src/app/clusters/mode-base-server/mode-base-server.cpp - third_party/github/project-chip/connectedhomeip - Git at Google

 /*
  *
  *    Copyright (c) 2023 Project CHIP Authors
  *    All rights reserved.
  *
  *    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/AttributeAccessInterfaceRegistry.h>
 #include <app/InteractionModelEngine.h>
 #include <app/SafeAttributePersistenceProvider.h>
 #include <app/clusters/mode-base-server/mode-base-server.h>
 #include <app/clusters/on-off-server/on-off-server.h>
 #include <app/reporting/reporting.h>
 #include <app/util/attribute-storage.h>
 #include <platform/DiagnosticDataProvider.h>
 #include <tracing/macros.h>

 using namespace chip;
 using namespace chip::app;
 using namespace chip::app::Clusters;
 using chip::Protocols::InteractionModel::Status;
 using BootReasonType       = GeneralDiagnostics::BootReasonEnum;
 using ModeOptionStructType = chip::app::Clusters::detail::Structs::ModeOptionStruct::Type;
 using ModeTagStructType    = chip::app::Clusters::detail::Structs::ModeTagStruct::Type;

 namespace chip {
 namespace app {
 namespace Clusters {
 namespace ModeBase {

 Instance::Instance(Delegate * aDelegate, EndpointId aEndpointId, ClusterId aClusterId, uint32_t aFeature) :
     CommandHandlerInterface(Optional<EndpointId>(aEndpointId), aClusterId),
     AttributeAccessInterface(Optional<EndpointId>(aEndpointId), aClusterId), mDelegate(aDelegate), mEndpointId(aEndpointId),
     mClusterId(aClusterId),
     mCurrentMode(0), // This is a temporary value and may not be valid. We will change this to the value of the first
                      // mode in the list at the start of the Init function to ensure that it represents a valid mode.
     mFeature(aFeature)
 {
     mDelegate->SetInstance(this);
 }

 Instance::~Instance()
 {
     Shutdown();
 }

 void Instance::Shutdown()
 {
     if (!IsInList())
     {
         return;
     }
     UnregisterThisInstance();
     chip::app::InteractionModelEngine::GetInstance()->UnregisterCommandHandler(this);
     unregisterAttributeAccessOverride(this);
 }

 CHIP_ERROR Instance::Init()
 {
     // Initialise the current mode with the value of the first mode. This ensures that it is representing a valid mode.
     ReturnErrorOnFailure(mDelegate->GetModeValueByIndex(0, mCurrentMode));

     // Check if the cluster has been selected in zap
     VerifyOrDie(emberAfContainsServer(mEndpointId, mClusterId) == true);

     LoadPersistentAttributes();

     ReturnErrorOnFailure(chip::app::InteractionModelEngine::GetInstance()->RegisterCommandHandler(this));
     VerifyOrReturnError(registerAttributeAccessOverride(this), CHIP_ERROR_INCORRECT_STATE);
     RegisterThisInstance();
     ReturnErrorOnFailure(mDelegate->Init());

     // If the StartUpMode is set, the CurrentMode attribute SHALL be set to the StartUpMode value, when the server is powered up.
     if (!mStartUpMode.IsNull())
     {
         // This behavior does not apply to reboots associated with OTA.
         // After an OTA restart, the CurrentMode attribute SHALL return to its value prior to the restart.
         // todo this only works for matter OTAs. According to the spec, this should also work for general OTAs.
         BootReasonType bootReason = BootReasonType::kUnspecified;
         CHIP_ERROR error          = DeviceLayer::GetDiagnosticDataProvider().GetBootReason(bootReason);

         if (error != CHIP_NO_ERROR)
         {
             ChipLogError(
                 Zcl, "Unable to retrieve boot reason: %" CHIP_ERROR_FORMAT ". Assuming that we did not reboot because of an OTA",
                 error.Format());
             bootReason = BootReasonType::kUnspecified;
         }

         if (bootReason == BootReasonType::kSoftwareUpdateCompleted)
         {
             ChipLogDetail(Zcl, "ModeBase: StartUpMode is ignored for OTA reboot.");
         }
         else
         {
             // Set CurrentMode to StartUpMode
             if (mStartUpMode.Value() != mCurrentMode)
             {
                 ChipLogProgress(Zcl, "ModeBase: Changing CurrentMode to the StartUpMode value.");
                 Status status = UpdateCurrentMode(mStartUpMode.Value());
                 if (status != Status::Success)
                 {
                     ChipLogError(Zcl, "ModeBase: Failed to change the CurrentMode to the StartUpMode value: %u",
                                  to_underlying(status));
                     return StatusIB(status).ToChipError();
                 }

                 ChipLogProgress(Zcl, "ModeBase: Successfully initialized CurrentMode to the StartUpMode value %u",
                                 mStartUpMode.Value());
             }
         }
     }

