From 664bbd313022e0560e787d6be7916202927cda77 Mon Sep 17 00:00:00 2001
From: Shu Chen <chenshu@google.com>
Date: Tue, 20 Sep 2016 00:07:41 +0800
Subject: [PATCH] Send DTLS-Alert(close_notify) after receiving it from peer
 (#620)

Make it specification compliant, which requires a round trip to close joiner session.
---
 src/core/meshcop/dtls.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/core/meshcop/dtls.cpp b/src/core/meshcop/dtls.cpp
index 340dba2c3..1edefcf25 100644
--- a/src/core/meshcop/dtls.cpp
+++ b/src/core/meshcop/dtls.cpp
@@ -342,6 +342,11 @@ void Dtls::Process(void)
         }
         else
         {
+            if (rval == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY)
+            {
+                mbedtls_ssl_close_notify(&mSsl);
+            }
+
             mbedtls_ssl_session_reset(&mSsl);
             mbedtls_ssl_set_hs_ecjpake_password(&mSsl, mPsk, mPskLength);
             break;