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Connect your robot when power is on and open a terminal in your computer.

Type "ls /dev/tty*" without quotes and hit enter. you should see at least one device, typically /dev/ttyACM0.

Often, the command to use is "sudo chmod 666 /dev/ttyACM0". You will need to know the root password to perform this command.

restart your java app and try to connect again.

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