorks" (NoInputNoOutput) mode.
> 
> 1. The SSP mode seems to default to "Numeric Comparison" mode.  I am trying
> to find out how to switch to "Just Works" (NoInputNoOutput mode)
> Can someone point me to a command or code that would switch my adapter into
> the NoInputNoOutput mode?
> Is it something I can configure through hciconfig or through a dbus command?
> 
>  2. The man page for hciconfig has the command hciconfig hciX sspmode
> [mode].  Is [mode] only valid for 0 or 1?
> 
> In looking in hciconfig.c, at the
> hci_read_simple_pairing_mode/hci_write_simple_pairing_mode functions, there
> is no clear indication as to what the accepted values are for [mode}

You're looking a bit in the wrong place. What you want is an agent that
registers "NoInputNoOutput" as its IO capability. You could e.g.
experiment by using test/simple-agent. Find the two places in it that
say "DisplayYesNo" and change them to "NoInputNoOutput". Then you can
use that script as a "just works" pairing initator or acceptor.

Johan

Re: Secure Simple Pairing Mode - Setting NoInputNoOutput mode

[Tim Bennett]

Hello Johan
On 16-Jul-10 7:37 PM, Johan Hedberg wrote:
> Hi Tim,
>
> On Fri, Jul 16, 2010, Tim Bennett wrote:
>    
>> Is there a method (programmatic or hciconfig - type) to change the Mode of a
>> BT v2.1 dongle to require NoInputNoOutput/JustWorks pairing?
>>
>> I want to make my box (running linux 2.6.30.2 kernel on an arm processor
>> with Bluez 4.67 and a Broadcom v2.1 dongle) pair with another device in the
>> "JustWorks" (NoInputNoOutput) mode.
>>
>> 1. The SSP mode seems to default to "Numeric Comparison" mode.  I am trying
>> to find out how to switch to "Just Works" (NoInputNoOutput mode)
>> Can someone point me to a command or code that would switch my adapter into
>> the NoInputNoOutput mode?
>> Is it something I can configure through hciconfig or through a dbus command?
>>
>>   2. The man page for hciconfig has the command hciconfig hciX sspmode
>> [mode].  Is [mode] only valid for 0 or 1?
>>
>> In looking in hciconfig.c, at the
>> hci_read_simple_pairing_mode/hci_write_simple_pairing_mode functions, there
>> is no clear indication as to what the accepted values are for [mode}
>>      
> You're looking a bit in the wrong place. What you want is an agent that
> registers "NoInputNoOutput" as its IO capability. You could e.g.
> experiment by using test/simple-agent. Find the two places in it that
> say "DisplayYesNo" and change them to "NoInputNoOutput". Then you can
> use that script as a "just works" pairing initator or acceptor.
>
> Johan
>    
Thank you for the kind and quick response and the helpful hint. I shall 
do as suggested!

Tim