First of all, TurtleBot3 friends does not support ROS.
In order to use the Arduino example, you should first set the correct ID and baudrate as below.
If you have U2D2, you can connect DYNAMIXEL to change ID and buadrate, or download Arduino OpenCR examples > 08. DynamixelWorkbench > p_Monitor to OpenCR to change ID and baudrate.
FYI, the DYNAMIXEL test buttons are designed only for the burger and waffle.
Thank you very much for feedback.
Your solution doesn't work !
I restart opencr with turtlebot3 waffle via Arduino, then I have tried to control the TB3 (roslaunch turtlebot3_bringup turtlebot3_roboter.launch) and (rosrun turtlebot3_teleop turtlebot3_teleop_key). But does not work.
I just want to reconfigure TB3. Which steps should I take to get TB3 work again.