 #ifdef MATTER_DM_PLUGIN_ON_OFF_SERVER
     // OnMode with Power Up
     // If the On/Off feature is supported and the On/Off cluster attribute StartUpOnOff is present, with a
     // value of On (turn on at power up), then the CurrentMode attribute SHALL be set to the OnMode attribute
     // value when the server is supplied with power, except if the OnMode attribute is null.
     if (emberAfContainsServer(mEndpointId, OnOff::Id) &&
         emberAfContainsAttribute(mEndpointId, OnOff::Id, OnOff::Attributes::StartUpOnOff::Id) &&
         emberAfContainsAttribute(mEndpointId, mClusterId, ModeBase::Attributes::OnMode::Id) &&
         HasFeature(ModeBase::Feature::kOnOff))
     {
         DataModel::Nullable<uint8_t> onMode = GetOnMode();
         bool onOffValueForStartUp           = false;
         if (!emberAfIsKnownVolatileAttribute(mEndpointId, OnOff::Id, OnOff::Attributes::StartUpOnOff::Id) &&
             OnOffServer::Instance().getOnOffValueForStartUp(mEndpointId, onOffValueForStartUp) == Status::Success)
         {
             if (onOffValueForStartUp && !onMode.IsNull())
             {
                 // Set CurrentMode to OnMode
                 if (mOnMode.Value() != mCurrentMode)
                 {
                     ChipLogProgress(Zcl, "ModeBase: Changing CurrentMode to the OnMode value.");
                     Status status = UpdateCurrentMode(mOnMode.Value());
                     if (status != Status::Success)
                     {
                         ChipLogError(Zcl, "ModeBase: Failed to change the CurrentMode to the OnMode value: %u",
                                      to_underlying(status));
                         return StatusIB(status).ToChipError();
                     }

                     ChipLogProgress(Zcl, "ModeBase: Successfully initialized CurrentMode to the OnMode value %u", mOnMode.Value());
                 }
             }
         }
     }
 #endif // MATTER_DM_PLUGIN_ON_OFF_SERVER

     return CHIP_NO_ERROR;
 }

 Status Instance::UpdateCurrentMode(uint8_t aNewMode)
 {
     if (!IsSupportedMode(aNewMode))
     {
         return Protocols::InteractionModel::Status::ConstraintError;
     }
     uint8_t oldMode = mCurrentMode;
     mCurrentMode    = aNewMode;
     if (mCurrentMode != oldMode)
     {
         // Write new value to persistent storage.
         ConcreteAttributePath path = ConcreteAttributePath(mEndpointId, mClusterId, Attributes::CurrentMode::Id);
         GetSafeAttributePersistenceProvider()->WriteScalarValue(path, mCurrentMode);
         MatterReportingAttributeChangeCallback(path);
     }
     return Protocols::InteractionModel::Status::Success;
 }

 Status Instance::UpdateStartUpMode(DataModel::Nullable<uint8_t> aNewStartUpMode)
 {
     if (!aNewStartUpMode.IsNull())
     {
         if (!IsSupportedMode(aNewStartUpMode.Value()))
         {
             return Protocols::InteractionModel::Status::ConstraintError;
         }
     }
     DataModel::Nullable<uint8_t> oldStartUpMode = mStartUpMode;
     mStartUpMode                                = aNewStartUpMode;
     if (mStartUpMode != oldStartUpMode)
     {
         // Write new value to persistent storage.
         ConcreteAttributePath path = ConcreteAttributePath(mEndpointId, mClusterId, Attributes::StartUpMode::Id);
         GetSafeAttributePersistenceProvider()->WriteScalarValue(path, mStartUpMode);
         MatterReportingAttributeChangeCallback(path);
     }
     return Protocols::InteractionModel::Status::Success;
 }

 Status Instance::UpdateOnMode(DataModel::Nullable<uint8_t> aNewOnMode)
 {
     if (!aNewOnMode.IsNull())
     {
         if (!IsSupportedMode(aNewOnMode.Value()))
         {
             return Protocols::InteractionModel::Status::ConstraintError;
         }
     }
     DataModel::Nullable<uint8_t> oldOnMode = mOnMode;
     mOnMode                                = aNewOnMode;
     if (mOnMode != oldOnMode)
     {
         // Write new value to persistent storage.
         ConcreteAttributePath path = ConcreteAttributePath(mEndpointId, mClusterId, Attributes::OnMode::Id);
         GetSafeAttributePersistenceProvider()->WriteScalarValue(path, mOnMode);
         MatterReportingAttributeChangeCallback(path);
     }
     return Protocols::InteractionModel::Status::Success;
 }

 uint8_t Instance::GetCurrentMode() const
 {
     return mCurrentMode;
 }

 DataModel::Nullable<uint8_t> Instance::GetStartUpMode() const
 {
     return mStartUpMode;
 }

 DataModel::Nullable<uint8_t> Instance::GetOnMode() const
 {
     return mOnMode;
 }

 void Instance::ReportSupportedModesChange()
 {
     MatterReportingAttributeChangeCallback(ConcreteAttributePath(mEndpointId, mClusterId, Attributes::SupportedModes::Id));
 }

 bool Instance::HasFeature(Feature feature) const
 {
     return (mFeature & to_underlying(feature)) != 0;
 }

 bool Instance::IsSupportedMode(uint8_t modeValue)
 {
     uint8_t value;
     for (uint8_t i = 0; mDelegate->GetModeValueByIndex(i, value) != CHIP_ERROR_PROVIDER_LIST_EXHAUSTED; i++)
     {
         if (value == modeValue)
         {
             return true;
         }
     }
     ChipLogDetail(Zcl, "Cannot find a mode with value %u", modeValue);
     return false;
 }

