src/app/icd/server/ICDManager.cpp - third_party/github/project-chip/connectedhomeip - Git at Google

 /*
  *
  *    Copyright (c) 2023 Project CHIP Authors
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
  *    You may obtain a copy of the License at
  *
  *        http://www.apache.org/licenses/LICENSE-2.0
  *
  *    Unless required by applicable law or agreed to in writing, software
  *    distributed under the License is distributed on an "AS IS" BASIS,
  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *    See the License for the specific language governing permissions and
  *    limitations under the License.
  */

 #include <app-common/zap-generated/attributes/Accessors.h>
 #include <app-common/zap-generated/ids/Attributes.h>
 #include <app-common/zap-generated/ids/Clusters.h>
 #include <app/icd/server/ICDConfigurationData.h>
 #include <app/icd/server/ICDManager.h>
 #include <app/icd/server/ICDMonitoringTable.h>
 #include <app/icd/server/ICDServerConfig.h>
 #include <lib/support/CodeUtils.h>
 #include <lib/support/logging/CHIPLogging.h>
 #include <platform/ConnectivityManager.h>
 #include <platform/LockTracker.h>
 #include <platform/internal/CHIPDeviceLayerInternal.h>
 #include <stdlib.h>

 namespace chip {
 namespace app {

 using namespace chip::app;
 using namespace chip::app::Clusters;
 using namespace chip::app::Clusters::IcdManagement;
 using namespace System::Clock;

 static_assert(UINT8_MAX >= CHIP_CONFIG_MAX_EXCHANGE_CONTEXTS,
               "ICDManager::mOpenExchangeContextCount cannot hold count for the max exchange count");

 void ICDManager::Init(PersistentStorageDelegate * storage, FabricTable * fabricTable, Crypto::SymmetricKeystore * symmetricKeystore,
                       Messaging::ExchangeManager * exchangeManager, SubscriptionsInfoProvider * manager)
 {
     VerifyOrDie(storage != nullptr);
     VerifyOrDie(fabricTable != nullptr);
     VerifyOrDie(symmetricKeystore != nullptr);
     VerifyOrDie(exchangeManager != nullptr);
     VerifyOrDie(manager != nullptr);

     // LIT ICD Verification Checks
     if (SupportsFeature(Feature::kLongIdleTimeSupport))
     {
         VerifyOrDieWithMsg(SupportsFeature(Feature::kCheckInProtocolSupport), AppServer,
                            "The CheckIn protocol feature is required for LIT support.");
         VerifyOrDieWithMsg(SupportsFeature(Feature::kUserActiveModeTrigger), AppServer,
                            "The user ActiveMode trigger feature is required for LIT support.");
         VerifyOrDieWithMsg(ICDConfigurationData::GetInstance().GetMinLitActiveModeThreshold() <=
                                ICDConfigurationData::GetInstance().GetActiveModeThreshold(),
                            AppServer, "The minimum ActiveModeThreshold value for a LIT ICD is 5 seconds.");
         // Disabling check until LIT support is compelte
         // VerifyOrDieWithMsg((GetSlowPollingInterval() <= GetSITPollingThreshold()) , AppServer,
         //                    "LIT support is required for slow polling intervals superior to 15 seconds");
     }

     VerifyOrDie(ICDNotifier::GetInstance().Subscribe(this) == CHIP_NO_ERROR);

     mStorage           = storage;
     mFabricTable       = fabricTable;
     mSymmetricKeystore = symmetricKeystore;
     mExchangeManager   = exchangeManager;
     mSubManager        = manager;

     VerifyOrDie(ICDConfigurationData::GetInstance().GetICDCounter().Init(mStorage, DefaultStorageKeyAllocator::ICDCheckInCounter(),
                                                                          ICDConfigurationData::kICDCounterPersistenceIncrement) ==
                 CHIP_NO_ERROR);

     UpdateICDMode();
     UpdateOperationState(OperationalState::IdleMode);
 }

 void ICDManager::Shutdown()
 {
     ICDNotifier::GetInstance().Unsubscribe(this);

     // cancel any running timer of the icd
     DeviceLayer::SystemLayer().CancelTimer(OnIdleModeDone, this);
     DeviceLayer::SystemLayer().CancelTimer(OnActiveModeDone, this);
     DeviceLayer::SystemLayer().CancelTimer(OnTransitionToIdle, this);

     ICDConfigurationData::GetInstance().SetICDMode(ICDConfigurationData::ICDMode::SIT);
     mOperationalState = OperationalState::ActiveMode;

     mStorage     = nullptr;
     mFabricTable = nullptr;
     mSubManager  = nullptr;

     mStateObserverPool.ReleaseAll();
     mICDSenderPool.ReleaseAll();
 }

 bool ICDManager::SupportsFeature(Feature feature)
 {
     // Can't use attribute accessors/Attributes::FeatureMap::Get in unit tests
 #if !CONFIG_BUILD_FOR_HOST_UNIT_TEST
     uint32_t featureMap = 0;
     bool success        = (Attributes::FeatureMap::Get(kRootEndpointId, &featureMap) == EMBER_ZCL_STATUS_SUCCESS);
     return success ? ((featureMap & to_underlying(feature)) != 0) : false;
 #else
     return ((mFeatureMap & to_underlying(feature)) != 0);
 #endif // !CONFIG_BUILD_FOR_HOST_UNIT_TEST
 }

 void ICDManager::SendCheckInMsgs()
 {
 #if !CONFIG_BUILD_FOR_HOST_UNIT_TEST
     VerifyOrDie(mStorage != nullptr);
     VerifyOrDie(mFabricTable != nullptr);

     uint32_t counterValue   = ICDConfigurationData::GetInstance().GetICDCounter().GetNextCheckInCounterValue();
     bool counterIncremented = false;

     for (const auto & fabricInfo : *mFabricTable)
     {
         uint16_t supported_clients = ICDConfigurationData::GetInstance().GetClientsSupportedPerFabric();

