Thanks for all the replies
TBBmeter does exactly what I want and even has VM STM parameters already as an option. But it doesn't tell you how to set those options, is non-intuitive, has no help file and the forum is a mess.
I'm having the exact same problem as
this guy and have managed to get only the evening alarm working through near-random clicking.
As far as not recognising STM, it's far from obvious why something is going at ~50kps. It could be either the remote computer or network traffic and it never bothered me enough to complain about it.