src/platform/silabs/ConnectivityManagerImpl_WIFI.cpp - third_party/github/project-chip/connectedhomeip - Git at Google

 /*
  *
  *    Copyright (c) 2020 Project CHIP Authors
  *    Copyright (c) 2019 Nest Labs, Inc.
  *
  *    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.
  */
 /* this file behaves like a config.h, comes first */
 #include <platform/internal/CHIPDeviceLayerInternal.h>

 #include <lib/support/CodeUtils.h>
 #include <lib/support/logging/CHIPLogging.h>
 #include <platform/ConnectivityManager.h>
 #include <platform/internal/BLEManager.h>
 #include <platform/silabs/NetworkCommissioningWiFiDriver.h>

 #include <lwip/dns.h>
 #include <lwip/ip_addr.h>
 #include <lwip/nd6.h>
 #include <lwip/netif.h>

 #include <platform/internal/GenericConnectivityManagerImpl_UDP.ipp>

 #if INET_CONFIG_ENABLE_TCP_ENDPOINT
 #include <platform/internal/GenericConnectivityManagerImpl_TCP.ipp>
 #endif

 #if CHIP_DEVICE_CONFIG_ENABLE_CHIPOBLE
 #include <platform/internal/GenericConnectivityManagerImpl_BLE.ipp>
 #endif

 #include "CHIPDevicePlatformConfig.h"
 #include "wfx_host_events.h"

 using namespace ::chip;
 using namespace ::chip::Inet;
 using namespace ::chip::System;
 using namespace ::chip::TLV;
 using namespace ::chip::DeviceLayer::Internal;

 namespace chip {
 namespace DeviceLayer {

 ConnectivityManagerImpl ConnectivityManagerImpl::sInstance;

 CHIP_ERROR ConnectivityManagerImpl::_Init()
 {
     CHIP_ERROR err;
     // Queue work items to bootstrap the AP and station state machines once the Chip event loop is running.
     mWiFiStationMode              = kWiFiStationMode_Disabled;
     mWiFiStationState             = kWiFiStationState_NotConnected;
     mLastStationConnectFailTime   = System::Clock::kZero;
     mWiFiStationReconnectInterval = System::Clock::Milliseconds32(CHIP_DEVICE_CONFIG_WIFI_STATION_RECONNECT_INTERVAL);
     mFlags.ClearAll();

     // TODO Initialize the Chip Addressing and Routing Module.

     // Ensure that station mode is enabled.
     wfx_enable_sta_mode();

     err = DeviceLayer::SystemLayer().ScheduleWork(DriveStationState, NULL);

     SuccessOrExit(err);

 exit:
     return err;
 }

 void ConnectivityManagerImpl::_OnPlatformEvent(const ChipDeviceEvent * event)
 {
     // Forward the event to the generic base classes as needed.
     // Handle Wfx wifi events...
     if (event->Type == DeviceEventType::kWFXSystemEvent)
     {
         if (event->Platform.WFXSystemEvent.eventBase == WIFI_EVENT)
         {
             switch (event->Platform.WFXSystemEvent.data.genericMsgEvent.header.id)
             {
             case SL_WFX_STARTUP_IND_ID:
                 ChipLogProgress(DeviceLayer, "WIFI_EVENT_STA_START");
                 DriveStationState();
                 break;
             case SL_WFX_CONNECT_IND_ID:
                 ChipLogProgress(DeviceLayer, "WIFI_EVENT_STA_CONNECTED");
                 if (mWiFiStationState == kWiFiStationState_Connecting)
                 {
                     if (event->Platform.WFXSystemEvent.data.connectEvent.body.status == 0)
                     {
                         ChangeWiFiStationState(kWiFiStationState_Connecting_Succeeded);
                     }
                     else
                     {
                         ChangeWiFiStationState(kWiFiStationState_Connecting_Failed);
                     }
                 }
                 DriveStationState();
                 break;
             case SL_WFX_DISCONNECT_IND_ID:
                 ChipLogProgress(DeviceLayer, "WIFI_EVENT_STA_DISCONNECTED");
                 if (mWiFiStationState == kWiFiStationState_Connecting)
                 {
                     ChangeWiFiStationState(kWiFiStationState_Connecting_Failed);
                 }
                 DriveStationState();
                 break;
             default:
                 break;
             }
         }
         else if (event->Platform.WFXSystemEvent.eventBase == IP_EVENT)
         {
             switch (event->Platform.WFXSystemEvent.data.genericMsgEvent.header.id)
             {
             case IP_EVENT_STA_GOT_IP:
                 ChipLogProgress(DeviceLayer, "IP_EVENT_STA_GOT_IP");
                 UpdateInternetConnectivityState();
                 break;
             case IP_EVENT_STA_LOST_IP:
                 ChipLogProgress(DeviceLayer, "IP_EVENT_STA_LOST_IP");
                 UpdateInternetConnectivityState();
                 break;
             case IP_EVENT_GOT_IP6:
                 ChipLogProgress(DeviceLayer, "IP_EVENT_GOT_IP6");
                 UpdateInternetConnectivityState();
                 break;
             default:
                 break;
             }
         }
     }
 }

