Send Check-In message at boot

src/app/icd/server/ICDManager.cpp

@@ -37,6 +37,8 @@ using namespace chip::app::Clusters;
 using namespace chip::app::Clusters::IcdManagement;
 using namespace System::Clock;
 
+#define TOGGLE_STATE(state) ((state == OperationalState::IdleMode) ? OperationalState::ActiveMode : OperationalState::IdleMode)
+
 static_assert(UINT8_MAX >= CHIP_CONFIG_MAX_EXCHANGE_CONTEXTS,
               "ICDManager::mOpenExchangeContextCount cannot hold count for the max exchange count");
 
@@ -589,5 +591,16 @@ bool ICDManager::CheckInMessagesWouldBeSent()
     return false;
 }
 
+void ICDManager::TriggerCheckInMessages()
+{
+    VerifyOrReturn(SupportsFeature(Feature::kCheckInProtocolSupport));
+
+    // Check if we have any Check-In messages to send
+    // We have Check-In messages to send. Transition the device to active mode.
+    // We don't have any Check-In messages to send. Transition the device to idle mode.
+    mOperationalState = CheckInMessagesWouldBeSent() ? OperationalState::IdleMode : OperationalState::ActiveMode;
+    UpdateOperationState(TOGGLE_STATE(mOperationalState));
+}
+
 } // namespace app
 } // namespace chip

src/app/icd/server/ICDManager.h

@@ -108,6 +108,11 @@ class ICDManager : public ICDListener
     void OnICDManagementServerEvent(ICDManagementEvents event) override;
     void OnSubscriptionReport() override;
 
+    /**
+     * @brief Trigger the ICDManager to send Check-In message if necessary
+     */
+    void TriggerCheckInMessages();
+
 protected:
     friend class TestICDManager;
 

src/app/server/Server.cpp

@@ -436,6 +436,15 @@ void Server::OnPlatformEvent(const DeviceLayer::ChipDeviceEvent & event)
         }
         break;
     case DeviceEventType::kServerReady:
+#if CHIP_CONFIG_ENABLE_ICD_SERVER
+        // Only Trigger Check-In messages if we are not in the middle of a commissioning.
+        // This check is only necessary for the first commissioiner since the kServerReady event
+        // is called once we join the network.
+        if (!mFailSafeContext.IsFailSafeArmed())
+        {
+            mICDManager.TriggerCheckInMessages();
+        }
+#endif // CHIP_CONFIG_ENABLE_ICD_SERVER
 #if CHIP_CONFIG_PERSIST_SUBSCRIPTIONS
         ResumeSubscriptions();
 #endif