The updated timeline calls out 3rd party DTHs being migrated:
The platform FAQ has a list of options for what will happen to devices using custom DTHs:
If you have SmartThings hub connected devices and use custom Groovy Device Type Handlers (DTHs) installed from SmartThings Groovy IDE, you can try the options below to prepare your device for migration. We recommend you perform these actions before **December 2022,** to avoid any loss of features for your device.Note: Deleting a device in SmartThings will remove it from all the Routines, Scenes, or Services it is associated with.
- Option 1: Wait for SmartThings to migrate your Zigbee or Z-Wave device to the closest supported SmartThings Edge driver. This process begins September 30, 2022 and will be completed gradually over the next several months. The SmartThings Edge driver may have different functionality than the original custom Groovy DTH. This option is for devices that may already have a supported Lua driver and will NOT be migrated to a generic “Thing” (Some of which are listed below).