 ConnectivityManager::WiFiStationMode ConnectivityManagerImpl::_GetWiFiStationMode(void)
 {
     if (mWiFiStationMode != kWiFiStationMode_ApplicationControlled)
     {
         wifi_mode_t curWiFiMode = wfx_get_wifi_mode();
         if ((curWiFiMode == WIFI_MODE_STA) || (curWiFiMode == WIFI_MODE_APSTA))
         {
             mWiFiStationMode = kWiFiStationMode_Enabled;
         }
         else
         {
             mWiFiStationMode = kWiFiStationMode_Disabled;
         }
     }
     return mWiFiStationMode;
 }

 bool ConnectivityManagerImpl::_IsWiFiStationProvisioned(void)
 {
     wfx_wifi_provision_t wifiConfig;
     if (wfx_get_wifi_provision(&wifiConfig))
     {
         return (wifiConfig.ssid[0] != 0);
     }
     return false;
 }

 bool ConnectivityManagerImpl::_IsWiFiStationEnabled(void)
 {
     return wfx_is_sta_mode_enabled();
 }

 CHIP_ERROR ConnectivityManagerImpl::_SetWiFiStationMode(ConnectivityManager::WiFiStationMode val)
 {
     DeviceLayer::SystemLayer().ScheduleWork(DriveStationState, NULL);

     if (mWiFiStationMode != val)
     {
         ChipLogProgress(DeviceLayer, "WiFi station mode change: %s -> %s", WiFiStationModeToStr(mWiFiStationMode),
                         WiFiStationModeToStr(val));
     }

     mWiFiStationMode = val;

     return CHIP_NO_ERROR;
 }

 CHIP_ERROR ConnectivityManagerImpl::_SetWiFiStationReconnectInterval(System::Clock::Timeout val)
 {
     mWiFiStationReconnectInterval = val;
     return CHIP_NO_ERROR;
 }

 void ConnectivityManagerImpl::_ClearWiFiStationProvision(void)
 {
     if (mWiFiStationMode != kWiFiStationMode_ApplicationControlled)
     {
         wfx_clear_wifi_provision();

         DeviceLayer::SystemLayer().ScheduleWork(DriveStationState, NULL);
     }
 }

 CHIP_ERROR ConnectivityManagerImpl::_GetAndLogWifiStatsCounters(void)
 {
     return CHIP_ERROR_NOT_IMPLEMENTED;
 }

 void ConnectivityManagerImpl::_OnWiFiScanDone()
 {
     // CHIP_ERROR_NOT_IMPLEMENTED
 }

 void ConnectivityManagerImpl::_OnWiFiStationProvisionChange()
 {
     // Schedule a call to the DriveStationState method to adjust the station state as needed.
     ChipLogProgress(DeviceLayer, "_ON WIFI PROVISION CHANGE");
     DeviceLayer::SystemLayer().ScheduleWork(DriveStationState, NULL);
 }

 // == == == == == == == == == == ConnectivityManager Private Methods == == == == == == == == == ==

 void ConnectivityManagerImpl::DriveStationState()
 {
     CHIP_ERROR err = CHIP_NO_ERROR;
     sl_status_t serr;
     bool stationConnected;

     // Refresh the current station mode.
     GetWiFiStationMode();

