My home is wired for a security system. Any way to take advantage of this to integrate a security system into ST?

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I was able to use the door and motion sensors pre-wired in my home to communicate directly to SmartThings. The only additional hardware needed was a NodeMCU ESP8266 board (about $10).

See my post here for details: Connect wired alarm system sensors to SmartThings with a NodeMCU ESP8266 [deprecated]