You need to provide data in DS18B20 compatible way. Please have a look e.g. here https://github.com/TeraHz/DS18B20/tree/master/src
The simplest way would be to put t=10000 to the named pipe which gives you 10 celcius degrees (/1000).
The simplest way would be to put t=10000 to the named pipe which gives you 10 celcius degrees (/1000).