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If TX1 is the master, you should run roscore on it, and also some nodes that have to run on TX1. You need to know the IP address of TX1, say 192.168.1.10, and the roscore port number, say 11311.

And the other machine, your PC, for example, should also install ROS. Don't run roscore on your PC, just export ROS_MASTER_URI=http://192.168.1.10:11311. and then run the node directly.

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