ParameterManager.cc

/****************************************************************************
 *
 *   (c) 2009-2016 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
 *
 * QGroundControl is licensed according to the terms in the file
 * COPYING.md in the root of the source code directory.
 *
 ****************************************************************************/

#include "ParameterManager.h"
#include "QGCApplication.h"
#include "QGCLoggingCategory.h"
#include "QGCApplication.h"
#include "UASMessageHandler.h"
#include "FirmwarePlugin.h"
#include "UAS.h"
#include "JsonHelper.h"

#include <QEasingCurve>
#include <QFile>
#include <QDebug>
#include <QVariantAnimation>
#include <QJsonArray>

QGC_LOGGING_CATEGORY(ParameterManagerVerbose1Log,           "ParameterManagerVerbose1Log")
QGC_LOGGING_CATEGORY(ParameterManagerVerbose2Log,           "ParameterManagerVerbose2Log")
QGC_LOGGING_CATEGORY(ParameterManagerDebugCacheFailureLog,  "ParameterManagerDebugCacheFailureLog") // Turn on to debug parameter cache crc misses

Fact ParameterManager::_defaultFact;

const char* ParameterManager::_cachedMetaDataFilePrefix =   "ParameterFactMetaData";
const char* ParameterManager::_jsonParametersKey =          "parameters";
const char* ParameterManager::_jsonCompIdKey =              "compId";
const char* ParameterManager::_jsonParamNameKey =           "name";
const char* ParameterManager::_jsonParamValueKey =          "value";

ParameterManager::ParameterManager(Vehicle* vehicle)
    : QObject                           (vehicle)
    , _vehicle                          (vehicle)
    , _mavlink                          (NULL)
    , _loadProgress                     (0.0)
    , _parametersReady                  (false)
    , _missingParameters                (false)
    , _initialLoadComplete              (false)
    , _waitingForDefaultComponent       (false)
    , _saveRequired                     (false)
    , _metaDataAddedToFacts             (false)
    , _logReplay                        (vehicle->priorityLink() && vehicle->priorityLink()->isLogReplay())
    , _parameterSetMajorVersion         (-1)
    , _parameterMetaData                (NULL)
    , _prevWaitingReadParamIndexCount   (0)
    , _prevWaitingReadParamNameCount    (0)
    , _prevWaitingWriteParamNameCount   (0)
    , _initialRequestRetryCount         (0)
    , _disableAllRetries                (false)
    , _indexBatchQueueActive            (false)
    , _totalParamCount                  (0)
{
    _versionParam = vehicle->firmwarePlugin()->getVersionParam();

    if (_vehicle->isOfflineEditingVehicle()) {
        _loadOfflineEditingParams();
        return;
    }

    _mavlink = qgcApp()->toolbox()->mavlinkProtocol();

    _initialRequestTimeoutTimer.setSingleShot(true);
    _initialRequestTimeoutTimer.setInterval(5000);
    connect(&_initialRequestTimeoutTimer, &QTimer::timeout, this, &ParameterManager::_initialRequestTimeout);

    _waitingParamTimeoutTimer.setSingleShot(true);
    _waitingParamTimeoutTimer.setInterval(3000);
    connect(&_waitingParamTimeoutTimer, &QTimer::timeout, this, &ParameterManager::_waitingParamTimeout);

    connect(_vehicle->uas(), &UASInterface::parameterUpdate, this, &ParameterManager::_parameterUpdate);

    // Ensure the cache directory exists
    QFileInfo(QSettings().fileName()).dir().mkdir("ParamCache");

    if (_vehicle->highLatencyLink()) {
        // High latency links don't load parameters
        _parametersReady = true;
        _missingParameters = true;
        _initialLoadComplete = true;
        _waitingForDefaultComponent = false;
        emit parametersReadyChanged(_parametersReady);
        emit missingParametersChanged(_missingParameters);
    } else if (!_logReplay){
        refreshAllParameters();
    }
}

ParameterManager::~ParameterManager()
{
    delete _parameterMetaData;
}

/// Called whenever a parameter is updated or first seen.
void ParameterManager::_parameterUpdate(int vehicleId, int componentId, QString parameterName, int parameterCount, int parameterId, int mavType, QVariant value)
{
    // Is this for our uas?
    if (vehicleId != _vehicle->id()) {
        return;
    }

    qCDebug(ParameterManagerVerbose1Log) << _logVehiclePrefix(componentId) <<
                                            "_parameterUpdate" <<
                                            "name:" << parameterName <<
                                            "count:" << parameterCount <<
                                            "index:" << parameterId <<
                                            "mavType:" << mavType <<
                                            "value:" << value <<
                                            ")";

    // ArduPilot has this strange behavior of streaming parameters that we didn't ask for. This even happens before it responds to the
    // PARAM_REQUEST_LIST. We disregard any of this until the initial request is responded to.
    if (parameterId == 65535 && parameterName != "_HASH_CHECK" && _initialRequestTimeoutTimer.isActive()) {
        qCDebug(ParameterManagerVerbose1Log) << "Disregarding unrequested param prior to initial list response" << parameterName;
        return;
    }

    _initialRequestTimeoutTimer.stop();

