Added registration.

Currently doesn't return any valid result, hence host believes device
failed to register, however, insecure storage of keys does occur.

Packet.hpp

@@ -0,0 +1,43 @@
+#pragma once
+#include <cstdint>
+#include <memory>
+#include <array>
+#include "Constants.hpp"
+
+struct Packet
+{
+	uint32_t            cid;
+	uint8_t buf[packetSize];
+
+	protected:
+		Packet() = default;
+		virtual void writePacket();
+
+	public:
+		static std::shared_ptr<Packet> getPacket();
+		virtual ~Packet() = default;
+};
+
+struct InitPacket : Packet
+{
+	uint8_t                             cmd;
+	uint8_t                             bcnth;
+	uint8_t                             bcntl;
+	std::array<uint8_t, packetSize - 7> data{};
+
+	public:
+		InitPacket() = default;
+		static std::shared_ptr<InitPacket> getPacket(const uint32_t rCID, const uint8_t rCMD);
+		void writePacket() override;
+};
+
+struct ContPacket : Packet
+{
+	uint8_t                             seq;
+	std::array<uint8_t, packetSize - 5> data{};
+
+	public:
+		ContPacket() = default;
+		static std::shared_ptr<ContPacket> getPacket(const uint32_t rCID, const uint8_t rSeq);
+		void writePacket() override;
+};