         ICDMonitoringTable table(*mStorage, fabricInfo.GetFabricIndex(), supported_clients /*Table entry limit*/,
                                  mSymmetricKeystore);
         if (table.IsEmpty())
         {
             continue;
         }

         for (uint16_t i = 0; i < table.Limit(); i++)
         {
             ICDMonitoringEntry entry(mSymmetricKeystore);
             CHIP_ERROR err = table.Get(i, entry);
             if (err == CHIP_ERROR_NOT_FOUND)
             {
                 break;
             }

             if (err != CHIP_NO_ERROR)
             {
                 // Try to fetch the next entry upon failure (should not happen).
                 ChipLogError(AppServer, "Failed to retrieved ICDMonitoring entry for Check-In msg, will try next entry.");
                 continue;
             }

             bool active = mSubManager->SubjectHasActiveSubscription(entry.fabricIndex, entry.monitoredSubject);
             if (active)
             {
                 continue;
             }

             // Increment counter only once to prevent depletion of the available range.
             if (!counterIncremented)
             {
                 counterIncremented = true;

                 if (CHIP_NO_ERROR != ICDConfigurationData::GetInstance().GetICDCounter().Advance())
                 {
                     ChipLogError(AppServer, "Incremented ICDCounter but failed to access/save to Persistent storage");
                 }
             }

             // SenderPool will be released upon transition from active to idle state
             // This will happen when all ICD Check-In messages are sent on the network
             ICDCheckInSender * sender = mICDSenderPool.CreateObject(mExchangeManager);
             VerifyOrReturn(sender != nullptr, ChipLogError(AppServer, "Failed to allocate ICDCheckinSender"));

             if (CHIP_NO_ERROR != sender->RequestResolve(entry, mFabricTable, counterValue))
             {
                 ChipLogError(AppServer, "Failed to send ICD Check-In");
             }
         }
     }
 #endif // CONFIG_BUILD_FOR_HOST_UNIT_TEST
 }

 void ICDManager::UpdateICDMode()
 {
     assertChipStackLockedByCurrentThread();

     ICDConfigurationData::ICDMode tempMode = ICDConfigurationData::ICDMode::SIT;

     // Device can only switch to the LIT operating mode if LIT support is present
     if (SupportsFeature(Feature::kLongIdleTimeSupport))
     {
         VerifyOrDie(mStorage != nullptr);
         VerifyOrDie(mFabricTable != nullptr);
         // We can only get to LIT Mode, if at least one client is registered with the ICD device
         for (const auto & fabricInfo : *mFabricTable)
         {
             // We only need 1 valid entry to ensure LIT compliance
             ICDMonitoringTable table(*mStorage, fabricInfo.GetFabricIndex(), 1 /*Table entry limit*/, mSymmetricKeystore);
             if (!table.IsEmpty())
             {
                 tempMode = ICDConfigurationData::ICDMode::LIT;
                 break;
             }
         }
     }

     if (ICDConfigurationData::GetInstance().GetICDMode() != tempMode)
     {
         ICDConfigurationData::GetInstance().SetICDMode(tempMode);
         postObserverEvent(ObserverEventType::ICDModeChange);

         // Can't use attribute accessors/Attributes::OperatingMode::Set in unit tests
 #if !CONFIG_BUILD_FOR_HOST_UNIT_TEST
         Attributes::OperatingMode::Set(kRootEndpointId, static_cast<OperatingModeEnum>(tempMode));
 #endif
     }

     // When in SIT mode, the slow poll interval SHOULDN'T be greater than the SIT mode polling threshold, per spec.
     if (ICDConfigurationData::GetInstance().GetICDMode() == ICDConfigurationData::ICDMode::SIT &&
         ICDConfigurationData::GetInstance().GetSlowPollingInterval() > ICDConfigurationData::GetInstance().GetSITPollingThreshold())
     {
         ChipLogDetail(AppServer, "The Slow Polling Interval of an ICD in SIT mode should be <= %" PRIu32 " seconds",
                       (ICDConfigurationData::GetInstance().GetSITPollingThreshold().count() / 1000));
     }
 }

 void ICDManager::UpdateOperationState(OperationalState state)
 {
     assertChipStackLockedByCurrentThread();
     // Active mode can be re-triggered.
     VerifyOrReturn(mOperationalState != state || state == OperationalState::ActiveMode);

     if (state == OperationalState::IdleMode)
     {
         mOperationalState = OperationalState::IdleMode;

         // When the active mode interval is 0, we stay in idleMode until a notification brings the icd into active mode
         // unless the device would need to send Check-In messages
         // TODO(#30281) : Verify how persistent subscriptions affects this at ICDManager::Init
         if (ICDConfigurationData::GetInstance().GetActiveModeDuration() > kZero || CheckInMessagesWouldBeSent())
         {
             DeviceLayer::SystemLayer().StartTimer(ICDConfigurationData::GetInstance().GetIdleModeDuration(), OnIdleModeDone, this);
         }

         Milliseconds32 slowPollInterval = ICDConfigurationData::GetInstance().GetSlowPollingInterval();

         // Going back to Idle, all Check-In messages are sent
         mICDSenderPool.ReleaseAll();

