[humble] Give proper log message for --start-paused (backport #1537) (

#1541)

* Add proper message for --start-paused (#1537)

Signed-off-by: Christoph Froehlich <christoph.froehlich@ait.ac.at>
(cherry picked from commit 317286c)

# Conflicts:
#	rosbag2_transport/src/rosbag2_transport/recorder.cpp

* Address merge conflicts

Signed-off-by: Michael Orlov <michael.orlov@apex.ai>

---------

Signed-off-by: Michael Orlov <michael.orlov@apex.ai>
Co-authored-by: Christoph Fröhlich <christophfroehlich@users.noreply.github.com>
Co-authored-by: Michael Orlov <michael.orlov@apex.ai>

rosbag2_transport/src/rosbag2_transport/recorder.cpp

@@ -200,7 +200,14 @@ void Recorder::record()
     discovery_future_ =
       std::async(std::launch::async, std::bind(&Recorder::topics_discovery, this));
   }
-  RCLCPP_INFO(get_logger(), "Recording...");
+
+  if (record_options_.start_paused) {
+    RCLCPP_INFO(
+      get_logger(), "Waiting for recording: Press %s to start.",
+      enum_key_code_to_str(Recorder::kPauseResumeToggleKey).c_str());
+  } else {
+    RCLCPP_INFO(get_logger(), "Recording...");
+  }
 }
 
 void Recorder::event_publisher_thread_main()