text: /*
   *
   *    Copyright (c) 2020 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.
   */
  
  /**
   * @file DeviceCallbacks.cpp
   *
   * Implements all the callbacks to the application from the CHIP Stack
   *
   **/
  #include "DeviceCallbacks.h"
  
  #include "CHIPDeviceManager.h"
  #include <app-common/zap-generated/attribute-id.h>
  #include <app-common/zap-generated/cluster-id.h>
  #include <app/CommandHandler.h>
  #include <app/server/Dnssd.h>
  #include <app/util/af.h>
  #include <app/util/basic-types.h>
  #include <app/util/util.h>
  #include <lib/dnssd/Advertiser.h>
  #include <support/CodeUtils.h>
  #include <support/logging/CHIPLogging.h>
  #include <support/logging/Constants.h>
  #if CHIP_DEVICE_CONFIG_ENABLE_OTA_REQUESTOR
  #include <ota/OTAInitializer.h>
  #endif
  
  #include "Globals.h"
  #include "LEDWidget.h"
  
  static const char * TAG = "app-devicecallbacks";
  
  using namespace ::chip;
  using namespace ::chip::Inet;
  using namespace ::chip::System;
  using namespace ::chip::DeviceLayer;
  using namespace ::chip::DeviceManager;
  using namespace ::chip::Logging;
  
  uint32_t identifyTimerCount;
  constexpr uint32_t kIdentifyTimerDelayMS     = 250;
  constexpr uint32_t kInitOTARequestorDelaySec = 3;
  
  #if CHIP_DEVICE_CONFIG_ENABLE_OTA_REQUESTOR
  void InitOTARequestorHandler(System::Layer * systemLayer, void * appState)
  {
      OTAInitializer::Instance().InitOTARequestor();
  }
  #endif
  
  void DeviceCallbacks::DeviceEventCallback(const ChipDeviceEvent * event, intptr_t arg)
  {
      switch (event->Type)
      {
      case DeviceEventType::kInternetConnectivityChange:
          OnInternetConnectivityChange(event);
          break;
  
      case DeviceEventType::kSessionEstablished:
          OnSessionEstablished(event);
          break;
      case DeviceEventType::kInterfaceIpAddressChanged:
          if ((event->InterfaceIpAddressChanged.Type == InterfaceIpChangeType::kIpV4_Assigned) ||
              (event->InterfaceIpAddressChanged.Type == InterfaceIpChangeType::kIpV6_Assigned))
          {
              // MDNS server restart on any ip assignment: if link local ipv6 is configured, that
              // will not trigger a 'internet connectivity change' as there is no internet
              // connectivity. MDNS still wants to refresh its listening interfaces to include the
              // newly selected address.
              chip::app::DnssdServer::Instance().StartServer();
          }
          break;
      }
  }
  
  void DeviceCallbacks::PostAttributeChangeCallback(EndpointId endpointId, ClusterId clusterId, AttributeId attributeId, uint8_t type,
                                                    uint16_t size, uint8_t * value)
  {
      switch (clusterId)
      {
      case ZCL_ON_OFF_CLUSTER_ID:
          OnOnOffPostAttributeChangeCallback(endpointId, attributeId, value);
          break;
  
      case ZCL_IDENTIFY_CLUSTER_ID:
          OnIdentifyPostAttributeChangeCallback(endpointId, attributeId, value);
          break;
  
      default:
          break;
      }
  }
  
  void DeviceCallbacks::OnInternetConnectivityChange(const ChipDeviceEvent * event)
  {
  #if CHIP_DEVICE_CONFIG_ENABLE_OTA_REQUESTOR
      static bool isOTAInitialized = false;
  #endif
      if (event->InternetConnectivityChange.IPv4 == kConnectivity_Established)
      {
          ChipLogProgress(DeviceLayer, "IPv4 Server ready...");
          chip::app::DnssdServer::Instance().StartServer();
      }
      else if (event->InternetConnectivityChange.IPv4 == kConnectivity_Lost)
      {
          ChipLogProgress(DeviceLayer, "Lost IPv4 connectivity...");
      }
      if (event->InternetConnectivityChange.IPv6 == kConnectivity_Established)
      {
          ChipLogProgress(DeviceLayer, "IPv6 Server ready...");
          chip::app::DnssdServer::Instance().StartServer();
  #if CHIP_DEVICE_CONFIG_ENABLE_OTA_REQUESTOR
          // Init OTA requestor only when we have gotten IPv6 address
          if (!isOTAInitialized)
          {
              chip::DeviceLayer::SystemLayer().StartTimer(chip::System::Clock::Seconds32(kInitOTARequestorDelaySec),
                                                          InitOTARequestorHandler, nullptr);
              isOTAInitialized = true;
          }
  #endif
      }
      else if (event->InternetConnectivityChange.IPv6 == kConnectivity_Lost)
      {
          ChipLogProgress(DeviceLayer, "Lost IPv6 connectivity...");
      }
  }
  
  void DeviceCallbacks::OnSessionEstablished(const ChipDeviceEvent * event)
  {
      if (event->SessionEstablished.IsCommissioner)
      {
          ChipLogProgress(DeviceLayer, "Commissioner detected!");
      }
  }
  
  void DeviceCallbacks::OnOnOffPostAttributeChangeCallback(EndpointId endpointId, AttributeId attributeId, uint8_t * value)
  {
      VerifyOrExit(attributeId == ZCL_ON_OFF_ATTRIBUTE_ID,
                   ChipLogError(DeviceLayer, TAG, "Unhandled Attribute ID: '0x%04x", attributeId));
      VerifyOrExit(endpointId == 1 || endpointId == 2,
                   ChipLogError(DeviceLayer, TAG, "Unexpected EndPoint ID: `0x%02x'", endpointId));
  
      // At this point we can assume that value points to a bool value.
      statusLED1.Set(*value);
  
  exit:
      return;
  }
  
  void IdentifyTimerHandler(Layer * systemLayer, void * appState, CHIP_ERROR error)
  {
      if (identifyTimerCount)
      {
          identifyTimerCount--;
      }
  }
  
  void DeviceCallbacks::OnIdentifyPostAttributeChangeCallback(EndpointId endpointId, AttributeId attributeId, uint8_t * value)
  {
      VerifyOrExit(attributeId == ZCL_IDENTIFY_TIME_ATTRIBUTE_ID,
                   ChipLogError(DeviceLayer, "[%s] Unhandled Attribute ID: '0x%04x", TAG, attributeId));
      VerifyOrExit(endpointId == 1, ChipLogError(DeviceLayer, "[%s] Unexpected EndPoint ID: `0x%02x'", TAG, endpointId));
  
      // timerCount represents the number of callback executions before we stop the timer.
      // value is expressed in seconds and the timer is fired every 250ms, so just multiply value by 4.
      // Also, we want timerCount to be odd number, so the ligth state ends in the same state it starts.
      identifyTimerCount = (*value) * 4;
  exit:
      return;
  }
  
  bool emberAfBasicClusterMfgSpecificPingCallback(chip::app::CommandHandler * commandObj)
  {
      emberAfSendDefaultResponse(emberAfCurrentCommand(), EMBER_ZCL_STATUS_SUCCESS);
      return true;
  }
  