I have created a gateway transport for the SmartThings hub. It works for me but it's definitely a work in progress. There are two pieces to this:
- The MySensors gateway transport for SmartThings here.
- The SmartThings gateway device handler located here.
This is an Ethernet gateway transport that is designed to run on a Raspberry Pi 3 gateway. I have no plans right now to adapt to other platforms but feel free to contribute and add that support for other gateway devices.
SmartThings has an API that is called via an http POST method. Right now this is a one way transport and that's from MySensors to SmartThings. It doesn't handle an http request from SmartThings to the MySensors gateway. I have gotten http requests to work from SmartThings to an esp8266 and an arduino with a W5100 though, so I know it can be done. You have to host a webserver and I think it's not working on the pi because the ethernet.cpp/etherserver.cpp is custom for MySensors on linux.
You also have to install a SmartThings device handler for the MySensors gateway on SmartThings. The above repo contains the device handler and an example motion sensor device handler.
I learned a ton about the way that MySensors is working and also the way that SmartThings works. I'm happy to answer questions and share any of that knowledge as I'm able to.