Add remote control interface.

RemoteControl.cpp

@@ -0,0 +1,60 @@
+/*
+ *   Copyright (C) 2019 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.
+ */
+
+#include "RemoteControl.h"
+
+#include <cstdio>
+#include <cassert>
+
+const unsigned int BUFFER_LENGTH = 100U;
+
+CRemoteControl::CRemoteControl(unsigned int port) :
+m_socket(port)
+{
+	assert(port > 0U);
+}
+
+CRemoteControl::~CRemoteControl()
+{
+}
+
+bool CRemoteControl::open()
+{
+	return m_socket.open();
+}
+
+REMOTE_COMMAND CRemoteControl::getCommand()
+{
+	REMOTE_COMMAND command = RC_NONE;
+
+	unsigned char buffer[BUFFER_LENGTH];
+	in_addr address;
+	unsigned int port;
+	int ret = m_socket.read(buffer, BUFFER_LENGTH, address, port);
+	if (ret > 0) {
+		if (::memcmp(buffer, "0", 1U) == 0)
+			command = RC_FORCE_IDLE;
+	}
+	
+	return command;
+}
+
+void CRemoteControl::close()
+{
+	m_socket.close();
+}