Ian,
This is opening up a lot of possibilities. Now that I have looked into Node-red I have a better understanding of what you are doing.
Question: you mention you have been reading “the web api document”. Could you be a bit more specific? I see there is a generic API client node for node-red.
Have you looked at the mobile-app plugin? It has a set of URLs which provide an API for working with the ospi, e.g. [ospi URL]/jn rerutns station information. There is also an API from the built in UI, [ospi URL]/api/status which returns a bunch of status information.
Thanks.
Dan