setting ext_temp_under_url overtemp_threshold_tC (and other ones) wit a curl call

[wooly]

I use a shelly UNI to control a ventilation system. The two relay operate "on"and "off" commands,  .
What i need is a way to set, without using the web intervace, but from a different machine, a temperature level and a callout url that would chAnge during the day.
I found the instruction to activate and diactivate directly the relay, but not on how to automatclally change the parameters during the day.