diff --git a/cpp/platform/impl/windows/BUILD b/cpp/platform/impl/windows/BUILD
index fe2dcdfa..79b155b1 100644
--- a/cpp/platform/impl/windows/BUILD
+++ b/cpp/platform/impl/windows/BUILD
@@ -12,6 +12,29 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+cc_library(
+    name = "types",
+    hdrs = [
+        "atomic_boolean.h",
+        "atomic_reference.h",
+    ],
+    deps = [
+        "//platform/api:types",
+    ],
+)
+
+cc_library(
+    name = "comm",
+    hdrs = [
+        "ble.h",
+    ],
+    visibility = ["//visibility:private"],
+    deps = [
+        "//platform/api:comm",
+        "//platform/base",
+    ],
+)
+
 cc_library(
     name = "crypto",
     testonly = True,
@@ -34,7 +57,9 @@ cc_test(
         "crypto_test.cc",
     ],
     deps = [
+        ":comm",
         ":crypto",
+        ":types",
         "//platform/api:types",
         "//testing/base/public:gunit_main",
     ],
diff --git a/cpp/platform/impl/windows/atomic_boolean.h b/cpp/platform/impl/windows/atomic_boolean.h
new file mode 100644
index 00000000..74239da4
--- /dev/null
+++ b/cpp/platform/impl/windows/atomic_boolean.h
@@ -0,0 +1,47 @@
+// Copyright 2020 Google LLC
+//
+// 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
+//
+//     https://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.
+
+#ifndef PLATFORM_IMPL_WINDOWS_ATOMIC_BOOLEAN_H_
+#define PLATFORM_IMPL_WINDOWS_ATOMIC_BOOLEAN_H_
+
+#include "platform/api/atomic_boolean.h"
+
+namespace location {
+namespace nearby {
+namespace windows {
+
+// A boolean value that may be updated atomically.
+class AtomicBoolean : public api::AtomicBoolean {
+ public:
+  // TODO(b/184975123): replace with real implementation.
+  ~AtomicBoolean() override = default;
+
+  // Atomically read and return current value.
+  bool Get() const override {
+    // TODO(b/184975123): replace with real implementation.
+    return false;
+  };
+
+  // Atomically exchange original value with a new one. Return previous value.
+  bool Set(bool value) override {
+    // TODO(b/184975123): replace with real implementation.
+    return false;
+  };
+};
+
+}  // namespace windows
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_IMPL_WINDOWS_ATOMIC_BOOLEAN_H_
diff --git a/cpp/platform/impl/windows/atomic_reference.h b/cpp/platform/impl/windows/atomic_reference.h
new file mode 100644
index 00000000..65cbaeb0
--- /dev/null
+++ b/cpp/platform/impl/windows/atomic_reference.h
@@ -0,0 +1,43 @@
+// Copyright 2020 Google LLC
+//
+// 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
+//
+//     https://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.
+
+#ifndef PLATFORM_IMPL_WINDOWS_ATOMIC_REFERENCE_H_
+#define PLATFORM_IMPL_WINDOWS_ATOMIC_REFERENCE_H_
+
+#include "platform/api/atomic_reference.h"
+
+namespace location {
+namespace nearby {
+namespace windows {
+
+// Type that allows 32-bit atomic reads and writes.
+class AtomicUint32 : public api::AtomicUint32 {
+ public:
+  // TODO(b/184975123): replace with real implementation.
+  ~AtomicUint32() override = default;
+
+  // Atomically reads and returns stored value.
+  // TODO(b/184975123): replace with real implementation.
+  std::uint32_t Get() const override = 0;
+
+  // Atomically stores value.
+  // TODO(b/184975123): replace with real implementation.
+  void Set(std::uint32_t value) override {}
+};
+
+}  // namespace windows
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_IMPL_WINDOWS_ATOMIC_REFERENCE_H_
diff --git a/cpp/platform/impl/windows/ble.h b/cpp/platform/impl/windows/ble.h
new file mode 100644
index 00000000..01122f33
--- /dev/null
+++ b/cpp/platform/impl/windows/ble.h
@@ -0,0 +1,155 @@
+// Copyright 2020 Google LLC
+//
+// 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
+//
+//     https://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.
+
+#ifndef PLATFORM_IMPL_WINDOWS_BLE_H_
+#define PLATFORM_IMPL_WINDOWS_BLE_H_
+
+#include "platform/api/ble.h"
+#include "platform/base/exception.h"
+#include "platform/base/input_stream.h"
+#include "platform/base/output_stream.h"
+
+namespace location {
+namespace nearby {
+namespace windows {
+
+// Opaque wrapper over a BLE peripheral. Must contain enough data about a
+// particular BLE device to connect to its GATT server.
+class BlePeripheral : public api::BlePeripheral {
+ public:
+  // TODO(b/184975123): replace with real implementation.