#if 0
    if (!_initialLoadComplete && !_indexBatchQueueActive) {
        // Handy for testing retry logic
        static int counter = 0;
        if (counter++ & 0x8) {
            qCDebug(ParameterManagerLog) << "Artificial discard" << counter;
            return;
        }
    }
#endif

#if 0
    // Use this to test missing default component id
    if (componentId == 50) {
        return;
    }
#endif

    if (_vehicle->px4Firmware() && parameterName == "_HASH_CHECK") {
        if (!_initialLoadComplete && !_logReplay) {
            /* we received a cache hash, potentially load from cache */
            _tryCacheHashLoad(vehicleId, componentId, value);
        }
        return;
    }

    // Used to debug cache crc misses (turn on ParameterManagerDebugCacheFailureLog)
    if (!_initialLoadComplete && !_logReplay && _debugCacheCRC.contains(componentId) && _debugCacheCRC[componentId]) {
        if (_debugCacheMap[componentId].contains(parameterName)) {
            const ParamTypeVal& cacheParamTypeVal = _debugCacheMap[componentId][parameterName];
            size_t dataSize = FactMetaData::typeToSize(static_cast<FactMetaData::ValueType_t>(cacheParamTypeVal.first));
            const void *cacheData = cacheParamTypeVal.second.constData();

            const void *vehicleData = value.constData();

            if (memcmp(cacheData, vehicleData, dataSize)) {
                qDebug() << "Cache/Vehicle values differ for name:cache:actual" << parameterName << value << cacheParamTypeVal.second;
            }
            _debugCacheParamSeen[componentId][parameterName] = true;
        } else {
            qDebug() << "Parameter missing from cache" << parameterName;
        }
    }

    _initialRequestTimeoutTimer.stop();
    _waitingParamTimeoutTimer.stop();

    _dataMutex.lock();

    // Update our total parameter counts
    if (!_paramCountMap.contains(componentId)) {
        _paramCountMap[componentId] = parameterCount;
        _totalParamCount += parameterCount;
    }

    // If we've never seen this component id before, setup the wait lists.
    if (!_waitingReadParamIndexMap.contains(componentId)) {
        // Add all indices to the wait list, parameter index is 0-based
        for (int waitingIndex=0; waitingIndex<parameterCount; waitingIndex++) {
            // This will add the new component id, as well as the the new waiting index and set the retry count for that index to 0
            _waitingReadParamIndexMap[componentId][waitingIndex] = 0;
        }

        // The read and write waiting lists for this component are initialized the empty
        _waitingReadParamNameMap[componentId] = QMap<QString, int>();
        _waitingWriteParamNameMap[componentId] = QMap<QString, int>();

        qCDebug(ParameterManagerLog) << _logVehiclePrefix(componentId) << "Seeing component for first time - paramcount:" << parameterCount;
    }

    bool componentParamsComplete = false;
    if (_waitingReadParamIndexMap[componentId].count() == 1) {
        // We need to know when we get the last param from a component in order to complete setup
        componentParamsComplete = true;
    }

    if (!_waitingReadParamIndexMap[componentId].contains(parameterId) &&
            !_waitingReadParamNameMap[componentId].contains(parameterName) &&
            !_waitingWriteParamNameMap[componentId].contains(parameterName)) {
        qCDebug(ParameterManagerVerbose1Log) << _logVehiclePrefix() << "Unrequested param update" << parameterName;
    }

    // Remove this parameter from the waiting lists
    if (_waitingReadParamIndexMap[componentId].contains(parameterId)) {
        _waitingReadParamIndexMap[componentId].remove(parameterId);
        _indexBatchQueue.removeOne(parameterId);
        _fillIndexBatchQueue(false /* waitingParamTimeout */);
    }
    _waitingReadParamNameMap[componentId].remove(parameterName);
    _waitingWriteParamNameMap[componentId].remove(parameterName);
    if (_waitingReadParamIndexMap[componentId].count()) {
        qCDebug(ParameterManagerVerbose2Log) << _logVehiclePrefix(componentId) << "_waitingReadParamIndexMap:" << _waitingReadParamIndexMap[componentId];
    }
    if (_waitingReadParamNameMap[componentId].count()) {
        qCDebug(ParameterManagerVerbose2Log) << _logVehiclePrefix(componentId) << "_waitingReadParamNameMap" << _waitingReadParamNameMap[componentId];
    }
    if (_waitingWriteParamNameMap[componentId].count()) {
        qCDebug(ParameterManagerVerbose2Log) << _logVehiclePrefix(componentId) << "_waitingWriteParamNameMap" << _waitingWriteParamNameMap[componentId];
    }