     // If the station interface is NOT under application control...
     if (mWiFiStationMode != kWiFiStationMode_ApplicationControlled)
     {
         // Ensure that the WFX is started.
         if ((serr = wfx_wifi_start()) != SL_STATUS_OK)
         {
             ChipLogError(DeviceLayer, "wfx_wifi_start() failed: %s", chip::ErrorStr(err));
             return;
         }
         // Ensure that station mode is enabled in the WFX WiFi layer.
         wfx_enable_sta_mode();
     }

     stationConnected = wfx_is_sta_connected();

     // If the station interface is currently connected ...
     if (stationConnected)
     {
         // Advance the station state to Connected if it was previously NotConnected or
         // a previously initiated connect attempt succeeded.
         if (mWiFiStationState == kWiFiStationState_NotConnected || mWiFiStationState == kWiFiStationState_Connecting_Succeeded)
         {
             ChangeWiFiStationState(kWiFiStationState_Connected);
             ChipLogProgress(DeviceLayer, "WiFi station interface connected");
             mLastStationConnectFailTime = System::Clock::kZero;
             OnStationConnected();
         }

         // If the WiFi station interface is no longer enabled, or no longer provisioned,
         // disconnect the station from the AP, unless the WiFi station mode is currently
         // under application control.
 #ifndef CHIP_ONNETWORK_PAIRING
         if (mWiFiStationMode != kWiFiStationMode_ApplicationControlled &&
             (mWiFiStationMode != kWiFiStationMode_Enabled || !IsWiFiStationProvisioned()))
         {
             ChipLogProgress(DeviceLayer, "Disconnecting WiFi station interface");
             serr = wfx_sta_discon();
             if (serr != SL_STATUS_OK)
             {
                 ChipLogError(DeviceLayer, "wfx_wifi_disconnect() failed: %s", chip::ErrorStr(err));
             }
             SuccessOrExit(serr);

             ChangeWiFiStationState(kWiFiStationState_Disconnecting);
         }
 #endif
     }
     // Otherwise the station interface is NOT connected to an AP, so...
     else
     {
         System::Clock::Timestamp now = System::SystemClock().GetMonotonicTimestamp();

         // Advance the station state to NotConnected if it was previously Connected or Disconnecting,
         // or if a previous initiated connect attempt failed.
         if (mWiFiStationState == kWiFiStationState_Connected || mWiFiStationState == kWiFiStationState_Disconnecting ||
             mWiFiStationState == kWiFiStationState_Connecting_Failed)
         {
             WiFiStationState prevState = mWiFiStationState;
             ChangeWiFiStationState(kWiFiStationState_NotConnected);
             if (prevState != kWiFiStationState_Connecting_Failed)
             {
                 ChipLogProgress(DeviceLayer, "WiFi station interface disconnected");
                 mLastStationConnectFailTime = System::Clock::kZero;
                 OnStationDisconnected();
             }
             else
             {
                 mLastStationConnectFailTime = now;
             }
         }

         // If the WiFi station interface is now enabled and provisioned (and by implication,
         // not presently under application control), AND the system is not in the process of
         // scanning, then...
         if (mWiFiStationMode == kWiFiStationMode_Enabled && IsWiFiStationProvisioned())
         {
             // Initiate a connection to the AP if we haven't done so before, or if enough
             // time has passed since the last attempt.
             if (mLastStationConnectFailTime == System::Clock::kZero ||
                 now >= mLastStationConnectFailTime + mWiFiStationReconnectInterval)
             {
                 if (mWiFiStationState != kWiFiStationState_Connecting)
                 {
                     ChipLogProgress(DeviceLayer, "Attempting to connect WiFi");
                     if ((serr = wfx_connect_to_ap()) != SL_STATUS_OK)
                     {
                         ChipLogError(DeviceLayer, "wfx_connect_to_ap() failed.");
                     }
                     SuccessOrExit(serr);

                     ChangeWiFiStationState(kWiFiStationState_Connecting);
                 }
             }

             // Otherwise arrange another connection attempt at a suitable point in the future.
             else
             {
                 System::Clock::Timestamp timeToNextConnect = (mLastStationConnectFailTime + mWiFiStationReconnectInterval) - now;

                 ChipLogProgress(DeviceLayer, "Next WiFi station reconnect in %" PRIu32 " ms",
                                 System::Clock::Milliseconds32(timeToNextConnect).count());

