hyperion.ng/libsrc/leddevice/ProviderUdp.cpp

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// STL includes
#include <cstring>
#include <cstdio>
#include <iostream>
#include <exception>
// Linux includes
#include <fcntl.h>
#include <sys/ioctl.h>
#include <QStringList>
#include <QUdpSocket>
#include <QHostInfo>
// Local Hyperion includes
#include "ProviderUdp.h"
ProviderUdp::ProviderUdp()
: LedDevice()
, _LatchTime_ns(-1)
, _port(0)
{
_udpSocket = new QUdpSocket();
}
ProviderUdp::~ProviderUdp()
{
_udpSocket->close();
}
bool ProviderUdp::setConfig(const Json::Value &deviceConfig, int defaultLatchTime, int defaultPort, std::string defaultHost)
{
QString host = QString::fromStdString(deviceConfig.get("host",defaultHost).asString());
if (_address.setAddress(host) )
{
Debug( _log, "Successfully parsed %s as an ip address.", deviceConfig["host"].asString().c_str());
}
else
{
Debug( _log, "Failed to parse %s as an ip address.", deviceConfig["host"].asString().c_str());
QHostInfo info = QHostInfo::fromName(host);
if (info.addresses().isEmpty())
{
Debug( _log, "Failed to parse %s as a hostname.", deviceConfig["host"].asString().c_str());
throw std::runtime_error("invalid target address");
}
Debug( _log, "Successfully parsed %s as a hostname.", deviceConfig["host"].asString().c_str());
_address = info.addresses().first();
}
_port = deviceConfig.get("port", defaultPort).asUInt();
if ( _port<=0 || _port > 65535)
{
throw std::runtime_error("invalid target port");
}
Debug( _log, "UDP using %s:%d", _address.toString().toStdString().c_str() , _port );
_LatchTime_ns = deviceConfig.get("latchtime", defaultLatchTime).asInt();
return true;
}
int ProviderUdp::open()
{
QHostAddress localAddress = QHostAddress::Any;
quint16 localPort = 0;
WarningIf( !_udpSocket->bind(localAddress, localPort), _log, "Could not bind local address: %s", strerror(errno));
return 0;
}
int ProviderUdp::writeBytes(const unsigned size, const uint8_t * data)
{
qint64 retVal = _udpSocket->writeDatagram((const char *)data,size,_address,_port);
if (retVal >= 0 && _LatchTime_ns > 0)
{
// The 'latch' time for latching the shifted-value into the leds
timespec latchTime;
latchTime.tv_sec = 0;
latchTime.tv_nsec = _LatchTime_ns;
// Sleep to latch the leds (only if write succesfull)
nanosleep(&latchTime, NULL);
}
else
{
Warning( _log, "Error sending: %s", strerror(errno));
}
return retVal;
}