    // Track how many parameters we are still waiting for

    int waitingReadParamIndexCount = 0;
    int waitingReadParamNameCount = 0;
    int waitingWriteParamNameCount = 0;

    foreach(int waitingComponentId, _waitingReadParamIndexMap.keys()) {
        waitingReadParamIndexCount += _waitingReadParamIndexMap[waitingComponentId].count();
    }
    if (waitingReadParamIndexCount) {
        qCDebug(ParameterManagerVerbose1Log) << _logVehiclePrefix(componentId) << "waitingReadParamIndexCount:" << waitingReadParamIndexCount;
    }

    foreach(int waitingComponentId, _waitingReadParamNameMap.keys()) {
        waitingReadParamNameCount += _waitingReadParamNameMap[waitingComponentId].count();
    }
    if (waitingReadParamNameCount) {
        qCDebug(ParameterManagerVerbose1Log) << _logVehiclePrefix(componentId) << "waitingReadParamNameCount:" << waitingReadParamNameCount;
    }

    foreach(int waitingComponentId, _waitingWriteParamNameMap.keys()) {
        waitingWriteParamNameCount += _waitingWriteParamNameMap[waitingComponentId].count();
    }
    if (waitingWriteParamNameCount) {
        qCDebug(ParameterManagerVerbose1Log) << _logVehiclePrefix(componentId) << "waitingWriteParamNameCount:" << waitingWriteParamNameCount;
    }

    int readWaitingParamCount = waitingReadParamIndexCount + waitingReadParamNameCount;
    int totalWaitingParamCount = readWaitingParamCount + waitingWriteParamNameCount;
    if (totalWaitingParamCount) {
        // More params to wait for, restart timer
        _waitingParamTimeoutTimer.start();
        qCDebug(ParameterManagerVerbose1Log) << _logVehiclePrefix() << "Restarting _waitingParamTimeoutTimer: totalWaitingParamCount:" << totalWaitingParamCount;
    } else {
        if (!_mapParameterName2Variant.contains(_vehicle->defaultComponentId())) {
            // Still waiting for parameters from default component
            qCDebug(ParameterManagerLog) << _logVehiclePrefix() << "Restarting _waitingParamTimeoutTimer (still waiting for default component params)";
            _waitingParamTimeoutTimer.start();
        } else {
            qCDebug(ParameterManagerVerbose1Log) << _logVehiclePrefix() << "Not restarting _waitingParamTimeoutTimer (all requests satisfied)";
        }
    }

    // Update progress bar for waiting reads
    if (readWaitingParamCount == 0) {
        // We are no longer waiting for any reads to complete
        if (_prevWaitingReadParamIndexCount + _prevWaitingReadParamNameCount != 0) {
            // Set progress to 0 if not already there
            _setLoadProgress(0.0);
        }
    } else {
        _setLoadProgress((double)(_totalParamCount - readWaitingParamCount) / (double)_totalParamCount);
    }

    // Get parameter set version
    if (!_versionParam.isEmpty() && _versionParam == parameterName) {
        _parameterSetMajorVersion = value.toInt();
    }

    if (!_mapParameterName2Variant.contains(componentId) || !_mapParameterName2Variant[componentId].contains(parameterName)) {
        qCDebug(ParameterManagerVerbose1Log) << _logVehiclePrefix(componentId) << "Adding new fact" << parameterName;

        FactMetaData::ValueType_t factType;
        switch (mavType) {
        case MAV_PARAM_TYPE_UINT8:
            factType = FactMetaData::valueTypeUint8;
            break;
        case MAV_PARAM_TYPE_INT8:
            factType = FactMetaData::valueTypeInt8;
            break;
        case MAV_PARAM_TYPE_UINT16:
            factType = FactMetaData::valueTypeUint16;
            break;
        case MAV_PARAM_TYPE_INT16:
            factType = FactMetaData::valueTypeInt16;
            break;
        case MAV_PARAM_TYPE_UINT32:
            factType = FactMetaData::valueTypeUint32;
            break;
        case MAV_PARAM_TYPE_INT32:
            factType = FactMetaData::valueTypeInt32;
            break;
        case MAV_PARAM_TYPE_UINT64:
            factType = FactMetaData::valueTypeUint64;
            break;
        case MAV_PARAM_TYPE_INT64:
            factType = FactMetaData::valueTypeInt64;
            break;
        case MAV_PARAM_TYPE_REAL32:
            factType = FactMetaData::valueTypeFloat;
            break;
        case MAV_PARAM_TYPE_REAL64:
            factType = FactMetaData::valueTypeDouble;
            break;
        default:
            factType = FactMetaData::valueTypeInt32;
            qCritical() << "Unsupported fact type" << mavType;
            break;
        }

        Fact* fact = new Fact(componentId, parameterName, factType, this);

        _mapParameterName2Variant[componentId][parameterName] = QVariant::fromValue(fact);

        // We need to know when the fact changes from QML so that we can send the new value to the parameter manager
        connect(fact, &Fact::_containerRawValueChanged, this, &ParameterManager::_valueUpdated);
    }

    _dataMutex.unlock();

    Fact* fact = NULL;
    if (_mapParameterName2Variant[componentId].contains(parameterName)) {
        fact = _mapParameterName2Variant[componentId][parameterName].value<Fact*>();
    }
    if (fact) {
        fact->_containerSetRawValue(value);
    } else {
        qWarning() << "Internal error";
    }

    if (componentParamsComplete) {
        if (componentId == _vehicle->defaultComponentId()) {
            // Add meta data to default component. We need to do this before we setup the group map since group
            // map requires meta data.
            _addMetaDataToDefaultComponent();
        }

        // When we are getting the very last component param index, reset the group maps to update for the
        // new params. By handling this here, we can pick up components which finish up later than the default
        // component param set.
        _setupCategoryMap();
    }