         CHIP_ERROR err = DeviceLayer::ConnectivityMgr().SetPollingInterval(slowPollInterval);
         if (err != CHIP_NO_ERROR)
         {
             ChipLogError(AppServer, "Failed to set Slow Polling Interval: err %" CHIP_ERROR_FORMAT, err.Format());
         }
     }
     else if (state == OperationalState::ActiveMode)
     {
         if (mOperationalState == OperationalState::IdleMode)
         {
             // An event could have brought us to the active mode.
             // Make sure the idle mode timer is stopped
             DeviceLayer::SystemLayer().CancelTimer(OnIdleModeDone, this);

             mOperationalState                 = OperationalState::ActiveMode;
             Milliseconds32 activeModeDuration = ICDConfigurationData::GetInstance().GetActiveModeDuration();

             if (activeModeDuration == kZero && !mKeepActiveFlags.HasAny())
             {
                 // A Network Activity triggered the active mode and activeModeDuration is 0.
                 // Stay active for at least Active Mode Threshold.
                 activeModeDuration = ICDConfigurationData::GetInstance().GetActiveModeThreshold();
             }

             DeviceLayer::SystemLayer().StartTimer(activeModeDuration, OnActiveModeDone, this);

             Milliseconds32 activeModeJitterInterval = Milliseconds32(ICD_ACTIVE_TIME_JITTER_MS);
             activeModeJitterInterval =
                 (activeModeDuration >= activeModeJitterInterval) ? activeModeDuration - activeModeJitterInterval : kZero;

             DeviceLayer::SystemLayer().StartTimer(activeModeJitterInterval, OnTransitionToIdle, this);

             CHIP_ERROR err =
                 DeviceLayer::ConnectivityMgr().SetPollingInterval(ICDConfigurationData::GetInstance().GetFastPollingInterval());
             if (err != CHIP_NO_ERROR)
             {
                 ChipLogError(AppServer, "Failed to set Fast Polling Interval: err %" CHIP_ERROR_FORMAT, err.Format());
             }

             if (SupportsFeature(Feature::kCheckInProtocolSupport))
             {
                 SendCheckInMsgs();
             }

             postObserverEvent(ObserverEventType::EnterActiveMode);
         }
         else
         {
             Milliseconds16 activeModeThreshold = ICDConfigurationData::GetInstance().GetActiveModeThreshold();
             DeviceLayer::SystemLayer().ExtendTimerTo(activeModeThreshold, OnActiveModeDone, this);

             Milliseconds32 activeModeJitterThreshold = Milliseconds32(ICD_ACTIVE_TIME_JITTER_MS);
             activeModeJitterThreshold =
                 (activeModeThreshold >= activeModeJitterThreshold) ? activeModeThreshold - activeModeJitterThreshold : kZero;

             if (!mTransitionToIdleCalled)
             {
                 DeviceLayer::SystemLayer().ExtendTimerTo(activeModeJitterThreshold, OnTransitionToIdle, this);
             }
         }
     }
 }

 void ICDManager::SetKeepActiveModeRequirements(KeepActiveFlags flag, bool state)
 {
     assertChipStackLockedByCurrentThread();

     mKeepActiveFlags.Set(flag, state);
     if (mOperationalState == OperationalState::IdleMode && mKeepActiveFlags.HasAny())
     {
         UpdateOperationState(OperationalState::ActiveMode);
     }
     else if (mOperationalState == OperationalState::ActiveMode && !mKeepActiveFlags.HasAny() &&
              !DeviceLayer::SystemLayer().IsTimerActive(OnActiveModeDone, this))
     {
         // The normal active period had ended and nothing else requires the system to be active.
         UpdateOperationState(OperationalState::IdleMode);
     }
 }

 void ICDManager::OnIdleModeDone(System::Layer * aLayer, void * appState)
 {
     ICDManager * pICDManager = reinterpret_cast<ICDManager *>(appState);
     pICDManager->UpdateOperationState(OperationalState::ActiveMode);

     // We only reset this flag when idle mode is complete to avoid re-triggering the check when an event brings us back to active,
     // which could cause a loop.
     pICDManager->mTransitionToIdleCalled = false;
 }

 void ICDManager::OnActiveModeDone(System::Layer * aLayer, void * appState)
 {
     ICDManager * pICDManager = reinterpret_cast<ICDManager *>(appState);

     // Don't go to idle mode when we have a keep active requirement
     if (!pICDManager->mKeepActiveFlags.HasAny())
     {
         pICDManager->UpdateOperationState(OperationalState::IdleMode);
     }
 }

 void ICDManager::OnTransitionToIdle(System::Layer * aLayer, void * appState)
 {
     ICDManager * pICDManager = reinterpret_cast<ICDManager *>(appState);

     // OnTransitionToIdle will trigger a report message if reporting is needed, which should extend the active mode until the
     // ack for the report is received.
     pICDManager->mTransitionToIdleCalled = true;
     pICDManager->postObserverEvent(ObserverEventType::TransitionToIdle);
 }

 /* ICDListener functions. */
 void ICDManager::OnKeepActiveRequest(KeepActiveFlags request)
 {
     assertChipStackLockedByCurrentThread();

     VerifyOrReturn(request < KeepActiveFlagsValues::kInvalidFlag);

     if (request.Has(KeepActiveFlag::kExchangeContextOpen))
     {
         // There can be multiple open exchange contexts at the same time.
         // Keep track of the requests count.
         this->mOpenExchangeContextCount++;
     }

     if (request.Has(KeepActiveFlag::kCheckInInProgress))
     {
         // There can be multiple check-in at the same time.
         // Keep track of the requests count.
         this->mCheckInRequestCount++;
     }

     this->SetKeepActiveModeRequirements(request, true /* state */);
 }

 void ICDManager::OnActiveRequestWithdrawal(KeepActiveFlags request)
 {
     assertChipStackLockedByCurrentThread();

