made it so a negative kHeartRate disables heartbeats and set

kHeartRate to -1.

lib/client/CServerProxy.cpp

@@ -66,7 +66,8 @@ CServerProxy::mainLoop()
 			}
 
 			// check for time out
-			if (n == (UInt32)-1 || heartbeat.getTime() > kHeartRate) {
+			if (n == (UInt32)-1 ||
+				(kHeartRate >= 0.0 && heartbeat.getTime() > kHeartRate)) {
 				// send heartbeat
 				CLock lock(&m_mutex);
 				CProtocolUtil::writef(getOutputStream(), kMsgCNoop);

lib/server/CClientProxy1_0.cpp

@@ -80,12 +80,10 @@ CClientProxy1_0::mainLoop()
 
 		// check if client has stopped sending heartbeats
 		if (n == (UInt32)-1) {
-/* FIXME -- disabled to avoid masking bugs
-			if (heartTimer.getTime() > kHeartDeath) {
+			if (kHeartDeath >= 0.0 && heartTimer.getTime() > kHeartDeath) {
 				log((CLOG_NOTE "client \"%s\" is dead", getName().c_str()));
 				return;
 			}
-*/
 			continue;
 		}
 

lib/synergy/ProtocolTypes.h

@@ -13,10 +13,11 @@ static const UInt16		kDefaultPort = 24800;
 // maximum total length for greeting returned by client
 static const UInt32		kMaxHelloLength = 1024;
 
-// time between heartbeats (in seconds)
-static const double		kHeartRate = 2.0;
+// time between heartbeats (in seconds).  negative value disables
+// heartbeat.
+static const double		kHeartRate = -1.0;
 
-// time without a heartbeat that we call death
+// time without a heartbeat that constitutes death
 static const double		kHeartDeath = 3.0 * kHeartRate;
 
 // direction constants