[Discuss-gnuradio] Plotting Data Received by USRP

[valentac]

Hey all,

Using benchmark_qt_loopback2.py as a starting point, I'm receiving digital
data from an external sensor using my own RF front end. The data is being
received correctly, but my problem is this. I'd like to plot the received
data in real-time (not the received signal) every time a correct data packet
is received. The problem is really just how to pass the data from one sink
to another source.

My last receive chain signal processing block is gr_framer_sink1. This
returns the payload with the crc which is passed up to a higher layer where
a crc check is performed. Finally, the payload is passed to my top layer.
Since this is a sink function, it doesn't pass its data to another block. I
could modify it to do this, but I require some of the higher level functions
to verify the payload. I've tried to use a vector_source and append the data
to it every time a correct packet is received and then attach that source to
my plot sink, but this does not work. The vector is correctly modified, but
this data is not passed to the plot. There's also the problem then of only
updating when the packet is received.

I realize that my method may not be the most efficient, so if you know of a
better way to accomplish this, I'd very much appreciate it.

Thanks for your help in advance!
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