Function reattach_link 

async fn reattach_link(
    link: SessionLink,
    tethered: bool,
) -> Result<UlcpDevice<SessionLink>>

Attach to an already-wrapped link.

Administrative is the default relationship: this tool administers devices rather than tethering to them, so the handle refuses host-domain writes. Only provision — which exists to establish a host domain — asks for a tethered handle.