1. WT series encoders can be found here: https://github.com/Milesight-IoT/SensorDecoders
2. If you did not find the encoders from Payload Codec page of Milesight gateway, please upgrade the gateway to latest firmwares, then click Obtain to update the payload codec library.
Besides, you can also upload the library locally: Locally Upload Payload Codec Library file to Milesight Gateway
3. If you need to use BACnet feature of Milesight gateway to achieve the control of WT series, please know about BACnet integration on Milesight gateways first:
How to Integrate LoRaWAN Sensor to BACnet BMS System via Milesight Gateway
How to Send Downlink from BACnet System via Milesight Gateway
Besides, please refer to the BACnet control point list at the end of user guides:
WT101: https://resource.milesight.com/milesight/iot/document/wt101-user-guide-en.pdf
WT201: https://resource.milesight.com/milesight/iot/document/wt201-user-guide-en.pdf
WT301&302: https://resource.milesight.com/milesight/iot/document/wt30x-user-guide-en.pdf