Hello,
How to connect multiple DDS18B20 sensors in ESP8266 and to monitor them with Cayenne ?
Did you download the required library or not ? I think you just need to download the library.
this tutorial Display Values of Multiple DS18B20 on ESP8266 NodeMCU Web Server shows how to connect multiple DS18B20 to esp. Once you have successfully got the reading on the esp you send forward the data to cayenne using https://github.com/myDevicesIoT/Cayenne-MQTT-Arduino/blob/master/examples/Connections/ESP8266/ESP8266.ino