Function nm_device_get_applied_connection 

pub unsafe extern "C" fn nm_device_get_applied_connection(
    device: *mut NMDevice,
    flags: u32,
    version_id: *mut u64,
    cancellable: *mut GCancellable,
    error: *mut *mut GError,
) -> *mut NMConnection

Available on crate feature v1_2 only.