This block receives ROS messages of type std_msgs::Float64. Each time the block is run by its time domain, the message content is written to the output of the block.

  RosSubscriberDouble subDouble("myNode/myTopic"); // create subscriber block

For ROS2 you have to pass the node, from where the topic is received. The ROS2 message is of type std_msgs::msg::Float64.

  RosSubscriberDouble subDouble(node, "myNode/myTopic"); // create subscriber block

The message is transmitted without time stamp. The time stamp of the signal is set to the actual time when running the block.