CAbstractNavigator.cpp

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/* +---------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)               |
   |                          http://www.mrpt.org/                             |
   |                                                                           |
   | Copyright (c) 2005-2017, Individual contributors, see AUTHORS file        |
   | See: http://www.mrpt.org/Authors - All rights reserved.                   |
   | Released under BSD License. See details in http://www.mrpt.org/License    |
   +---------------------------------------------------------------------------+ */
 
#include "nav-precomp.h" // Precomp header
 
#include <mrpt/nav/reactive/CAbstractNavigator.h>
#include <mrpt/math/lightweight_geom_data.h>
#include <mrpt/utils/CConfigFileMemory.h>
#include <limits>
#include <typeinfo>
 
using namespace mrpt::nav;
using namespace std;
 
const double PREVIOUS_POSES_MAX_AGE = 20; // seconds
 
// Ctor: CAbstractNavigator::TargetInfo
CAbstractNavigator::TargetInfo::TargetInfo() :
    target_coords(0,0,0),
    target_frame_id("map"),
    targetAllowedDistance(0.5),
    targetIsRelative(false),
    targetDesiredRelSpeed(.05),
    targetIsIntermediaryWaypoint(false)
{
}
 
// Gets navigation params as a human-readable format:
std::string CAbstractNavigator::TargetInfo::getAsText() const
{
        string s;
        s += mrpt::format("target_coords = (%.03f,%.03f,%.03f deg)\n", target_coords.x, target_coords.y, target_coords.phi);
        s += mrpt::format("target_frame_id = \"%s\"\n", target_frame_id.c_str());
        s += mrpt::format("targetAllowedDistance = %.03f\n", targetAllowedDistance);
        s += mrpt::format("targetIsRelative = %s\n", targetIsRelative ? "YES" : "NO");
        s += mrpt::format("targetIsIntermediaryWaypoint = %s\n", targetIsIntermediaryWaypoint ? "YES" : "NO");
        s += mrpt::format("targetDesiredRelSpeed = %.02f\n", targetDesiredRelSpeed);
        return s;
}
 
bool mrpt::nav::CAbstractNavigator::TargetInfo::operator==(const TargetInfo & o) const
{
        return target_coords == o.target_coords &&
            target_frame_id == o.target_frame_id &&
            targetAllowedDistance == o.targetAllowedDistance &&
            targetIsRelative == o.targetIsRelative &&
            targetDesiredRelSpeed == o.targetDesiredRelSpeed &&
            targetIsIntermediaryWaypoint == o.targetIsIntermediaryWaypoint
            ;
}
 
// Gets navigation params as a human-readable format:
std::string CAbstractNavigator::TNavigationParams::getAsText() const
{
        string s;
        s+= "navparams. Single target:\n";
        s+= target.getAsText();
        return s;
}
 
bool CAbstractNavigator::TNavigationParams::isEqual(const CAbstractNavigator::TNavigationParamsBase& o) const
{
        auto * rhs = dynamic_cast<const CAbstractNavigator::TNavigationParams *>(&o);
        return (rhs != nullptr) && (this->target == rhs->target);
}
 
CAbstractNavigator::TRobotPoseVel::TRobotPoseVel() :
    pose(0,0,0),
    velGlobal(0,0,0),
    velLocal(0,0,0),
    rawOdometry(0,0,0),
    timestamp(INVALID_TIMESTAMP),
    pose_frame_id()
{
}
 
