test if udp/tcp share the same NAT port

Cargo.lock

@@ -159,6 +159,7 @@ dependencies = [
  "env_logger 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "protobuf 2.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "protobuf-codegen-pure 2.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)",

libs/hbb_common

@@ -1 +1 @@
-Subproject commit 2cc3edf0f634adcb1e290c5c8b11bc21de38e763
+Subproject commit 489ff100300235ef3b9e7820f1b13dadc75be5f8

src/rendezvous_server.rs

@@ -20,6 +20,15 @@ impl RendezvousServer {
         let mut rs = Self {
             peer_map: PeerMap::new(),
         };
+        /* // used to test if udp/tcp share the same NAT port, yes in my test
+        let addr = addr.to_string();
+        hbb_common::tokio::spawn(async {
+            let mut l = hbb_common::tokio::net::TcpListener::bind(addr).await.unwrap();
+            while let Ok((_, addr)) = l.accept().await {
+                log::debug!("Tcp peer {:?}", addr);
+            }
+        });
+        */
         while let Some(Ok((bytes, addr))) = socket.next().await {
             rs.handle_msg(&bytes, addr, &mut socket).await?;
         }