@ogiewon 's HubDuino is another thing to consider. For a few dollars less than the cost of the Xiaomi relay alone, and it can give you 4 or more channels for control. No need for the extra relays. It's dry contacts, ready to go. Just a bit more work, but Dan's a super helpful guy. I used this method for just disarm and arm of the iSmart Alarm, but if I needed more channels, that's a very good setup.
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