concurrent read write loop working

relies on timeouts. Write to Networks doesn't work yet

tun/src/unix/mod.rs

@@ -50,6 +50,12 @@ impl TunInterface {
         buf[..len-4].copy_from_slice(&tmp_buf[4..len]);
         len-4
     }
+
+    #[throws]
+    #[instrument]
+    pub fn set_timeout(&self, timeout: Option<std::time::Duration>) {
+        self.socket.set_read_timeout(timeout)?;
+    }
 }
 
 #[instrument]