FFT output to ZMQ socket proof of concept #1199
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Signed-off-by: Jeff Long <[email protected]>
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When the waterfall is updated with a new fft line, the fft output for that line is copied to a ZMQ ipc socket /tmp/gqrx_zmq_fft.sock. Each message has 2 parts. The first is JSON formatted metadata, containing timestamp, frequency, rate and fftsize.
Sample programs to use this data are included in the scripts directory. There is a recorder program that creates meta and data files in /tmp, and a numpy-based plotter program (a certain, constant fftsize is assumed).
ZMQ development files are required, CMake files now look for ZMQ.
For C++ JSON, nlohmann/json (single file) has been copied in.
This branch is based on another branch currently, to make development easier. It can be rebased elsewhere when needed.