                 ReturnOnFailure(DeviceLayer::SystemLayer().StartTimer(timeToNextConnect, DriveStationState, NULL));
             }
         }
     }

 exit:

     ChipLogProgress(DeviceLayer, "Done driving station state, nothing else to do...");
     // Kick-off any pending network scan that might have been deferred due to the activity
     // of the WiFi station.
 }

 void ConnectivityManagerImpl::OnStationConnected()
 {
     ChipDeviceEvent event;
     wfx_setup_ip6_link_local(SL_WFX_STA_INTERFACE);

     NetworkCommissioning::SlWiFiDriver::GetInstance().OnConnectWiFiNetwork();
     // Alert other components of the new state.
     event.Type                          = DeviceEventType::kWiFiConnectivityChange;
     event.WiFiConnectivityChange.Result = kConnectivity_Established;
     (void) PlatformMgr().PostEvent(&event);

     UpdateInternetConnectivityState();
 }

 void ConnectivityManagerImpl::OnStationDisconnected()
 {
     // TODO Invoke WARM to perform actions that occur when the WiFi station interface goes down.

     // Alert other components of the new state.
     ChipDeviceEvent event;
     event.Type                          = DeviceEventType::kWiFiConnectivityChange;
     event.WiFiConnectivityChange.Result = kConnectivity_Lost;
     (void) PlatformMgr().PostEvent(&event);

     UpdateInternetConnectivityState();
 }

 void ConnectivityManagerImpl::DriveStationState(::chip::System::Layer * aLayer, void * aAppState)
 {
     sInstance.DriveStationState();
 }

 void ConnectivityManagerImpl::ChangeWiFiStationState(WiFiStationState newState)
 {
     if (mWiFiStationState != newState)
     {
         ChipLogProgress(DeviceLayer, "WiFi station state change: %s -> %s", WiFiStationStateToStr(mWiFiStationState),
                         WiFiStationStateToStr(newState));
         mWiFiStationState = newState;
     }
 }

 void ConnectivityManagerImpl::UpdateInternetConnectivityState(void)
 {
     bool haveIPv4Conn = false;
     bool haveIPv6Conn = false;
     bool hadIPv4Conn  = mFlags.Has(ConnectivityFlags::kHaveIPv4InternetConnectivity);
     bool hadIPv6Conn  = mFlags.Has(ConnectivityFlags::kHaveIPv6InternetConnectivity);
     IPAddress addr;

     // If the WiFi station is currently in the connected state...
     if (mWiFiStationState == kWiFiStationState_Connected)
     {
 #if CHIP_DEVICE_CONFIG_ENABLE_IPV4
         haveIPv4Conn = wfx_have_ipv4_addr(SL_WFX_STA_INTERFACE);
 #endif /* CHIP_DEVICE_CONFIG_ENABLE_IPV4 */
         haveIPv6Conn = wfx_have_ipv6_addr(SL_WFX_STA_INTERFACE);
     }

     // If the internet connectivity state has changed...
     if (haveIPv4Conn != hadIPv4Conn || haveIPv6Conn != hadIPv6Conn)
     {
         // Update the current state.
         mFlags.Set(ConnectivityFlags::kHaveIPv4InternetConnectivity, haveIPv4Conn)
             .Set(ConnectivityFlags::kHaveIPv6InternetConnectivity, haveIPv6Conn);

         // Alert other components of the state change.
         ChipDeviceEvent event;
         event.Type                                 = DeviceEventType::kInternetConnectivityChange;
         event.InternetConnectivityChange.IPv4      = GetConnectivityChange(hadIPv4Conn, haveIPv4Conn);
         event.InternetConnectivityChange.IPv6      = GetConnectivityChange(hadIPv6Conn, haveIPv6Conn);
         event.InternetConnectivityChange.ipAddress = addr;

         (void) PlatformMgr().PostEvent(&event);

         if (haveIPv4Conn != hadIPv4Conn)
         {
             ChipLogProgress(DeviceLayer, "%s Internet connectivity %s", "IPv4", (haveIPv4Conn) ? "ESTABLISHED" : "LOST");
         }

         if (haveIPv6Conn != hadIPv6Conn)
         {
             ChipLogProgress(DeviceLayer, "%s Internet connectivity %s", "IPv6", (haveIPv6Conn) ? "ESTABLISHED" : "LOST");
         }
     }
 }

