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Hopefully you have found the answer and solved your problem. In case you are still struggling, please do pay attention to the naming of both the robots. Same names would mean that one robot will be dumped by ROS while starting other. different robot name will allow you to start both of them. Once done the navigation stack should also be started under the same name. You can use ROS namespace feature for this purpose. Last but not the least, in the transformation published for the whole thing you will need to have a single transform something like map connecting both the robots to your world. So map should be the root node in tf and both robot's base should be connected to it, tf_veiw can help you visualize this.

Hopefully you have found the answer and solved your problem. In case you are still struggling, please do pay attention to the naming of both the robots. Same names would mean that one robot will be dumped by ROS while starting other. different Different robot name will allow you to start both of them. Once done the navigation stack should also be started under the same name. You can use ROS namespace feature for this purpose. Last but not the least, in the transformation published for the whole thing you will need to have a single transform something like map "map" connecting both the robots to your world. So map should be the root node in tf and both robot's base should be connected to it, tf_veiw can help you visualize this. this.