Finish off the UDP Controller and more clean-ups.

NullController.h

@@ -0,0 +1,40 @@
+/*
+*   Copyright (C) 2021 by Jonathan Naylor G4KLX
+*
+*   This program is free software; you can redistribute it and/or modify
+*   it under the terms of the GNU General Public License as published by
+*   the Free Software Foundation; either version 2 of the License, or
+*   (at your option) any later version.
+*
+*   This program is distributed in the hope that it will be useful,
+*   but WITHOUT ANY WARRANTY; without even the implied warranty of
+*   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*   GNU General Public License for more details.
+*
+*   You should have received a copy of the GNU General Public License
+*   along with this program; if not, write to the Free Software
+*   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifndef NullController_H
+#define NullController_H
+
+#include "MMDVMModemPort.h"
+
+class CNullController : public IMMDVMModemPort {
+public:
+	CNullController();
+	virtual ~CNullController();
+
+	virtual bool open();
+
+	virtual int read(unsigned char* buffer, unsigned int length);
+
+	virtual int write(const unsigned char* buffer, unsigned int length);
+
+	virtual void close();
+
+private:
+};
+
+#endif