diff --git a/src/rendezvous_server.rs b/src/rendezvous_server.rs
index dea2f017..6aa923e3 100644
--- a/src/rendezvous_server.rs
+++ b/src/rendezvous_server.rs
@@ -526,6 +526,28 @@ impl RendezvousServer {
                     msg_out.set_test_nat_response(res);
                     Self::send_to_sink(sink, msg_out).await;
                 }
+                Some(rendezvous_message::Union::OnlineRequest(or)) => {
+                    log::debug!("OnlineRequest payload={:?}", or);
+                    // copy from function handle_online_request()
+                    let mut states = BytesMut::zeroed((or.peers.len() + 7) / 8);
+                    for (i, peer_id) in or.peers.iter().enumerate() {
+                        if let Some(peer) = self.pm.get_in_memory(peer_id).await {
+                            let elapsed = peer.read().await.last_reg_time.elapsed().as_millis() as i32;
+                            // bytes index from left to right
+                            let states_idx = i / 8;
+                            let bit_idx = 7 - i % 8;
+                            if elapsed < REG_TIMEOUT {
+                                states[states_idx] |= 0x01 << bit_idx;
+                            }
+                        }
+                    }
+                    let mut msg_out = RendezvousMessage::new();
+                    msg_out.set_online_response(OnlineResponse {
+                        states: states.into(),
+                        ..Default::default()
+                    });
+                    Self::send_to_sink(sink, msg_out).await;
+                }
                 Some(rendezvous_message::Union::RegisterPk(rk)) => {
                     let response = self.handle_register_pk(rk, addr).await;
                     match response {