screengrab of data running in app on Pluto

I have a customer designing a radio modem using Pluto as the testbed. Cross compiling went just fine and the software is running on Pluto, but signal processing has errors (not run time, just signal is not doing what we want). I think if we can do screen capture at various points in his signal chain, that will help us solve the problem. What are best recommendations for tweaking existing example code to look at nodes in running app on Pluto? Any other ideas? FWIW - this code was exported from Matlab, not sure if that has any bearing on the solution, but throwing it out there.. 

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