Re: 6lowpan on a RPi using at86rf233

[Alexander Aring <alex.aring@gmail.com>]

On Fri, Apr 03, 2015 at 08:27:44PM +0200, Guido Günther wrote:
> On Fri, Apr 03, 2015 at 04:45:02PM +0200, Alexander Aring wrote:
> > On Fri, Apr 03, 2015 at 04:36:47PM +0200, Guido Günther wrote:
> > > Hi,
> > > I'm trying to get 6lowpan to work using bluetooth-next on the above
> > > hardware[1]. I'm currently using bluetooth-next as of
> > > baf880a96859cca79208122e555e7efeabd16e4d . When I do a:
> > > 
> > >    iwpan dev wpan0 set pan_id 0xbeef
> > > 
> > > I get:
> > > 
> > >    command failed: Device or resource busy (-16)
> > > 
> > 
> > you can set the pan_id when you interface is down only.
> 
> There was an ifplugd on the pi which continued to up the device -
> damnit. Sorry for the noise. I can now ping the two devices but am
> seeing massive packet loss:

This "ifplugd" thing is a common issue, most people which using raspbian
reported similar issues.

> 
>     # ping6 -s 20   -I lowpan0  fe80::f836:9287:905c:a684 
>     PING fe80::f836:9287:905c:a684(fe80::f836:9287:905c:a684) from fe80::cb23:b779:742d:4fd2 lowpan0: 20 data bytes
>     28 bytes from fe80::f836:9287:905c:a684: icmp_seq=3 ttl=64 time=27.7 ms
>     28 bytes from fe80::f836:9287:905c:a684: icmp_seq=4 ttl=64 time=12.7 ms
>     28 bytes from fe80::f836:9287:905c:a684: icmp_seq=5 ttl=64 time=12.7 ms
>     ^C
>     --- fe80::f836:9287:905c:a684 ping statistics ---
>     16 packets transmitted, 3 received, 81% packet loss, time 15017ms
> 
> Will need to dig into this again.
>

mhh, is this a linux to linux connection? Maybe try to activate ARET
mode, you can do that with:

iwpan dev wpan0 set max_frame_retries 3

or something differs with 3, -1 will turn off the ARET mode. Value 0
will do csma handling only. All above 0 will do retransmission tries.
You should do that on both nodes and all nodes in your network need to
support AACK handling. (Automatck ACK).

Or maybe switch channel, I am running out of ideas now. :-)

- Alex