rpar is an interface to control a robot running on a Raspberry Pi and using an Arduino for sensor and motor control.
rpar is the bash script that's mean to be run on the Raspberry Pi (or other mobile computer) to send a particular signal to the Arduino. It also prepares tty settings on the RPi for proper communication through the serial port at 9600 baud. The Arduino project, rparrcv, is a program that runs constantly on the Arduino and executes certain actions (like movement) based on serial input.
rpar <cmd> accepts the following values for <cmd>:
up - prepare the serial port
f - step forward
b - step backward
l - step left
r - step right
Use screen $PORT 9600 where $PORT is the serial port of the Arduino to access the serial monitor. W, A, S, and D can be used from here to send the respective serial outputs. It is a known issue that holding down a key will send one keypress, do nothing for a second or two, and then repeat the key - this is due to keyboard settings.