Auto hotspot implementation

src/HotspotManager.hpp

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+// Copyright (c) 2024 Robin Davies
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#pragma once
+#include <memory>
+#include <functional>
+#include <chrono>
+
+namespace pipedal {
+
+    class HotspotManager {
+        
+        // no move, no delete.
+        HotspotManager(const HotspotManager&) = delete;
+        HotspotManager(HotspotManager&&) = delete;
+        HotspotManager & operator=(const HotspotManager&) = delete;
+        HotspotManager & operator=(const HotspotManager&&) = delete;
+
+    protected: 
+
+        HotspotManager() {} // use Create().
+    public:
+        using clock = std::chrono::steady_clock;
+        
+        using ptr = std::unique_ptr<HotspotManager>;
+
+        static ptr Create();
+
+        virtual ~HotspotManager() noexcept { }
+
+        virtual void Open() = 0;
+        virtual void Reload() = 0;
+        virtual void Close() = 0;
+
+        using NetworkChangingListener = std::function<void(bool ethernetConnected,bool hotspotEnabled)>;
+
+        virtual void SetNetworkChangingListener(NetworkChangingListener &&listener) = 0;
+
+        using PostHandle = uint64_t;
+        using PostCallback = std::function<void()>;
+
+        virtual PostHandle Post(PostCallback&&fn) = 0;
+        virtual PostHandle PostDelayed(const clock::duration&delay,PostCallback&&fn) = 0;
+        virtual bool CancelPost(PostHandle handle) = 0;
+
+
+        template<class REP,class PERIOD> 
+        PostHandle PostDelayed(const std::chrono::duration<REP,PERIOD>&delay,PostCallback&&fn)
+        {
+            return PostDelayed(
+                std::chrono::duration_cast<clock::duration,REP,PERIOD>(delay),
+                std::move(fn));
+        }
+
+
+
+    };
+
+}