    // Update param cache. The param cache is only used on PX4 Firmware since ArduPilot and Solo have volatile params
    // which invalidate the cache. The Solo also streams param updates in flight for things like gimbal values
    // which in turn causes a perf problem with all the param cache updates.
    if (!_logReplay && _vehicle->px4Firmware()) {
        if (_prevWaitingReadParamIndexCount + _prevWaitingReadParamNameCount != 0 && readWaitingParamCount == 0) {
            // All reads just finished, update the cache
            _writeLocalParamCache(vehicleId, componentId);
        }
    }

    _prevWaitingReadParamIndexCount = waitingReadParamIndexCount;
    _prevWaitingReadParamNameCount = waitingReadParamNameCount;
    _prevWaitingWriteParamNameCount = waitingWriteParamNameCount;

    _checkInitialLoadComplete();

    qCDebug(ParameterManagerVerbose1Log) << _logVehiclePrefix(componentId) << "_parameterUpdate complete";
}

/// Connected to Fact::valueUpdated
///
/// Writes the parameter to mavlink, sets up for write wait
void ParameterManager::_valueUpdated(const QVariant& value)
{
    Fact* fact = qobject_cast<Fact*>(sender());
    if (!fact) {
        qWarning() << "Internal error";
        return;
    }

    int componentId = fact->componentId();
    QString name = fact->name();

    _dataMutex.lock();

    if (_waitingWriteParamNameMap.contains(componentId)) {
        _waitingWriteParamNameMap[componentId].remove(name);    // Remove any old entry
        _waitingWriteParamNameMap[componentId][name] = 0;       // Add new entry and set retry count
        _waitingParamTimeoutTimer.start();
        _saveRequired = true;
    } else {
        qWarning() << "Internal error";
    }

    _dataMutex.unlock();

    _writeParameterRaw(componentId, fact->name(), value);
    qCDebug(ParameterManagerLog) << _logVehiclePrefix(componentId) << "Set parameter - name:" << name << value << "(_waitingParamTimeoutTimer started)";
}

void ParameterManager::refreshAllParameters(uint8_t componentId)
{
    if (_logReplay) {
        return;
    }

    _dataMutex.lock();

    if (!_initialLoadComplete) {
        _initialRequestTimeoutTimer.start();
    }

    // Reset index wait lists
    foreach (int cid, _paramCountMap.keys()) {
        // Add/Update all indices to the wait list, parameter index is 0-based
        if(componentId != MAV_COMP_ID_ALL && componentId != cid)
            continue;
        for (int waitingIndex = 0; waitingIndex < _paramCountMap[cid]; waitingIndex++) {
            // This will add a new waiting index if needed and set the retry count for that index to 0
            _waitingReadParamIndexMap[cid][waitingIndex] = 0;
        }
    }

    _dataMutex.unlock();

    MAVLinkProtocol* mavlink = qgcApp()->toolbox()->mavlinkProtocol();

    mavlink_message_t msg;
    mavlink_msg_param_request_list_pack_chan(mavlink->getSystemId(),
                                             mavlink->getComponentId(),
                                             _vehicle->priorityLink()->mavlinkChannel(),
                                             &msg,
                                             _vehicle->id(),
                                             componentId);
    _vehicle->sendMessageOnLink(_vehicle->priorityLink(), msg);

    QString what = (componentId == MAV_COMP_ID_ALL) ? "MAV_COMP_ID_ALL" : QString::number(componentId);
    qCDebug(ParameterManagerLog) << _logVehiclePrefix() << "Request to refresh all parameters for component ID:" << what;
}

/// Translates FactSystem::defaultComponentId to real component id if needed
int ParameterManager::_actualComponentId(int componentId)
{
    if (componentId == FactSystem::defaultComponentId) {
        componentId = _vehicle->defaultComponentId();
        if (componentId == FactSystem::defaultComponentId) {
            qWarning() << _logVehiclePrefix() << "Default component id not set";
        }
    }

    return componentId;
}

void ParameterManager::refreshParameter(int componentId, const QString& name)
{
    componentId = _actualComponentId(componentId);
    qCDebug(ParameterManagerLog) << _logVehiclePrefix(componentId) << "refreshParameter - name:" << name << ")";

    _dataMutex.lock();

    if (_waitingReadParamNameMap.contains(componentId)) {
        QString mappedParamName = _remapParamNameToVersion(name);

        _waitingReadParamNameMap[componentId].remove(mappedParamName);  // Remove old wait entry if there
        _waitingReadParamNameMap[componentId][mappedParamName] = 0;     // Add new wait entry and update retry count
        qCDebug(ParameterManagerLog) << _logVehiclePrefix(componentId) << "restarting _waitingParamTimeout";
        _waitingParamTimeoutTimer.start();
    } else {
        qWarning() << "Internal error";
    }

    _dataMutex.unlock();

    _readParameterRaw(componentId, name, -1);
}

void ParameterManager::refreshParametersPrefix(int componentId, const QString& namePrefix)
{
    componentId = _actualComponentId(componentId);
    qCDebug(ParameterManagerLog) << _logVehiclePrefix(componentId) << "refreshParametersPrefix - name:" << namePrefix << ")";

    foreach(const QString &name, _mapParameterName2Variant[componentId].keys()) {
        if (name.startsWith(namePrefix)) {
            refreshParameter(componentId, name);
        }
    }
}

bool ParameterManager::parameterExists(int componentId, const QString&  name)
{
    bool ret = false;

    componentId = _actualComponentId(componentId);
    if (_mapParameterName2Variant.contains(componentId)) {
        ret = _mapParameterName2Variant[componentId].contains(_remapParamNameToVersion(name));
    }

    return ret;
}

Fact* ParameterManager::getParameter(int componentId, const QString& name)
{
    componentId = _actualComponentId(componentId);