/*---------------------------------------------------------------
                                                        Constructor
  ---------------------------------------------------------------*/
CAbstractNavigator::CAbstractNavigator(CRobot2NavInterface &react_iterf_impl) :
    mrpt::utils::COutputLogger("MRPT_navigator"),
    m_lastNavigationState ( IDLE ),
    m_navigationEndEventSent(false),
    m_counter_check_target_is_blocked(0),
    m_rethrow_exceptions(false),
    m_navigationState     ( IDLE ),
    m_navigationParams    ( nullptr ),
    m_robot               ( react_iterf_impl ),
    m_frame_tf            (nullptr),
    m_curPoseVel          (),
    m_last_curPoseVelUpdate_robot_time(-1e9),
    m_latestPoses         (),
    m_latestOdomPoses     (),
    m_timlog_delays       (true, "CAbstractNavigator::m_timlog_delays")
{
        m_latestPoses.setInterpolationMethod(mrpt::poses::imLinear2Neig);
        m_latestOdomPoses.setInterpolationMethod(mrpt::poses::imLinear2Neig);
        this->setVerbosityLevel(mrpt::utils::LVL_DEBUG);
}
 
// Dtor:
CAbstractNavigator::~CAbstractNavigator()
{
        mrpt::utils::delete_safe( m_navigationParams );
}
 
/*---------------------------------------------------------------
                                                        cancel
  ---------------------------------------------------------------*/
void CAbstractNavigator::cancel()
{
        mrpt::synch::CCriticalSectionLocker csl(&m_nav_cs);
        MRPT_LOG_DEBUG("CAbstractNavigator::cancel() called.");
        m_navigationState = IDLE;
        this->stop(false /*not emergency*/);
}
 
 
/*---------------------------------------------------------------
                                                        resume
  ---------------------------------------------------------------*/
void CAbstractNavigator::resume()
{
        mrpt::synch::CCriticalSectionLocker csl(&m_nav_cs);
 
        MRPT_LOG_DEBUG("[CAbstractNavigator::resume() called.");
        if ( m_navigationState == SUSPENDED )
                m_navigationState = NAVIGATING;
}
 
 
/*---------------------------------------------------------------
                                                        suspend
  ---------------------------------------------------------------*/
void  CAbstractNavigator::suspend()
{
        mrpt::synch::CCriticalSectionLocker csl(&m_nav_cs);
 
        // Issue an "stop" if we are moving:
        // Update: do it *always*, even if the current velocity is zero, since
        // we may be in the middle of a multi-part motion command. It's safer.
        this->stop(false /*not an emergency stop*/);
 
        MRPT_LOG_DEBUG("CAbstractNavigator::suspend() called.");
        if ( m_navigationState == NAVIGATING )
                m_navigationState  = SUSPENDED;
}
 
void CAbstractNavigator::resetNavError()
{
        mrpt::synch::CCriticalSectionLocker csl(&m_nav_cs);
 
        MRPT_LOG_DEBUG("CAbstractNavigator::resetNavError() called.");
        if ( m_navigationState == NAV_ERROR )
        {
                m_navigationState  = IDLE;
                m_navErrorReason = TErrorReason();
        }
}
 
void CAbstractNavigator::setFrameTF(mrpt::poses::FrameTransformer<2>* frame_tf)
{
        m_frame_tf = frame_tf;
}
 
void CAbstractNavigator::loadConfigFile(const mrpt::utils::CConfigFileBase & c)
{
        MRPT_START
 
        params_abstract_navigator.loadFromConfigFile(c, "CAbstractNavigator");
 
        // At this point, all derived classes have already loaded their parameters.
        // Dump them to debug output:
        {
                mrpt::utils::CConfigFileMemory cfg_mem;
                this->saveConfigFile(cfg_mem);
                MRPT_LOG_INFO(cfg_mem.getContent());
        }
 
        MRPT_END
}
 
void CAbstractNavigator::saveConfigFile(mrpt::utils::CConfigFileBase & c) const
{
        params_abstract_navigator.saveToConfigFile(c, "CAbstractNavigator");
}
 
