Device Handlers are the virtual representation of a physical device.
If you are new to writing Device Handlers, start with the Quick Start.
After that, read the Overview for a broad discussion about Device Handlers and where they fit in the SmartThings architecture.
The rest of the guide discusses the various components of Device Handlers primarily targeted for Hub-connected (ZigBee or Z-Wave) devices (though the common Device Handler principles and patterns apply to other devices as well).
This guide discusses Hub-connected Device Handlers. For information about LAN- and Cloud-connected Device Handlers, see this guide
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