ROS Matlab Compressed Image?

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Node = rosmatlab.node('Test','http://localhost:11311'); subscriber = Node.addSubscriber('/sonar_image/compressed', 'sensor_msgs/CompressedImage', 10); subscriber.addCustomMessageListener({@test_fun, Node.Node});

Good day, I have code as such. It doesn't seem to get anything though. My function does callback test_fun, however, the message returned doesn't seem to have anything