 } // namespace DeviceLayer
 } // namespace chip
	/*
	*
	* Copyright (c) 2020 Project CHIP Authors
	* Copyright (c) 2019 Nest Labs, Inc.
	*
	* 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.
	*/
	/* this file behaves like a config.h, comes first */
	#include <platform/internal/CHIPDeviceLayerInternal.h>

	#include <lib/support/CodeUtils.h>
	#include <lib/support/logging/CHIPLogging.h>
	#include <platform/ConnectivityManager.h>
	#include <platform/internal/BLEManager.h>
	#include <platform/silabs/NetworkCommissioningWiFiDriver.h>

	#include <lwip/dns.h>
	#include <lwip/ip_addr.h>
	#include <lwip/nd6.h>
	#include <lwip/netif.h>

	#include <platform/internal/GenericConnectivityManagerImpl_UDP.ipp>

	#if INET_CONFIG_ENABLE_TCP_ENDPOINT
	#include <platform/internal/GenericConnectivityManagerImpl_TCP.ipp>
	#endif

	#if CHIP_DEVICE_CONFIG_ENABLE_CHIPOBLE
	#include <platform/internal/GenericConnectivityManagerImpl_BLE.ipp>
	#endif

	#include "CHIPDevicePlatformConfig.h"
	#include "wfx_host_events.h"

	using namespace ::chip;
	using namespace ::chip::Inet;
	using namespace ::chip::System;
	using namespace ::chip::TLV;
	using namespace ::chip::DeviceLayer::Internal;

	namespace chip {
	namespace DeviceLayer {

	ConnectivityManagerImpl ConnectivityManagerImpl::sInstance;

	CHIP_ERROR ConnectivityManagerImpl::_Init()
	{
	CHIP_ERROR err;
	// Queue work items to bootstrap the AP and station state machines once the Chip event loop is running.
	mWiFiStationMode = kWiFiStationMode_Disabled;
	mWiFiStationState = kWiFiStationState_NotConnected;
	mLastStationConnectFailTime = System::Clock::kZero;
	mWiFiStationReconnectInterval = System::Clock::Milliseconds32(CHIP_DEVICE_CONFIG_WIFI_STATION_RECONNECT_INTERVAL);
	mFlags.ClearAll();

	// TODO Initialize the Chip Addressing and Routing Module.

	// Ensure that station mode is enabled.
	wfx_enable_sta_mode();

	err = DeviceLayer::SystemLayer().ScheduleWork(DriveStationState, NULL);

	SuccessOrExit(err);

	exit:
	return err;
	}

	void ConnectivityManagerImpl::_OnPlatformEvent(const ChipDeviceEvent * event)
	{
	// Forward the event to the generic base classes as needed.
	// Handle Wfx wifi events...
	if (event->Type == DeviceEventType::kWFXSystemEvent)
	{
	if (event->Platform.WFXSystemEvent.eventBase == WIFI_EVENT)
	{
	switch (event->Platform.WFXSystemEvent.data.genericMsgEvent.header.id)
	{
	case SL_WFX_STARTUP_IND_ID:
	ChipLogProgress(DeviceLayer, "WIFI_EVENT_STA_START");
	DriveStationState();
	break;
	case SL_WFX_CONNECT_IND_ID:
	ChipLogProgress(DeviceLayer, "WIFI_EVENT_STA_CONNECTED");
	if (mWiFiStationState == kWiFiStationState_Connecting)
	{
	if (event->Platform.WFXSystemEvent.data.connectEvent.body.status == 0)
	{
	ChangeWiFiStationState(kWiFiStationState_Connecting_Succeeded);
	}
	else
	{
	ChangeWiFiStationState(kWiFiStationState_Connecting_Failed);
	}
	}
	DriveStationState();
	break;
	case SL_WFX_DISCONNECT_IND_ID:
	ChipLogProgress(DeviceLayer, "WIFI_EVENT_STA_DISCONNECTED");
	if (mWiFiStationState == kWiFiStationState_Connecting)
	{
	ChangeWiFiStationState(kWiFiStationState_Connecting_Failed);
	}
	DriveStationState();
	break;
	default:
	break;
	}
	}
	else if (event->Platform.WFXSystemEvent.eventBase == IP_EVENT)
	{
	switch (event->Platform.WFXSystemEvent.data.genericMsgEvent.header.id)
	{
	case IP_EVENT_STA_GOT_IP:
	ChipLogProgress(DeviceLayer, "IP_EVENT_STA_GOT_IP");
	UpdateInternetConnectivityState();
	break;
	case IP_EVENT_STA_LOST_IP:
	ChipLogProgress(DeviceLayer, "IP_EVENT_STA_LOST_IP");
	UpdateInternetConnectivityState();
	break;
	case IP_EVENT_GOT_IP6:
	ChipLogProgress(DeviceLayer, "IP_EVENT_GOT_IP6");
	UpdateInternetConnectivityState();
	break;
	default:
	break;
	}
	}
	}
	}

