VelocityController.cpp

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/*
 * This file is part of ArmarX.
 *
 * ArmarX is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * ArmarX 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, see <http://www.gnu.org/licenses/>.
 *
 * @package    ...
 * @author     Jianfeng Gao ( jianfeng dot gao at kit dot edu )
 * @date       2024
 * @copyright  http://www.gnu.org/licenses/gpl-2.0.txt
 *             GNU General Public License
 */
 
#include "VelocityController.h"
 
#include <VirtualRobot/MathTools.h>
#include <VirtualRobot/RobotNodeSet.h>
 
#include <ArmarXCore/core/ArmarXObjectScheduler.h>
#include <ArmarXCore/core/PackagePath.h> // for GUI
#include <ArmarXCore/core/time/CycleUtil.h>
#include <ArmarXCore/core/time/TimeUtil.h>
#include <ArmarXCore/observers/variant/SingleTypeVariantList.h> // for GUI
 
#include <RobotAPI/components/units/RobotUnit/ControlTargets/ControlTarget1DoFActuator.h>
#include <RobotAPI/components/units/RobotUnit/NJointControllers/NJointController.h>
#include <RobotAPI/components/units/RobotUnit/RobotUnit.h>
 
#include <armarx/control/common/aron_conversions.h> // for GUI
#include <armarx/control/common/utils.h>
#include <armarx/control/ethercat/RTUtility.h>
 
namespace armarx::control::njoint_controller::task_space
{
    NJointControllerRegistration<NJointTaskspaceVelocityController>
        registrationControllerNJointTaskspaceVelocityController(
            "NJointTaskspaceVelocityController");
 
    void
    NJointTaskspaceVelocityController::limbInit(const std::string nodeSetName,
                                                ArmPtr& arm,
                                                Config& cfg,
                                                VirtualRobot::RobotPtr& nonRtRobotPtr)
    {
        arm->kinematicChainName = nodeSetName;
        VirtualRobot::RobotNodeSetPtr rtRns =
            rtGetRobot()->getRobotNodeSet(arm->kinematicChainName);
        VirtualRobot::RobotNodeSetPtr nonRtRns =
            nonRtRobotPtr->getRobotNodeSet(arm->kinematicChainName);
        ARMARX_CHECK_EXPRESSION(rtRns) << arm->kinematicChainName;
        ARMARX_CHECK_EXPRESSION(nonRtRns) << arm->kinematicChainName;
        ARMARX_IMPORTANT << "Creating Taskspace Impedance controller with kinematic chain: "
                         << arm->kinematicChainName << " with num of joints: (RT robot) "
                         << rtRns->getSize() << ", and (non-RT robot) " << nonRtRns->getSize();
 
        arm->controller.initialize(nonRtRns, rtRns);
        arm->controller.ftsensor.initialize(rtRns, robotUnit, cfg.ftConfig);
        arm->jointNames.clear();
        for (size_t i = 0; i < rtRns->getSize(); ++i)
        {
            std::string jointName = rtRns->getNode(i)->getName();
            arm->jointNames.push_back(jointName);
 
            ControlTargetBase* ct = useControlTarget(jointName, ControlModes::Velocity1DoF);
            ARMARX_CHECK_EXPRESSION(ct);
            auto* casted_ct = ct->asA<ControlTarget1DoFActuatorVelocity>();
            ARMARX_CHECK_EXPRESSION(casted_ct);
            arm->targetsVel.push_back(casted_ct);
 
            const SensorValueBase* sv = useSensorValue(jointName);
            ARMARX_CHECK_EXPRESSION(sv);
            arm->sensorDevices.append(sv, jointName);
        };
 
        validateConfigData(cfg, arm);
        arm->rtConfig = cfg;
        arm->nonRtConfig = cfg;
        arm->rtStatus.reset(rtRns->getSize());
    }
 