     VerifyOrReturn(request < KeepActiveFlagsValues::kInvalidFlag);

     if (request.Has(KeepActiveFlag::kExchangeContextOpen))
     {
         // There can be multiple open exchange contexts at the same time.
         // Keep track of the requests count.
         if (this->mOpenExchangeContextCount > 0)
         {
             this->mOpenExchangeContextCount--;
         }
         else
         {
             ChipLogError(DeviceLayer, "The ICD Manager did not account for ExchangeContext closure");
         }

         if (this->mOpenExchangeContextCount == 0)
         {
             this->SetKeepActiveModeRequirements(KeepActiveFlag::kExchangeContextOpen, false /* state */);
         }
     }

     if (request.Has(KeepActiveFlag::kCheckInInProgress))
     {
         // There can be multiple open exchange contexts at the same time.
         // Keep track of the requests count.
         if (this->mCheckInRequestCount > 0)
         {
             this->mCheckInRequestCount--;
         }
         else
         {
             ChipLogError(DeviceLayer, "The ICD Manager did not account for Check-In Sender start");
         }

         if (this->mCheckInRequestCount == 0)
         {
             this->SetKeepActiveModeRequirements(KeepActiveFlag::kCheckInInProgress, false /* state */);
         }
     }

     if (request.Has(KeepActiveFlag::kCommissioningWindowOpen) || request.Has(KeepActiveFlag::kFailSafeArmed))
     {
         // Only 1 request per type (kCommissioningWindowOpen, kFailSafeArmed)
         // remove requirement directly
         this->SetKeepActiveModeRequirements(request, false /* state */);
     }
 }

 void ICDManager::OnNetworkActivity()
 {
     this->UpdateOperationState(OperationalState::ActiveMode);
 }

 void ICDManager::OnICDManagementServerEvent(ICDManagementEvents event)
 {
     switch (event)
     {
     case ICDManagementEvents::kTableUpdated:
         this->UpdateICDMode();
         break;

     case ICDManagementEvents::kStayActiveRequestReceived:
         // TODO : Implement the StayActiveRequest
         // https://github.com/project-chip/connectedhomeip/issues/24259
         break;
     default:
         break;
     }
 }

 void ICDManager::OnSubscriptionReport()
 {
     // If the device is already in ActiveMode, that means that all active subscriptions have already been marked dirty.
     // Since we only mark them dirty when we enter ActiveMode, it is not necessary to update the operational state a second time.
     // Doing so will only add an ActiveModeThreshold to the active time which we don't want to do here.
     VerifyOrReturn(mOperationalState == OperationalState::IdleMode);
     this->UpdateOperationState(OperationalState::ActiveMode);
 }

 ICDManager::ObserverPointer * ICDManager::RegisterObserver(ICDStateObserver * observer)
 {
     return mStateObserverPool.CreateObject(observer);
 }

 void ICDManager::ReleaseObserver(ICDStateObserver * observer)
 {
     mStateObserverPool.ForEachActiveObject([this, observer](ObserverPointer * obs) {
         if (obs->mObserver == observer)
         {
             mStateObserverPool.ReleaseObject(obs);
             return Loop::Break;
         }
         return Loop::Continue;
     });
 }

 void ICDManager::postObserverEvent(ObserverEventType event)
 {
     mStateObserverPool.ForEachActiveObject([event](ObserverPointer * obs) {
         switch (event)
         {
         case ObserverEventType::EnterActiveMode: {
             obs->mObserver->OnEnterActiveMode();
             return Loop::Continue;
         }
         case ObserverEventType::TransitionToIdle: {
             obs->mObserver->OnTransitionToIdle();
             return Loop::Continue;
         }
         case ObserverEventType::ICDModeChange: {
             obs->mObserver->OnICDModeChange();
             return Loop::Continue;
         }
         default: {
             ChipLogError(DeviceLayer, "Invalid ICD Observer event type");
             return Loop::Break;
         }
         }
     });
 }

 bool ICDManager::CheckInMessagesWouldBeSent()
 {
     for (const auto & fabricInfo : *mFabricTable)
     {
         uint16_t supported_clients = ICDConfigurationData::GetInstance().GetClientsSupportedPerFabric();

         ICDMonitoringTable table(*mStorage, fabricInfo.GetFabricIndex(), supported_clients /*Table entry limit*/,
                                  mSymmetricKeystore);
         if (table.IsEmpty())
         {
             continue;
         }

         for (uint16_t i = 0; i < table.Limit(); i++)
         {
             ICDMonitoringEntry entry(mSymmetricKeystore);
             CHIP_ERROR err = table.Get(i, entry);
             if (err == CHIP_ERROR_NOT_FOUND)
             {
                 break;
             }

             if (err != CHIP_NO_ERROR)
             {
                 // Try to fetch the next entry upon failure (should not happen).
                 ChipLogError(AppServer, "Failed to retrieved ICDMonitoring entry, will try next entry.");
                 continue;
             }

             // At least one registration would require a Check-In message
             VerifyOrReturnValue(mSubManager->SubjectHasActiveSubscription(entry.fabricIndex, entry.monitoredSubject), true);
         }
     }

     // None of the registrations would require a Check-In message
     return false;
 }

 void ICDManager::TriggerCheckInMessages()
 {
     VerifyOrReturn(SupportsFeature(Feature::kCheckInProtocolSupport));

     // Only trigger Check-In messages when we are in IdleMode.
     // If we are already in ActiveMode, Check-In messages have already been sent.
     VerifyOrReturn(mOperationalState == OperationalState::IdleMode);