 CHIP_ERROR Instance::GetModeValueByModeTag(uint16_t modeTagValue, uint8_t & value)
 {
     ModeTagStructType tagsBuffer[kMaxNumOfModeTags];
     DataModel::List<ModeTagStructType> mTags(tagsBuffer);
     for (uint8_t i = 0; mDelegate->GetModeTagsByIndex(i, mTags) != CHIP_ERROR_PROVIDER_LIST_EXHAUSTED; i++)
     {
         for (size_t ii = 0; ii < mTags.size(); ii++)
         {
             if (mTags[ii].value == modeTagValue)
             {
                 mDelegate->GetModeValueByIndex(i, value);
                 return CHIP_NO_ERROR;
             }
         }
         mTags = tagsBuffer;
     }
     ChipLogDetail(Zcl, "Cannot find a mode with mode tag %x", modeTagValue);
     return CHIP_ERROR_PROVIDER_LIST_EXHAUSTED;
 }

 // private methods
 template <typename RequestT, typename FuncT>
 void Instance::HandleCommand(HandlerContext & handlerContext, FuncT func)
 {
     if (!handlerContext.mCommandHandled && (handlerContext.mRequestPath.mCommandId == RequestT::GetCommandId()))
     {
         RequestT requestPayload;

         // If the command matches what the caller is looking for, let's mark this as being handled
         // even if errors happen after this. This ensures that we don't execute any fall-back strategies
         // to handle this command since at this point, the caller is taking responsibility for handling
         // the command in its entirety, warts and all.
         //
         handlerContext.SetCommandHandled();

         if (DataModel::Decode(handlerContext.mPayload, requestPayload) != CHIP_NO_ERROR)
         {
             handlerContext.mCommandHandler.AddStatus(handlerContext.mRequestPath,
                                                      Protocols::InteractionModel::Status::InvalidCommand);
             return;
         }

         func(handlerContext, requestPayload);
     }
 }

 // This function is called by the interaction model engine when a command destined for this instance is received.
 void Instance::InvokeCommand(HandlerContext & handlerContext)
 {
     switch (handlerContext.mRequestPath.mCommandId)
     {
     case ModeBase::Commands::ChangeToMode::Id:
         ChipLogDetail(Zcl, "ModeBase: Entering handling ChangeToModeWithStatus");

         HandleCommand<Commands::ChangeToMode::DecodableType>(
             handlerContext, [this](HandlerContext & ctx, const auto & commandData) { HandleChangeToMode(ctx, commandData); });
     }
 }

 // Implements the read functionality for complex attributes.
 CHIP_ERROR Instance::Read(const ConcreteReadAttributePath & aPath, AttributeValueEncoder & aEncoder)
 {
     switch (aPath.mAttributeId)
     {
     case Attributes::CurrentMode::Id:
         ReturnErrorOnFailure(aEncoder.Encode(mCurrentMode));
         break;
     case Attributes::StartUpMode::Id:
         ReturnErrorOnFailure(aEncoder.Encode(mStartUpMode));
         break;
     case Attributes::OnMode::Id:
         ReturnErrorOnFailure(aEncoder.Encode(mOnMode));
         break;
     case Attributes::FeatureMap::Id:
         ReturnErrorOnFailure(aEncoder.Encode(mFeature));
         break;
     case Attributes::SupportedModes::Id:
         Instance * d   = this;
         CHIP_ERROR err = aEncoder.EncodeList([d](const auto & encoder) -> CHIP_ERROR { return d->EncodeSupportedModes(encoder); });
         return err;
     }
     return CHIP_NO_ERROR;
 }

 // Implements checking before attribute writes.
 CHIP_ERROR Instance::Write(const ConcreteDataAttributePath & attributePath, AttributeValueDecoder & aDecoder)
 {
     DataModel::Nullable<uint8_t> newMode;
     ReturnErrorOnFailure(aDecoder.Decode(newMode));
     Status status;

     switch (attributePath.mAttributeId)
     {
     case ModeBase::Attributes::StartUpMode::Id:
         status = UpdateStartUpMode(newMode);
         return StatusIB(status).ToChipError();
     case ModeBase::Attributes::OnMode::Id:
         status = UpdateOnMode(newMode);
         return StatusIB(status).ToChipError();
     }

     return CHIP_ERROR_INCORRECT_STATE;
 }

 void Instance::RegisterThisInstance()
 {
     if (!gModeBaseAliasesInstances.Contains(this))
     {
         gModeBaseAliasesInstances.PushBack(this);
     }
 }

 void Instance::UnregisterThisInstance()
 {
     gModeBaseAliasesInstances.Remove(this);
 }

 void Instance::HandleChangeToMode(HandlerContext & ctx, const Commands::ChangeToMode::DecodableType & commandData)
 {
     MATTER_TRACE_SCOPE("ChangeToMode", "ModeBase");
     uint8_t newMode = commandData.newMode;

     Commands::ChangeToModeResponse::Type response;

     // If the NewMode field doesn't match the Mode field of any entry of the SupportedModes list,
     // the ChangeToModeResponse command's Status field SHALL indicate UnsupportedMode and
     // the StatusText field SHALL be included and MAY be used to indicate the issue, with a human readable string,
     // or include an empty string.
     // We are leaving the StatusText empty since the Status is descriptive enough.
     if (!IsSupportedMode(newMode))
     {
         ChipLogError(Zcl, "ModeBase: Failed to find the option with mode %u", newMode);
         response.status = to_underlying(StatusCode::kUnsupportedMode);
         ctx.mCommandHandler.AddResponse(ctx.mRequestPath, response);
         return;
     }

