From e5066c9969a792321f0dec3dada32bfd7bbc6068 Mon Sep 17 00:00:00 2001
From: yuanjm <yuanjianmin@espressif.com>
Date: Tue, 14 Jul 2020 18:01:05 +0800
Subject: [PATCH] feat(lwip): make LWIP TCP rto time configurable

---
 components/lwip/Kconfig                       | 7 +++++++
 components/lwip/lwip                          | 2 +-
 components/lwip/port/esp32/include/lwipopts.h | 6 ++++++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/components/lwip/Kconfig b/components/lwip/Kconfig
index b352985e5d..a34a01944e 100644
--- a/components/lwip/Kconfig
+++ b/components/lwip/Kconfig
@@ -451,6 +451,13 @@ menu "LWIP"
             help
                 Enable this feature to support TCP window scaling.
 
+        config LWIP_TCP_RTO_TIME
+            int "Default TCP rto time"
+            default 3000
+            help
+                Set default TCP rto time for a reasonable initial rto.
+                In bad network environment, recommend set value of rto time to 1500.
+
     endmenu # TCP
 
     menu "UDP"
diff --git a/components/lwip/lwip b/components/lwip/lwip
index 453b291c4c..f02243aa5f 160000
--- a/components/lwip/lwip
+++ b/components/lwip/lwip
@@ -1 +1 @@
-Subproject commit 453b291c4c0752e05b585a62d32d8bb23e1538d7
+Subproject commit f02243aa5f04f6e453e83ecad4700691b9f919d0
diff --git a/components/lwip/port/esp32/include/lwipopts.h b/components/lwip/port/esp32/include/lwipopts.h
index a458fc4876..4f77df17d8 100644
--- a/components/lwip/port/esp32/include/lwipopts.h
+++ b/components/lwip/port/esp32/include/lwipopts.h
@@ -376,6 +376,12 @@
 #define TCP_RCV_SCALE                   CONFIG_TCP_RCV_SCALE
 #endif
 
+/**
+ * LWIP_TCP_RTO_TIME: TCP rto time.
+ * Default is 3 second.
+ */
+#define LWIP_TCP_RTO_TIME             CONFIG_LWIP_TCP_RTO_TIME
+
 /*
    ----------------------------------
    ---------- Pbuf options ----------