@TomberWolf, good question. You can have TRIGGERcmd run a "curl" command that calls the IFTTT Webhooks API to run an applet that turns your SmartThings switch on.

You'll need your IFTTT webhooks key, which you can get at this page:
https://ifttt.com/maker_webhooks/settings

You'll see a URL like this: https://maker.ifttt.com/use/asdfasdfblahblah

The bold part of that URL is your webhooks key.

Setup a TRIGGERcmd command like this, where front_light is your Webhook applet's Event Name.

curl https://maker.ifttt.com/trigger/front_light/with/key/asdfasdfblahblah

When you make your applet, search for Webhooks as your This part.

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If you use Windows, you can download curl from here.