/*---------------------------------------------------------------
                                        navigationStep
  ---------------------------------------------------------------*/
void CAbstractNavigator::navigationStep()
{
        mrpt::synch::CCriticalSectionLocker csl(&m_nav_cs);
        mrpt::utils::CTimeLoggerEntry tle(m_timlog_delays, "CAbstractNavigator::navigationStep()");
 
        const TState prevState = m_navigationState;
        switch ( m_navigationState )
        {
        case IDLE:
        case SUSPENDED:
                try
            {
                    // If we just arrived at this state, stop robot:
                    if ( m_lastNavigationState == NAVIGATING )
                        {
                                MRPT_LOG_INFO("[CAbstractNavigator::navigationStep()] Navigation stopped.");
                                // this->stop();  stop() is called by the method switching the "state", so we have more flexibility
                                m_robot.stopWatchdog();
                        }
            } catch (...) { }
                break;
 
        case NAV_ERROR:
                try
            {
                    // Send end-of-navigation event:
                    if (m_lastNavigationState == NAVIGATING && m_navigationState == NAV_ERROR)
                        {
                                TPendingEvent ev;
                                ev.event_noargs = &CRobot2NavInterface::sendNavigationEndDueToErrorEvent;
                                m_pending_events.push_back(ev);
                        }
 
                        // If we just arrived at this state, stop the robot:
                        if ( m_lastNavigationState == NAVIGATING )
                        {
                                MRPT_LOG_ERROR("[CAbstractNavigator::navigationStep()] Stoping Navigation due to a NAV_ERROR state!");
                                this->stop(false /*not emergency*/);
                                m_robot.stopWatchdog();
                        }
            } catch (...) { }
                break;
 
        case NAVIGATING:
                this->performNavigationStepNavigating(true /* do call virtual method nav implementation*/);
                break;  // End case NAVIGATING
        };
        m_lastNavigationState = prevState;
 
        dispatchPendingNavEvents();
}
 
void CAbstractNavigator::dispatchPendingNavEvents()
{
        // Invoke pending events:
        for (auto &ev : m_pending_events)
        {
                if (ev.event_noargs != nullptr) {
                        (m_robot.*(ev.event_noargs))();
                }
                else if (ev.event_wp_reached) {
                        m_robot.sendWaypointReachedEvent(ev.event_wp_reached_index, ev.event_wp_reached_reached);
                }
                else if (ev.event_new_wp) {
                        m_robot.sendNewWaypointTargetEvent(ev.event_new_wp_index);
                }
                else if (ev.event_cannot_get_closer_target) {
                        bool do_abort_nav;
                        m_robot.sendCannotGetCloserToBlockedTargetEvent(do_abort_nav);
 
                        if (do_abort_nav)
                        {
                                MRPT_LOG_WARN("sendCannotGetCloserToBlockedTargetEvent() told me to abort navigation.");
                                m_navigationState = NAV_ERROR;
                                m_navErrorReason.error_code = ERR_CANNOT_REACH_TARGET;
                                m_navErrorReason.error_msg = "sendCannotGetCloserToBlockedTargetEvent() told me to abort navigation";
 
 
                                TPendingEvent ev;
                                ev.event_noargs = &CRobot2NavInterface::sendWaySeemsBlockedEvent;
                                m_pending_events.push_back(ev);
                        }
                }
        } // end for each pending event
        m_pending_events.clear();
}
 
void CAbstractNavigator::doEmergencyStop( const std::string &msg )
{
        try {
                this->stop(true /* emergency*/);
        }
        catch (...) { }
        m_navigationState = NAV_ERROR;
        // don't overwrite an error msg from a caller:
        if (m_navErrorReason.error_code==ERR_NONE)
        {
                m_navErrorReason.error_code = ERR_EMERGENCY_STOP;
                m_navErrorReason.error_msg = std::string("doEmergencyStop called for: ") + msg;
        }
        MRPT_LOG_ERROR(msg);
}
 
 
void CAbstractNavigator::onNavigateCommandReceived()
{
        mrpt::synch::CCriticalSectionLocker csl(&m_nav_cs);
 
        m_navigationEndEventSent = false;
        mrpt::utils::delete_safe(m_navigationParams);
}
 
void CAbstractNavigator::processNavigateCommand(const TNavigationParams *params)
{
        MRPT_START;
        mrpt::synch::CCriticalSectionLocker csl(&m_nav_cs);
 