    QString mappedParamName = _remapParamNameToVersion(name);
    if (!_mapParameterName2Variant.contains(componentId) || !_mapParameterName2Variant[componentId].contains(mappedParamName)) {
        qgcApp()->reportMissingParameter(componentId, mappedParamName);
        return &_defaultFact;
    }

    return _mapParameterName2Variant[componentId][mappedParamName].value<Fact*>();
}

QStringList ParameterManager::parameterNames(int componentId)
{
    QStringList names;

    foreach(const QString &paramName, _mapParameterName2Variant[_actualComponentId(componentId)].keys()) {
        names << paramName;
    }

    return names;
}

void ParameterManager::_setupCategoryMap(void)
{
    // Must be able to handle being called multiple times
    _categoryMap.clear();

    foreach (const QString &name, _mapParameterName2Variant[_vehicle->defaultComponentId()].keys()) {
        Fact* fact = _mapParameterName2Variant[_vehicle->defaultComponentId()][name].value<Fact*>();
        _categoryMap[fact->category()][fact->group()] += name;
    }
}

const QMap<QString, QMap<QString, QStringList> >& ParameterManager::getCategoryMap(void)
{
    return _categoryMap;
}

/// Requests missing index based parameters from the vehicle.
///     @param waitingParamTimeout: true: being called due to timeout, false: being called to re-fill the batch queue
/// return true: Parameters were requested, false: No more requests needed
bool ParameterManager::_fillIndexBatchQueue(bool waitingParamTimeout)
{
    if (!_indexBatchQueueActive) {
        return false;
    }

    const int maxBatchSize = 10;

    if (waitingParamTimeout) {
        // We timed out, clear the queue and try again
        qCDebug(ParameterManagerLog) << "Refilling index based batch queue due to timeout";
        _indexBatchQueue.clear();
    } else {
        qCDebug(ParameterManagerLog) << "Refilling index based batch queue due to received parameter";
    }

    foreach(int componentId, _waitingReadParamIndexMap.keys()) {
        if (_waitingReadParamIndexMap[componentId].count()) {
            qCDebug(ParameterManagerLog) << _logVehiclePrefix() << "_waitingReadParamIndexMap count" << _waitingReadParamIndexMap[componentId].count();
            qCDebug(ParameterManagerVerbose1Log) << _logVehiclePrefix() << "_waitingReadParamIndexMap" << _waitingReadParamIndexMap[componentId];
        }

        foreach(int paramIndex, _waitingReadParamIndexMap[componentId].keys()) {
            if (_indexBatchQueue.contains(paramIndex)) {
                // Don't add more than once
                continue;
            }

            if (_indexBatchQueue.count() > maxBatchSize) {
                break;
            }

            _waitingReadParamIndexMap[componentId][paramIndex]++;   // Bump retry count
            if (_disableAllRetries || _waitingReadParamIndexMap[componentId][paramIndex] > _maxInitialLoadRetrySingleParam) {
                // Give up on this index
                _failedReadParamIndexMap[componentId] << paramIndex;
                qCDebug(ParameterManagerLog) << _logVehiclePrefix(componentId) << "Giving up on (paramIndex:" << paramIndex << "retryCount:" << _waitingReadParamIndexMap[componentId][paramIndex] << ")";
                _waitingReadParamIndexMap[componentId].remove(paramIndex);
            } else {
                // Retry again
                _indexBatchQueue.append(paramIndex);
                _readParameterRaw(componentId, "", paramIndex);
                qCDebug(ParameterManagerLog) << _logVehiclePrefix(componentId) << "Read re-request for (paramIndex:" << paramIndex << "retryCount:" << _waitingReadParamIndexMap[componentId][paramIndex] << ")";
            }
        }
    }

    return _indexBatchQueue.count() != 0;
}

void ParameterManager::_waitingParamTimeout(void)
{
    if (_logReplay) {
        return;
    }

    bool paramsRequested = false;
    const int maxBatchSize = 10;
    int batchCount = 0;

    qCDebug(ParameterManagerLog) << _logVehiclePrefix() << "_waitingParamTimeout";

    // Now that we have timed out for possibly the first time we can activate the index batch queue
    _indexBatchQueueActive = true;

    // First check for any missing parameters from the initial index based load
    paramsRequested = _fillIndexBatchQueue(true /* waitingParamTimeout */);

    if (!paramsRequested && !_waitingForDefaultComponent && !_mapParameterName2Variant.contains(_vehicle->defaultComponentId())) {
        // Initial load is complete but we still don't have any default component params. Wait one more cycle to see if the
        // any show up.
        qCDebug(ParameterManagerLog) << _logVehiclePrefix() << "Restarting _waitingParamTimeoutTimer - still don't have default component params" << _vehicle->defaultComponentId() << _mapParameterName2Variant.keys();
        _waitingParamTimeoutTimer.start();
        _waitingForDefaultComponent = true;
        return;
    }
    _waitingForDefaultComponent = false;

