Whoops… I gave the wrong link. (That was the follow-up)
Here is the correct one.
Well, if you view the link I provided and look at the boards, they are entirely ‘IP’ driven/controlled and I think the relays are rated for 10amp. Both boards can be programmed as inputs/outputs per pin and the one board accepts the dallas temp sensor. 16 i/o’s attached to relays and the price makes it hard to pass-up for well under $50 for everything needed.
I did provide a generic sketch of a dialplan for control. But I use my own custom dialplan.
Feel free to adapt to your own needs or as a framework to get started on your project…