     // If the NewMode field is the same as the value of the CurrentMode attribute
     // the ChangeToModeResponse command SHALL have the Status field set to Success and
     // the StatusText field MAY be supplied with a human readable string or include an empty string.
     // We are leaving the StatusText empty since the Status is descriptive enough.
     if (newMode == GetCurrentMode())
     {
         response.status = to_underlying(ModeBase::StatusCode::kSuccess);
         ctx.mCommandHandler.AddResponse(ctx.mRequestPath, response);
         return;
     }

     mDelegate->HandleChangeToMode(newMode, response);

     if (response.status == to_underlying(StatusCode::kSuccess))
     {
         UpdateCurrentMode(newMode);
         ChipLogProgress(Zcl, "ModeBase: HandleChangeToMode changed to mode %u", newMode);
     }

     ctx.mCommandHandler.AddResponse(ctx.mRequestPath, response);
 }

 void Instance::LoadPersistentAttributes()
 {
     // Load Current Mode
     uint8_t tempCurrentMode;
     CHIP_ERROR err = GetSafeAttributePersistenceProvider()->ReadScalarValue(
         ConcreteAttributePath(mEndpointId, mClusterId, Attributes::CurrentMode::Id), tempCurrentMode);
     if (err == CHIP_NO_ERROR)
     {
         Status status = UpdateCurrentMode(tempCurrentMode);
         if (status == Status::Success)
         {
             ChipLogDetail(Zcl, "ModeBase: Loaded CurrentMode as %u", GetCurrentMode());
         }
         else
         {
             ChipLogError(Zcl, "ModeBase: Could not update CurrentMode to %u: %u", tempCurrentMode, to_underlying(status));
         }
     }
     else
     {
         // If we cannot find the previous CurrentMode, we will assume it to be the first mode in the
         // list, as was initialised in the constructor.
         ChipLogDetail(Zcl, "ModeBase: Unable to load the CurrentMode from the KVS. Assuming %u", GetCurrentMode());
     }

     // Load Start-Up Mode
     DataModel::Nullable<uint8_t> tempStartUpMode;
     err = GetSafeAttributePersistenceProvider()->ReadScalarValue(
         ConcreteAttributePath(mEndpointId, mClusterId, Attributes::StartUpMode::Id), tempStartUpMode);
     if (err == CHIP_NO_ERROR)
     {
         Status status = UpdateStartUpMode(tempStartUpMode);
         if (status == Status::Success)
         {
             if (GetStartUpMode().IsNull())
             {
                 ChipLogDetail(Zcl, "ModeBase: Loaded StartUpMode as null");
             }
             else
             {
                 ChipLogDetail(Zcl, "ModeBase: Loaded StartUpMode as %u", GetStartUpMode().Value());
             }
         }
         else
         {
             ChipLogError(Zcl, "ModeBase: Could not update StartUpMode: %u", to_underlying(status));
         }
     }
     else
     {
         ChipLogDetail(Zcl, "ModeBase: Unable to load the StartUpMode from the KVS. Assuming null");
     }

     // Load On Mode
     DataModel::Nullable<uint8_t> tempOnMode;
     err = GetSafeAttributePersistenceProvider()->ReadScalarValue(
         ConcreteAttributePath(mEndpointId, mClusterId, Attributes::OnMode::Id), tempOnMode);
     if (err == CHIP_NO_ERROR)
     {
         Status status = UpdateOnMode(tempOnMode);
         if (status == Status::Success)
         {
             if (GetOnMode().IsNull())
             {
                 ChipLogDetail(Zcl, "ModeBase: Loaded OnMode as null");
             }
             else
             {
                 ChipLogDetail(Zcl, "ModeBase: Loaded OnMode as %u", GetOnMode().Value());
             }
         }
         else
         {
             ChipLogError(Zcl, "ModeBase: Could not update OnMode: %u", to_underlying(status));
         }
     }
     else
     {
         ChipLogDetail(Zcl, "ModeBase: Unable to load the OnMode from the KVS.      Assuming null");
     }
 }

 CHIP_ERROR Instance::EncodeSupportedModes(const AttributeValueEncoder::ListEncodeHelper & encoder)
 {
     for (uint8_t i = 0; true; i++)
     {
         ModeOptionStructType mode;

         // Get the mode label
         char buffer[kMaxModeLabelSize];
         MutableCharSpan label(buffer);
         auto err = mDelegate->GetModeLabelByIndex(i, label);
         if (err == CHIP_ERROR_PROVIDER_LIST_EXHAUSTED)
         {
             return CHIP_NO_ERROR;
         }
         ReturnErrorOnFailure(err);

         mode.label = label;

         // Get the mode value
         ReturnErrorOnFailure(mDelegate->GetModeValueByIndex(i, mode.mode));

         // Get the mode tags
         ModeTagStructType tagsBuffer[kMaxNumOfModeTags];
         DataModel::List<ModeTagStructType> tags(tagsBuffer);
         ReturnErrorOnFailure(mDelegate->GetModeTagsByIndex(i, tags));
         mode.modeTags = tags;

         ReturnErrorOnFailure(encoder.Encode(mode));
     }
     return CHIP_NO_ERROR;
 }

 IntrusiveList<Instance> & GetModeBaseInstanceList()
 {
     return gModeBaseAliasesInstances;
 }

