pub fn group_device(link: &str) -> Option<String>Expand description
The group’s device name in the value of a link field: everything before
the first : of its first word, so SR03S-VA-GPIRG-01:CTL:SP NPP MS is
SR03S-VA-GPIRG-01. A scheme:// before the name is kept with it, so a
link to loc://G:STA names the group loc://G.