From 7e7ef09558efdd89c3168017592978e90531f76d Mon Sep 17 00:00:00 2001
From: Helge Norberg <helge.norberg@svt.se>
Date: Wed, 13 Jul 2016 13:03:39 +0200
Subject: [PATCH] Enabled TCP keep alive on TCP connections to clients. This
 might help in discovering that a client has ungracefully disconnected. In
 that case the OSC subscription will also end, causing the server not to try
 to send OSC packages to a client that is down. This fix relates a little bit
 to #313, but is more from the server's point of view.

---
 protocol/util/AsyncEventServer.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/protocol/util/AsyncEventServer.cpp b/protocol/util/AsyncEventServer.cpp
index 8348c56b9..d404becdb 100644
--- a/protocol/util/AsyncEventServer.cpp
+++ b/protocol/util/AsyncEventServer.cpp
@@ -329,6 +329,12 @@ struct AsyncEventServer::implementation : public spl::enable_shared_from_this<im
 		
         if (!error)
 		{
+			boost::system::error_code ec;
+			socket->set_option(boost::asio::socket_base::keep_alive(true), ec);
+
+			if (ec)
+				CASPAR_LOG(warning) << print() << L" Failed to enable TCP keep-alive on socket";
+			
 			auto conn = connection::create(service_, socket, protocol_factory_, connection_set_);
 			connection_set_->insert(conn);
 
@@ -341,6 +347,11 @@ struct AsyncEventServer::implementation : public spl::enable_shared_from_this<im
 		start_accept();
     }
 
+	std::wstring print() const
+	{
+		return L"async_event_server[:" + boost::lexical_cast<std::wstring>(acceptor_.local_endpoint().port()) + L"]";
+	}
+
 	void add_client_lifecycle_object_factory(const lifecycle_factory_t& factory)
 	{
 		auto self = shared_from_this();
-- 
2.39.2