On my TurtleBot3's raspberry pi, I hooked it up to a monitor using an HDMI and created a node that publishes a Twist() to /cmd_vel. However, when I publish something such as twist.angular.z = 0.5, this is what rostopic tells me:

leonardo@leonardo:~$ rostopic info /cmdvel Type: geometrymsgs/Twist

Publishers: * /talker (http://hidden-ip-number/)

Subscribers: None

Hypothetically publishing a twist should just make the turtlebot3 move, so I'm unsure what the cause might be. I tried changing the IP of the ROSMASTERURI and ROS_HOSTNAME from local to wlan0, but that still gives me the same result above.

Any ideas?

roslaunch turtlebot3_bringup turtlebot3_robot.launch