 } // namespace ModeBase
 } // namespace Clusters
 } // namespace app
 } // namespace chip
	/*
	*
	* Copyright (c) 2023 Project CHIP Authors
	* All rights reserved.
	*
	* 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/AttributeAccessInterfaceRegistry.h>
	#include <app/InteractionModelEngine.h>
	#include <app/SafeAttributePersistenceProvider.h>
	#include <app/clusters/mode-base-server/mode-base-server.h>
	#include <app/clusters/on-off-server/on-off-server.h>
	#include <app/reporting/reporting.h>
	#include <app/util/attribute-storage.h>
	#include <platform/DiagnosticDataProvider.h>
	#include <tracing/macros.h>

	using namespace chip;
	using namespace chip::app;
	using namespace chip::app::Clusters;
	using chip::Protocols::InteractionModel::Status;
	using BootReasonType = GeneralDiagnostics::BootReasonEnum;
	using ModeOptionStructType = chip::app::Clusters::detail::Structs::ModeOptionStruct::Type;
	using ModeTagStructType = chip::app::Clusters::detail::Structs::ModeTagStruct::Type;

	namespace chip {
	namespace app {
	namespace Clusters {
	namespace ModeBase {

	Instance::Instance(Delegate * aDelegate, EndpointId aEndpointId, ClusterId aClusterId, uint32_t aFeature) :
	CommandHandlerInterface(Optional<EndpointId>(aEndpointId), aClusterId),
	AttributeAccessInterface(Optional<EndpointId>(aEndpointId), aClusterId), mDelegate(aDelegate), mEndpointId(aEndpointId),
	mClusterId(aClusterId),
	mCurrentMode(0), // This is a temporary value and may not be valid. We will change this to the value of the first
	// mode in the list at the start of the Init function to ensure that it represents a valid mode.
	mFeature(aFeature)
	{
	mDelegate->SetInstance(this);
	}

	Instance::~Instance()
	{
	Shutdown();
	}

	void Instance::Shutdown()
	{
	if (!IsInList())
	{
	return;
	}
	UnregisterThisInstance();
	chip::app::InteractionModelEngine::GetInstance()->UnregisterCommandHandler(this);
	unregisterAttributeAccessOverride(this);
	}

	CHIP_ERROR Instance::Init()
	{
	// Initialise the current mode with the value of the first mode. This ensures that it is representing a valid mode.
	ReturnErrorOnFailure(mDelegate->GetModeValueByIndex(0, mCurrentMode));

	// Check if the cluster has been selected in zap
	VerifyOrDie(emberAfContainsServer(mEndpointId, mClusterId) == true);

	LoadPersistentAttributes();

	ReturnErrorOnFailure(chip::app::InteractionModelEngine::GetInstance()->RegisterCommandHandler(this));
	VerifyOrReturnError(registerAttributeAccessOverride(this), CHIP_ERROR_INCORRECT_STATE);
	RegisterThisInstance();
	ReturnErrorOnFailure(mDelegate->Init());

	// If the StartUpMode is set, the CurrentMode attribute SHALL be set to the StartUpMode value, when the server is powered up.
	if (!mStartUpMode.IsNull())
	{
	// This behavior does not apply to reboots associated with OTA.
	// After an OTA restart, the CurrentMode attribute SHALL return to its value prior to the restart.
	// todo this only works for matter OTAs. According to the spec, this should also work for general OTAs.
	BootReasonType bootReason = BootReasonType::kUnspecified;
	CHIP_ERROR error = DeviceLayer::GetDiagnosticDataProvider().GetBootReason(bootReason);

	if (error != CHIP_NO_ERROR)
	{
	ChipLogError(
	Zcl, "Unable to retrieve boot reason: %" CHIP_ERROR_FORMAT ". Assuming that we did not reboot because of an OTA",
	error.Format());
	bootReason = BootReasonType::kUnspecified;
	}

	if (bootReason == BootReasonType::kSoftwareUpdateCompleted)
	{
	ChipLogDetail(Zcl, "ModeBase: StartUpMode is ignored for OTA reboot.");
	}
	else
	{
	// Set CurrentMode to StartUpMode
	if (mStartUpMode.Value() != mCurrentMode)
	{
	ChipLogProgress(Zcl, "ModeBase: Changing CurrentMode to the StartUpMode value.");
	Status status = UpdateCurrentMode(mStartUpMode.Value());
	if (status != Status::Success)
	{
	ChipLogError(Zcl, "ModeBase: Failed to change the CurrentMode to the StartUpMode value: %u",
	to_underlying(status));
	return StatusIB(status).ToChipError();
	}

	ChipLogProgress(Zcl, "ModeBase: Successfully initialized CurrentMode to the StartUpMode value %u",
	mStartUpMode.Value());
	}
	}
	}