        ASSERT_(params != nullptr);
        ASSERT_(params->target.targetDesiredRelSpeed >= .0 && params->target.targetDesiredRelSpeed <= 1.0);
 
        // Copy data:
        mrpt::utils::delete_safe(m_navigationParams);
        m_navigationParams = params->clone();
        ASSERT_(m_navigationParams != nullptr);
 
        // Transform: relative -> absolute, if needed.
        if (m_navigationParams->target.targetIsRelative)
        {
                this->updateCurrentPoseAndSpeeds();
                m_navigationParams->target.target_coords = m_curPoseVel.pose + m_navigationParams->target.target_coords;
                m_navigationParams->target.targetIsRelative = false; // Now it's not relative
        }
 
        // new state:
        m_navigationState = NAVIGATING;
        m_navErrorReason = TErrorReason();
 
        // Reset the bad navigation alarm:
        m_badNavAlarm_minDistTarget = std::numeric_limits<double>::max();
        m_badNavAlarm_lastMinDistTime = mrpt::system::getCurrentTime();
 
        MRPT_END;
}
 
void CAbstractNavigator::navigate(const CAbstractNavigator::TNavigationParams *params )
{
        MRPT_START;
        this->onNavigateCommandReceived();
        this->processNavigateCommand(params);
        MRPT_END;
}
 
void CAbstractNavigator::updateCurrentPoseAndSpeeds()
{
        // Ignore calls too-close in time, e.g. from the navigationStep() methods of
        // AbstractNavigator and a derived, overriding class.
        const double robot_time_secs = m_robot.getNavigationTime();  // this is clockwall time for real robots, simulated time in simulators.
 
        const double MIN_TIME_BETWEEN_POSE_UPDATES = 20e-3;
        if (m_last_curPoseVelUpdate_robot_time >=.0)
        {
                const double last_call_age = robot_time_secs - m_last_curPoseVelUpdate_robot_time;
                if (last_call_age < MIN_TIME_BETWEEN_POSE_UPDATES)
                {
                        MRPT_LOG_THROTTLE_DEBUG_FMT(5.0,"updateCurrentPoseAndSpeeds: ignoring call, since last call was only %f ms ago.", last_call_age*1e3);
                        return;  // previous data is still valid: don't query the robot again
                }
        }
 
        {
                mrpt::utils::CTimeLoggerEntry tle(m_timlog_delays, "getCurrentPoseAndSpeeds()");
                m_curPoseVel.pose_frame_id = std::string("map"); // default
                if (!m_robot.getCurrentPoseAndSpeeds(m_curPoseVel.pose, m_curPoseVel.velGlobal, m_curPoseVel.timestamp, m_curPoseVel.rawOdometry, m_curPoseVel.pose_frame_id))
                {
                        m_navigationState = NAV_ERROR;
                        m_navErrorReason.error_code = ERR_EMERGENCY_STOP;
                        m_navErrorReason.error_msg = std::string("ERROR calling m_robot.getCurrentPoseAndSpeeds, stopping robot and finishing navigation");
                        try {
                                this->stop(true /*emergency*/);
                        }
                        catch (...) {}
                        MRPT_LOG_ERROR("ERROR calling m_robot.getCurrentPoseAndSpeeds, stopping robot and finishing navigation");
                        throw std::runtime_error("ERROR calling m_robot.getCurrentPoseAndSpeeds, stopping robot and finishing navigation");
                }
        }
        m_curPoseVel.velLocal = m_curPoseVel.velGlobal;
        m_curPoseVel.velLocal.rotate(-m_curPoseVel.pose.phi);
 
        m_last_curPoseVelUpdate_robot_time = robot_time_secs;
        const bool changed_frame_id = (m_last_curPoseVelUpdate_pose_frame_id != m_curPoseVel.pose_frame_id);
        m_last_curPoseVelUpdate_pose_frame_id = m_curPoseVel.pose_frame_id;
 
        if (changed_frame_id)
        {
                // If frame changed, clear past poses. This could be improved by requesting
                // the transf between the two frames, but it's probably not worth.
                m_latestPoses.clear();
                m_latestOdomPoses.clear();
        }
 
