Install the required python packages with:
pip2 install -r requirements.txt
rosrun robot-controller-server controller_server.py
roscore
roslaunch turtlebot3_bringup turtlebot3_robot.launch
rosrun robot-controller-server controller_server.py
Assign GOOGLE_APPLICATION_CREDENTIALS
GOOGLE_APPLICATION_CREDENTIALS=AthenianDemo-b41bb569b941.json