<node pkg="frontier_exploration" type="explore_client" name="explore_client" output="screen"/>
<node pkg="frontier_exploration" type="explore_server" name="explore_server" output="screen">
<node pkg="frontier_exploration" type="explore_client" name="explore_client" output="screen"/>
<node pkg="frontier_exploration" type="explore_server" name="explore_server" output="screen">