NAO not speaking

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I've been getting acquainted with the NAO robot through Choregraphe, and I just switched over to using ROS. I've gotten the nao_bringup to launch and I can access camera feeds and everything, but when I try to publish to /speech the robot doesn't say anything. This is what I tried: rostopic pub /speech std_msgs/String "data: 'Hello'" If I rostopic echo /speech, my message appears, but the NAO isn't saying anything.

Any ideas?