From c2e1b75946b44987b4dd4fdc77af1704b2f2ffe4 Mon Sep 17 00:00:00 2001
From: Gregory Kuhn <gregory.kuhn@analog.com>
Date: Wed, 20 Jun 2018 10:07:37 +0100
Subject: [PATCH 1/2] adding TCP_NODELAY socket flag to server socket to reduce
 transaction latency

---
 erpc_c/transports/erpc_tcp_transport.cpp | 8 ++++++++
 erpc_python/erpc/transport.py            | 1 +
 2 files changed, 9 insertions(+)

diff --git a/erpc_c/transports/erpc_tcp_transport.cpp b/erpc_c/transports/erpc_tcp_transport.cpp
index 269ee0268..72ee9b493 100644
--- a/erpc_c/transports/erpc_tcp_transport.cpp
+++ b/erpc_c/transports/erpc_tcp_transport.cpp
@@ -39,6 +39,7 @@
 #include <netdb.h>
 #include <signal.h>
 #include <string>
+#include <netinet/tcp.h>
 #include <sys/socket.h>
 #include <sys/types.h>
 #include <unistd.h>
@@ -299,6 +300,13 @@ void TCPTransport::serverThread(void)
         ::close(serverSocket);
         return;
     }
+    result = setsockopt(serverSocket, SOL_TCP, TCP_NODELAY, &yes, sizeof(yes));
+    if (result < 0)
+    {
+        TCP_DEBUG_ERR("setsockopt failed");
+        ::close(serverSocket);
+        return;
+    }
 
     // Bind socket to address.
     result = bind(serverSocket, (struct sockaddr *)&serverAddress, sizeof(serverAddress));
diff --git a/erpc_python/erpc/transport.py b/erpc_python/erpc/transport.py
index 747e905c8..390cd5ac8 100644
--- a/erpc_python/erpc/transport.py
+++ b/erpc_python/erpc/transport.py
@@ -149,6 +149,7 @@ def _serve(self):
         s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
         s.setblocking(1)
         s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+        s.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
         s.bind((self._host, self._port))
         s.listen(5)
 

From a9b7601d78e668432bba942e98568a7f33584de9 Mon Sep 17 00:00:00 2001
From: Gregory Kuhn <gregory.kuhn@analog.com>
Date: Sun, 15 Jul 2018 13:38:33 +0100
Subject: [PATCH 2/2] Adding redifine for SOL_TCP if it's not defined in
 included headers or referenced header is missing

---
 erpc_c/transports/erpc_tcp_transport.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/erpc_c/transports/erpc_tcp_transport.cpp b/erpc_c/transports/erpc_tcp_transport.cpp
index 72ee9b493..a23777764 100644
--- a/erpc_c/transports/erpc_tcp_transport.cpp
+++ b/erpc_c/transports/erpc_tcp_transport.cpp
@@ -58,6 +58,9 @@ using namespace erpc;
 #define TCP_DEBUG_ERR(_msg_)
 #endif
 
+#ifndef SOL_TCP
+#define SOL_TCP IPPROTO_TCP
+#endif
 ////////////////////////////////////////////////////////////////////////////////
 // Code
 ////////////////////////////////////////////////////////////////////////////////