    NJointTaskspaceVelocityController::NJointTaskspaceVelocityController(
        const RobotUnitPtr& robotUnit,
        const NJointControllerConfigPtr& config,
        const VirtualRobot::RobotPtr&) :
        robotUnit(robotUnit)
    {
        ARMARX_CHECK_EXPRESSION(robotUnit);
 
        ConfigPtrT cfg = ConfigPtrT::dynamicCast(config);
        ARMARX_CHECK_EXPRESSION(cfg);
        userConfig.fromAron(cfg->config);
 
        useSynchronizedRtRobot();
        nonRtRobot = robotUnit->cloneRobot();
        robotUnit->updateVirtualRobot(nonRtRobot);
 
        for (auto& pair : userConfig.limbs)
        {
            limb.emplace(pair.first, std::make_unique<ArmData>());
            limbInit(pair.first, limb.at(pair.first), pair.second, nonRtRobot);
            controllableNodeSets.emplace(pair.first, nonRtRobot->getRobotNodeSet(pair.first));
        }
 
        if (not userConfig.hands.empty())
        {
            hands = std::make_shared<core::HandControlBase>(nonRtRobot, userConfig.hands);
            for (auto& pair : userConfig.hands)
            {
                for (auto& jointName : hands->hands.at(pair.first)->jointNames)
                {
                    hands->appendDevice(pair.first,
                                        useSensorValue(jointName),
                                        useControlTarget(jointName, ControlModes::Position1DoF),
                                        jointName);
                }
                ARMARX_INFO << "construction of hand "
                            << hands->hands.at(pair.first)->kinematicChainName;
                controllableNodeSets.emplace(pair.first, nonRtRobot->getRobotNodeSet(pair.first));
            }
        }
    }
 
    std::string
    NJointTaskspaceVelocityController::getClassName(const Ice::Current&) const
    {
        return "NJointTaskspaceVelocityController";
    }
 
    void
    NJointTaskspaceVelocityController::onInitNJointController()
    {
        std::string taskName = getClassName() + "AdditionalTask";
        runTask(taskName,
                [&]
                {
                    armarx::control::ethercat::RTUtility::pinThreadToCPU(
                        4); // please don't set this to 0 as it is the rtRun/control thread
                    armarx::control::ethercat::RTUtility::elevateThreadPriority(
                        armarx::control::ethercat::RTUtility::RT_THREAD_PRIORITY);
 
                    CycleUtil c(1);
                    getObjectScheduler()->waitForObjectStateMinimum(eManagedIceObjectStarted);
                    ARMARX_IMPORTANT << "Create a new thread for " << getClassName();
                    while (getState() == eManagedIceObjectStarted)
                    {
                        if (isControllerActive())
                        {
                            additionalTask();
                        }
                        c.waitForCycleDuration();
                    }
                });
    }
 
    void
    NJointTaskspaceVelocityController::limbNonRT(ArmPtr& arm)
    {
        arm->bufferConfigNonRtToRt.getWriteBuffer() = arm->nonRtConfig;
        arm->bufferConfigNonRtToRt.commitWrite();
    }
 
    void
    NJointTaskspaceVelocityController::additionalTask()
    {
        bool rtSafe = additionalTaskUpdateStatus();
        additionalTaskSetTarget();
        if (not rtSafe)
        {
            handleRTNotSafeInNonRT();
        }
    }
 
    bool
    NJointTaskspaceVelocityController::additionalTaskUpdateStatus()
    {
        robotUnit->updateVirtualRobot(nonRtRobot);
        bool rtSafe = true;
        for (auto& pair : limb)
        {
            auto& arm = pair.second;
            arm->nonRtConfig = arm->bufferConfigUserToNonRt.getUpToDateReadBuffer();
            arm->rtStatusInNonRT = arm->bufferRtStatusToNonRt.getUpToDateReadBuffer();
            rtSafe = rtSafe and pair.second->rtStatusInNonRT.rtSafe;
        }
        if (hands)
        {
            hands->nonRTUpdateStatus();
        }
        return rtSafe;
    }
 
