[riot-devel] Raspberry Pi 3 and packet sniffing

smlng s at mlng.net
Fri Jun 3 11:17:54 CEST 2016

Hi Aaron,

you say you receive garbled packets? Sounds like an issue I also had, I fixed it by lowering SPI speed from the default 5 or 6 MHz to 3 MHz, however I thought the latter is now default anyway (@Alex?). I have to look it up, but may you can try some other values like 1 or 2 MHz?

So edit `/boot/config.txt` setting `dtoverlay=at86rf233,speed=1000000` and reboot.


> Am 03.06.2016 um 11:11 schrieb Aaron Sowry <aeneby at gmail.com>:
> Hi Sebastian, Alexander,
> Thanks for the feedback. I'm using the latest Raspbian which already
> has the relevant DTS overlay and kernel features available. Basically
> all I've done is add/uncomment the following lines in
> /boot/config.txt, and reboot:
> dtoverlay=at86rf233
> dtparam=spi=on
> I then set up the monitor interface (after compiling wpan-tools) with:
> sudo iwpan phy phy0 interface add monitor0 type monitor
> sudo ip link set monitor0 up
> sudo iwpan phy phy0 set channel 0 <channel_no>
> This was sufficient on the RPi 2 for running wireshark against
> monitor0. I am getting some very strange behaviour now where maybe
> once every 5 or 6 reboots the radio suddenly starts producing garbage
> data whenever a packet is received, but rebooting results in the radio
> going silent again. I've tried different SPI speeds, different
> channels, different at86rf233 chips, even disabled the other two
> radios (bluetooth and 802.11) to eliminate possible sources of
> interference, but I'm left scratching my head. I wonder if my Pi is
> faulty, or if there is some fundamental difference between v2 and
> v3... it would be interesting to hear how you get on Sebastian!
> Alex - since I'm doing the channel setting after bringing the monitor0
> interface up, I shouldn't be affected by that bug right? Note that the
> automatically-created wpan0 interface never gets brought up.
> Regards,
> Aaron
> 2016-06-03 19:32 GMT+12:00 smlng <s at mlng.net>:
>> Hey again,
>> I forgot the pointer to [1]: https://github.com/RIOT-Makers/wpan-raspbian/wiki/Create-a-generic-Raspbian-image-with-6LoWPAN-support#31-transceiver-specific-device-tree-overlays
>> Best,
>>  Sebastian
>>> Am 03.06.2016 um 09:28 schrieb smlng <s at mlng.net>:
>>> Hey Aaron,
>>>> Am 03.06.2016 um 01:42 schrieb Aaron Sowry <aeneby at gmail.com>:
>>>> For testing I've been using a RPi 2 with Openlabs' 802.15.4 radio[1],
>>>> which was relatively easy to get working with Wireshark. The Pi
>>>> recently destroyed my SD card however, including all the config I'd
>>>> done to set it up, so I figured I'd start from scratch with an RPi 3.
>>>> I can't seem to get it working this time though, and I was just
>>>> wondering if anyone else had managed to use the RPi 3 with this radio
>>>> for packet sniffing? I can't think of any reason why it shouldn't
>>>> work, but although the radio is detected properly and is able to be
>>>> manipulated using 'iwpan', it never sees any packets (although I know
>>>> the packets are being sent correctly, because I can sniff them with
>>>> another RIOT node).
>>>> So, before I start blaming the hardware, I thought I'd ask - has
>>>> anyone else managed to do this successfully on the RPi 3 with
>>>> raspbian?
>>> I personally use the RasPi as a border router and gateway with the
>>> openlabs transceiver. Unfortunately I haven't had the time to test
>>> with the new RasPi 3B, yet.
>>> This would be bad news, if my favorite setup isn't working with Pi3
>>> anymore. I just ordered a Pi3 myself and will start testing next week,
>>> I'll report back ASAP.
>>> I assume you use latest Raspbian-Linux, with standard Kernel 4.4 and
>>> DTS overlay [1] or a custom (self-compiled) Linux-Kernel based on
>>> bluetooth-next (btn) branch?
>>> Best,
>>> Sebastian
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