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What of ROS2 is ROS_DEBUG of ROS1 equivalent to?

ROS_DEBUG of ROS1 is equivalent to What of ROS2?

The equivalent is RCLCPP_DEBUG(logger, ...) where logger might come from your Node, like node->get_logger(), see:

Also this might be of interest:

In the future please ask questions like this on and use the ros2 tag. If you’re feeling helpful, it would be nice if you asked the question there now and answered it again, so others on can benefit.