	#ifdef MATTER_DM_PLUGIN_ON_OFF_SERVER
	// OnMode with Power Up
	// If the On/Off feature is supported and the On/Off cluster attribute StartUpOnOff is present, with a
	// value of On (turn on at power up), then the CurrentMode attribute SHALL be set to the OnMode attribute
	// value when the server is supplied with power, except if the OnMode attribute is null.
	if (emberAfContainsServer(mEndpointId, OnOff::Id) &&
	emberAfContainsAttribute(mEndpointId, OnOff::Id, OnOff::Attributes::StartUpOnOff::Id) &&
	emberAfContainsAttribute(mEndpointId, mClusterId, ModeBase::Attributes::OnMode::Id) &&
	HasFeature(ModeBase::Feature::kOnOff))
	{
	DataModel::Nullable<uint8_t> onMode = GetOnMode();
	bool onOffValueForStartUp = false;
	if (!emberAfIsKnownVolatileAttribute(mEndpointId, OnOff::Id, OnOff::Attributes::StartUpOnOff::Id) &&
	OnOffServer::Instance().getOnOffValueForStartUp(mEndpointId, onOffValueForStartUp) == Status::Success)
	{
	if (onOffValueForStartUp && !onMode.IsNull())
	{
	// Set CurrentMode to OnMode
	if (mOnMode.Value() != mCurrentMode)
	{
	ChipLogProgress(Zcl, "ModeBase: Changing CurrentMode to the OnMode value.");
	Status status = UpdateCurrentMode(mOnMode.Value());
	if (status != Status::Success)
	{
	ChipLogError(Zcl, "ModeBase: Failed to change the CurrentMode to the OnMode value: %u",
	to_underlying(status));
	return StatusIB(status).ToChipError();
	}

	ChipLogProgress(Zcl, "ModeBase: Successfully initialized CurrentMode to the OnMode value %u", mOnMode.Value());
	}
	}
	}
	}
	#endif // MATTER_DM_PLUGIN_ON_OFF_SERVER

	return CHIP_NO_ERROR;
	}

	Status Instance::UpdateCurrentMode(uint8_t aNewMode)
	{
	if (!IsSupportedMode(aNewMode))
	{
	return Protocols::InteractionModel::Status::ConstraintError;
	}
	uint8_t oldMode = mCurrentMode;
	mCurrentMode = aNewMode;
	if (mCurrentMode != oldMode)
	{
	// Write new value to persistent storage.
	ConcreteAttributePath path = ConcreteAttributePath(mEndpointId, mClusterId, Attributes::CurrentMode::Id);
	GetSafeAttributePersistenceProvider()->WriteScalarValue(path, mCurrentMode);
	MatterReportingAttributeChangeCallback(path);
	}
	return Protocols::InteractionModel::Status::Success;
	}

	Status Instance::UpdateStartUpMode(DataModel::Nullable<uint8_t> aNewStartUpMode)
	{
	if (!aNewStartUpMode.IsNull())
	{
	if (!IsSupportedMode(aNewStartUpMode.Value()))
	{
	return Protocols::InteractionModel::Status::ConstraintError;
	}
	}
	DataModel::Nullable<uint8_t> oldStartUpMode = mStartUpMode;
	mStartUpMode = aNewStartUpMode;
	if (mStartUpMode != oldStartUpMode)
	{
	// Write new value to persistent storage.
	ConcreteAttributePath path = ConcreteAttributePath(mEndpointId, mClusterId, Attributes::StartUpMode::Id);
	GetSafeAttributePersistenceProvider()->WriteScalarValue(path, mStartUpMode);
	MatterReportingAttributeChangeCallback(path);
	}
	return Protocols::InteractionModel::Status::Success;
	}

	Status Instance::UpdateOnMode(DataModel::Nullable<uint8_t> aNewOnMode)
	{
	if (!aNewOnMode.IsNull())
	{
	if (!IsSupportedMode(aNewOnMode.Value()))
	{
	return Protocols::InteractionModel::Status::ConstraintError;
	}
	}
	DataModel::Nullable<uint8_t> oldOnMode = mOnMode;
	mOnMode = aNewOnMode;
	if (mOnMode != oldOnMode)
	{
	// Write new value to persistent storage.
	ConcreteAttributePath path = ConcreteAttributePath(mEndpointId, mClusterId, Attributes::OnMode::Id);
	GetSafeAttributePersistenceProvider()->WriteScalarValue(path, mOnMode);
	MatterReportingAttributeChangeCallback(path);
	}
	return Protocols::InteractionModel::Status::Success;
	}

	uint8_t Instance::GetCurrentMode() const
	{
	return mCurrentMode;
	}

	DataModel::Nullable<uint8_t> Instance::GetStartUpMode() const
	{
	return mStartUpMode;
	}

	DataModel::Nullable<uint8_t> Instance::GetOnMode() const
	{
	return mOnMode;
	}

	void Instance::ReportSupportedModesChange()
	{
	MatterReportingAttributeChangeCallback(ConcreteAttributePath(mEndpointId, mClusterId, Attributes::SupportedModes::Id));
	}

	bool Instance::HasFeature(Feature feature) const
	{
	return (mFeature & to_underlying(feature)) != 0;
	}

	bool Instance::IsSupportedMode(uint8_t modeValue)
	{
	uint8_t value;
	for (uint8_t i = 0; mDelegate->GetModeValueByIndex(i, value) != CHIP_ERROR_PROVIDER_LIST_EXHAUSTED; i++)
	{
	if (value == modeValue)
	{
	return true;
	}
	}
	ChipLogDetail(Zcl, "Cannot find a mode with value %u", modeValue);
	return false;
	}

