Device: Implement Ethernet PHY MDIO Communication

The following fixups were added during the squash/merge:

Fix formatting in EthPhyMessage and EthPhyRegPacket
Device: Use std::make_shared when creating the EthPHYControl filter
Network: Create NetID String for EthPHYControl
EthPhyRegPacket: Constants in PascalCase

include/icsneo/communication/message/ethphymessage.h

@@ -0,0 +1,60 @@
+#ifndef __ETHPHYMESSAGE_H__
+#define __ETHPHYMESSAGE_H__
+
+#ifdef __cplusplus
+
+#include "icsneo/communication/packet/ethphyregpacket.h"
+#include "icsneo/communication/message/message.h"
+#include "icsneo/communication/packet.h"
+#include "icsneo/api/eventmanager.h"
+#include <vector>
+#include <memory>
+
+namespace icsneo {
+
+struct Clause22Message
+{
+	uint8_t phyAddr;
+	uint8_t page;
+	uint16_t regAddr;
+	uint16_t regVal;
+};
+
+struct Clause45Message
+{
+	uint8_t port;
+	uint8_t device;
+	uint16_t regAddr;
+	uint16_t regVal;
+};
+
+struct PhyMessage
+{
+	bool Enabled;
+	bool WriteEnable;
+	bool Clause45Enable;
+	uint8_t version;
+	union
+	{
+		Clause22Message clause22;
+		Clause45Message clause45;
+	};
+};
+
+//Internal message which provides an interface with device ethernet PHY registers,
+//with Clause22 and Clause45 message support
+class EthPhyMessage : public Message {
+public:
+	EthPhyMessage() : Message(Message::Type::EthernetPhyRegister) {}
+	bool appendPhyMessage(bool writeEnable, bool clause45, uint8_t phyAddrOrPort, uint8_t pageOrDevice, uint16_t regAddr, uint16_t regVal = 0x0000u, bool enabled = true);
+	bool appendPhyMessage(std::shared_ptr<PhyMessage> message);
+	size_t getMessageCount() const;
+
+	std::vector<std::shared_ptr<PhyMessage>> messages;
+};
+
+}
+
+#endif // __cplusplus
+
+#endif