     // If we don't have any Check-In messages to send, do nothing
     VerifyOrReturn(CheckInMessagesWouldBeSent());

     UpdateOperationState(OperationalState::ActiveMode);
 }

 } // namespace app
 } // namespace chip
	/*
	*
	* Copyright (c) 2023 Project CHIP Authors
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include <app-common/zap-generated/attributes/Accessors.h>
	#include <app-common/zap-generated/ids/Attributes.h>
	#include <app-common/zap-generated/ids/Clusters.h>
	#include <app/icd/server/ICDConfigurationData.h>
	#include <app/icd/server/ICDManager.h>
	#include <app/icd/server/ICDMonitoringTable.h>
	#include <app/icd/server/ICDServerConfig.h>
	#include <lib/support/CodeUtils.h>
	#include <lib/support/logging/CHIPLogging.h>
	#include <platform/ConnectivityManager.h>
	#include <platform/LockTracker.h>
	#include <platform/internal/CHIPDeviceLayerInternal.h>
	#include <stdlib.h>

	namespace chip {
	namespace app {

	using namespace chip::app;
	using namespace chip::app::Clusters;
	using namespace chip::app::Clusters::IcdManagement;
	using namespace System::Clock;

	static_assert(UINT8_MAX >= CHIP_CONFIG_MAX_EXCHANGE_CONTEXTS,
	"ICDManager::mOpenExchangeContextCount cannot hold count for the max exchange count");

	void ICDManager::Init(PersistentStorageDelegate * storage, FabricTable * fabricTable, Crypto::SymmetricKeystore * symmetricKeystore,
	Messaging::ExchangeManager * exchangeManager, SubscriptionsInfoProvider * manager)
	{
	VerifyOrDie(storage != nullptr);
	VerifyOrDie(fabricTable != nullptr);
	VerifyOrDie(symmetricKeystore != nullptr);
	VerifyOrDie(exchangeManager != nullptr);
	VerifyOrDie(manager != nullptr);

	// LIT ICD Verification Checks
	if (SupportsFeature(Feature::kLongIdleTimeSupport))
	{
	VerifyOrDieWithMsg(SupportsFeature(Feature::kCheckInProtocolSupport), AppServer,
	"The CheckIn protocol feature is required for LIT support.");
	VerifyOrDieWithMsg(SupportsFeature(Feature::kUserActiveModeTrigger), AppServer,
	"The user ActiveMode trigger feature is required for LIT support.");
	VerifyOrDieWithMsg(ICDConfigurationData::GetInstance().GetMinLitActiveModeThreshold() <=
	ICDConfigurationData::GetInstance().GetActiveModeThreshold(),
	AppServer, "The minimum ActiveModeThreshold value for a LIT ICD is 5 seconds.");
	// Disabling check until LIT support is compelte
	// VerifyOrDieWithMsg((GetSlowPollingInterval() <= GetSITPollingThreshold()) , AppServer,
	// "LIT support is required for slow polling intervals superior to 15 seconds");
	}

	VerifyOrDie(ICDNotifier::GetInstance().Subscribe(this) == CHIP_NO_ERROR);

	mStorage = storage;
	mFabricTable = fabricTable;
	mSymmetricKeystore = symmetricKeystore;
	mExchangeManager = exchangeManager;
	mSubManager = manager;

	VerifyOrDie(ICDConfigurationData::GetInstance().GetICDCounter().Init(mStorage, DefaultStorageKeyAllocator::ICDCheckInCounter(),
	ICDConfigurationData::kICDCounterPersistenceIncrement) ==
	CHIP_NO_ERROR);

	UpdateICDMode();
	UpdateOperationState(OperationalState::IdleMode);
	}

	void ICDManager::Shutdown()
	{
	ICDNotifier::GetInstance().Unsubscribe(this);

	// cancel any running timer of the icd
	DeviceLayer::SystemLayer().CancelTimer(OnIdleModeDone, this);
	DeviceLayer::SystemLayer().CancelTimer(OnActiveModeDone, this);
	DeviceLayer::SystemLayer().CancelTimer(OnTransitionToIdle, this);

	ICDConfigurationData::GetInstance().SetICDMode(ICDConfigurationData::ICDMode::SIT);
	mOperationalState = OperationalState::ActiveMode;

	mStorage = nullptr;
	mFabricTable = nullptr;
	mSubManager = nullptr;

	mStateObserverPool.ReleaseAll();
	mICDSenderPool.ReleaseAll();
	}

	bool ICDManager::SupportsFeature(Feature feature)
	{
	// Can't use attribute accessors/Attributes::FeatureMap::Get in unit tests
	#if !CONFIG_BUILD_FOR_HOST_UNIT_TEST
	uint32_t featureMap = 0;
	bool success = (Attributes::FeatureMap::Get(kRootEndpointId, &featureMap) == EMBER_ZCL_STATUS_SUCCESS);
	return success ? ((featureMap & to_underlying(feature)) != 0) : false;
	#else
	return ((mFeatureMap & to_underlying(feature)) != 0);
	#endif // !CONFIG_BUILD_FOR_HOST_UNIT_TEST
	}

	void ICDManager::SendCheckInMsgs()
	{
	#if !CONFIG_BUILD_FOR_HOST_UNIT_TEST
	VerifyOrDie(mStorage != nullptr);
	VerifyOrDie(mFabricTable != nullptr);

	uint32_t counterValue = ICDConfigurationData::GetInstance().GetICDCounter().GetNextCheckInCounterValue();
	bool counterIncremented = false;

	for (const auto & fabricInfo : *mFabricTable)
	{
	uint16_t supported_clients = ICDConfigurationData::GetInstance().GetClientsSupportedPerFabric();

