Dears,
not sure, if this is the right place and i have no idea how to develope this or adress an idea, but maybe somebody read this and can forward to the right person in charge: I have some rules defined in smart things and a lot of them beginning with: “If I am at home…”.
Problem: “At Home” is a really big area. I think it is based on GPS a radius of 250 meters. Means; My programmed rule is active even i am sitting by the neighborhood. Better idea: I am at home, if my mobilephone logon into my home WiFi. Than i can programming sensefull things: Open the garage, turn on the lights and so on.
It would be really great, if this will be possible.
Cheers.
Add a virtual switch which triggers the automation you wish.
Then, through IFTTT make an applet such that when you log into home WiFi your virtual switch opens.
Winner.
Winner.
Roast beef dinner!
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As of this writing Smartthings allows you to create a “simulated presence sensor” Which is a virtual device that you can turn on and off with other conditions occurred.
So there are indeed some people who use check ins to their own Wi-Fi system for presence detection. Others, like myself, need an even smaller geopresence region. So I use an IBeacon combined with IFTTT.
Others use other methods.
There is a community FAQ about this, but all of the examples are from the old version of the app, so at this point it’s more of a proof of concept topic then a specific how to. But it can definitely be done. 
See the FAQ (the topic title is a clickable link)