	CHIP_ERROR Instance::GetModeValueByModeTag(uint16_t modeTagValue, uint8_t & value)
	{
	ModeTagStructType tagsBuffer[kMaxNumOfModeTags];
	DataModel::List<ModeTagStructType> mTags(tagsBuffer);
	for (uint8_t i = 0; mDelegate->GetModeTagsByIndex(i, mTags) != CHIP_ERROR_PROVIDER_LIST_EXHAUSTED; i++)
	{
	for (size_t ii = 0; ii < mTags.size(); ii++)
	{
	if (mTags[ii].value == modeTagValue)
	{
	mDelegate->GetModeValueByIndex(i, value);
	return CHIP_NO_ERROR;
	}
	}
	mTags = tagsBuffer;
	}
	ChipLogDetail(Zcl, "Cannot find a mode with mode tag %x", modeTagValue);
	return CHIP_ERROR_PROVIDER_LIST_EXHAUSTED;
	}

	// private methods
	template <typename RequestT, typename FuncT>
	void Instance::HandleCommand(HandlerContext & handlerContext, FuncT func)
	{
	if (!handlerContext.mCommandHandled && (handlerContext.mRequestPath.mCommandId == RequestT::GetCommandId()))
	{
	RequestT requestPayload;

	// If the command matches what the caller is looking for, let's mark this as being handled
	// even if errors happen after this. This ensures that we don't execute any fall-back strategies
	// to handle this command since at this point, the caller is taking responsibility for handling
	// the command in its entirety, warts and all.
	//
	handlerContext.SetCommandHandled();

	if (DataModel::Decode(handlerContext.mPayload, requestPayload) != CHIP_NO_ERROR)
	{
	handlerContext.mCommandHandler.AddStatus(handlerContext.mRequestPath,
	Protocols::InteractionModel::Status::InvalidCommand);
	return;
	}

	func(handlerContext, requestPayload);
	}
	}

	// This function is called by the interaction model engine when a command destined for this instance is received.
	void Instance::InvokeCommand(HandlerContext & handlerContext)
	{
	switch (handlerContext.mRequestPath.mCommandId)
	{
	case ModeBase::Commands::ChangeToMode::Id:
	ChipLogDetail(Zcl, "ModeBase: Entering handling ChangeToModeWithStatus");

	HandleCommand<Commands::ChangeToMode::DecodableType>(
	handlerContext, [this](HandlerContext & ctx, const auto & commandData) { HandleChangeToMode(ctx, commandData); });
	}
	}

	// Implements the read functionality for complex attributes.
	CHIP_ERROR Instance::Read(const ConcreteReadAttributePath & aPath, AttributeValueEncoder & aEncoder)
	{
	switch (aPath.mAttributeId)
	{
	case Attributes::CurrentMode::Id:
	ReturnErrorOnFailure(aEncoder.Encode(mCurrentMode));
	break;
	case Attributes::StartUpMode::Id:
	ReturnErrorOnFailure(aEncoder.Encode(mStartUpMode));
	break;
	case Attributes::OnMode::Id:
	ReturnErrorOnFailure(aEncoder.Encode(mOnMode));
	break;
	case Attributes::FeatureMap::Id:
	ReturnErrorOnFailure(aEncoder.Encode(mFeature));
	break;
	case Attributes::SupportedModes::Id:
	Instance * d = this;
	CHIP_ERROR err = aEncoder.EncodeList([d](const auto & encoder) -> CHIP_ERROR { return d->EncodeSupportedModes(encoder); });
	return err;
	}
	return CHIP_NO_ERROR;
	}

	// Implements checking before attribute writes.
	CHIP_ERROR Instance::Write(const ConcreteDataAttributePath & attributePath, AttributeValueDecoder & aDecoder)
	{
	DataModel::Nullable<uint8_t> newMode;
	ReturnErrorOnFailure(aDecoder.Decode(newMode));
	Status status;

	switch (attributePath.mAttributeId)
	{
	case ModeBase::Attributes::StartUpMode::Id:
	status = UpdateStartUpMode(newMode);
	return StatusIB(status).ToChipError();
	case ModeBase::Attributes::OnMode::Id:
	status = UpdateOnMode(newMode);
	return StatusIB(status).ToChipError();
	}

	return CHIP_ERROR_INCORRECT_STATE;
	}

	void Instance::RegisterThisInstance()
	{
	if (!gModeBaseAliasesInstances.Contains(this))
	{
	gModeBaseAliasesInstances.PushBack(this);
	}
	}

	void Instance::UnregisterThisInstance()
	{
	gModeBaseAliasesInstances.Remove(this);
	}

	void Instance::HandleChangeToMode(HandlerContext & ctx, const Commands::ChangeToMode::DecodableType & commandData)
	{
	MATTER_TRACE_SCOPE("ChangeToMode", "ModeBase");
	uint8_t newMode = commandData.newMode;

	Commands::ChangeToModeResponse::Type response;

	// If the NewMode field doesn't match the Mode field of any entry of the SupportedModes list,
	// the ChangeToModeResponse command's Status field SHALL indicate UnsupportedMode and
	// the StatusText field SHALL be included and MAY be used to indicate the issue, with a human readable string,
	// or include an empty string.
	// We are leaving the StatusText empty since the Status is descriptive enough.
	if (!IsSupportedMode(newMode))
	{
	ChipLogError(Zcl, "ModeBase: Failed to find the option with mode %u", newMode);
	response.status = to_underlying(StatusCode::kUnsupportedMode);
	ctx.mCommandHandler.AddResponse(ctx.mRequestPath, response);
	return;
	}

