Fun with RDS TMC
During the last weeks I worked a bit on the GNU Radio RDS implementation.
In particular I
- got rid of the libxml2 dependency
- refactored encoder and decoder
- split decoder in demodulation and parsing block
- added new parsers for some frame types
- more verbose console output
- the decoder can be extended pretty easy know (there is a dedicated parser function for each frame type)
- blocks have logging and debugging options to configure their output
- ** added TMC messages**
- the encoder can be reconfigured during runtime via UDP
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The last bullet point implies that you can connect to the receiver via netcat and change the parameters while the transmitter is running. For example, you can
- change the displayed text
- toggle the Traffic Announcement (TA) flag that is used to interrupt music and switch to radio
I played a bit around and tested interoperability with the radio in my car and some GPS navigation systems. The picture shows a TMC (Traffic Message Channel) enabled GPS device that reports a terror attack near Paderborn.
Note, if you play around with the software, please assert that you do not interfere with any public services and use minimal power to avoid this.
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