Hi Toby,
I posted all the XML files I could find onto the git site, along with a few I have created.
I was wondering if you were still interested in developing the plugin as one great addition would be the ability to control each of a 4 byte parameter under hexcheck independently as v 3.20.0.9 seems to limit it to just 2 sub types.
There does also seem to be a problem with the binarycheck - which I recently posted about in your homeseer forum page.
I am not much of a developer but would be happy to help if I'm able.
Cheers
Andy