	ConnectivityManager::WiFiStationMode ConnectivityManagerImpl::_GetWiFiStationMode(void)
	{
	if (mWiFiStationMode != kWiFiStationMode_ApplicationControlled)
	{
	wifi_mode_t curWiFiMode = wfx_get_wifi_mode();
	if ((curWiFiMode == WIFI_MODE_STA) \|\| (curWiFiMode == WIFI_MODE_APSTA))
	{
	mWiFiStationMode = kWiFiStationMode_Enabled;
	}
	else
	{
	mWiFiStationMode = kWiFiStationMode_Disabled;
	}
	}
	return mWiFiStationMode;
	}

	bool ConnectivityManagerImpl::_IsWiFiStationProvisioned(void)
	{
	wfx_wifi_provision_t wifiConfig;
	if (wfx_get_wifi_provision(&wifiConfig))
	{
	return (wifiConfig.ssid[0] != 0);
	}
	return false;
	}

	bool ConnectivityManagerImpl::_IsWiFiStationEnabled(void)
	{
	return wfx_is_sta_mode_enabled();
	}

	CHIP_ERROR ConnectivityManagerImpl::_SetWiFiStationMode(ConnectivityManager::WiFiStationMode val)
	{
	DeviceLayer::SystemLayer().ScheduleWork(DriveStationState, NULL);

	if (mWiFiStationMode != val)
	{
	ChipLogProgress(DeviceLayer, "WiFi station mode change: %s -> %s", WiFiStationModeToStr(mWiFiStationMode),
	WiFiStationModeToStr(val));
	}

	mWiFiStationMode = val;

	return CHIP_NO_ERROR;
	}

	CHIP_ERROR ConnectivityManagerImpl::_SetWiFiStationReconnectInterval(System::Clock::Timeout val)
	{
	mWiFiStationReconnectInterval = val;
	return CHIP_NO_ERROR;
	}

	void ConnectivityManagerImpl::_ClearWiFiStationProvision(void)
	{
	if (mWiFiStationMode != kWiFiStationMode_ApplicationControlled)
	{
	wfx_clear_wifi_provision();

	DeviceLayer::SystemLayer().ScheduleWork(DriveStationState, NULL);
	}
	}

	CHIP_ERROR ConnectivityManagerImpl::_GetAndLogWifiStatsCounters(void)
	{
	return CHIP_ERROR_NOT_IMPLEMENTED;
	}

	void ConnectivityManagerImpl::_OnWiFiScanDone()
	{
	// CHIP_ERROR_NOT_IMPLEMENTED
	}

	void ConnectivityManagerImpl::_OnWiFiStationProvisionChange()
	{
	// Schedule a call to the DriveStationState method to adjust the station state as needed.
	ChipLogProgress(DeviceLayer, "_ON WIFI PROVISION CHANGE");
	DeviceLayer::SystemLayer().ScheduleWork(DriveStationState, NULL);
	}

	// == == == == == == == == == == ConnectivityManager Private Methods == == == == == == == == == ==

	void ConnectivityManagerImpl::DriveStationState()
	{
	CHIP_ERROR err = CHIP_NO_ERROR;
	sl_status_t serr;
	bool stationConnected;

	// Refresh the current station mode.
	GetWiFiStationMode();