	ICDMonitoringTable table(mStorage, fabricInfo.GetFabricIndex(), supported_clients /Table entry limit*/,
	mSymmetricKeystore);
	if (table.IsEmpty())
	{
	continue;
	}

	for (uint16_t i = 0; i < table.Limit(); i++)
	{
	ICDMonitoringEntry entry(mSymmetricKeystore);
	CHIP_ERROR err = table.Get(i, entry);
	if (err == CHIP_ERROR_NOT_FOUND)
	{
	break;
	}

	if (err != CHIP_NO_ERROR)
	{
	// Try to fetch the next entry upon failure (should not happen).
	ChipLogError(AppServer, "Failed to retrieved ICDMonitoring entry for Check-In msg, will try next entry.");
	continue;
	}

	bool active = mSubManager->SubjectHasActiveSubscription(entry.fabricIndex, entry.monitoredSubject);
	if (active)
	{
	continue;
	}

	// Increment counter only once to prevent depletion of the available range.
	if (!counterIncremented)
	{
	counterIncremented = true;

	if (CHIP_NO_ERROR != ICDConfigurationData::GetInstance().GetICDCounter().Advance())
	{
	ChipLogError(AppServer, "Incremented ICDCounter but failed to access/save to Persistent storage");
	}
	}

	// SenderPool will be released upon transition from active to idle state
	// This will happen when all ICD Check-In messages are sent on the network
	ICDCheckInSender * sender = mICDSenderPool.CreateObject(mExchangeManager);
	VerifyOrReturn(sender != nullptr, ChipLogError(AppServer, "Failed to allocate ICDCheckinSender"));

	if (CHIP_NO_ERROR != sender->RequestResolve(entry, mFabricTable, counterValue))
	{
	ChipLogError(AppServer, "Failed to send ICD Check-In");
	}
	}
	}
	#endif // CONFIG_BUILD_FOR_HOST_UNIT_TEST
	}

	void ICDManager::UpdateICDMode()
	{
	assertChipStackLockedByCurrentThread();

	ICDConfigurationData::ICDMode tempMode = ICDConfigurationData::ICDMode::SIT;

	// Device can only switch to the LIT operating mode if LIT support is present
	if (SupportsFeature(Feature::kLongIdleTimeSupport))
	{
	VerifyOrDie(mStorage != nullptr);
	VerifyOrDie(mFabricTable != nullptr);
	// We can only get to LIT Mode, if at least one client is registered with the ICD device
	for (const auto & fabricInfo : *mFabricTable)
	{
	// We only need 1 valid entry to ensure LIT compliance
	ICDMonitoringTable table(mStorage, fabricInfo.GetFabricIndex(), 1 /Table entry limit*/, mSymmetricKeystore);
	if (!table.IsEmpty())
	{
	tempMode = ICDConfigurationData::ICDMode::LIT;
	break;
	}
	}
	}

	if (ICDConfigurationData::GetInstance().GetICDMode() != tempMode)
	{
	ICDConfigurationData::GetInstance().SetICDMode(tempMode);
	postObserverEvent(ObserverEventType::ICDModeChange);

	// Can't use attribute accessors/Attributes::OperatingMode::Set in unit tests
	#if !CONFIG_BUILD_FOR_HOST_UNIT_TEST
	Attributes::OperatingMode::Set(kRootEndpointId, static_cast<OperatingModeEnum>(tempMode));
	#endif
	}

	// When in SIT mode, the slow poll interval SHOULDN'T be greater than the SIT mode polling threshold, per spec.
	if (ICDConfigurationData::GetInstance().GetICDMode() == ICDConfigurationData::ICDMode::SIT &&
	ICDConfigurationData::GetInstance().GetSlowPollingInterval() > ICDConfigurationData::GetInstance().GetSITPollingThreshold())
	{
	ChipLogDetail(AppServer, "The Slow Polling Interval of an ICD in SIT mode should be <= %" PRIu32 " seconds",
	(ICDConfigurationData::GetInstance().GetSITPollingThreshold().count() / 1000));
	}
	}

	void ICDManager::UpdateOperationState(OperationalState state)
	{
	assertChipStackLockedByCurrentThread();
	// Active mode can be re-triggered.
	VerifyOrReturn(mOperationalState != state \|\| state == OperationalState::ActiveMode);

	if (state == OperationalState::IdleMode)
	{
	mOperationalState = OperationalState::IdleMode;

	// When the active mode interval is 0, we stay in idleMode until a notification brings the icd into active mode
	// unless the device would need to send Check-In messages
	// TODO(#30281) : Verify how persistent subscriptions affects this at ICDManager::Init
	if (ICDConfigurationData::GetInstance().GetActiveModeDuration() > kZero \|\| CheckInMessagesWouldBeSent())
	{
	DeviceLayer::SystemLayer().StartTimer(ICDConfigurationData::GetInstance().GetIdleModeDuration(), OnIdleModeDone, this);
	}

	Milliseconds32 slowPollInterval = ICDConfigurationData::GetInstance().GetSlowPollingInterval();

	// Going back to Idle, all Check-In messages are sent
	mICDSenderPool.ReleaseAll();

