Add basic NXDN networking.

2026-02-05 06:05:42 +08:00 · 2018-01-15 21:03:34 +00:00
parent 1e03dfe5c1
commit 712cfc89c6
11 changed files with 390 additions and 11 deletions
--- a/NXDNNetwork.cpp
+++ b/NXDNNetwork.cpp
@@ -0,0 +1,166 @@
+/*
+ *   Copyright (C) 2009-2014,2016,2018 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 "NXDNDefines.h"
+#include "NXDNNetwork.h"
+#include "Defines.h"
+#include "Utils.h"
+#include "Log.h"
+
+#include <cstdio>
+#include <cassert>
+#include <cstring>
+
+const unsigned int BUFFER_LENGTH = 200U;
+
+CNXDNNetwork::CNXDNNetwork(const std::string& myAddress, unsigned int myPort, const std::string& gatewayAddress, unsigned int gatewayPort, const std::string& callsign, bool debug) :
+m_socket(myAddress, myPort),
+m_address(),
+m_port(gatewayPort),
+m_debug(debug),
+m_enabled(false),
+m_buffer(1000U, "NXDN Network"),
+m_pollTimer(1000U, 5U)
+{
+	m_address = CUDPSocket::lookup(gatewayAddress);
+}
+
+CNXDNNetwork::~CNXDNNetwork()
+{
+}
+
+bool CNXDNNetwork::open()
+{
+	LogMessage("Opening NXDN network connection");
+
+	if (m_address.s_addr == INADDR_NONE)
+		return false;
+
+	m_pollTimer.start();
+
+	return m_socket.open();
+}
+
+bool CNXDNNetwork::write(const unsigned char* src, const unsigned char* dest, const unsigned char* data, unsigned int count, bool end)
+{
+	assert(data != NULL);
+
+	unsigned char buffer[200U];
+
+	buffer[0U] = 'N';
+	buffer[1U] = 'X';
+	buffer[2U] = 'D';
+	buffer[3U] = 'N';
+	buffer[4U] = 'D';
+
+	buffer[5U] = end ? 0x01U : 0x00U;
+	buffer[5U] |= (count & 0x7FU) << 1;
+
+	::memcpy(buffer + 6U, data, NXDN_FRAME_LENGTH_BYTES);
+
+	if (m_debug)
+		CUtils::dump(1U, "NXDN Network Data Sent", buffer, 54U);
+
+	return m_socket.write(buffer, 54U, m_address, m_port);
+}
+
+bool CNXDNNetwork::writePoll()
+{
+	unsigned char buffer[20U];
+
+	buffer[0U] = 'N';
+	buffer[1U] = 'X';
+	buffer[2U] = 'D';
+	buffer[3U] = 'N';
+	buffer[4U] = 'P';
+
+	if (m_debug)
+		CUtils::dump(1U, "NXDN Network Poll Sent", buffer, 5U);
+
+	return m_socket.write(buffer, 5U, m_address, m_port);
+}
+
+void CNXDNNetwork::clock(unsigned int ms)
+{
+	m_pollTimer.clock(ms);
+	if (m_pollTimer.hasExpired()) {
+		writePoll();
+		m_pollTimer.start();
+	}
+
+	unsigned char buffer[BUFFER_LENGTH];
+
+	in_addr address;
+	unsigned int port;
+	int length = m_socket.read(buffer, BUFFER_LENGTH, address, port);
+	if (length <= 0)
+		return;
+
+	// Check if the data is for us
+	if (m_address.s_addr != address.s_addr || m_port != port) {
+		LogMessage("NXDN packet received from an invalid source, %08X != %08X and/or %u != %u", m_address.s_addr, address.s_addr, m_port, port);
+		return;
+	}
+
+	// Ignore incoming polls
+	if (::memcmp(buffer, "NXDNP", 5U) == 0)
+		return;
+
+	// Invalid packet type?
+	if (::memcmp(buffer, "NXDND", 5U) != 0)
+		return;
+
+	if (!m_enabled)
+		return;
+
+	if (m_debug)
+		CUtils::dump(1U, "NXDN Network Data Received", buffer, length);
+
+	m_buffer.addData(buffer, 54U);
+}
+
+unsigned int CNXDNNetwork::read(unsigned char* data)
+{
+	assert(data != NULL);
+
+	if (m_buffer.isEmpty())
+		return 0U;
+
+	m_buffer.getData(data, 54U);
+
+	return 155U;
+}
+
+void CNXDNNetwork::reset()
+{
+}
+
+void CNXDNNetwork::close()
+{
+	m_socket.close();
+
+	LogMessage("Closing NXDN network connection");
+}
+
+void CNXDNNetwork::enable(bool enabled)
+{
+	if (enabled && !m_enabled)
+		reset();
+
+	m_enabled = enabled;
+}