initial w5500 support

networkDevices/W5500Device.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include "NetworkDevice.h"
+#include <Ethernet.h>
+
+class W5500Device : public NetworkDevice
+{
+public:
+    explicit W5500Device(const String& hostname);
+    ~W5500Device();
+
+    virtual void initialize();
+    virtual void reconfigure();
+
+    virtual bool isConnected();
+
+    virtual PubSubClient *mqttClient();
+
+private:
+    void resetDevice();
+
+    EthernetClient* _ethClient = nullptr;
+    PubSubClient* _mqttClient = nullptr;
+};