Re: What is SAM value? "ieee802154 phy0 wpan0: SAM value 0x3 not supported"

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2015-07-24 10:47 GMT+02:00 Baptiste Clenet <bapclenet@xxxxxxxxx>:
> 2015-07-24 10:31 GMT+02:00 Alexander Aring <alex.aring@xxxxxxxxx>:
>> Hi,
>>
>> On Fri, Jul 24, 2015 at 09:56:49AM +0200, Baptiste Clenet wrote:
>>> Hi,
>>>
>>> What is SAM value? I got "ieee802154 phy0 wpan0: SAM value 0x3 not
>>> supported" when I receive a ping from another board.
>>>
>>
>> I think you hit [0]. You got that because we received some 6LoWPAN frame
>> with context based address compression (the source address). See also [1].
> Yes for [0]
>
>>
>> Your options are:
>>
>>  - That the other board use stateless (means SAC = 0, see [1]) address
>>    compression.
> How may I check?
> They use both the same settings, they are based on the same source code.
SAC bit is set.
>
>>
>>  - Implement context based address compression, there was recently a
>>    RFC patch series which implemented it. This maybe depends also for
>>    handling 6CO field correctly.
> Could you provide a link? Is that ported to Bluetooth-next branch or Linux-4.1?
>
>>
>> - Alex
>>
>> [0] http://lxr.free-electrons.com/source/net/6lowpan/iphc.c#L147
>> [1] https://tools.ietf.org/html/rfc6282#section-3.1
>
>
>
> --
> Baptiste



-- 
Baptiste
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