ROSIntegration: Rosbridge connection established, but not able to publish.

Hi, I’ve set the plugin and world up as per the instructions, and on pressing play rosbridge registers a connection. But when putting the example publishing code in an actor, rosbridge does not seem to receive anything. Is there something in particular I have to do to make the code communicate properly? Thanks. This is what I have in BeginPlay():

        UTopic *ExampleTopic = NewObject<UTopic>(UTopic::StaticClass());
	UROSIntegrationGameInstance* ROSInstance = Cast<UROSIntegrationGameInstance>(GetGameInstance());
	ExampleTopic->Init(ROSInstance->ROSIntegrationCore, TEXT("/chatter"), TEXT("std_msgs/String"));


	// (Optional) Advertise the topic
	// Currently unimplemented in the plugin
	//ExamplePublishTopic->Advertise();

	// Publish a string to the topic
	TSharedPtr<ROSMessages::std_msgs::String> StringMessage(new ROSMessages::std_msgs::String("This is an example"));
	ExampleTopic->Publish(StringMessage);