    void
    NJointTaskspaceVelocityController::additionalTaskSetTarget()
    {
        for (auto& pair : limb)
        {
            limbNonRT(pair.second);
        }
        if (hands)
        {
            hands->nonRTSetTarget();
        }
    }
 
    void
    NJointTaskspaceVelocityController::handleRTNotSafeInNonRT()
    {
        for (auto& pair : limb)
        {
            if (not pair.second->rtReady)
                continue;
 
            if (not pair.second->rtStatusInNonRT.rtTargetSafe)
            {
                pair.second->rtStatusInNonRT =
                    pair.second->bufferRtStatusToNonRt.getUpToDateReadBuffer();
                common::reportPoseDeviationWarning(pair.first,
                                                   pair.second->rtStatusInNonRT.currentPose,
                                                   pair.second->nonRtConfig.desiredPose,
                                                   "current pose",
                                                   "desired pose");
            }
        }
    }
 
    /// -------------------------------- Real time cotnrol -----------------------------------------
    void
    NJointTaskspaceVelocityController::limbRTUpdateStatus(ArmPtr& arm, const double deltaT)
    {
        arm->rtConfig = arm->bufferConfigNonRtToRt.getUpToDateReadBuffer();
        arm->rtStatus.deltaT = deltaT;
        arm->rtStatus.accumulateTime += deltaT;
 
        arm->controller.ftsensor.updateStatus(arm->rtConfig.ftConfig,
                                              arm->rtStatus.currentForceTorque,
                                              arm->rtStatus.deltaT,
                                              arm->rtFirstRun.load());
 
        arm->sensorDevices.updateJointValues(
            arm->rtStatus.jointPos, arm->rtStatus.jointVel, arm->rtStatus.jointTor);
 
 
        arm->bufferRtStatusToNonRt.getWriteBuffer() = arm->rtStatus;
        arm->bufferRtStatusToNonRt.commitWrite();
        arm->bufferRtStatusToUser.getWriteBuffer() = arm->rtStatus;
        arm->bufferRtStatusToUser.commitWrite();
    }
 
    void
    NJointTaskspaceVelocityController::limbRTSetTarget(ArmPtr& arm,
                                                       const Eigen::VectorXf& targetVelocity)
    {
        for (unsigned int i = 0; i < targetVelocity.size(); i++)
        {
            arm->targetsVel.at(i)->velocity = targetVelocity(i);
            if (!arm->targetsVel.at(i)->isValid())
            {
                arm->targetsVel.at(i)->velocity = 0;
            }
        }
        arm->bufferRtStatusToOnPublish.getWriteBuffer() = arm->rtStatus;
        arm->bufferRtStatusToOnPublish.commitWrite();
 
        arm->bufferConfigRtToOnPublish.getWriteBuffer() = arm->rtConfig;
        arm->bufferConfigRtToOnPublish.commitWrite();
 
        arm->bufferConfigRtToUser.getWriteBuffer() = arm->rtConfig;
        arm->bufferConfigRtToUser.commitWrite();
 
        if (arm->rtFirstRun.load())
        {
            arm->rtFirstRun.store(false);
            arm->rtReady.store(true);
        }
    }
 
    void
    NJointTaskspaceVelocityController::limbRT(ArmPtr& arm, const double deltaT)
    {
        double time_measure = IceUtil::Time::now().toMicroSecondsDouble();
        limbRTUpdateStatus(arm, deltaT);
        double time_update_status = IceUtil::Time::now().toMicroSecondsDouble() - time_measure;
 
        arm->controller.run(arm->rtConfig, arm->rtStatus);
        double time_run_rt = IceUtil::Time::now().toMicroSecondsDouble() - time_measure;
 
