Getting familiar with Contiki and Tmote Sky Sensor boards

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The WTM Scholarship (Previously Google Anita Borg Scholarship) APAC 2016

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In 2016, 50 students were selected from APAC for the WTM scholarship, and I was one of them. The scholarship includes a retreat to a Google Office, and a Scholarship Award to cover tuition fees. This year the retreat was in Hyderabad and the scholarship award was based on the country. Let me start from how I applied to the scholarship. I got to know about the "extended" scholarship deadline through my friend. Yes I would have missed it if not for the notice of it, and it was my last opportunity as an undergraduate since I was a final year student! I was really happy and applied with some doubt, but then I received a confusing email which made me apply from a different account. (since it was closer to the deadline there was no time for communication) So the application process went like that. Then due to my stressful final year, I completely forgot to check my alternative email and a friend told me that finalists are short listed. Then I logged to my email and there ...
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Install Requirements for GSM band observation with hackRF

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The GNURadio version used for this is 3.7.9. I used the live DVD image which can be downloaded from here. The extra tools needed are : hackrf_kalibrate gr-gsm gqrx  wireshark (gqrx was preinstalled in the GNURadio image). This is how I installed the other three tools. Installing gr-gsm ,  GnuRadio blocks which is used to decode GSM packets . sudo apt-get install git cmake libboost-all-dev libcppunit-dev swig doxygen liblog4cpp5-dev python-scipy git clone https://github.com/ptrkrysik/gr-gsm.git cd gr-gsm mkdir build cd build cmake .. make sudo make install sudo ldconfig I had the error "package 'libosmocore' not found", so I had to manually install that package using the commands provided in this site. cd libosmocore/ autoreconf -i ./configure make sudo make install sudo ldconfig -i cd .. And during the configuration  "No package 'talloc' found" error occurred and I had to download and install it manually with this link. ...
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Sniffing GSM traffic with hackRF

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This post is realted to my previous post , where the tools that should be pre installed are mentioned. Gqrx which is preinstalled in the live DVD can be used to visualize the frequencies. Here are examples of gqrx  tuned to different frequencies observed from channels captured from hackrf_kalibrate. (see my earlier post) Tuned to frequency 950.8MHz. Tuned to 959.6MHz. Then we need to run the grc script airprobe_rtlsdr.grc which is located at gr-gsm/apps folder found in the pre installed gr-gsm. Here is a screen shot of the flowgraph. I set the default value of gain to 40, which increases the packets captured from wireshark which is later explained. Here is a screen shot when I run the flow graph. Then we have to run wireshark from another terminal. Interface is loopback interface (lo). Use the following command, which runs wireshark as root user with icmp and gsmtap filters. sudo wireshark -k -Y 'gsmtap && !icmp' -i lo Here is a sc...
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