NXDNClients/NXDNGateway/APRSWriter.cpp

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2018-05-22 15:43:04 -04:00
/*
* Copyright (C) 2010-2014,2016,2017,2018 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 "APRSWriter.h"
#include <cstdio>
#include <cassert>
#include <cstring>
#include <cmath>
CAPRSWriter::CAPRSWriter(const std::string& callsign, const std::string& suffix, const std::string& password, const std::string& address, unsigned int port) :
m_thread(NULL),
m_enabled(false),
m_idTimer(1000U, 20U * 60U), // 20 minutes
m_callsign(callsign),
m_txFrequency(0U),
m_rxFrequency(0U),
m_latitude(0.0F),
m_longitude(0.0F),
m_height(0),
m_desc()
{
assert(!callsign.empty());
assert(!password.empty());
assert(!address.empty());
assert(port > 0U);
if (!suffix.empty()) {
m_callsign.append("-");
m_callsign.append(suffix.substr(0U, 1U));
}
m_thread = new CAPRSWriterThread(m_callsign, password, address, port);
}
CAPRSWriter::~CAPRSWriter()
{
}
void CAPRSWriter::setInfo(unsigned int txFrequency, unsigned int rxFrequency, float latitude, float longitude, int height, const std::string& desc)
{
m_txFrequency = txFrequency;
m_rxFrequency = rxFrequency;
m_latitude = latitude;
m_longitude = longitude;
m_height = height;
m_desc = desc;
}
bool CAPRSWriter::open()
{
m_idTimer.start();
return m_thread->start();
}
void CAPRSWriter::write(const char* data)
{
assert(data != NULL);
m_thread->write(data);
}
void CAPRSWriter::clock(unsigned int ms)
{
m_idTimer.clock(ms);
if (m_idTimer.hasExpired()) {
sendIdFrames();
m_idTimer.start();
}
}
void CAPRSWriter::close()
{
m_thread->stop();
}
void CAPRSWriter::sendIdFrames()
{
if (!m_thread->isConnected())
return;
// Default values aren't passed on
if (m_latitude == 0.0F && m_longitude == 0.0F)
return;
char desc[200U];
if (m_txFrequency != 0U) {
float offset = float(int(m_rxFrequency) - int(m_txFrequency)) / 1000000.0F;
::sprintf(desc, "MMDVM Voice %.5LfMHz %c%.4lfMHz%s%s",
(long double)(m_txFrequency) / 1000000.0F,
offset < 0.0F ? '-' : '+',
::fabs(offset), m_desc.empty() ? "" : ", ", m_desc.c_str());
} else {
::sprintf(desc, "MMDVM Voice%s%s", m_desc.empty() ? "" : ", ", m_desc.c_str());
}
const char* band = "4m";
if (m_txFrequency >= 1200000000U)
band = "1.2";
else if (m_txFrequency >= 420000000U)
band = "440";
else if (m_txFrequency >= 144000000U)
band = "2m";
else if (m_txFrequency >= 50000000U)
band = "6m";
else if (m_txFrequency >= 28000000U)
band = "10m";
double tempLat = ::fabs(m_latitude);
double tempLong = ::fabs(m_longitude);
double latitude = ::floor(tempLat);
double longitude = ::floor(tempLong);
latitude = (tempLat - latitude) * 60.0 + latitude * 100.0;
longitude = (tempLong - longitude) * 60.0 + longitude * 100.0;
char lat[20U];
::sprintf(lat, "%07.2lf", latitude);
char lon[20U];
::sprintf(lon, "%08.2lf", longitude);
std::string server = m_callsign;
size_t pos = server.find_first_of('-');
if (pos == std::string::npos)
server.append("-S");
else
server.append("S");
char output[500U];
::sprintf(output, "%s>APDG04,TCPIP*,qAC,%s:!%s%cD%s%c&/A=%06.0f%s %s",
m_callsign.c_str(), server.c_str(),
lat, (m_latitude < 0.0F) ? 'S' : 'N',
lon, (m_longitude < 0.0F) ? 'W' : 'E',
float(m_height) * 3.28F, band, desc);
m_thread->write(output);
m_idTimer.start();
}