increase message expiration timeout in SSU2

libi2pd/I2NPProtocol.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -155,6 +155,7 @@ namespace tunnel
 	const unsigned int I2NP_MESSAGE_LOCAL_EXPIRATION_TIMEOUT_FACTOR = 3; // multiples of RTT
 	const unsigned int I2NP_MESSAGE_LOCAL_EXPIRATION_TIMEOUT_MIN = 200000; // in microseconds
 	const unsigned int I2NP_MESSAGE_LOCAL_EXPIRATION_TIMEOUT_MAX = 2000000; // in microseconds
+	const unsigned int I2NP_MESSAGE_LOCAL_EXPIRATION_TIMEOUT_TRANSIT = 4000000; // in microseconds
 	const unsigned int I2NP_MESSAGE_EXPIRATION_TIMEOUT = 8000; // in milliseconds (as initial RTT)
 	const unsigned int I2NP_MESSAGE_CLOCK_SKEW = 60*1000; // 1 minute in milliseconds
 

libi2pd/SSU2Session.cpp

@@ -468,7 +468,7 @@ namespace transport
 			while (!m_SendQueue.empty () && m_SentPackets.size () <= m_WindowSize)
 			{
 				auto msg = m_SendQueue.front ();
-				if (!msg || msg->IsExpired (ts) || msg->GetEnqueueTime() + m_MsgLocalExpirationTimeout < mts)
+				if (!msg || msg->IsExpired (ts) || msg->GetEnqueueTime() + I2NP_MESSAGE_LOCAL_EXPIRATION_TIMEOUT_TRANSIT < mts)
 				{
 					// drop null or expired message
 					if (msg) msg->Drop ();