From 6a939e941a2f7a10bc0273093da2d213c621b533 Mon Sep 17 00:00:00 2001
From: Boris Zbarsky <bzbarsky@apple.com>
Date: Wed, 27 Mar 2024 10:33:19 -0400
Subject: [PATCH] Log message send failures. (#32742)

We're not actually clearly logging when messages fail to send (e.g. due to no
route to host).  We should be.
---
 src/transport/SessionManager.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/transport/SessionManager.cpp b/src/transport/SessionManager.cpp
index 78f9d98d79600f..34237c048b11f2 100644
--- a/src/transport/SessionManager.cpp
+++ b/src/transport/SessionManager.cpp
@@ -446,7 +446,14 @@ CHIP_ERROR SessionManager::SendPreparedMessage(const SessionHandle & sessionHand
 
     if (mTransportMgr != nullptr)
     {
-        return mTransportMgr->SendMessage(*destination, std::move(msgBuf));
+        CHIP_ERROR err = mTransportMgr->SendMessage(*destination, std::move(msgBuf));
+#if CHIP_ERROR_LOGGING
+        char addressStr[Transport::PeerAddress::kMaxToStringSize] = { 0 };
+        destination->ToString(addressStr);
+
+        ChipLogError(Inet, "SendMessage() to %s failed: %" CHIP_ERROR_FORMAT, addressStr, err.Format());
+#endif // CHIP_ERROR_LOGGING
+        return err;
     }
 
     ChipLogError(Inet, "The transport manager is not initialized. Unable to send the message");