        limbRTSetTarget(arm, arm->rtStatus.desiredJointVelocity);
 
        double time_set_target = IceUtil::Time::now().toMicroSecondsDouble() - time_measure;
        time_measure = IceUtil::Time::now().toMicroSecondsDouble() - time_measure;
 
        if (time_measure > 200)
        {
            ARMARX_RT_LOGF_WARN("---- rt too slow: "
                                "time_update_status: %.2f\n"
                                "run_rt_limb: %.2f\n"
                                "set_target_limb: %.2f\n"
                                "time all: %.2f\n",
                                time_update_status, // 0-1 us
                                time_run_rt - time_update_status, //
                                time_set_target - time_run_rt, //
                                time_measure)
                .deactivateSpam(1.0f); // 0-1 us
        }
    }
 
    void
    NJointTaskspaceVelocityController::rtRun(const IceUtil::Time& /*sensorValuesTimestamp*/,
                                             const IceUtil::Time& timeSinceLastIteration)
    {
        double deltaT = timeSinceLastIteration.toSecondsDouble();
        for (auto& pair : limb)
        {
            limbRT(pair.second, deltaT);
        }
        if (hands)
        {
            hands->updateRTStatus(deltaT);
            hands->setTargets();
        }
    }
 
    /// ------------------------------ update/get config -------------------------------------------
    void
    NJointTaskspaceVelocityController::updateConfig(const ::armarx::aron::data::dto::DictPtr& dto,
                                                    const Ice::Current& iceCurrent)
    {
        auto prevCfg = userConfig;
        userConfig.fromAron(dto);
 
        for (auto& pair : userConfig.limbs)
        {
            validateConfigData(pair.second, limb.at(pair.first));
            if (common::detectAndReportPoseDeviationWarning(
                    pair.second.desiredPose,
                    prevCfg.limbs.at(pair.first).desiredPose,
                    "new desired pose",
                    "previous desired pose",
                    pair.second.safeDistanceMMToGoal,
                    pair.second.safeRotAngleDegreeToGoal,
                    "updateConfig_" + pair.first))
            {
                ARMARX_INFO << "use the existing target pose";
                pair.second.desiredPose = prevCfg.limbs.at(pair.first).desiredPose;
            }
            limb.at(pair.first)->bufferConfigUserToNonRt.getWriteBuffer() = pair.second;
            limb.at(pair.first)->bufferConfigUserToNonRt.commitWrite();
        }
        if (hands)
        {
            hands->updateConfig(userConfig.hands);
        }
    }
 
    ::armarx::aron::data::dto::DictPtr
    NJointTaskspaceVelocityController::getConfig(const Ice::Current& iceCurrent)
    {
        for (auto& pair : limb)
        {
            userConfig.limbs.at(pair.first) =
                pair.second->bufferConfigRtToUser.getUpToDateReadBuffer();
        }
        if (hands)
        {
            hands->getConfig(userConfig.hands);
        }
        return userConfig.toAronDTO();
    }
 
    void
    NJointTaskspaceVelocityController::enableSafeGuardForceTorque(const std::string& nodeSetName,
                                                                  const bool forceGuard,
                                                                  const bool torqueGuard,
                                                                  const Ice::Current& iceCurrent)
    {
        auto it = userConfig.limbs.find(nodeSetName);
        if (it != userConfig.limbs.end())
        {
            it->second.ftConfig.enableSafeGuardForce = forceGuard;
            it->second.ftConfig.enableSafeGuardTorque = torqueGuard;
            limb.at(nodeSetName)->controller.ftsensor.enableSafeGuard(forceGuard, torqueGuard);
            ARMARX_IMPORTANT
                << "reset safe guard with force torque sensors: safe? "
                << limb.at(nodeSetName)->controller.ftsensor.isSafe(it->second.ftConfig);
            limb.at(nodeSetName)->bufferConfigUserToNonRt.getWriteBuffer() = it->second;
            limb.at(nodeSetName)->bufferConfigUserToNonRt.commitWrite();
        }
        else
        {
            ARMARX_WARNING << "no robot node set with name " << nodeSetName
                           << " found in the controllers.";
        }
    }
 
