This is a serial communication library running on Processing for Android.
With this library, you can use FTDI devices and/or Arduino devices in your Processing sketches.
Android app to control the Red CNC 3D routing machine
...It allows the user to configure the machine properties, such as workable volume, tool size, etc. Once set, the user loads a G-Code file and gets a 3D view of the tool path. Lastly, the user can then start processing the job by sending commands to an Arduino.