From 809cdc40bea9633c0fccbd4362e9a490d51a1a8f Mon Sep 17 00:00:00 2001
From: Abtin Keshavarzian <abtink@google.com>
Date: Sun, 2 Jul 2023 18:35:44 -0700
Subject: [PATCH] [ncp] keep timeout zero during ramp-down in spinel
 `ADDRESS_CACHE_TABLE` (#9247)

This commit updates the NCP code to set the timeout field in spinel
`SPINEL_PROP_THREAD_ADDRESS_CACHE_TABLE` as zero when in ramp-down
mode. This ensures that the behavior of the NCP remains unchanged and
that test cases like `ncp/test-039-address-cache-table-snoop.py`,
which expect the timeout to reach zero, to pass.
---
 src/ncp/ncp_base_ftd.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ncp/ncp_base_ftd.cpp b/src/ncp/ncp_base_ftd.cpp
index fb763c449..2ba875165 100644
--- a/src/ncp/ncp_base_ftd.cpp
+++ b/src/ncp/ncp_base_ftd.cpp
@@ -1210,7 +1210,7 @@ template <> otError NcpBase::HandlePropertyGet<SPINEL_PROP_THREAD_ADDRESS_CACHE_
         if (entry.mState != OT_CACHE_ENTRY_STATE_CACHED)
         {
             SuccessOrExit(error = mEncoder.WriteBool(entry.mCanEvict));
-            SuccessOrExit(error = mEncoder.WriteUint16(entry.mTimeout));
+            SuccessOrExit(error = mEncoder.WriteUint16(entry.mRampDown ? 0 : entry.mTimeout));
             SuccessOrExit(error = mEncoder.WriteUint16(entry.mRetryDelay));
         }