    /// -------------------------------- Other interaces -------------------------------------------
    bool
    NJointTaskspaceVelocityController::isSafeForceTorque(const std::string& nodeSetName,
                                                         const Ice::Current& iceCurrent)
    {
        auto it = userConfig.limbs.find(nodeSetName);
        if (it != userConfig.limbs.end())
        {
            return limb.at(nodeSetName)->controller.ftsensor.ftSafe.load();
        }
        else
        {
            ARMARX_WARNING << "no robot node set with name " << nodeSetName
                           << " found in the controllers.";
        }
        return false;
    }
 
    Ice::FloatSeq
    NJointTaskspaceVelocityController::getTCPVel(const std::string& rns,
                                                 const Ice::Current& iceCurrent)
    {
        std::vector<float> tcpVel;
        auto& arm = limb.at(rns);
        auto s = arm->bufferRtStatusToUser.getUpToDateReadBuffer();
        for (int i = 0; i < s.currentTwist.size(); i++)
        {
            tcpVel.push_back(s.currentTwist[i]);
        }
        return tcpVel;
    }
 
    bool
    NJointTaskspaceVelocityController::updateTargetPose(
        const TargetPoseMap& targetPoseMap,
        const TargetNullspaceMap& targetNullspaceMap,
        const Ice::Current& iceCurrent)
    {
        for (auto& pair : userConfig.limbs)
        {
            for (size_t i = 0; i < 4; ++i)
            {
                for (int j = 0; j < 4; ++j)
                {
                    pair.second.desiredPose(i, j) = targetPoseMap.at(pair.first)[i][j];
                }
            }
            if (targetNullspaceMap.at(pair.first).size() > 0)
            {
                const size_t nDoF = pair.second.desiredNullspaceJointAngles.value().size();
                ARMARX_CHECK_EQUAL(targetNullspaceMap.at(pair.first).size(), nDoF)
                    << "the joint numbers does not match";
                for (size_t i = 0; i < nDoF; ++i)
                {
                    pair.second.desiredNullspaceJointAngles.value()(i) =
                        targetNullspaceMap.at(pair.first)[i];
                }
            }
            limb.at(pair.first)->bufferConfigUserToNonRt.getWriteBuffer() = pair.second;
            limb.at(pair.first)->bufferConfigUserToNonRt.commitWrite();
        }
        return true;
    }
 
    void
    NJointTaskspaceVelocityController::validateConfigData(Config& configData, ArmPtr& arm)
    {
        const auto nDoF = arm->controller.numOfJoints;
 
        const auto checkSize = [nDoF](const auto& v) { ARMARX_CHECK_EQUAL(v.rows(), nDoF); };
        const auto checkNonNegative = [](const auto& v) { ARMARX_CHECK((v.array() >= 0).all()); };
 
        if (!configData.desiredNullspaceJointAngles.has_value())
        {
            if (!isControllerActive())
            {
                ARMARX_INFO << "No user defined nullspace target, reset to zero with "
                            << VAROUT(nDoF);
                configData.desiredNullspaceJointAngles = Eigen::VectorXf::Zero(nDoF);
                arm->reInitPreActivate.store(true);
            }
            else
            {
                auto currentValue =
                    arm->bufferConfigRtToUser.getUpToDateReadBuffer().desiredNullspaceJointAngles;
                ARMARX_WARNING
                    << "Controller is active, but no user defined nullspace target. \n"
                       "You should first get up-to-date config of this controller and then update "
                       "it:\n"
                       "    auto cfg = ctrl->getConfig(); \n"
                       "    cfg.desiredPose = xxx;\n"
                       "    ctrl->updateConfig(cfg);\n"
                       "Now, I decide by myself to use the existing values of nullspace target\n"
                    << currentValue.value();
                configData.desiredNullspaceJointAngles = currentValue;
            }
        }
        ARMARX_CHECK_GREATER(configData.safeDistanceMMToGoal, 100.0f);
        checkSize(configData.desiredNullspaceJointAngles.value());
        checkSize(configData.kdNullspaceVel);
        checkSize(configData.kpNullspaceVel);
 
