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/packet/ethphyregpacket.h

@@ -0,0 +1,77 @@
+#ifndef __ETHPHYREGPACKET_H__
+#define __ETHPHYREGPACKET_H__
+
+#ifdef __cplusplus
+
+#include "icsneo/communication/message/ethphymessage.h"
+#include "icsneo/api/eventmanager.h"
+#include <cstdint>
+#include <memory>
+
+namespace icsneo
+{
+
+class Packetizer;
+class EthPhyMessage;
+
+typedef struct
+{
+	uint16_t numEntries;
+	uint8_t version;
+	uint8_t entryBytes;
+} PhyRegisterHeader_t;
+
+typedef struct
+{
+	uint8_t phyAddr;  //5 bits
+	uint8_t page;	  //8 bits
+	uint16_t regAddr; //5 bits
+	uint16_t regVal;
+} Clause22Message_t; //6 bytes
+
+typedef struct
+{
+	uint8_t port;	//5 bits
+	uint8_t device; //5 bits
+	uint16_t regAddr;
+	uint16_t regVal;
+} Clause45Message_t; //6 bytes
+
+typedef struct
+{
+	union
+	{
+		struct
+		{
+			uint16_t Enabled : 1;
+			uint16_t WriteEnable : 1;
+			uint16_t Clause45Enable : 1;
+			uint16_t reserved : 9;
+			uint16_t version : 4;
+		};
+		uint16_t flags;
+	};
+
+	union
+	{
+		Clause22Message_t clause22;
+		Clause45Message_t clause45;
+	};
+} PhyRegisterPacket_t;
+
+static constexpr size_t MaxPhyEntries = 128u;
+static constexpr size_t MaxBytesPhyEntries = MaxPhyEntries * sizeof(PhyRegisterHeader_t);
+static constexpr uint8_t PhyPacketVersion = 1u;
+static constexpr uint8_t FiveBits = 0x1Fu;
+
+struct HardwareEthernetPhyRegisterPacket
+{
+	static std::shared_ptr<EthPhyMessage> DecodeToMessage(const std::vector<uint8_t>& bytestream, const device_eventhandler_t& report);
+	static bool EncodeFromMessage(const EthPhyMessage& message, std::vector<uint8_t>& bytestream, const device_eventhandler_t& report);
+};
+
+}
+
+#endif //__cplusplus
+
+#endif