        // Append to list of past poses:
        m_latestPoses.insert(m_curPoseVel.timestamp, m_curPoseVel.pose);
        m_latestOdomPoses.insert(m_curPoseVel.timestamp, m_curPoseVel.rawOdometry);
 
        // Purge old ones:
        while (m_latestPoses.size() > 1 &&
            mrpt::system::timeDifference(m_latestPoses.begin()->first, m_latestPoses.rbegin()->first) > PREVIOUS_POSES_MAX_AGE)
        {
                m_latestPoses.erase(m_latestPoses.begin());
        }
        while (m_latestOdomPoses.size() > 1 &&
            mrpt::system::timeDifference(m_latestOdomPoses.begin()->first, m_latestOdomPoses.rbegin()->first) > PREVIOUS_POSES_MAX_AGE)
        {
                m_latestOdomPoses.erase(m_latestOdomPoses.begin());
        }
}
 
bool CAbstractNavigator::changeSpeeds(const mrpt::kinematics::CVehicleVelCmd &vel_cmd)
{
        return m_robot.changeSpeeds(vel_cmd);
}
bool CAbstractNavigator::changeSpeedsNOP()
{
        return m_robot.changeSpeedsNOP();
}
bool CAbstractNavigator::stop(bool isEmergencyStop)
{
        return m_robot.stop(isEmergencyStop);
}
 
CAbstractNavigator::TAbstractNavigatorParams::TAbstractNavigatorParams() :
    dist_to_target_for_sending_event(0),
    alarm_seems_not_approaching_target_timeout(30),
    dist_check_target_is_blocked(0.6),
    hysteresis_check_target_is_blocked(3)
{
}
void CAbstractNavigator::TAbstractNavigatorParams::loadFromConfigFile(const mrpt::utils::CConfigFileBase &c, const std::string &s)
{
        MRPT_LOAD_CONFIG_VAR_CS(dist_to_target_for_sending_event, double);
        MRPT_LOAD_CONFIG_VAR_CS(alarm_seems_not_approaching_target_timeout, double);
        MRPT_LOAD_CONFIG_VAR_CS(dist_check_target_is_blocked, double);
        MRPT_LOAD_CONFIG_VAR_CS(hysteresis_check_target_is_blocked, int);
}
void CAbstractNavigator::TAbstractNavigatorParams::saveToConfigFile(mrpt::utils::CConfigFileBase &c, const std::string &s) const
{
        MRPT_SAVE_CONFIG_VAR_COMMENT(dist_to_target_for_sending_event, "Default value=0, means use the `targetAllowedDistance` passed by the user in the navigation request.");
        MRPT_SAVE_CONFIG_VAR_COMMENT(alarm_seems_not_approaching_target_timeout, "navigator timeout (seconds) [Default=30 sec]");
        MRPT_SAVE_CONFIG_VAR_COMMENT(dist_check_target_is_blocked, "When closer than this distance, check if the target is blocked to abort navigation with an error. [Default=0.6 m]");
        MRPT_SAVE_CONFIG_VAR_COMMENT(hysteresis_check_target_is_blocked, "How many steps should the condition for dist_check_target_is_blocked be fulfilled to raise an event");
}
 
bool mrpt::nav::operator==(const CAbstractNavigator::TNavigationParamsBase& a, const CAbstractNavigator::TNavigationParamsBase&b)
{
        return typeid(a) == typeid(b) && a.isEqual(b);
}
 
