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How can i visualize this in rviz ?

std_msgs/String does not have a display type in RViz at the moment. It would also seem to be difficult, as plain strings do not carry any intrinsic semantic meaning (ie: automated interpretation is rather difficult).

More specifically, RViz renders messages in a 3D context, so it requires spatial information (initially) to be able to do that. It uses the frame_id field (ie: TF) in incoming messages for that.

std_msgs/String does not have that, so it cannot be visualised like this.