	CHIP_ERROR err = DeviceLayer::ConnectivityMgr().SetPollingInterval(slowPollInterval);
	if (err != CHIP_NO_ERROR)
	{
	ChipLogError(AppServer, "Failed to set Slow Polling Interval: err %" CHIP_ERROR_FORMAT, err.Format());
	}
	}
	else if (state == OperationalState::ActiveMode)
	{
	if (mOperationalState == OperationalState::IdleMode)
	{
	// An event could have brought us to the active mode.
	// Make sure the idle mode timer is stopped
	DeviceLayer::SystemLayer().CancelTimer(OnIdleModeDone, this);

	mOperationalState = OperationalState::ActiveMode;
	Milliseconds32 activeModeDuration = ICDConfigurationData::GetInstance().GetActiveModeDuration();

	if (activeModeDuration == kZero && !mKeepActiveFlags.HasAny())
	{
	// A Network Activity triggered the active mode and activeModeDuration is 0.
	// Stay active for at least Active Mode Threshold.
	activeModeDuration = ICDConfigurationData::GetInstance().GetActiveModeThreshold();
	}

	DeviceLayer::SystemLayer().StartTimer(activeModeDuration, OnActiveModeDone, this);

	Milliseconds32 activeModeJitterInterval = Milliseconds32(ICD_ACTIVE_TIME_JITTER_MS);
	activeModeJitterInterval =
	(activeModeDuration >= activeModeJitterInterval) ? activeModeDuration - activeModeJitterInterval : kZero;

	DeviceLayer::SystemLayer().StartTimer(activeModeJitterInterval, OnTransitionToIdle, this);

	CHIP_ERROR err =
	DeviceLayer::ConnectivityMgr().SetPollingInterval(ICDConfigurationData::GetInstance().GetFastPollingInterval());
	if (err != CHIP_NO_ERROR)
	{
	ChipLogError(AppServer, "Failed to set Fast Polling Interval: err %" CHIP_ERROR_FORMAT, err.Format());
	}

	if (SupportsFeature(Feature::kCheckInProtocolSupport))
	{
	SendCheckInMsgs();
	}

	postObserverEvent(ObserverEventType::EnterActiveMode);
	}
	else
	{
	Milliseconds16 activeModeThreshold = ICDConfigurationData::GetInstance().GetActiveModeThreshold();
	DeviceLayer::SystemLayer().ExtendTimerTo(activeModeThreshold, OnActiveModeDone, this);

	Milliseconds32 activeModeJitterThreshold = Milliseconds32(ICD_ACTIVE_TIME_JITTER_MS);
	activeModeJitterThreshold =
	(activeModeThreshold >= activeModeJitterThreshold) ? activeModeThreshold - activeModeJitterThreshold : kZero;

	if (!mTransitionToIdleCalled)
	{
	DeviceLayer::SystemLayer().ExtendTimerTo(activeModeJitterThreshold, OnTransitionToIdle, this);
	}
	}
	}
	}

	void ICDManager::SetKeepActiveModeRequirements(KeepActiveFlags flag, bool state)
	{
	assertChipStackLockedByCurrentThread();

	mKeepActiveFlags.Set(flag, state);
	if (mOperationalState == OperationalState::IdleMode && mKeepActiveFlags.HasAny())
	{
	UpdateOperationState(OperationalState::ActiveMode);
	}
	else if (mOperationalState == OperationalState::ActiveMode && !mKeepActiveFlags.HasAny() &&
	!DeviceLayer::SystemLayer().IsTimerActive(OnActiveModeDone, this))
	{
	// The normal active period had ended and nothing else requires the system to be active.
	UpdateOperationState(OperationalState::IdleMode);
	}
	}

	void ICDManager::OnIdleModeDone(System::Layer * aLayer, void * appState)
	{
	ICDManager * pICDManager = reinterpret_cast<ICDManager *>(appState);
	pICDManager->UpdateOperationState(OperationalState::ActiveMode);

	// We only reset this flag when idle mode is complete to avoid re-triggering the check when an event brings us back to active,
	// which could cause a loop.
	pICDManager->mTransitionToIdleCalled = false;
	}

	void ICDManager::OnActiveModeDone(System::Layer * aLayer, void * appState)
	{
	ICDManager * pICDManager = reinterpret_cast<ICDManager *>(appState);

	// Don't go to idle mode when we have a keep active requirement
	if (!pICDManager->mKeepActiveFlags.HasAny())
	{
	pICDManager->UpdateOperationState(OperationalState::IdleMode);
	}
	}

	void ICDManager::OnTransitionToIdle(System::Layer * aLayer, void * appState)
	{
	ICDManager * pICDManager = reinterpret_cast<ICDManager *>(appState);

	// OnTransitionToIdle will trigger a report message if reporting is needed, which should extend the active mode until the
	// ack for the report is received.
	pICDManager->mTransitionToIdleCalled = true;
	pICDManager->postObserverEvent(ObserverEventType::TransitionToIdle);
	}

	/* ICDListener functions. */
	void ICDManager::OnKeepActiveRequest(KeepActiveFlags request)
	{
	assertChipStackLockedByCurrentThread();

	VerifyOrReturn(request < KeepActiveFlagsValues::kInvalidFlag);

	if (request.Has(KeepActiveFlag::kExchangeContextOpen))
	{
	// There can be multiple open exchange contexts at the same time.
	// Keep track of the requests count.
	this->mOpenExchangeContextCount++;
	}

	if (request.Has(KeepActiveFlag::kCheckInInProgress))
	{
	// There can be multiple check-in at the same time.
	// Keep track of the requests count.
	this->mCheckInRequestCount++;
	}

	this->SetKeepActiveModeRequirements(request, true /* state */);
	}

	void ICDManager::OnActiveRequestWithdrawal(KeepActiveFlags request)
	{
	assertChipStackLockedByCurrentThread();

