From 3c180b3f30515386713dc00c8cb403ea1c8e8e0c Mon Sep 17 00:00:00 2001
From: geky <chaster@utexas.edu>
Date: Wed, 8 Jun 2016 20:06:52 +0100
Subject: [PATCH] Implement the NSAPI_KEEPINTVL in the LWIPInterface

---
 net/LWIPInterface/LWIPInterface.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/LWIPInterface/LWIPInterface.cpp b/net/LWIPInterface/LWIPInterface.cpp
index 21b14cba0e..55f65c821c 100644
--- a/net/LWIPInterface/LWIPInterface.cpp
+++ b/net/LWIPInterface/LWIPInterface.cpp
@@ -555,6 +555,13 @@ int LWIPInterface::setsockopt(void *handle, int level, int optname, const void *
             }
 
             s->tcp->so_options |= SOF_KEEPALIVE;
+            return 0;
+
+        case NSAPI_KEEPINTVL:
+            if (optlen != sizeof(int) || s->proto != NSAPI_TCP) {
+                return NSAPI_ERROR_UNSUPPORTED;
+            }
+
             s->tcp->keep_intvl = *(int*)optval;
             return 0;