I got the email (on a different computer, so I don't have
it handy) but as far as I recall, there was no extra info
in there beyond what you quoted here.

The thing I thought of last and typed last in my post
above is probably the best guess. I thought of duration
first and it might be right, but less likely.

So try
900A 006D 0000 0001 EE87 80F1
for discrete On, and
900A 006D 0000 0001 EE87 40F1
for discrete Off