[ROS2] Use node clock in FrequencyStatus diagnostic #217
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This PR adds the possibility to provide an external
rclcpp::Clock
instance to theHeaderlessTopicDiagnostic
and theFrequencyStatus
objects at construction time.This way the
FrequencyStatus
diagnostic will provide accurate results even in case the clock is not running in real time (e.g. when Gazebo's Real Time Factor is not 1).