Add WifiLan validation check

PiperOrigin-RevId: 452402734

internal/platform/implementation/g3/wifi_lan.h

@@ -170,6 +170,9 @@ class WifiLanMedium : public api::WifiLanMedium {
   WifiLanMedium();
   ~WifiLanMedium() override;
 
+  // Check if a network connection to a primary router exist.
+  bool IsNetworkConnected() const override { return true; }
+
   // Starts WifiLan advertising.
   //
   // nsd_service_info - NsdServiceInfo data that's advertised through mDNS

internal/platform/implementation/ios/wifi_lan.h

@@ -139,6 +139,9 @@ class WifiLanMedium : public api::WifiLanMedium {
   WifiLanMedium(const WifiLanMedium&) = delete;
   WifiLanMedium& operator=(const WifiLanMedium&) = delete;
 
+  // Check if a network connection to a primary router exist.
+  bool IsNetworkConnected() const override { return true; }
+
   // api::WifiLanMedium:
   bool StartAdvertising(const NsdServiceInfo& nsd_service_info) override
       ABSL_LOCKS_EXCLUDED(mutex_);

internal/platform/implementation/wifi_lan.h

@@ -76,6 +76,9 @@ class WifiLanMedium {
  public:
   virtual ~WifiLanMedium() = default;
 
+  // Check if a network connection to a primary router exist.
+  virtual bool IsNetworkConnected() const = 0;
+
   // Starts WifiLan advertising.
   //
   // nsd_service_info - NsdServiceInfo data that's advertised through mDNS

internal/platform/implementation/windows/wifi_lan.h

@@ -218,6 +218,9 @@ class WifiLanMedium : public api::WifiLanMedium {
  public:
   ~WifiLanMedium() override = default;
 
+  // Check if a network connection to a primary router exist.
+  bool IsNetworkConnected() const override;
+
   // Starts to advertising
   bool StartAdvertising(const NsdServiceInfo& nsd_service_info) override;
 

internal/platform/implementation/windows/wifi_lan_medium.cc

@@ -36,6 +36,14 @@ namespace location {
 namespace nearby {
 namespace windows {
 
+bool WifiLanMedium::IsNetworkConnected() const {
+  // connection_profile will be null when there's no network adapter or
+  // connection to a network. For example, WiFi isn't connected to an AP/hotspot
+  // and ethernet isn't connected to a router/hub/switch.
+  auto connection_profile = NetworkInformation::GetInternetConnectionProfile();
+  return connection_profile != nullptr;
+}
+
 bool WifiLanMedium::StartAdvertising(const NsdServiceInfo& nsd_service_info) {
   absl::MutexLock lock(&mutex_);
 

internal/platform/wifi_lan.h

@@ -192,7 +192,15 @@ class WifiLanMedium {
     return impl_->GetDynamicPortRange();
   }
 
-  bool IsValid() const { return impl_ != nullptr; }
+  // Both SW and HW support WifiLan Medium
+  bool IsValid() const {
+    // When impl_ is not nullptr, it means platform layer SW is implemented for
+    // this Medium
+    if (impl_ == nullptr) return false;
+    // A network connection to a primary router exist, also implied that HW is
+    // exist and enabled
+    return impl_->IsNetworkConnected();
+  }
 
   api::WifiLanMedium& GetImpl() { return *impl_; }