    _checkInitialLoadComplete();

    if (!paramsRequested) {
        foreach(int componentId, _waitingWriteParamNameMap.keys()) {
            foreach(const QString &paramName, _waitingWriteParamNameMap[componentId].keys()) {
                paramsRequested = true;
                _waitingWriteParamNameMap[componentId][paramName]++;   // Bump retry count
                if (_waitingWriteParamNameMap[componentId][paramName] <= _maxReadWriteRetry) {
                    _writeParameterRaw(componentId, paramName, getParameter(componentId, paramName)->rawValue());
                    qCDebug(ParameterManagerLog) << _logVehiclePrefix(componentId) << "Write resend for (paramName:" << paramName << "retryCount:" << _waitingWriteParamNameMap[componentId][paramName] << ")";
                    if (++batchCount > maxBatchSize) {
                        goto Out;
                    }
                } else {
                    // Exceeded max retry count, notify user
                    _waitingWriteParamNameMap[componentId].remove(paramName);
                    QString errorMsg = tr("Parameter write failed: veh:%1 comp:%2 param:%3").arg(_vehicle->id()).arg(componentId).arg(paramName);
                    qCDebug(ParameterManagerLog) << errorMsg;
                    qgcApp()->showMessage(errorMsg);
                }
            }
        }
    }

    if (!paramsRequested) {
        foreach(int componentId, _waitingReadParamNameMap.keys()) {
            foreach(const QString &paramName, _waitingReadParamNameMap[componentId].keys()) {
                paramsRequested = true;
                _waitingReadParamNameMap[componentId][paramName]++;   // Bump retry count
                if (_waitingReadParamNameMap[componentId][paramName] <= _maxReadWriteRetry) {
                    _readParameterRaw(componentId, paramName, -1);
                    qCDebug(ParameterManagerLog) << _logVehiclePrefix(componentId) << "Read re-request for (paramName:" << paramName << "retryCount:" << _waitingReadParamNameMap[componentId][paramName] << ")";
                    if (++batchCount > maxBatchSize) {
                        goto Out;
                    }
                } else {
                    // Exceeded max retry count, notify user
                    _waitingReadParamNameMap[componentId].remove(paramName);
                    QString errorMsg = tr("Parameter read failed: veh:%1 comp:%2 param:%3").arg(_vehicle->id()).arg(componentId).arg(paramName);
                    qCDebug(ParameterManagerLog) << errorMsg;
                    qgcApp()->showMessage(errorMsg);
                }
            }
        }
    }

Out:
    if (paramsRequested) {
        qCDebug(ParameterManagerLog) << _logVehiclePrefix() << "Restarting _waitingParamTimeoutTimer - re-request";
        _waitingParamTimeoutTimer.start();
    }
}

void ParameterManager::_readParameterRaw(int componentId, const QString& paramName, int paramIndex)
{
    mavlink_message_t msg;
    char fixedParamName[MAVLINK_MSG_PARAM_REQUEST_READ_FIELD_PARAM_ID_LEN];

    strncpy(fixedParamName, paramName.toStdString().c_str(), sizeof(fixedParamName));
    mavlink_msg_param_request_read_pack_chan(_mavlink->getSystemId(),   // QGC system id
                                             _mavlink->getComponentId(),     // QGC component id
                                             _vehicle->priorityLink()->mavlinkChannel(),
                                             &msg,                           // Pack into this mavlink_message_t
                                             _vehicle->id(),                 // Target system id
                                             componentId,                    // Target component id
                                             fixedParamName,                 // Named parameter being requested
                                             paramIndex);                    // Parameter index being requested, -1 for named
    _vehicle->sendMessageOnLink(_vehicle->priorityLink(), msg);
}

void ParameterManager::_writeParameterRaw(int componentId, const QString& paramName, const QVariant& value)
{
    mavlink_param_set_t     p;
    mavlink_param_union_t   union_value;

    memset(&p, 0, sizeof(p));

    FactMetaData::ValueType_t factType = getParameter(componentId, paramName)->type();
    p.param_type = _factTypeToMavType(factType);

    switch (factType) {
    case FactMetaData::valueTypeUint8:
        union_value.param_uint8 = (uint8_t)value.toUInt();
        break;

    case FactMetaData::valueTypeInt8:
        union_value.param_int8 = (int8_t)value.toInt();
        break;

    case FactMetaData::valueTypeUint16:
        union_value.param_uint16 = (uint16_t)value.toUInt();
        break;

    case FactMetaData::valueTypeInt16:
        union_value.param_int16 = (int16_t)value.toInt();
        break;

    case FactMetaData::valueTypeUint32:
        union_value.param_uint32 = (uint32_t)value.toUInt();
        break;

    case FactMetaData::valueTypeFloat:
        union_value.param_float = value.toFloat();
        break;

    default:
        qCritical() << "Unsupported fact type" << factType;
        // fall through

    case FactMetaData::valueTypeInt32:
        union_value.param_int32 = (int32_t)value.toInt();
        break;
    }

    p.param_value = union_value.param_float;
    p.target_system = (uint8_t)_vehicle->id();
    p.target_component = (uint8_t)componentId;

    strncpy(p.param_id, paramName.toStdString().c_str(), sizeof(p.param_id));

    mavlink_message_t msg;
    mavlink_msg_param_set_encode_chan(_mavlink->getSystemId(),
                                      _mavlink->getComponentId(),
                                      _vehicle->priorityLink()->mavlinkChannel(),
                                      &msg,
                                      &p);
    _vehicle->sendMessageOnLink(_vehicle->priorityLink(), msg);
}

void ParameterManager::_writeLocalParamCache(int vehicleId, int componentId)
{
    CacheMapName2ParamTypeVal cacheMap;

    foreach(const QString& name, _mapParameterName2Variant[componentId].keys()) {
        const Fact *fact = _mapParameterName2Variant[componentId][name].value<Fact*>();
        cacheMap[name] = ParamTypeVal(fact->type(), fact->rawValue());
    }

