Hi everyone,
Firstly, just a disclaimer. I am particularly familiar with GnuRadio at
all. However I need to interface with a GnuRadio project.
I am trying to manually decode the output of a ZMQ PUB Sink. In other
words, I have, in a completely different non-gnuradio project, a bit of
code that uses the standard python-zmq library to subscribe to the zmq
socket.
The ZMQ PUB Sink block is sitting just before the USRP block in the Tx
chain. And what I eventually want to do is effectively replicate the
spectrum display from Gnu Radio in a web app.
In my long google searches someone said the trick to decode things from
gnuradio is to use the PMT library. Now from what I could see I should use
pmt.deserialize_string(). However that does not seem to work.
>>> pmt.deserialize_str(d)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.7/dist-packages/pmt/pmt_swig.py", line 3373, in
deserialize_str
return _pmt_swig.deserialize_str(str)
RuntimeError: pmt::deserialize: malformed input stream, tag value = : 243
I thought perhaps there would be an alignment issue, but it doesn't seem to
matter where (in d) I start the deserialize command.
By the way, d above is a recording of what I saw come out of that ZMQ PUB
Sink block. I created a python-zmq socket and connected it to the ZMQ Sink
Block port and recorded everything. You can find the file here:
https://www.dropbox.com/s/9r6390lwd3kdc9o/port_5551.bin?dl=1
Any pointers would be most appreciated. Thanks in advance.
Kjetil
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