        checkNonNegative(configData.kdNullspaceVel);
        checkNonNegative(configData.kpNullspaceVel);
        checkNonNegative(configData.kpNullspaceVel);
        checkNonNegative(configData.kdNullspaceVel);
    }
 
    void
    NJointTaskspaceVelocityController::limbPublish(ArmPtr& arm,
                                                   const DebugObserverInterfacePrx& debugObs)
    {
        StringVariantBaseMap datafields;
        auto rtData = arm->bufferConfigRtToOnPublish.getUpToDateReadBuffer();
        auto rtStatus = arm->bufferRtStatusToOnPublish.getUpToDateReadBuffer();
 
 
        common::debugEigenPose(datafields, "current_pose", rtStatus.currentPose);
        common::debugEigenPose(datafields, "desired_pose", rtStatus.desiredPose);
        common::debugEigenVec(datafields, "desired_twist", rtData.desiredTwist);
        common::debugEigenVec(datafields, "kpCartVel", rtData.kpCartesianVel);
        common::debugEigenVec(datafields, "kdCartVel", rtData.kdCartesianVel);
 
        common::debugEigenVec(datafields, "currentForceTorque", rtStatus.currentForceTorque);
 
        common::debugEigenVec(datafields, "cartesianVelTarget", rtStatus.cartesianVelTarget);
        common::debugEigenVec(datafields, "nullspaceVel", rtStatus.nullspaceVelocity);
        common::debugEigenVec(
            datafields, "nullspaceTarget", rtData.desiredNullspaceJointAngles.value());
        common::debugEigenVec(datafields, "desiredJointVel", rtStatus.desiredJointVelocity);
        debugObs->setDebugChannel(getClassName() + "_" + arm->kinematicChainName, datafields);
    }
 
    void
    NJointTaskspaceVelocityController::onPublish(const SensorAndControl&,
                                                 const DebugDrawerInterfacePrx&,
                                                 const DebugObserverInterfacePrx& debugObs)
    {
        for (auto& pair : limb)
        {
            if (not pair.second->rtReady.load())
                continue;
            limbPublish(pair.second, debugObs);
        }
    }
 
    void
    NJointTaskspaceVelocityController::calibrateFTSensor(const Ice::Current&)
    {
        for (auto& pair : limb)
        {
            pair.second->rtReady.store(false);
        }
    }
 
    void
    NJointTaskspaceVelocityController::limbReInit(ArmPtr& arm)
    {
        VirtualRobot::RobotNodeSetPtr rns = rtGetRobot()->getRobotNodeSet(arm->kinematicChainName);
        Eigen::Matrix4f currentPose = rns->getTCP()->getPoseInRootFrame();
        auto quat = VirtualRobot::MathTools::eigen4f2quat(currentPose);
        ARMARX_RT_LOGF_INFO("rt preactivate controller with target pose\n\n "
                            "[ %.2f, %.2f, %.2f, %.2f, %.2f, %.2f, %.2f ].",
                            currentPose(0, 3),
                            currentPose(1, 3),
                            currentPose(2, 3),
                            quat.w,
                            quat.x,
                            quat.y,
                            quat.z);
 
        if (arm->reInitPreActivate.load())
        {
            arm->rtConfig.desiredNullspaceJointAngles.value() = rns->getJointValuesEigen();
            arm->rtConfig.desiredPose = currentPose;
 
