ControlPort was reintroduced just after the 3.7.7 release so we had time
test it, but it will be available in the upcoming 3.7.8 release. The
page linked above is from our weekly development builds.
This points you to two apps that are installed with ControlPort:
gr-perf-monitorx and gr-ctrlport-monitor. Other good places to look for
usage is in our QA code. Look in gr-blocks
for qa_cpp_py_binding.py, qa_cpp_py_binding_set.py,
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