Pause Bluetooth classic discovery

PiperOrigin-RevId: 647333108

internal/platform/BUILD

@@ -209,6 +209,7 @@ cc_library(
         "@com_google_absl//absl/container:flat_hash_set",
         "@com_google_absl//absl/status",
         "@com_google_absl//absl/strings",
+        "@com_google_absl//absl/strings:str_format",
         "@com_google_absl//absl/time",
         "@com_google_absl//absl/types:optional",
     ],

internal/platform/implementation/g3/ble_v2.cc

@@ -160,6 +160,8 @@ Exception BleV2ServerSocket::DoClose() {
 BleV2Medium::BleV2Medium(api::BluetoothAdapter& adapter)
     : adapter_(static_cast<BluetoothAdapter*>(&adapter)) {
   adapter_->SetBleV2Medium(this);
+  is_extended_advertisements_available_ =
+      MediumEnvironment::Instance().IsBleExtendedAdvertisementsAvailable();
 
   MediumEnvironment::Instance().RegisterBleV2Medium(*this, &peripheral_);
 }
@@ -326,7 +328,7 @@ std::unique_ptr<api::ble_v2::GattClient> BleV2Medium::ConnectToGattServer(
 }
 
 bool BleV2Medium::IsExtendedAdvertisementsAvailable() {
-  return MediumEnvironment::Instance().IsBleExtendedAdvertisementsAvailable();
+  return is_extended_advertisements_available_;
 }
 
 bool BleV2Medium::GetRemotePeripheral(const std::string& mac_address,

internal/platform/implementation/g3/ble_v2.h

@@ -332,6 +332,7 @@ class BleV2Medium : public api::ble_v2::BleMedium {
       ABSL_GUARDED_BY(mutex_);
   absl::flat_hash_set<std::pair<Uuid, std::uint32_t>>
       scanning_internal_session_ids_ ABSL_GUARDED_BY(mutex_);
+  bool is_extended_advertisements_available_ = false;
 };
 
 }  // namespace g3

internal/platform/medium_environment.cc

@@ -24,9 +24,11 @@
 
 #include "absl/container/flat_hash_set.h"
 #include "absl/status/status.h"
+#include "absl/strings/str_format.h"
 #include "absl/strings/string_view.h"
 #include "absl/time/time.h"
 #include "absl/types/optional.h"
+#include "internal/platform/borrowable.h"
 #include "internal/platform/byte_array.h"
 #include "internal/platform/count_down_latch.h"
 #include "internal/platform/feature_flags.h"
@@ -35,6 +37,7 @@
 #include "internal/platform/implementation/bluetooth_adapter.h"
 #include "internal/platform/implementation/bluetooth_classic.h"
 #include "internal/platform/implementation/wifi_direct.h"
+#include "internal/platform/implementation/wifi_hotspot.h"
 #include "internal/platform/implementation/wifi_lan.h"
 #include "internal/platform/logging.h"
 #include "internal/platform/mutex_lock.h"
@@ -1153,7 +1156,7 @@ std::optional<FakeClock*> MediumEnvironment::GetSimulatedClock() {
   if (simulated_clock_) {
     return std::optional<FakeClock*>(simulated_clock_.get());
   }
-  return absl::nullopt;
+  return std::nullopt;
 }
 
 void MediumEnvironment::RegisterGattServer(