ST has been in the process of migrating from the legacy Groovy based architecture that had Device Type Handlers (DTH) to the new Lua based Edge driver architecture. Your devices were probably using a custom DTH and there is no stock Edge driver than supports your device(s). I’ve read in another topic that the manufacturer supplied this link to their Edge driver channel invite where you can subscribe to their channel and install the driver for their thermostat. With your devices installed and using the Zigbee thing driver, you can change to the manufacturer’s driver in:
- The ST mobile app - In the device panel, click 3-dot menu->Driver->POPP Thermostat driver
- The ST Advanced Web App by clicking on the device in the device list and changing the driver
- The community developed ST API Browser+ by clicking on Devices->“Your Device”->Change Driver
Here is the link to the topic that discusses the Edge driver for the POPP thermostat.