            arm->bufferConfigUserToNonRt.reinitAllBuffers(arm->rtConfig);
            arm->reInitPreActivate.store(false);
        }
        {
            arm->nonRtConfig = arm->rtConfig;
            arm->bufferConfigNonRtToRt.reinitAllBuffers(arm->rtConfig);
            arm->bufferConfigRtToOnPublish.reinitAllBuffers(arm->rtConfig);
            arm->bufferConfigRtToUser.reinitAllBuffers(arm->rtConfig);
        }
        {
            arm->sensorDevices.updateJointValues(
                arm->rtStatus.jointPos, arm->rtStatus.jointVel, arm->rtStatus.jointTor);
            arm->rtStatus.rtPreActivate(currentPose);
 
            arm->rtStatusInNonRT = arm->rtStatus;
            arm->bufferRtStatusToOnPublish.reinitAllBuffers(arm->rtStatus);
            arm->bufferRtStatusToNonRt.reinitAllBuffers(arm->rtStatus);
            arm->bufferRtStatusToUser.reinitAllBuffers(arm->rtStatus);
        }
 
        arm->controller.preactivateInit(rns);
    }
 
    void
    NJointTaskspaceVelocityController::rtPreActivateController()
    {
        for (auto& pair : limb)
        {
            ARMARX_RT_LOGF_INFO("rtPreActivateController for %s", pair.first.c_str());
            limbReInit(pair.second);
            userConfig.limbs.at(pair.first) = pair.second->rtConfig;
        }
        if (hands)
        {
            hands->rtPreActivate();
        }
    }
 
    void
    NJointTaskspaceVelocityController::rtPostDeactivateController()
    {
        // for (auto& pair : limb)
        // {
        //     pair.second->controller.isInitialized.store(false);
        // }
    }
 
    /// ----------------------------------- GUI Widget ---------------------------------------------
    WidgetDescription::WidgetPtr
    NJointTaskspaceVelocityController::GenerateConfigDescription(
        const VirtualRobot::RobotPtr& robot,
        const std::map<std::string, ConstControlDevicePtr>& controlDevices,
        const std::map<std::string, ConstSensorDevicePtr>&)
    {
        using namespace armarx::WidgetDescription;
        HBoxLayoutPtr layout = new HBoxLayout;
 
 
        ::armarx::WidgetDescription::WidgetSeq widgets;
 
        /// select default config
        LabelPtr label = new Label;
        label->text = "select a controller config";
 
        StringComboBoxPtr cfgBox = new StringComboBox;
        cfgBox->name = "config_box";
        cfgBox->defaultIndex = 0;
        cfgBox->multiSelect = false;
 
        cfgBox->options = std::vector<std::string>{"default", "default_right", "default_right_a7"};
        ARMARX_TRACE;
 
        layout->children.emplace_back(label);
        layout->children.emplace_back(cfgBox);
        ARMARX_TRACE;
 
        layout->children.insert(layout->children.end(), widgets.begin(), widgets.end());
        ARMARX_INFO_S << "Layout done";
        return layout;
    }
 
    NJointTaskspaceVelocityController::ConfigPtrT
    NJointTaskspaceVelocityController::GenerateConfigFromVariants(
        const StringVariantBaseMap& values)
    {
        auto cfgName = values.at("config_box")->getString();
        const armarx::PackagePath configPath(
            "armarx_control",
            "controller_config/NJointTaskspaceVelocityController/" + cfgName + ".json");
        ARMARX_INFO_S << "Loading config from " << configPath.toSystemPath();
        ARMARX_CHECK(std::filesystem::exists(configPath.toSystemPath()));
 
        auto cfgDTO = armarx::readFromJson<ConfigDict>(configPath.toSystemPath());
 
        ARMARX_TRACE;
        return new ConfigurableNJointControllerConfig{cfgDTO.toAronDTO()};
    }
 
} // namespace armarx::control::njoint_controller::task_space