Rangefinder2D_nws_ros.cpp

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/*
 * SPDX-FileCopyrightText: 2006-2023 Istituto Italiano di Tecnologia (IIT)
 * SPDX-License-Identifier: LGPL-2.1-or-later
 */
 
#define _USE_MATH_DEFINES
 
#include "Rangefinder2D_nws_ros.h"
 
#include <yarp/os/LogStream.h>
 
#include <yarp/dev/ControlBoardInterfaces.h>
 
#include <cmath>
#include <sstream>
 
using namespace yarp::sig;
using namespace yarp::dev;
using namespace yarp::os;
 
YARP_LOG_COMPONENT(RANGEFINDER2D_NWS_ROS, "yarp.devices.rangefinder2D_nws_ros")
 
 
 
Rangefinder2D_nws_ros::Rangefinder2D_nws_ros() : PeriodicThread(DEFAULT_THREAD_PERIOD),
    node(nullptr),
    msgCounter(0),
    sens_p(nullptr),
    _period(DEFAULT_THREAD_PERIOD),
    minAngle(0),
    maxAngle(0),
    minDistance(0),
    maxDistance(0),
    resolution(0)
{}
 
Rangefinder2D_nws_ros::~Rangefinder2D_nws_ros()
{
    sens_p = nullptr;
}
 
bool Rangefinder2D_nws_ros::checkROSParams(yarp::os::Searchable &config)
{
    // check for ROS_nodeName parameter
    if (!config.check("node_name"))
    {
        yCError(RANGEFINDER2D_NWS_ROS) << "Cannot find node_name parameter, mandatory when using ROS message";
        return false;
    }
    nodeName = config.find("node_name").asString();
    if(nodeName[0] != '/'){
        yCError(RANGEFINDER2D_NWS_ROS) << "node_name must begin with an initial /";
        return false;
    }
    yCInfo(RANGEFINDER2D_NWS_ROS) << "node_name is " << nodeName;
 
    // check for ROS_topicName parameter
    if (!config.check("topic_name"))
    {
        yCError(RANGEFINDER2D_NWS_ROS) << "Cannot find topic_name parameter";
        return false;
    }
    topicName = config.find("topic_name").asString();
    if(topicName[0] != '/'){
        yCError(RANGEFINDER2D_NWS_ROS) << "topic_name parameter must begin with an initial /";
        return false;
    }
    yCInfo(RANGEFINDER2D_NWS_ROS) << "topic_name is " << topicName;
 
    // check for frame_id parameter
    if (!config.check("frame_id"))
    {
        yCError(RANGEFINDER2D_NWS_ROS) << "Cannot find frame_id parameter, mandatory when using ROS message";
        return false;
    }
    frame_id = config.find("frame_id").asString();
    yCInfo(RANGEFINDER2D_NWS_ROS) << "Frame_id is " << frame_id;
 
    return true;
}
 
bool Rangefinder2D_nws_ros::initialize_ROS()
{
    node = new yarp::os::Node(nodeName);   // add a ROS node
    if (node == nullptr)
    {
        yCError(RANGEFINDER2D_NWS_ROS) << " opening " << nodeName << " Node, check your yarp-ROS network configuration\n";
        return false;
    }
    if (!publisherPort.topic(topicName))
    {
        yCError(RANGEFINDER2D_NWS_ROS) << " opening " << topicName << " Topic, check your yarp-ROS network configuration\n";
        return false;
    }
    return true;
}
 
bool Rangefinder2D_nws_ros::attach(yarp::dev::PolyDriver* driver)
{
    if (driver->isValid())
    {
        driver->view(sens_p);
    }
 
    if (nullptr == sens_p)
    {
        yCError(RANGEFINDER2D_NWS_ROS, "View of IRangeFinder2DInterface failed. Attach failed.");
        return false;
    }
    attach(sens_p);
 
    if(!sens_p->getDistanceRange(minDistance, maxDistance))
    {
        yCError(RANGEFINDER2D_NWS_ROS) << "Laser device does not provide min & max distance range.";
        return false;
    }
 
    if(!sens_p->getScanLimits(minAngle, maxAngle))
    {
        yCError(RANGEFINDER2D_NWS_ROS) << "Laser device does not provide min & max angle scan range.";
        return false;
    }
 
    if (!sens_p->getHorizontalResolution(resolution))
    {
        yCError(RANGEFINDER2D_NWS_ROS) << "Laser device does not provide horizontal resolution ";
        return false;
    }
 
