From ab6dbe620c9380f5926d665f4f0ecbf847e678f9 Mon Sep 17 00:00:00 2001
From: orignal <i2porignal@yandex.ru>
Date: Sat, 25 Oct 2025 17:57:46 -0400
Subject: [PATCH] send ack request every RTT milliseconds

---
 libi2pd_client/UDPTunnel.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libi2pd_client/UDPTunnel.cpp b/libi2pd_client/UDPTunnel.cpp
index b63168e0..a309b4e1 100644
--- a/libi2pd_client/UDPTunnel.cpp
+++ b/libi2pd_client/UDPTunnel.cpp
@@ -404,7 +404,8 @@ namespace client
 					m_RTT = 0;
 					flags |= UDP_SESSION_FLAG_RESET_PATH;
 				}	
-				if (!m_RTT || !m_AckTimerSeqn)
+				if (!m_RTT || !m_AckTimerSeqn || (!m_UnackedDatagrams.empty () &&
+					ts > m_UnackedDatagrams.back ().second + repliableDatagramInterval)) // last ack request
 				{	
 					flags |= UDP_SESSION_FLAG_ACK_REQUESTED;
 					m_UnackedDatagrams.push_back ({ m_NextSendPacketNum, ts });