Fix: remember to flush

datman/src/remote/backup_source_responder.rs

@@ -166,6 +166,7 @@ pub fn handler_stdio() -> anyhow::Result<()> {
                 read = stdin.lock();
                 write = stdout.lock();
                 write_message(&mut write, &pointer_data)?;
+                write.flush()?;
             }
             "exit" => {
                 write_message(&mut write, &"exit")?;