Function mxr_remote_uid 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn mxr_remote_uid(
    remote: *const mxr_remote_t,
    out: *mut mxr_uid_t,
) -> mxr_result_t

Writes this client’s own identifier.

Safety

remote is null or a live handle, and out points at a writable mxr_uid_t.