bool CAbstractNavigator::checkHasReachedTarget(const double targetDist) const
{
        return (targetDist < m_navigationParams->target.targetAllowedDistance);
}
 
void CAbstractNavigator::internal_onStartNewNavigation()
{
        m_robot.startWatchdog(1000);    // Watchdog = 1 seg
        m_latestPoses.clear(); // Clear cache of last poses.
        m_latestOdomPoses.clear();
        onStartNewNavigation();
}
 
void CAbstractNavigator::performNavigationStepNavigating(bool call_virtual_nav_method)
{
        const TState prevState = m_navigationState;
        try
        {
                if (m_lastNavigationState != NAVIGATING)
                {
                        MRPT_LOG_INFO("[CAbstractNavigator::navigationStep()] Starting Navigation. Watchdog initiated...\n");
                        if (m_navigationParams)
                                MRPT_LOG_DEBUG(mrpt::format("[CAbstractNavigator::navigationStep()] Navigation Params:\n%s\n", m_navigationParams->getAsText().c_str()));
 
                        internal_onStartNewNavigation();
                }
 
                // Have we just started the navigation?
                if (m_lastNavigationState == IDLE)
                {
                        TPendingEvent ev;
                        ev.event_noargs = &CRobot2NavInterface::sendNavigationStartEvent;
                        m_pending_events.push_back(ev);
                }
 
                /* ----------------------------------------------------------------
                Get current robot dyn state:
                ---------------------------------------------------------------- */
                updateCurrentPoseAndSpeeds();
 
                /* ----------------------------------------------------------------
                Have we reached the target location?
                ---------------------------------------------------------------- */
                // Build a 2D segment from the current robot pose to the previous one:
                ASSERT_(!m_latestPoses.empty());
                const mrpt::math::TSegment2D seg_robot_mov = mrpt::math::TSegment2D(
                    mrpt::math::TPoint2D(m_curPoseVel.pose),
                    m_latestPoses.size() > 1 ?
                    mrpt::math::TPoint2D((++m_latestPoses.rbegin())->second)
                    :
                    mrpt::math::TPoint2D((m_latestPoses.rbegin())->second)
                    );
 
                if (m_navigationParams)
                {
                        const double targetDist = seg_robot_mov.distance(mrpt::math::TPoint2D(m_navigationParams->target.target_coords));
 
                        // Should "End of navigation" event be sent??
                        if (!m_navigationParams->target.targetIsIntermediaryWaypoint && !m_navigationEndEventSent && targetDist < params_abstract_navigator.dist_to_target_for_sending_event)
                        {
                                m_navigationEndEventSent = true;
                                TPendingEvent ev;
                                ev.event_noargs = &CRobot2NavInterface::sendNavigationEndEvent;
                                m_pending_events.push_back(ev);
                                MRPT_LOG_DEBUG("[CAbstractNavigator::performNavigationStepNavigating] Enqueuing NavigationEndEvent (reason: targetDist<dist_to_target_for_sending_event).");
                        }
 
                        // Have we really reached the target?
                        if (checkHasReachedTarget(targetDist))
                        {
                                m_navigationState = IDLE;
                                logFmt(mrpt::utils::LVL_WARN, "Navigation target (%.03f,%.03f) was reached\n", m_navigationParams->target.target_coords.x, m_navigationParams->target.target_coords.y);
 
                                if (!m_navigationParams->target.targetIsIntermediaryWaypoint)
                                {
                                        this->stop(false /*not emergency*/);
                                        if (!m_navigationEndEventSent)
                                        {
                                                m_navigationEndEventSent = true;
                                                TPendingEvent ev;
                                                ev.event_noargs = &CRobot2NavInterface::sendNavigationEndEvent;
                                                m_pending_events.push_back(ev);
                                                MRPT_LOG_DEBUG("[CAbstractNavigator::performNavigationStepNavigating] Enqueuing NavigationEndEvent (reason: checkHasReachedTarget()=true).");
                                        }
                                }
                                return;
                        }
 
