* Add the missing files

Signed-off-by: Lo,Chin-Ran <chin-ran.lo@nxp.com>

src/wifipaf/BUILD.gn

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+# Copyright (c) 2024 Project CHIP Authors
+#
+# 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.
+
+import("//build_overrides/build.gni")
+import("//build_overrides/chip.gni")
+import("${chip_root}/src/platform/device.gni")
+
+if (chip_device_config_enable_wifipaf) {
+  static_library("wifipaf") {
+    output_name = "libWiFiPAFLayer"
+
+    sources = [
+      "WiFiPAFLayerDelegate.h",
+      "WiFiPAFLayer.cpp",
+      "WiFiPAFLayer.h"
+    ]
+
+    cflags = [ "-Wconversion" ]
+
+    public_deps = [
+      "${chip_root}/src/lib/core",
+      "${chip_root}/src/lib/support",
+    ]
+  }
+} else {
+  group("wifipaf") {
+  }
+}

src/wifipaf/WiFiPAFLayer.cpp

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+/*
+ *
+ *    Copyright (c) 2024 Project CHIP Authors
+ *
+ *    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
+ *      This file implements objects which provide an abstraction layer between
+ *      a platform's WiFiPAF implementation and the CHIP
+ *      stack.
+ *
+ */
+
+#include "WiFiPAFLayer.h"
+namespace chip {
+namespace WiFiPAF {
+
+void WiFiPAFLayer::OnWiFiPAFMessageReceived(System::PacketBufferHandle && msg)
+{
+    if (mWiFiPAFTransport != nullptr) {
+        mWiFiPAFTransport->OnWiFiPAFMessageReceived(std::move(msg));
+    }
+}
+
+void WiFiPAFLayer::SetWiFiPAFState(State state)
+{
+    mAppState = state;
+    return;
+}
+
+static WiFiPAFLayer sInstance;
+WiFiPAFLayer* WiFiPAFLayer::GetWiFiPAFLayer()
+{
+    return &sInstance;
+}
+
+} /* namespace WiFiPAF */
+} /* namespace chip */

src/wifipaf/WiFiPAFLayer.h

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+/*
+ *
+ *    Copyright (c) 2024 Project CHIP Authors
+ *
+ *    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.
+ */
+
+#pragma once
+
+#include <lib/core/CHIPError.h>
+#include <lib/support/DLLUtil.h>
+#include <system/SystemPacketBuffer.h>
+#include "WiFiPAFLayerDelegate.h"
+
+namespace chip {
+namespace WiFiPAF {
+/**
+*  The State of the Wi-Fi-PAF connection
+*
+*/
+enum class State
+{
+    kNotReady    = 0, /**< State before initialization. */
+    kInitialized = 1, /**< State after class is connected and ready. */
+    kConnected   = 2, /**< Endpoint connected. */
+};
+
+class DLL_EXPORT WiFiPAFLayer
+{
+public:
+    State mAppState = State::kNotReady;
+    WiFiPAFLayerDelegate * mWiFiPAFTransport = nullptr;
+
+    WiFiPAFLayer() = default;
+    static WiFiPAFLayer* GetWiFiPAFLayer();
+
+    void OnWiFiPAFMessageReceived(System::PacketBufferHandle && msg);
+    State GetWiFiPAFState() { return mAppState; };
+    void SetWiFiPAFState(State state);
+};
+
+} /* namespace WiFiPAF */
+} /* namespace chip */

src/wifipaf/WiFiPAFLayerDelegate.h

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+/*
+ *
+ *    Copyright (c) 2024 Project CHIP Authors
+ *
+ *    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
+ *      This file defines the interface for downcalls from WiFiPAFLayer
+ *      to a WiFiPAF transport.
+ */
+
+#pragma once
+
+#include <system/SystemPacketBuffer.h>
+
+namespace chip {
+namespace WiFiPAF {
+
+class WiFiPAFLayerDelegate
+{
+public:
+    virtual ~WiFiPAFLayerDelegate() = default;
+    virtual void OnWiFiPAFMessageReceived(System::PacketBufferHandle && msg) = 0;
+};
+
+} // namespace WiFiPAF
+} // namespace chip