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When you run RosAria or p2os you can specify the port via a port parameter. e.g. rosrun rosaria RosAria _port:=/dev/ttyUSB0 or rosrun p2os p2os_driver _port:=/dev/ttyUSB0. When you tested it with ARIA, did you alse specify the /dev/ttyUSB0 as the port (e.g. demo -rp /dev/ttyUSB0)?

You can turn off the internal onboard computer with the switch on the side. This will give you extra battery life and prevent any possible interference with anything on that computer also using the serial port.