I use the browser’s Developer Tools feature to see what is sent when I press the button in the web interface. I’m not aware of another way to do that in the web app but that would be nice.
The DHT I have on github works for the v1 devices but I’ll need to modify it to work with the v2 device I have now. Hari was investigating ways to provide a DHT or some other integration directly from the zmote app, but I haven’t heard how far along he is with that effort.
Update: I’ve updated the version on github to support the v2 zmote devices.
It seems like there was a break in making them, but they’re available again now on tindie. I was on a waitlist for a year or so, and finally just got mine in the last couple months. (It’s worth the wait.)