+  ~BlePeripheral() override = default;
+
+  // TODO(b/184975123): replace with real implementation.
+  std::string GetName() const override { return std::string{""}; }
+  // TODO(b/184975123): replace with real implementation.
+  ByteArray GetAdvertisementBytes(
+      const std::string& service_id) const override {
+    return ByteArray{};
+  }
+};
+
+class BleSocket : public api::BleSocket {
+ public:
+  // TODO(b/184975123): replace with real implementation.
+  ~BleSocket();
+
+  // Returns the InputStream of the BleSocket.
+  // On error, returned stream will report Exception::kIo on any operation.
+  //
+  // The returned object is not owned by the caller, and can be invalidated once
+  // the BleSocket object is destroyed.
+  // TODO(b/184975123): replace with real implementation.
+  InputStream& GetInputStream() override { return fake_input_stream_; }
+
+  // Returns the OutputStream of the BleSocket.
+  // On error, returned stream will report Exception::kIo on any operation.
+  //
+  // The returned object is not owned by the caller, and can be invalidated once
+  // the BleSocket object is destroyed.
+  // TODO(b/184975123): replace with real implementation.
+  OutputStream& GetOutputStream() override { return fake_output_stream_; }
+
+  // Conforms to the same contract as
+  // https://developer.android.com/reference/android/bluetooth/BluetoothSocket.html#close().
+  //
+  // Returns Exception::kIo on error, Exception::kSuccess otherwise.
+  // TODO(b/184975123): replace with real implementation.
+  Exception Close() override { return Exception{}; }
+
+  // Returns valid BlePeripheral pointer if there is a connection, and
+  // nullptr otherwise.
+  // TODO(b/184975123): replace with real implementation.
+  BlePeripheral* GetRemotePeripheral() override { return nullptr; }
+
+  // Unhooked InputStream & OutputStream for empty implementation.
+  // TODO(b/184975123): replace with real implementation.
+ private:
+  class FakeInputStream : public InputStream {
+    ~FakeInputStream() override = default;
+    ExceptionOr<ByteArray> Read(std::int64_t size) override {
+      return ExceptionOr<ByteArray>(Exception::kFailed);
+    }
+    Exception Close() override { return {.value = Exception::kFailed}; }
+  };
+  class FakeOutputStream : public OutputStream {
+    ~FakeOutputStream() override = default;
+
+    Exception Write(const ByteArray& data) override {
+      return {.value = Exception::kFailed};
+    }
+    Exception Flush() override { return {.value = Exception::kFailed}; }
+    Exception Close() override { return {.value = Exception::kFailed}; }
+  };
+  FakeInputStream fake_input_stream_;
+  FakeOutputStream fake_output_stream_;
+};
+
+// Container of operations that can be performed over the BLE medium.
+class BleMedium : public api::BleMedium {
+ public:
+  // TODO(b/184975123): replace with real implementation.
+  ~BleMedium() override = default;
+
+  // TODO(b/184975123): replace with real implementation.
+  bool StartAdvertising(
+      const std::string& service_id, const ByteArray& advertisement_bytes,
+      const std::string& fast_advertisement_service_uuid) override {
+    return false;
+  }
+  // TODO(b/184975123): replace with real implementation.
+  bool StopAdvertising(const std::string& service_id) override { return false; }
+
+  // Returns true once the BLE scan has been initiated.
+  // TODO(b/184975123): replace with real implementation.
+  bool StartScanning(const std::string& service_id,
+                     const std::string& fast_advertisement_service_uuid,
+                     DiscoveredPeripheralCallback callback) override {
+    return false;
+  }
+
+  // Returns true once BLE scanning for service_id is well and truly stopped;
+  // after this returns, there must be no more invocations of the
+  // DiscoveredPeripheralCallback passed in to StartScanning() for service_id.
+  // TODO(b/184975123): replace with real implementation.
+  bool StopScanning(const std::string& service_id) override { return false; }
+
+  // Returns true once BLE socket connection requests to service_id can be
+  // accepted.
+  // TODO(b/184975123): replace with real implementation.
+  bool StartAcceptingConnections(const std::string& service_id,
+                                 AcceptedConnectionCallback callback) override {
+    return false;
+  }
+  // TODO(b/184975123): replace with real implementation.
+  bool StopAcceptingConnections(const std::string& service_id) override {
+    return false;
+  }
+
+  // Connects to a BLE peripheral.
+  // On success, returns a new BleSocket.
+  // On error, returns nullptr.
+  // TODO(b/184975123): replace with real implementation.
+  std::unique_ptr<api::BleSocket> Connect(
+      api::BlePeripheral& peripheral, const std::string& service_id,
+      CancellationFlag* cancellation_flag) override {
+    return nullptr;
+  }
+};
+
+}  // namespace windows
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_IMPL_WINDOWS_BLE_H_