The Professional Mobile Communication Research Group of Beijing Institute of Technology (BIT) was kind enough to send us their TETRA Wireshark dissector. They went through the specification and created ASN1 files out of the tables, I helped with the integration and cleaning to get the code into wireshark and the wireshark developers were kind enough to do a fast review and the code is now merged.

The next part is to extend the GSMTAP dissector to pass on the tetra bits to the TETRA decoder, I have already written the code, now I need to get it merged into the wireshark codebase too.

My TETRA agenda includes figuring out majority logic decision decoding with syndromes which is required for the shorted Reed Muller code used in the AACH, create a proper GNU Radio block for the decoder emitting soft bits that we can feed into our viterbi decoder… maybe I will manage to do this during my vacation in Taiwan… who knows.