    PeriodicThread::setPeriod(_period);
    return PeriodicThread::start();
}
 
void Rangefinder2D_nws_ros::attach(yarp::dev::IRangefinder2D *s)
{
    sens_p = s;
}
 
bool Rangefinder2D_nws_ros::detach()
{
    if (PeriodicThread::isRunning())
    {
        PeriodicThread::stop();
    }
    sens_p = nullptr;
    return true;
}
 
bool Rangefinder2D_nws_ros::threadInit()
{
    return true;
}
 
bool Rangefinder2D_nws_ros::open(yarp::os::Searchable &config)
{
    Property params;
    params.fromString(config.toString());
 
    if (!config.check("period"))
    {
        yCError(RANGEFINDER2D_NWS_ROS) << "Rangefinder2DWrapper: missing 'period' parameter. Check you configuration file\n";
        return false;
    }
    _period = config.find("period").asFloat64();
 
    checkROSParams(config);
 
    // call ROS node/topic initialization, if needed
    if (!initialize_ROS())
    {
        return false;
    }
 
    return true;
}
 
 
void Rangefinder2D_nws_ros::threadRelease()
{
    publisherPort.close();
}
 
void Rangefinder2D_nws_ros::run()
{
    if (sens_p!=nullptr)
    {
        bool ret = true;
        IRangefinder2D::Device_status status;
        yarp::sig::Vector ranges;
        double synchronized_timestamp=0;
        ret &= sens_p->getRawData(ranges, &synchronized_timestamp);
        ret &= sens_p->getDeviceStatus(status);
 
        if (ret)
        {
            if (std::isnan(synchronized_timestamp) == false)
            {
                lastStateStamp.update(synchronized_timestamp);
            }
            else
            {
                lastStateStamp.update(yarp::os::Time::now());
            }
 
            int ranges_size = ranges.size();
 
            // publish ROS topic if required
            yarp::rosmsg::sensor_msgs::LaserScan &rosData = publisherPort.prepare();
            rosData.header.seq = msgCounter++;
            rosData.header.stamp = lastStateStamp.getTime();
            rosData.header.frame_id = frame_id;
 
            rosData.angle_min = minAngle * M_PI / 180.0;
            rosData.angle_max = maxAngle * M_PI / 180.0;
            rosData.angle_increment = resolution * M_PI / 180.0;
            rosData.time_increment = 0;             // all points in a single scan are considered took at the very same time
            rosData.scan_time = getPeriod();        // time elapsed between two successive readings
            rosData.range_min = minDistance;
            rosData.range_max = maxDistance;
            rosData.ranges.resize(ranges_size);
            rosData.intensities.resize(ranges_size);
 
            for (int i = 0; i < ranges_size; i++)
            {
                // in yarp, NaN is used when a scan value is missing. For example when the angular range of the rangefinder is smaller than 360.
                // is ros, NaN is not used. Hence this check replaces NaN with inf.
                if (std::isnan(ranges[i]))
                {
                    rosData.ranges[i] = std::numeric_limits<double>::infinity();
                    rosData.intensities[i] = 0.0;
                }
                else
                {
                    rosData.ranges[i] = ranges[i];
                    rosData.intensities[i] = 0.0;
                }
            }
            publisherPort.write();
        }
        else
        {
            yCError(RANGEFINDER2D_NWS_ROS, "Rangefinder2D_nws_ros: %s: Sensor returned error", topicName.c_str());
        }
    }
}
 
bool Rangefinder2D_nws_ros::close()
{
    yCTrace(RANGEFINDER2D_NWS_ROS, "Rangefinder2DWrapperROSROS::Close");
    if (PeriodicThread::isRunning())
    {
        PeriodicThread::stop();
    }
    if(node!=nullptr) {
        node->interrupt();
        delete node;
        node = nullptr;
    }
 
    detach();
    return true;
}