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after you launched the nodes, rosparam get <js input="" param="" name=""> (use rosparam list to find it). It's possible that another node may set this param back to js0 which is a problem for you. Alternatively, you can set a fixed name for your device. https://unix.stackexchange.com/questions/66901/how-to-bind-usb-device-under-a-static-name

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