    QFile cacheFile(parameterCacheFile(vehicleId, componentId));
    cacheFile.open(QIODevice::WriteOnly | QIODevice::Truncate);

    QDataStream ds(&cacheFile);
    ds << cacheMap;
}

QDir ParameterManager::parameterCacheDir()
{
    const QString spath(QFileInfo(QSettings().fileName()).dir().absolutePath());
    return spath + QDir::separator() + "ParamCache";
}

QString ParameterManager::parameterCacheFile(int vehicleId, int componentId)
{
    return parameterCacheDir().filePath(QString("%1_%2.v2").arg(vehicleId).arg(componentId));
}

void ParameterManager::_tryCacheHashLoad(int vehicleId, int componentId, QVariant hash_value)
{
    qCInfo(ParameterManagerLog) << "Attemping load from cache";

    uint32_t crc32_value = 0;
    /* The datastructure of the cache table */
    CacheMapName2ParamTypeVal cacheMap;
    QFile cacheFile(parameterCacheFile(vehicleId, componentId));
    if (!cacheFile.exists()) {
        /* no local cache, just wait for them to come in*/
        return;
    }
    cacheFile.open(QIODevice::ReadOnly);

    /* Deserialize the parameter cache table */
    QDataStream ds(&cacheFile);
    ds >> cacheMap;

    // Load parameter meta data for the version number stored in cache.
    // We need meta data so we have access to the volatile bit
    if (cacheMap.contains(_versionParam)) {
        _parameterSetMajorVersion = cacheMap[_versionParam].second.toInt();
    }
    _loadMetaData();

    /* compute the crc of the local cache to check against the remote */

    FirmwarePlugin* firmwarePlugin = _vehicle->firmwarePlugin();
    foreach (const QString& name, cacheMap.keys()) {
        bool volatileValue = false;

        FactMetaData* metaData = firmwarePlugin->getMetaDataForFact(_parameterMetaData, name, _vehicle->vehicleType());
        if (metaData) {
            volatileValue = metaData->volatileValue();
        }

        if (volatileValue) {
            // Does not take part in CRC
            qCDebug(ParameterManagerLog) << "Volatile parameter" << name;
        } else {
            const ParamTypeVal& paramTypeVal = cacheMap[name];
            const void *vdat = paramTypeVal.second.constData();
            const FactMetaData::ValueType_t fact_type = static_cast<FactMetaData::ValueType_t>(paramTypeVal.first);
            crc32_value = QGC::crc32((const uint8_t *)qPrintable(name), name.length(),  crc32_value);
            crc32_value = QGC::crc32((const uint8_t *)vdat, FactMetaData::typeToSize(fact_type), crc32_value);
        }
    }

    /* if the two param set hashes match, just load from the disk */
    if (crc32_value == hash_value.toUInt()) {
        qCInfo(ParameterManagerLog) << "Parameters loaded from cache" << qPrintable(QFileInfo(cacheFile).absoluteFilePath());

        int count = cacheMap.count();
        int index = 0;
        foreach (const QString& name, cacheMap.keys()) {
            const ParamTypeVal& paramTypeVal = cacheMap[name];
            const FactMetaData::ValueType_t fact_type = static_cast<FactMetaData::ValueType_t>(paramTypeVal.first);
            const int mavType = _factTypeToMavType(fact_type);
            _parameterUpdate(vehicleId, componentId, name, count, index++, mavType, paramTypeVal.second);
        }

        // Return the hash value to notify we don't want any more updates
        mavlink_param_set_t     p;
        mavlink_param_union_t   union_value;
        memset(&p, 0, sizeof(p));
        p.param_type = MAV_PARAM_TYPE_UINT32;
        strncpy(p.param_id, "_HASH_CHECK", sizeof(p.param_id));
        union_value.param_uint32 = crc32_value;
        p.param_value = union_value.param_float;
        p.target_system = (uint8_t)_vehicle->id();
        p.target_component = (uint8_t)componentId;
        mavlink_message_t msg;
        mavlink_msg_param_set_encode_chan(_mavlink->getSystemId(),
                                          _mavlink->getComponentId(),
                                          _vehicle->priorityLink()->mavlinkChannel(),
                                          &msg,
                                          &p);
        _vehicle->sendMessageOnLink(_vehicle->priorityLink(), msg);

        // Give the user some feedback things loaded properly
        QVariantAnimation *ani = new QVariantAnimation(this);
        ani->setEasingCurve(QEasingCurve::OutCubic);
        ani->setStartValue(0.0);
        ani->setEndValue(1.0);
        ani->setDuration(750);

        connect(ani, &QVariantAnimation::valueChanged, [this](const QVariant &value) {
            _setLoadProgress(value.toDouble());
        });

