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sdrangel/plugins/channelrx/demodadsb/adsbdemodworker.cpp

198 lines
6.1 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2020 Jon Beniston, M7RCE //
// Copyright (C) 2020 Edouard Griffiths, F4EXB //
// //
// 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 as version 3 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 V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#include <QDebug>
#include <QTcpServer>
#include <QTcpSocket>
#include <QEventLoop>
#include <QTimer>
#include "adsbdemodworker.h"
#include "adsbdemodreport.h"
MESSAGE_CLASS_DEFINITION(ADSBDemodWorker::MsgConfigureADSBDemodWorker, Message)
ADSBDemodWorker::ADSBDemodWorker() :
m_running(false),
m_mutex(QMutex::Recursive)
{
connect(&m_heartbeatTimer, SIGNAL(timeout()), this, SLOT(heartbeat()));
connect(&m_socket, SIGNAL(readyRead()),this, SLOT(recv()));
}
ADSBDemodWorker::~ADSBDemodWorker()
{
m_inputMessageQueue.clear();
}
void ADSBDemodWorker::reset()
{
QMutexLocker mutexLocker(&m_mutex);
m_inputMessageQueue.clear();
}
bool ADSBDemodWorker::startWork()
{
QMutexLocker mutexLocker(&m_mutex);
connect(&m_inputMessageQueue, SIGNAL(messageEnqueued()), this, SLOT(handleInputMessages()));
m_heartbeatTimer.start(60*1000);
m_running = true;
return m_running;
}
void ADSBDemodWorker::stopWork()
{
QMutexLocker mutexLocker(&m_mutex);
m_heartbeatTimer.stop();
disconnect(&m_inputMessageQueue, SIGNAL(messageEnqueued()), this, SLOT(handleInputMessages()));
m_running = false;
}
void ADSBDemodWorker::handleInputMessages()
{
Message* message;
while ((message = m_inputMessageQueue.pop()) != nullptr)
{
if (handleMessage(*message)) {
delete message;
}
}
}
bool ADSBDemodWorker::handleMessage(const Message& message)
{
if (MsgConfigureADSBDemodWorker::match(message))
{
QMutexLocker mutexLocker(&m_mutex);
MsgConfigureADSBDemodWorker& cfg = (MsgConfigureADSBDemodWorker&) message;
applySettings(cfg.getSettings(), cfg.getForce());
return true;
}
else if (ADSBDemodReport::MsgReportADSB::match(message))
{
ADSBDemodReport::MsgReportADSB& report = (ADSBDemodReport::MsgReportADSB&) message;
handleADSB(report.getData(), report.getDateTime(), report.getPreambleCorrelationOnes());
return true;
}
else
{
return false;
}
}
void ADSBDemodWorker::applySettings(const ADSBDemodSettings& settings, bool force)
{
qDebug() << "ADSBDemodWorker::applySettings:"
<< " m_beastEnabled: " << settings.m_beastEnabled
<< " m_beastHost: " << settings.m_beastHost
<< " m_beastPort: " << settings.m_beastPort
<< " force: " << force;
if ((settings.m_beastEnabled != m_settings.m_beastEnabled)
|| (settings.m_beastHost != m_settings.m_beastHost)
|| (settings.m_beastPort != m_settings.m_beastPort) || force)
{
// Close any existing connection
if (m_socket.isOpen())
m_socket.close();
// Open connection
if (settings.m_beastEnabled)
m_socket.connectToHost(settings.m_beastHost, settings.m_beastPort);
}
m_settings = settings;
}
void ADSBDemodWorker::recv()
{
// Not expecting to receving anything from server
qDebug() << "ADSBDemodWorker::recv";
qDebug() << m_socket.readAll();
}
void ADSBDemodWorker::send(const char *data, int length)
{
if (m_settings.m_beastEnabled)
{
// Reopen connection if it was lost
if (!m_socket.isOpen())
m_socket.connectToHost(m_settings.m_beastHost, m_settings.m_beastPort);
// Send data
m_socket.write(data, length);
}
}
#define BEAST_ESC 0x1a
char *ADSBDemodWorker::escape(char *p, char c)
{
*p++ = c;
if (c == BEAST_ESC)
*p++ = BEAST_ESC;
return p;
}
// Forward ADS-B data in Beast binary format to specified server
// See: https://wiki.jetvision.de/wiki/Mode-S_Beast:Data_Output_Formats
void ADSBDemodWorker::handleADSB(QByteArray data, const QDateTime dateTime, float correlation)
{
char beastBinary[2+6*2+1*2+14*2];
int length;
char *p = beastBinary;
qint64 timestamp;
unsigned char signalStrength;
timestamp = dateTime.toMSecsSinceEpoch();
if (correlation > 255)
signalStrength = 255;
if (correlation < 1)
signalStrength = 1;
else
signalStrength = (unsigned char)correlation;
*p++ = BEAST_ESC;
*p++ = '3'; // Mode-S long
p = escape(p, timestamp >> 56); // Big-endian timestamp
p = escape(p, timestamp >> 48);
p = escape(p, timestamp >> 32);
p = escape(p, timestamp >> 24);
p = escape(p, timestamp >> 16);
p = escape(p, timestamp >> 8);
p = escape(p, timestamp);
p = escape(p, signalStrength); // Signal strength
for (int i = 0; i < data.length(); i++) // ADS-B data
p = escape(p, data[i]);
length = p - beastBinary;
send(beastBinary, length);
}
// Periodically send heartbeat to keep connection alive
void ADSBDemodWorker::heartbeat()
{
const char heartbeat[] = {BEAST_ESC, '1', 0, 0, 0, 0, 0, 0, 0, 0, 0}; // Mode AC packet
send(heartbeat, sizeof(heartbeat));
}