Is there an 'MQTT how to' for SmartThings

[TapioX]

You can use MQTT also T Austin MQTT Devices driver

@TAustin

I’ve added an additional driver for creating SmartThings devices that have built-in MQTT support. Device types currently supported are acceleration sensor, alarm, battery, button, CO2 contact, dimmer, energy, fan, humidity, lock, motion, generic text or numeric, presence, robot, sound, switch, temperature, moisture, shade. It can also be used to publish any MQTT message to a given topic. The README file on github has all the details. Also see this post for latest info and this post for the initial announcement.

You need Raspberry Pi or some other device where MQTT Broker is running.