Hello, While exploring the Master API, I experienced something I didn't expect : After the last publisher ( and all subscribers ) on a topic is gone, the topic still has a type and is still returned by getTopicTypes(). Did anyone experienced this ? Is it expected ? Or is there some more complex behavior, like timeout or so ? If it s expected, then it means a topic cannot change type ? Also any reason why there isn't a similar getServiceTypes() API ? Thank you, -- AlexV