As in "Tinkerman's blog" is written, it's possible to connect ic2 devices with jack connection by passing inside a dedicated circuit. He's using a custom fw to manage it, but should be great to have this ability implemented inside the original fw.
So we could use sonoff th to control power consumption without invade a circuit with a non invasive current clamp (as SCT-013-015).
If it's permitted I post here the blog link:
Thanks Itead and thanks Tinkerman