	// If the NewMode field is the same as the value of the CurrentMode attribute
	// the ChangeToModeResponse command SHALL have the Status field set to Success and
	// the StatusText field MAY be supplied with a human readable string or include an empty string.
	// We are leaving the StatusText empty since the Status is descriptive enough.
	if (newMode == GetCurrentMode())
	{
	response.status = to_underlying(ModeBase::StatusCode::kSuccess);
	ctx.mCommandHandler.AddResponse(ctx.mRequestPath, response);
	return;
	}

	mDelegate->HandleChangeToMode(newMode, response);

	if (response.status == to_underlying(StatusCode::kSuccess))
	{
	UpdateCurrentMode(newMode);
	ChipLogProgress(Zcl, "ModeBase: HandleChangeToMode changed to mode %u", newMode);
	}

	ctx.mCommandHandler.AddResponse(ctx.mRequestPath, response);
	}

	void Instance::LoadPersistentAttributes()
	{
	// Load Current Mode
	uint8_t tempCurrentMode;
	CHIP_ERROR err = GetSafeAttributePersistenceProvider()->ReadScalarValue(
	ConcreteAttributePath(mEndpointId, mClusterId, Attributes::CurrentMode::Id), tempCurrentMode);
	if (err == CHIP_NO_ERROR)
	{
	Status status = UpdateCurrentMode(tempCurrentMode);
	if (status == Status::Success)
	{
	ChipLogDetail(Zcl, "ModeBase: Loaded CurrentMode as %u", GetCurrentMode());
	}
	else
	{
	ChipLogError(Zcl, "ModeBase: Could not update CurrentMode to %u: %u", tempCurrentMode, to_underlying(status));
	}
	}
	else
	{
	// If we cannot find the previous CurrentMode, we will assume it to be the first mode in the
	// list, as was initialised in the constructor.
	ChipLogDetail(Zcl, "ModeBase: Unable to load the CurrentMode from the KVS. Assuming %u", GetCurrentMode());
	}

	// Load Start-Up Mode
	DataModel::Nullable<uint8_t> tempStartUpMode;
	err = GetSafeAttributePersistenceProvider()->ReadScalarValue(
	ConcreteAttributePath(mEndpointId, mClusterId, Attributes::StartUpMode::Id), tempStartUpMode);
	if (err == CHIP_NO_ERROR)
	{
	Status status = UpdateStartUpMode(tempStartUpMode);
	if (status == Status::Success)
	{
	if (GetStartUpMode().IsNull())
	{
	ChipLogDetail(Zcl, "ModeBase: Loaded StartUpMode as null");
	}
	else
	{
	ChipLogDetail(Zcl, "ModeBase: Loaded StartUpMode as %u", GetStartUpMode().Value());
	}
	}
	else
	{
	ChipLogError(Zcl, "ModeBase: Could not update StartUpMode: %u", to_underlying(status));
	}
	}
	else
	{
	ChipLogDetail(Zcl, "ModeBase: Unable to load the StartUpMode from the KVS. Assuming null");
	}

	// Load On Mode
	DataModel::Nullable<uint8_t> tempOnMode;
	err = GetSafeAttributePersistenceProvider()->ReadScalarValue(
	ConcreteAttributePath(mEndpointId, mClusterId, Attributes::OnMode::Id), tempOnMode);
	if (err == CHIP_NO_ERROR)
	{
	Status status = UpdateOnMode(tempOnMode);
	if (status == Status::Success)
	{
	if (GetOnMode().IsNull())
	{
	ChipLogDetail(Zcl, "ModeBase: Loaded OnMode as null");
	}
	else
	{
	ChipLogDetail(Zcl, "ModeBase: Loaded OnMode as %u", GetOnMode().Value());
	}
	}
	else
	{
	ChipLogError(Zcl, "ModeBase: Could not update OnMode: %u", to_underlying(status));
	}
	}
	else
	{
	ChipLogDetail(Zcl, "ModeBase: Unable to load the OnMode from the KVS. Assuming null");
	}
	}

	CHIP_ERROR Instance::EncodeSupportedModes(const AttributeValueEncoder::ListEncodeHelper & encoder)
	{
	for (uint8_t i = 0; true; i++)
	{
	ModeOptionStructType mode;

	// Get the mode label
	char buffer[kMaxModeLabelSize];
	MutableCharSpan label(buffer);
	auto err = mDelegate->GetModeLabelByIndex(i, label);
	if (err == CHIP_ERROR_PROVIDER_LIST_EXHAUSTED)
	{
	return CHIP_NO_ERROR;
	}
	ReturnErrorOnFailure(err);

	mode.label = label;

	// Get the mode value
	ReturnErrorOnFailure(mDelegate->GetModeValueByIndex(i, mode.mode));

	// Get the mode tags
	ModeTagStructType tagsBuffer[kMaxNumOfModeTags];
	DataModel::List<ModeTagStructType> tags(tagsBuffer);
	ReturnErrorOnFailure(mDelegate->GetModeTagsByIndex(i, tags));
	mode.modeTags = tags;

	ReturnErrorOnFailure(encoder.Encode(mode));
	}
	return CHIP_NO_ERROR;
	}

	IntrusiveList<Instance> & GetModeBaseInstanceList()
	{
	return gModeBaseAliasesInstances;
	}

	} // namespace ModeBase
	} // namespace Clusters
	} // namespace app
	} // namespace chip