                        // Check the "no approaching the target"-alarm:
                        // -----------------------------------------------------------
                        if (targetDist < m_badNavAlarm_minDistTarget)
                        {
                                m_badNavAlarm_minDistTarget = targetDist;
                                m_badNavAlarm_lastMinDistTime = mrpt::system::getCurrentTime();
                        }
                        else
                        {
                                // Too much time have passed?
                                if (mrpt::system::timeDifference(m_badNavAlarm_lastMinDistTime, mrpt::system::getCurrentTime()) > params_abstract_navigator.alarm_seems_not_approaching_target_timeout)
                                {
                                        MRPT_LOG_WARN("Timeout approaching the target. Aborting navigation.");
 
                                        m_navigationState = NAV_ERROR;
                                        m_navErrorReason.error_code = ERR_CANNOT_REACH_TARGET;
                                        m_navErrorReason.error_msg = std::string("Timeout approaching the target. Aborting navigation.");
 
                                        TPendingEvent ev;
                                        ev.event_noargs = &CRobot2NavInterface::sendWaySeemsBlockedEvent;
                                        m_pending_events.push_back(ev);
                                        return;
                                }
                        }
 
                        // Check if the target seems to be at reach, but it's clearly occupied by obstacles:
                        if (targetDist < params_abstract_navigator.dist_check_target_is_blocked)
                        {
                                const auto rel_trg = m_navigationParams->target.target_coords - m_curPoseVel.pose;
                                const bool is_col = checkCollisionWithLatestObstacles(rel_trg);
                                if (is_col)
                                {
                                        const bool send_event = (++m_counter_check_target_is_blocked >= params_abstract_navigator.hysteresis_check_target_is_blocked);
 
                                        if (send_event)
                                        {
                                                MRPT_LOG_THROTTLE_WARN(5.0,"Target seems to be blocked by obstacles. Invoking sendCannotGetCloserToBlockedTargetEvent().");
 
                                                TPendingEvent ev;
                                                ev.event_cannot_get_closer_target = true;
                                                m_pending_events.push_back(ev);
 
                                                m_counter_check_target_is_blocked = 0;
                                        }
                                }
                                else
                                {
                                        m_counter_check_target_is_blocked = 0;
                                }
                        }
                }
 
                // The normal execution of the navigation: Execute one step:
                if (call_virtual_nav_method) {
                        performNavigationStep();
                }
        }
        catch (std::exception &e)
        {
                m_navigationState = NAV_ERROR;
                if (m_navErrorReason.error_code==ERR_NONE)
                {
                        m_navErrorReason.error_code = ERR_OTHER;
                        m_navErrorReason.error_msg = std::string("Exception: ") + std::string(e.what());
                }
 
                MRPT_LOG_ERROR_FMT("[CAbstractNavigator::navigationStep] Exception:\n %s",e.what());
                if (m_rethrow_exceptions) throw;
        }
        catch (...)
        {
                m_navigationState = NAV_ERROR;
                if (m_navErrorReason.error_code==ERR_NONE)
                {
                        m_navErrorReason.error_code = ERR_OTHER;
                        m_navErrorReason.error_msg = "Untyped exception";
                }
 
                MRPT_LOG_ERROR("[CAbstractNavigator::navigationStep] Untyped exception!");
                if (m_rethrow_exceptions) throw;
        }
        m_navigationState = prevState;
}
 
bool CAbstractNavigator::checkCollisionWithLatestObstacles(const mrpt::math::TPose2D &relative_robot_pose) const
{
        // Default impl:
        return false;
}
 
CAbstractNavigator::TPendingEvent::TPendingEvent() :
    event_noargs(nullptr),
    event_wp_reached(false),
    event_new_wp(false),
    event_cannot_get_closer_target(false)
{
}