2015-07-24 12:18 GMT+02:00 Alexander Aring <alex.aring@xxxxxxxxx>:
> On Fri, Jul 24, 2015 at 11:56:08AM +0200, Baptiste Clenet wrote:
>> 2015-07-24 11:48 GMT+02:00 Alexander Aring <alex.aring@xxxxxxxxx>:
>> > On Fri, Jul 24, 2015 at 11:02:30AM +0200, Baptiste Clenet wrote:
>> >> 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.
>> >
>> > Yes SAC bit means context based address compression and we don't support
>> > it. We should support it, that's what rfc6282 said. But we don't have
>> > support for that now. :-)
>> >
>> > What do you mean with "they are based on the same source code"? It's a
>> > linux<->linux communication?
>> Yes it is linux to linux transmission.
>> Yeah I understand for the support :-)
>> The question is now why my linux use context based address compression
>> if it shouldn't? Where is it (SAC) set when transmitting a message?
>>
>
> We don't set it. Which kernel do you use?
Linux 4.1.0 (yeah I should use bluetooth-next kernel)
I see that the only way it is set is when
'source address is unspecified, setting SAC'
root@OpenWrt:/# ifconfig
lowpan0 Link encap:UNSPEC HWaddr
07-7B-21-44-65-D9-6F-AC-00-00-00-00-00-00-00-00
inet6 addr: fe80::57b:2144:65d9:6fac/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1280 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
wpan0 Link encap:UNSPEC HWaddr
07-7B-21-44-65-D9-6F-AC-00-00-00-00-00-00-00-00
UP BROADCAST RUNNING NOARP MTU:127 Metric:1
RX packets:20 errors:0 dropped:0 overruns:0 frame:0
TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:300
RX bytes:1001 (1001.0 B) TX bytes:568 (568.0 B)
(There is some printk for irq as well)
root@OpenWrt:/#ip link set lowpan0 up
root@OpenWrt:/# [ 66.248286] IPv6 header dump:
[ 66.248286] version = 6
[ 66.248286] length = 36
[ 66.248286] nexthdr = 0x00
[ 66.248286] hop_lim = 1
[ 66.248286] dest = ff02::16
[ 66.281193] source address is unspecified, setting SAC
// ??
[ 66.301541] destination address is multicast: compressed to 1 octet
[ 66.313959] header len 4 skb 40
[ 66.320242] at86rf230_xmit
[ 66.340482] GINT_STAT_0 8000
[ 66.346539] at86rf230_isr
[ 66.598282] IPv6 header dump:
[ 66.598282] version = 6
[ 66.598282] length = 36
[ 66.598282] nexthdr = 0x00
[ 66.598282] hop_lim = 1
[ 66.598282] dest = ff02::16
[ 66.631184] source address is unspecified, setting SAC
[ 66.651532] destination address is multicast: compressed to 1 octet
root@OpenWrt:/# ping6 -I lowpan0 fe80::a8af:ac69:e53e:c7f1
PING fe80::a8af:ac69:e53e:c7f1(f
[ 6770.810640] IPv6 header dump:
[ 6770.810640] version = 6
[ 6770.810640] length = 40
[ 6770.810640] nexthdr = 0x3a
[ 6770.810640] hop_lim = 255
[ 6770.810640] dest = ff02::1:ff3e:c7f1
e80::a8af:ac69:e[ 6770.847947] address compression 0 bits
53e:c7f1) from f[ 6770.857961] source address unicast link-local
fe80::57b:2144:65d9:6fac iphc1 0x30
e80::57b:2144:65[ 6770.875515] destination address is multicast:
d9:6fac lowpan0:compressed to 6 octets
56 data bytes
[ 6770.893603] header len 9 skb 49
[ 6770.902635] at86rf230_xmit
[ 6770.925237] GINT_STAT_0 8000
[ 6770.931285] at86rf230_isr
[ 6771.808151] IPv6 header dump:
[ 6771.808151] version = 6
[ 6771.808151] length = 40
[ 6771.808151] nexthdr = 0x3a
[ 6771.808151] hop_lim = 255
[ 6771.808151] dest = ff02::1:ff3e:c7f1
[ 6771.842953] address compression 0 bits
[ 6771.850379] source address unicast link-local
fe80::57b:2144:65d9:6fac iphc1 0x30
[ 6771.865198] destination address is multicast: compressed to 6 octets
>
> - Alex
--
Baptiste
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