The threshold and the repeat interval is set by Kconfig.
The temperatures are read using the temperature framework.

Tested in host environment:

   wrc# faketemp 90 80 10
   wrc# faketemp 90 40 20
   wrc# faketemp 20 30 40

   Jan  1 10:32:09 192.168.16.7 Temperature high: \
                                  roof:90.0000 core:80.0000 case:10.0000
   Jan  1 10:33:09 192.168.16.7 Temperature high: \
                                  roof:90.0000 core:40.0000 case:20.0000
   Jan  1 10:33:18 192.168.16.7 Temperature ok: \
                                  roof:20.0000 core:30.0000 case:40.0000
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>