        // Hide 500ms after animation finishes
        connect(ani, &QVariantAnimation::finished, [this](){
            QTimer::singleShot(500, [this]() {
                _setLoadProgress(0);
            });
        });

        ani->start(QAbstractAnimation::DeleteWhenStopped);
    } else {
        // Cache parameter version may differ from vehicle parameter version so we can't trust information loaded from cache parameter version number
        _parameterSetMajorVersion = -1;
        _clearMetaData();
        qCInfo(ParameterManagerLog) << "Parameters cache match failed" << qPrintable(QFileInfo(cacheFile).absoluteFilePath());
        if (ParameterManagerDebugCacheFailureLog().isDebugEnabled()) {
            _debugCacheCRC[componentId] = true;
            _debugCacheMap[componentId] = cacheMap;
            foreach (const QString& name, cacheMap.keys()) {
                _debugCacheParamSeen[componentId][name] = false;
            }
            qgcApp()->showMessage(tr("Parameter cache CRC match failed"));
        }
    }
}

QString ParameterManager::readParametersFromStream(QTextStream& stream)
{
    QString errors;

    while (!stream.atEnd()) {
        QString line = stream.readLine();
        if (!line.startsWith("#")) {
            QStringList wpParams = line.split("\t");
            int lineMavId = wpParams.at(0).toInt();
            if (wpParams.size() == 5) {
                if (_vehicle->id() != lineMavId) {
                    return QString("The parameters in the stream have been saved from System Id %1, but the current vehicle has the System Id %2.").arg(lineMavId).arg(_vehicle->id());
                }

                int     componentId = wpParams.at(1).toInt();
                QString paramName = wpParams.at(2);
                QString valStr = wpParams.at(3);
                uint    mavType = wpParams.at(4).toUInt();

                if (!parameterExists(componentId, paramName)) {
                    QString error;
                    error = QString("Skipped parameter %1:%2 - does not exist on this vehicle\n").arg(componentId).arg(paramName);
                    errors += error;
                    qCDebug(ParameterManagerLog) << error;
                    continue;
                }

                Fact* fact = getParameter(componentId, paramName);
                if (fact->type() != _mavTypeToFactType((MAV_PARAM_TYPE)mavType)) {
                    QString error;
                    error  = QString("Skipped parameter %1:%2 - type mismatch %3:%4\n").arg(componentId).arg(paramName).arg(fact->type()).arg(_mavTypeToFactType((MAV_PARAM_TYPE)mavType));
                    errors += error;
                    qCDebug(ParameterManagerLog) << error;
                    continue;
                }

                qCDebug(ParameterManagerLog) << "Updating parameter" << componentId << paramName << valStr;
                fact->setRawValue(valStr);
            }
        }
    }

    return errors;
}

void ParameterManager::writeParametersToStream(QTextStream &stream)
{
    stream << "# Onboard parameters for Vehicle " << _vehicle->id() << "\n";
    stream << "#\n";

    stream << "# Stack: " << _vehicle->firmwareTypeString() << "\n";
    stream << "# Vehicle: " << _vehicle->vehicleTypeString() << "\n";
    stream << "# Version: "
           << _vehicle->firmwareMajorVersion() << "."
           << _vehicle->firmwareMinorVersion() << "."
           << _vehicle->firmwarePatchVersion() << " "
           << _vehicle->firmwareVersionTypeString() << "\n";
    stream << "# Git Revision: " << _vehicle->gitHash() << "\n";

    stream << "#\n";
    stream << "# Vehicle-Id Component-Id Name Value Type\n";

    foreach (int componentId, _mapParameterName2Variant.keys()) {
        foreach (const QString &paramName, _mapParameterName2Variant[componentId].keys()) {
            Fact* fact = _mapParameterName2Variant[componentId][paramName].value<Fact*>();
            if (fact) {
                stream << _vehicle->id() << "\t" << componentId << "\t" << paramName << "\t" << fact->rawValueStringFullPrecision() << "\t" << QString("%1").arg(_factTypeToMavType(fact->type())) << "\n";
            } else {
                qWarning() << "Internal error: missing fact";
            }
        }
    }

    stream.flush();
}

MAV_PARAM_TYPE ParameterManager::_factTypeToMavType(FactMetaData::ValueType_t factType)
{
    switch (factType) {
    case FactMetaData::valueTypeUint8:
        return MAV_PARAM_TYPE_UINT8;

    case FactMetaData::valueTypeInt8:
        return MAV_PARAM_TYPE_INT8;

    case FactMetaData::valueTypeUint16:
        return MAV_PARAM_TYPE_UINT16;

    case FactMetaData::valueTypeInt16:
        return MAV_PARAM_TYPE_INT16;

    case FactMetaData::valueTypeUint32:
        return MAV_PARAM_TYPE_UINT32;

    case FactMetaData::valueTypeUint64:
        return MAV_PARAM_TYPE_UINT64;

    case FactMetaData::valueTypeInt64:
        return MAV_PARAM_TYPE_INT64;

    case FactMetaData::valueTypeFloat:
        return MAV_PARAM_TYPE_REAL32;