	VerifyOrReturn(request < KeepActiveFlagsValues::kInvalidFlag);

	if (request.Has(KeepActiveFlag::kExchangeContextOpen))
	{
	// There can be multiple open exchange contexts at the same time.
	// Keep track of the requests count.
	if (this->mOpenExchangeContextCount > 0)
	{
	this->mOpenExchangeContextCount--;
	}
	else
	{
	ChipLogError(DeviceLayer, "The ICD Manager did not account for ExchangeContext closure");
	}

	if (this->mOpenExchangeContextCount == 0)
	{
	this->SetKeepActiveModeRequirements(KeepActiveFlag::kExchangeContextOpen, false /* state */);
	}
	}

	if (request.Has(KeepActiveFlag::kCheckInInProgress))
	{
	// There can be multiple open exchange contexts at the same time.
	// Keep track of the requests count.
	if (this->mCheckInRequestCount > 0)
	{
	this->mCheckInRequestCount--;
	}
	else
	{
	ChipLogError(DeviceLayer, "The ICD Manager did not account for Check-In Sender start");
	}

	if (this->mCheckInRequestCount == 0)
	{
	this->SetKeepActiveModeRequirements(KeepActiveFlag::kCheckInInProgress, false /* state */);
	}
	}

	if (request.Has(KeepActiveFlag::kCommissioningWindowOpen) \|\| request.Has(KeepActiveFlag::kFailSafeArmed))
	{
	// Only 1 request per type (kCommissioningWindowOpen, kFailSafeArmed)
	// remove requirement directly
	this->SetKeepActiveModeRequirements(request, false /* state */);
	}
	}

	void ICDManager::OnNetworkActivity()
	{
	this->UpdateOperationState(OperationalState::ActiveMode);
	}

	void ICDManager::OnICDManagementServerEvent(ICDManagementEvents event)
	{
	switch (event)
	{
	case ICDManagementEvents::kTableUpdated:
	this->UpdateICDMode();
	break;

	case ICDManagementEvents::kStayActiveRequestReceived:
	// TODO : Implement the StayActiveRequest
	// https://github.com/project-chip/connectedhomeip/issues/24259
	break;
	default:
	break;
	}
	}

	void ICDManager::OnSubscriptionReport()
	{
	// If the device is already in ActiveMode, that means that all active subscriptions have already been marked dirty.
	// Since we only mark them dirty when we enter ActiveMode, it is not necessary to update the operational state a second time.
	// Doing so will only add an ActiveModeThreshold to the active time which we don't want to do here.
	VerifyOrReturn(mOperationalState == OperationalState::IdleMode);
	this->UpdateOperationState(OperationalState::ActiveMode);
	}

	ICDManager::ObserverPointer * ICDManager::RegisterObserver(ICDStateObserver * observer)
	{
	return mStateObserverPool.CreateObject(observer);
	}

	void ICDManager::ReleaseObserver(ICDStateObserver * observer)
	{
	mStateObserverPool.ForEachActiveObject([this, observer](ObserverPointer * obs) {
	if (obs->mObserver == observer)
	{
	mStateObserverPool.ReleaseObject(obs);
	return Loop::Break;
	}
	return Loop::Continue;
	});
	}

	void ICDManager::postObserverEvent(ObserverEventType event)
	{
	mStateObserverPool.ForEachActiveObject([event](ObserverPointer * obs) {
	switch (event)
	{
	case ObserverEventType::EnterActiveMode: {
	obs->mObserver->OnEnterActiveMode();
	return Loop::Continue;
	}
	case ObserverEventType::TransitionToIdle: {
	obs->mObserver->OnTransitionToIdle();
	return Loop::Continue;
	}
	case ObserverEventType::ICDModeChange: {
	obs->mObserver->OnICDModeChange();
	return Loop::Continue;
	}
	default: {
	ChipLogError(DeviceLayer, "Invalid ICD Observer event type");
	return Loop::Break;
	}
	}
	});
	}

	bool ICDManager::CheckInMessagesWouldBeSent()
	{
	for (const auto & fabricInfo : *mFabricTable)
	{
	uint16_t supported_clients = ICDConfigurationData::GetInstance().GetClientsSupportedPerFabric();

	ICDMonitoringTable table(mStorage, fabricInfo.GetFabricIndex(), supported_clients /Table entry limit*/,
	mSymmetricKeystore);
	if (table.IsEmpty())
	{
	continue;
	}

	for (uint16_t i = 0; i < table.Limit(); i++)
	{
	ICDMonitoringEntry entry(mSymmetricKeystore);
	CHIP_ERROR err = table.Get(i, entry);
	if (err == CHIP_ERROR_NOT_FOUND)
	{
	break;
	}

	if (err != CHIP_NO_ERROR)
	{
	// Try to fetch the next entry upon failure (should not happen).
	ChipLogError(AppServer, "Failed to retrieved ICDMonitoring entry, will try next entry.");
	continue;
	}

	// At least one registration would require a Check-In message
	VerifyOrReturnValue(mSubManager->SubjectHasActiveSubscription(entry.fabricIndex, entry.monitoredSubject), true);
	}
	}

	// None of the registrations would require a Check-In message
	return false;
	}

	void ICDManager::TriggerCheckInMessages()
	{
	VerifyOrReturn(SupportsFeature(Feature::kCheckInProtocolSupport));

	// Only trigger Check-In messages when we are in IdleMode.
	// If we are already in ActiveMode, Check-In messages have already been sent.
	VerifyOrReturn(mOperationalState == OperationalState::IdleMode);

	// If we don't have any Check-In messages to send, do nothing
	VerifyOrReturn(CheckInMessagesWouldBeSent());

	UpdateOperationState(OperationalState::ActiveMode);
	}

	} // namespace app
	} // namespace chip