sniffing 802.15.4 packets natively with Raspberry Pi and Wireshark

August 25, 2014

It turns out that Linux's 802.15.4 implementation is just about ready to facilitate promiscuous packet sniffing natively. With minimal patching, we can now use a Raspberry Pi and 802.15.4 radio to sniff raw 802.15.4 packets using Wireshark or tcpdump or whatever.

Here I'll demonstrate the method I've come to prefer: Sniffing packets on the RPi with tcpdump and sending them over wifi using netcat to Wireshark running on another (less graphically laggy) computer.

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openOBC firmware compiling and flashing

July 13, 2014

Here I document a case of compiling on Lubuntu 14.04 and flashing with lpc21isp through the openOBC's micro-USB port. This is what I'd recommend as probably the most supported setup.

The same steps can work on a variety of systems, but I'm doing this with a fresh install of Lubuntu 14.04 in Virtualbox. A normal install will have just about everything we need out of the box, but we'll probably have to install an arm-none-eabi toolchain and lpc21isp, and we may have to install git.

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openOBC oil pressure

June 29, 2014

Yeah, I finally got around to installing an oil pressure sensor in my E36 and trying it out with my openOBC. It was one of those really bizarre experiences where everything just worked without a fight.

The pressure sensor I used is a VDO 360-007. It's an 80 psi sensor with M12x1.5 threads and a warning light output at 8.5 psi. It fit perfectly in place of the factory pressure switch I replaced with it and the gauge output on it connects to the analog.in1 or in2 pins of the openOBC board, which are both set up by default to work with grounded resistive sensors like this.

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6LoWPAN kernel on a Raspberry Pi

May 26, 2014
6LoWPAN support in the Linux kernel is sufficiently new right now that you can't just use any old kernel version - you have to ensure you're using a new enough kernel if you want to do anything useful. This presents a problem since the custom kernel normally used on the Raspberry Pi is forked from an older version of the kernel. Fortunately however, support for the RPi in the vanilla kernel has reached the point where we can now run a vanilla Linux kernel on the RPi rather than the custom RPi kernel.

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