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You can use a launch file to assign different namespaces to the nodes as shown in this tutorial under 1.4.2. Also, you can use cmd_vel_mux which allows you to assign priority levels to cmd_vel messages.

You can use a launch file to assign different namespaces to the nodes as shown in this tutorial under 1.4.2. Also, you can use cmd_vel_mux which allows you to assign priority levels to cmd_vel messages.messages which will block conflicting messages by dropping one with lower priority.