Increase STUN RTOs

webrtc/p2p/base/stunrequest.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.
  */
 
 #ifndef WEBRTC_P2P_BASE_STUNREQUEST_H_
 #define WEBRTC_P2P_BASE_STUNREQUEST_H_
 
 #include <map>
 #include <string>
 #include "webrtc/p2p/base/stun.h"
 #include "webrtc/base/sigslot.h"
 #include "webrtc/base/thread.h"
 
 namespace cricket {
 
 class StunRequest;
 
 const int kAllRequests = 0;
 
+// Total max timeouts: 39.75 seconds
+// For years, this was 9.5 seconds, but for networks that experience moments of
+// high RTT (such as 40s on 2G networks), this doesn't work well.
+const int STUN_TOTAL_TIMEOUT = 39750;  // milliseconds
+
 // Manages a set of STUN requests, sending and resending until we receive a
 // response or determine that the request has timed out.
 class StunRequestManager {
  public:
   StunRequestManager(rtc::Thread* thread);
   ~StunRequestManager();
 
   // Starts sending the given request (perhaps after a delay).
   void Send(StunRequest* request);
   void SendDelayed(StunRequest* request, int delay);
@@ skipping 94 matching lines @@
   StunRequestManager* manager_;
   StunMessage* msg_;
   int64_t tstamp_;
 
   friend class StunRequestManager;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_STUNREQUEST_H_