Refactor for a central include directory

include/icsneo/communication/message/serialnumbermessage.h

@@ -0,0 +1,24 @@
+#ifndef __SERIALNUMBERMESSAGE_H_
+#define __SERIALNUMBERMESSAGE_H_
+
+#include "icsneo/communication/message/main51message.h"
+#include "icsneo/communication/command.h"
+#include <string>
+
+namespace icsneo {
+
+// The response for Command::RequestSerialNumber
+class SerialNumberMessage : public Main51Message {
+public:
+	SerialNumberMessage() : Main51Message() { command = Command::RequestSerialNumber; }
+	virtual ~SerialNumberMessage() = default;
+	std::string deviceSerial;
+	uint8_t macAddress[6]; // This might be all zeros even if `hasMacAddress` is true
+	bool hasMacAddress = false; // The message might not actually be long enough to contain a MAC address, in which case we mark this
+	uint8_t pcbSerial[16];
+	bool hasPCBSerial = false;
+};
+
+}
+
+#endif