	// If the station interface is NOT under application control...
	if (mWiFiStationMode != kWiFiStationMode_ApplicationControlled)
	{
	// Ensure that the WFX is started.
	if ((serr = wfx_wifi_start()) != SL_STATUS_OK)
	{
	ChipLogError(DeviceLayer, "wfx_wifi_start() failed: %s", chip::ErrorStr(err));
	return;
	}
	// Ensure that station mode is enabled in the WFX WiFi layer.
	wfx_enable_sta_mode();
	}

	stationConnected = wfx_is_sta_connected();

	// If the station interface is currently connected ...
	if (stationConnected)
	{
	// Advance the station state to Connected if it was previously NotConnected or
	// a previously initiated connect attempt succeeded.
	if (mWiFiStationState == kWiFiStationState_NotConnected \|\| mWiFiStationState == kWiFiStationState_Connecting_Succeeded)
	{
	ChangeWiFiStationState(kWiFiStationState_Connected);
	ChipLogProgress(DeviceLayer, "WiFi station interface connected");
	mLastStationConnectFailTime = System::Clock::kZero;
	OnStationConnected();
	}

	// If the WiFi station interface is no longer enabled, or no longer provisioned,
	// disconnect the station from the AP, unless the WiFi station mode is currently
	// under application control.
	#ifndef CHIP_ONNETWORK_PAIRING
	if (mWiFiStationMode != kWiFiStationMode_ApplicationControlled &&
	(mWiFiStationMode != kWiFiStationMode_Enabled \|\| !IsWiFiStationProvisioned()))
	{
	ChipLogProgress(DeviceLayer, "Disconnecting WiFi station interface");
	serr = wfx_sta_discon();
	if (serr != SL_STATUS_OK)
	{
	ChipLogError(DeviceLayer, "wfx_wifi_disconnect() failed: %s", chip::ErrorStr(err));
	}
	SuccessOrExit(serr);

	ChangeWiFiStationState(kWiFiStationState_Disconnecting);
	}
	#endif
	}
	// Otherwise the station interface is NOT connected to an AP, so...
	else
	{
	System::Clock::Timestamp now = System::SystemClock().GetMonotonicTimestamp();

	// Advance the station state to NotConnected if it was previously Connected or Disconnecting,
	// or if a previous initiated connect attempt failed.
	if (mWiFiStationState == kWiFiStationState_Connected \|\| mWiFiStationState == kWiFiStationState_Disconnecting \|\|
	mWiFiStationState == kWiFiStationState_Connecting_Failed)
	{
	WiFiStationState prevState = mWiFiStationState;
	ChangeWiFiStationState(kWiFiStationState_NotConnected);
	if (prevState != kWiFiStationState_Connecting_Failed)
	{
	ChipLogProgress(DeviceLayer, "WiFi station interface disconnected");
	mLastStationConnectFailTime = System::Clock::kZero;
	OnStationDisconnected();
	}
	else
	{
	mLastStationConnectFailTime = now;
	}
	}

	// If the WiFi station interface is now enabled and provisioned (and by implication,
	// not presently under application control), AND the system is not in the process of
	// scanning, then...
	if (mWiFiStationMode == kWiFiStationMode_Enabled && IsWiFiStationProvisioned())
	{
	// Initiate a connection to the AP if we haven't done so before, or if enough
	// time has passed since the last attempt.
	if (mLastStationConnectFailTime == System::Clock::kZero \|\|
	now >= mLastStationConnectFailTime + mWiFiStationReconnectInterval)
	{
	if (mWiFiStationState != kWiFiStationState_Connecting)
	{
	ChipLogProgress(DeviceLayer, "Attempting to connect WiFi");
	if ((serr = wfx_connect_to_ap()) != SL_STATUS_OK)
	{
	ChipLogError(DeviceLayer, "wfx_connect_to_ap() failed.");
	}
	SuccessOrExit(serr);

	ChangeWiFiStationState(kWiFiStationState_Connecting);
	}
	}

	// Otherwise arrange another connection attempt at a suitable point in the future.
	else
	{
	System::Clock::Timestamp timeToNextConnect = (mLastStationConnectFailTime + mWiFiStationReconnectInterval) - now;

	ChipLogProgress(DeviceLayer, "Next WiFi station reconnect in %" PRIu32 " ms",
	System::Clock::Milliseconds32(timeToNextConnect).count());

	ReturnOnFailure(DeviceLayer::SystemLayer().StartTimer(timeToNextConnect, DriveStationState, NULL));
	}
	}
	}

	exit:

