Can anyone shed any light on that? I can cope with the button creating the topic, but I do need to know what role the articleId plays in the process. I'm using this plugin to power comments on virtual pages, pages that don't actually exist as separate Wordpress pages, so I don't have a post id to use.
Does the articleId need to be a unique value? Must it be an integer? What's the legal range of it?
Edit: For anyone doing something similar to what I'm doing, here are the answers:
The articleId must be unique, the plugin establishes a mapping between it and a new topic id. There does not appear to be a way to tie a Wordpress article to an existing topic.
The articleId does not need to be an integer, as long as you use quotes it can be any string. It's solely used to find the topic id in NodeBB.
So if you're using it like I am, for virtual pages that don't actually exist in Wordpress, you can safely coexist with comments on normal Wordpress pages by using an alphanumeric unique id for the virtual articleIds.