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The difference appear when using namespaces. If I am using a node with namespace "robot1" and subscribe to the topic "/my_topic" it will subscribe to this topic. But if I subscribe to the topic "my_topic" the node will subscribe to the topic "/robot1/my_topic"
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The difference appear when using namespaces. If I am using a node with namespace "robot1" and subscribe to the topic "/my_topic" it will subscribe to this topic.
But if I subscribe to the topic "my_topic" the node will subscribe to the topic "/robot1/my_topic""/robot1/my_topic".
You can add namespaces when launch a node from a launch file by using the group tag for example
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