Uci API is set on "by router admin password".
I'm able to do it with CLI.
It doesn't work with sms utilities but only for the command "uci add". With "uci set" it works well by sms.
Commands I tried with sms : password uci set strongswan.TECSOL.keylife='28800s' -> Replaced existing value strongswan.TECSOL.keylife='28800s'
uci add strongswan preshared_keys -> nothing happened, nothing in "uci changes", nothing happened in strongswan conf file.