how can I see if nodelet is subscribing correctly

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Hi, I just wondering when I use nodelets, I can't watch if a nodelet is subscribing topics correctly using something like rosnode info . In nodelets it just show /xxx_manager/bond , and when I launch a node, I can find if it is something wrong with remap with an [unknown type] after the topic. especially when I debug a ros function wrote by other person, it drives me nuts.

Any help would be appreciated.