Do not delete a connection until it has not received anything for 30 seconds.

webrtc/p2p/base/port.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 36 matching lines @@
 // RFC 6544, TCP candidate encoding rules.
 extern const int DISCARD_PORT;
 extern const char TCPTYPE_ACTIVE_STR[];
 extern const char TCPTYPE_PASSIVE_STR[];
 extern const char TCPTYPE_SIMOPEN_STR[];
 
 // The minimum time we will wait before destroying a connection after creating
 // it.
 const uint32_t MIN_CONNECTION_LIFETIME = 10 * 1000;  // 10 seconds.
 
+// A connection will be declared dead if it has not received anything for this
+// long.
+const uint32_t DEAD_CONNECTION_RECEIVE_TIMEOUT = 30 * 1000;  // 30 seconds.
+
 // The timeout duration when a connection does not receive anything.
 const uint32_t WEAK_CONNECTION_RECEIVE_TIMEOUT = 2500;  // 2.5 seconds
 
 // The length of time we wait before timing out writability on a connection.
 const uint32_t CONNECTION_WRITE_TIMEOUT = 15 * 1000;  // 15 seconds
 
 // The length of time we wait before we become unwritable.
 const uint32_t CONNECTION_WRITE_CONNECT_TIMEOUT = 5 * 1000;  // 5 seconds
 
 // The number of pings that must fail to respond before we become unwritable.
@@ skipping 485 matching lines @@
   void MaybeSetRemoteIceCredentials(const std::string& ice_ufrag,
                                     const std::string& ice_pwd);
 
   // If |remote_candidate_| is peer reflexive and is equivalent to
   // |new_candidate| except the type, update |remote_candidate_| to
   // |new_candidate|.
   void MaybeUpdatePeerReflexiveCandidate(const Candidate& new_candidate);
 
   // Returns the last received time of any data, stun request, or stun
   // response in milliseconds
-  uint32_t last_received();
+  uint32_t last_received() const;
 
  protected:
   enum { MSG_DELETE = 0, MSG_FIRST_AVAILABLE };
 
   // Constructs a new connection to the given remote port.
   Connection(Port* port, size_t index, const Candidate& candidate);
 
   // Called back when StunRequestManager has a stun packet to send
   void OnSendStunPacket(const void* data, size_t size, StunRequest* req);
 
@@ skipping 66 matching lines @@
                    const rtc::PacketOptions& options);
   virtual int GetError() { return error_; }
 
  private:
   int error_;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_PORT_H_