From 6cfb4162d7c67b70ca85f0416a63bcaae7945bff Mon Sep 17 00:00:00 2001
From: huamenggg <52490135+huamenggg@users.noreply.github.com>
Date: Wed, 25 Sep 2019 01:35:58 +0800
Subject: [PATCH] [coap] add IsBound() check in Coap::Send (#4205)

---
 src/core/coap/coap.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/coap/coap.cpp b/src/core/coap/coap.cpp
index f37d6f295..341167c4f 100644
--- a/src/core/coap/coap.cpp
+++ b/src/core/coap/coap.cpp
@@ -895,7 +895,7 @@ void Coap::HandleUdpReceive(void *aContext, otMessage *aMessage, const otMessage
 
 otError Coap::Send(ot::Message &aMessage, const Ip6::MessageInfo &aMessageInfo)
 {
-    return mSocket.SendTo(aMessage, aMessageInfo);
+    return mSocket.IsBound() ? mSocket.SendTo(aMessage, aMessageInfo) : OT_ERROR_INVALID_STATE;
 }
 
 } // namespace Coap