	ChipLogProgress(DeviceLayer, "Done driving station state, nothing else to do...");
	// Kick-off any pending network scan that might have been deferred due to the activity
	// of the WiFi station.
	}

	void ConnectivityManagerImpl::OnStationConnected()
	{
	ChipDeviceEvent event;
	wfx_setup_ip6_link_local(SL_WFX_STA_INTERFACE);

	NetworkCommissioning::SlWiFiDriver::GetInstance().OnConnectWiFiNetwork();
	// Alert other components of the new state.
	event.Type = DeviceEventType::kWiFiConnectivityChange;
	event.WiFiConnectivityChange.Result = kConnectivity_Established;
	(void) PlatformMgr().PostEvent(&event);

	UpdateInternetConnectivityState();
	}

	void ConnectivityManagerImpl::OnStationDisconnected()
	{
	// TODO Invoke WARM to perform actions that occur when the WiFi station interface goes down.

	// Alert other components of the new state.
	ChipDeviceEvent event;
	event.Type = DeviceEventType::kWiFiConnectivityChange;
	event.WiFiConnectivityChange.Result = kConnectivity_Lost;
	(void) PlatformMgr().PostEvent(&event);

	UpdateInternetConnectivityState();
	}

	void ConnectivityManagerImpl::DriveStationState(::chip::System::Layer * aLayer, void * aAppState)
	{
	sInstance.DriveStationState();
	}

	void ConnectivityManagerImpl::ChangeWiFiStationState(WiFiStationState newState)
	{
	if (mWiFiStationState != newState)
	{
	ChipLogProgress(DeviceLayer, "WiFi station state change: %s -> %s", WiFiStationStateToStr(mWiFiStationState),
	WiFiStationStateToStr(newState));
	mWiFiStationState = newState;
	}
	}

	void ConnectivityManagerImpl::UpdateInternetConnectivityState(void)
	{
	bool haveIPv4Conn = false;
	bool haveIPv6Conn = false;
	bool hadIPv4Conn = mFlags.Has(ConnectivityFlags::kHaveIPv4InternetConnectivity);
	bool hadIPv6Conn = mFlags.Has(ConnectivityFlags::kHaveIPv6InternetConnectivity);
	IPAddress addr;

	// If the WiFi station is currently in the connected state...
	if (mWiFiStationState == kWiFiStationState_Connected)
	{
	#if CHIP_DEVICE_CONFIG_ENABLE_IPV4
	haveIPv4Conn = wfx_have_ipv4_addr(SL_WFX_STA_INTERFACE);
	#endif /* CHIP_DEVICE_CONFIG_ENABLE_IPV4 */
	haveIPv6Conn = wfx_have_ipv6_addr(SL_WFX_STA_INTERFACE);
	}

	// If the internet connectivity state has changed...
	if (haveIPv4Conn != hadIPv4Conn \|\| haveIPv6Conn != hadIPv6Conn)
	{
	// Update the current state.
	mFlags.Set(ConnectivityFlags::kHaveIPv4InternetConnectivity, haveIPv4Conn)
	.Set(ConnectivityFlags::kHaveIPv6InternetConnectivity, haveIPv6Conn);

	// Alert other components of the state change.
	ChipDeviceEvent event;
	event.Type = DeviceEventType::kInternetConnectivityChange;
	event.InternetConnectivityChange.IPv4 = GetConnectivityChange(hadIPv4Conn, haveIPv4Conn);
	event.InternetConnectivityChange.IPv6 = GetConnectivityChange(hadIPv6Conn, haveIPv6Conn);
	event.InternetConnectivityChange.ipAddress = addr;

	(void) PlatformMgr().PostEvent(&event);

	if (haveIPv4Conn != hadIPv4Conn)
	{
	ChipLogProgress(DeviceLayer, "%s Internet connectivity %s", "IPv4", (haveIPv4Conn) ? "ESTABLISHED" : "LOST");
	}

	if (haveIPv6Conn != hadIPv6Conn)
	{
	ChipLogProgress(DeviceLayer, "%s Internet connectivity %s", "IPv6", (haveIPv6Conn) ? "ESTABLISHED" : "LOST");
	}
	}
	}

	} // namespace DeviceLayer
	} // namespace chip