Function floatsecondsgetfn 

pub fn floatsecondsgetfn() -> f64

Port of floatsecondsgetfn(UNUSED(Param pm)) from Src/params.c:4591. C body: return (double)(now-tv_sec - shtimer.tv_sec) + nsec/1e9; WARNING: param names don’t match C — Rust=() vs C=(pm)