WIP: backport message flow tracing to foxy

debug.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+export TRACETOOLS_TRACEPOINTS_ENABLED=1
+ros2 run full_topology full_topology &
+pid=$!
+
+sleep 2
+sudo lttng create test --output=/tmp/test
+sudo lttng enable-event --userspace 'ros2:rclcpp_publish'
+sudo lttng enable-event --userspace 'ros2:rmw_take'
+sudo lttng start
+sleep 5          # let the node run a bit
+sudo lttng stop; sudo lttng destroy
+kill $pid
+
+sudo chown dev: -R /tmp/test
+
+python - <<'PY'
+from tracetools_analysis.loading import load_file
+ev = load_file('/tmp/test/ust')
+print({e['_name'] for e in ev})
+PY