Tool to Control Fan - fanctl

[tuxd3v]

Thank you. Now it shows a status.

Code:

root@rockpro64Nas:~# service ats status
● ats.service - ATS - Active Thermal Service
  Loaded: loaded (/lib/systemd/system/ats.service; enabled; vendor preset: enabled)
  Active: active (running) since Thu 2018-11-15 16:18:13 UTC; 23s ago
Main PID: 924 (lua)
   Tasks: 1 (limit: 4915)
  CGroup: /system.slice/ats.service
          └─924 lua /usr/local/sbin/ats

Nov 15 16:18:13 rockpro64Nas systemd[1]: Started ATS - Active Thermal Service.

Now what do i have to do exactly to get the fan started

You need to plug the fan 2 pin conector in the board, red wire is(+), black is(-). 
It should start automatically, when temps above 40C