From 9d869a8b403dc426a17944336d4b577abb1f62c3 Mon Sep 17 00:00:00 2001
From: Song Guo <songguo@google.com>
Date: Tue, 9 Jan 2024 07:36:39 +0000
Subject: [PATCH 1/2] [icd] create callback to indicate an alive subscription

---
 src/app/ReadClient.cpp | 1 +
 src/app/ReadClient.h   | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/src/app/ReadClient.cpp b/src/app/ReadClient.cpp
index bbc1c68a4b87b8..f89c8bee528fa9 100644
--- a/src/app/ReadClient.cpp
+++ b/src/app/ReadClient.cpp
@@ -617,6 +617,7 @@ CHIP_ERROR ReadClient::ProcessReportData(System::PacketBufferHandle && aPayload,
             // a subscription and have a valid value for mMaxInterval which the function
             // relies on.
             //
+            mpCallback.RefreshLiveness(*this);
             err = RefreshLivenessCheckTimer();
         }
     }
diff --git a/src/app/ReadClient.h b/src/app/ReadClient.h
index 3d66f5deab02cb..38f44db9763b4b 100644
--- a/src/app/ReadClient.h
+++ b/src/app/ReadClient.h
@@ -83,6 +83,15 @@ class ReadClient : public Messaging::ExchangeDelegate
 
         virtual ~Callback() = default;
 
+        /**
+         * Used to notify a (maybe empty) report data is received from peer and the subscription and the peer is alive.
+         *
+         * This object MUST continue to exist after this call is completed. The application shall wait until it
+         * receives an OnDone call to destroy the object.
+         *
+         */
+        virtual void RefreshLiveness(const ReadClient& apReadClient) {}
+
         /**
          * Used to signal the commencement of processing of the first attribute or event report received in a given exchange.
          *

From 2765cba3fd33ba03da6f44b0a2f862928506921c Mon Sep 17 00:00:00 2001
From: "Restyled.io" <commits@restyled.io>
Date: Tue, 9 Jan 2024 15:19:21 +0000
Subject: [PATCH 2/2] Restyled by clang-format

---
 src/app/ReadClient.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/app/ReadClient.h b/src/app/ReadClient.h
index 38f44db9763b4b..ebe4de89988f7e 100644
--- a/src/app/ReadClient.h
+++ b/src/app/ReadClient.h
@@ -90,7 +90,7 @@ class ReadClient : public Messaging::ExchangeDelegate
          * receives an OnDone call to destroy the object.
          *
          */
-        virtual void RefreshLiveness(const ReadClient& apReadClient) {}
+        virtual void RefreshLiveness(const ReadClient & apReadClient) {}
 
         /**
          * Used to signal the commencement of processing of the first attribute or event report received in a given exchange.