gnss/GnssAdapter.cpp

/* Copyright (c) 2017, The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials provided
 *       with the distribution.
 *     * Neither the name of The Linux Foundation, nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
#define LOG_TAG "LocSvc_GnssAdapter"

#include <sys/stat.h>
#include <errno.h>
#include <ctype.h>
#include <cutils/properties.h>
#include <math.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#include <GnssAdapter.h>
#include <string>
#include <loc_log.h>
#include <Agps.h>

using namespace loc_core;

GnssAdapter::GnssAdapter() :
    LocAdapterBase(0,
                   LocDualContext::getLocFgContext(NULL,
                                                   NULL,
                                                   LocDualContext::mLocationHalName,
                                                   false)),
    mUlpProxy(new UlpProxyBase()),
    mSuplMode(GNSS_SUPL_MODE_STANDALONE),
    mUlpPositionMode(),
    mGnssSvIdUsedInPosition(),
    mGnssSvIdUsedInPosAvail(false),
    mControlCallbacks(),
    mPowerVoteId(0),
    mNiData(),
    mAgpsManager()
{
    LOC_LOGD("%s]: Constructor %p", __func__, this);
    mUlpPositionMode.mode = LOC_POSITION_MODE_INVALID;
    readConfigCommand();
    setConfigCommand();

}

inline
GnssAdapter::~GnssAdapter()
{
    LOC_LOGD("%s]: Destructor", __func__);
    delete mUlpProxy;
}

void
GnssAdapter::setControlCallbacksCommand(LocationControlCallbacks& controlCallbacks)
{
    struct MsgSetControlCallbacks : public LocMsg {
        GnssAdapter& mAdapter;
        const LocationControlCallbacks mControlCallbacks;
        inline MsgSetControlCallbacks(GnssAdapter& adapter,
                                      LocationControlCallbacks& controlCallbacks) :
            LocMsg(),
            mAdapter(adapter),
            mControlCallbacks(controlCallbacks) {}
        inline virtual void proc() const {
            mAdapter.setControlCallbacks(mControlCallbacks);
        }
    };

    sendMsg(new MsgSetControlCallbacks(*this, controlCallbacks));
}

void
GnssAdapter::convertOptions(LocPosMode& out, const LocationOptions& options)
{
    LocPosMode locPosMode = {};
    switch (options.mode) {
    case GNSS_SUPL_MODE_MSB:
        out.mode = LOC_POSITION_MODE_MS_BASED;
        break;
    case GNSS_SUPL_MODE_MSA:
        out.mode = LOC_POSITION_MODE_MS_ASSISTED;
        break;
    default:
        out.mode = LOC_POSITION_MODE_STANDALONE;
        break;
    }
    out.share_position = true;
    out.min_interval = options.minInterval;
}

void
GnssAdapter::convertLocation(Location& out, const LocGpsLocation& locGpsLocation,
                             const LocPosTechMask techMask)
{
    out.size = sizeof(Location);
    if (LOC_GPS_LOCATION_HAS_LAT_LONG & locGpsLocation.flags) {
        out.flags |= LOCATION_HAS_LAT_LONG_BIT;
        out.latitude = locGpsLocation.latitude;
        out.longitude = locGpsLocation.longitude;
    }
    if (LOC_GPS_LOCATION_HAS_ALTITUDE & locGpsLocation.flags) {
        out.flags |= LOCATION_HAS_ALTITUDE_BIT;
        out.altitude = locGpsLocation.altitude;
    }
    if (LOC_GPS_LOCATION_HAS_SPEED & locGpsLocation.flags) {
        out.flags |= LOCATION_HAS_SPEED_BIT;
        out.speed = locGpsLocation.speed;
    }
    if (LOC_GPS_LOCATION_HAS_BEARING & locGpsLocation.flags) {
        out.flags |= LOCATION_HAS_BEARING_BIT;
        out.bearing = locGpsLocation.bearing;
    }
    if (LOC_GPS_LOCATION_HAS_ACCURACY & locGpsLocation.flags) {
        out.flags |= LOCATION_HAS_ACCURACY_BIT;
        out.accuracy = locGpsLocation.accuracy;
    }
    out.timestamp = locGpsLocation.timestamp;
    if (LOC_POS_TECH_MASK_SATELLITE & techMask) {
        out.techMask |= LOCATION_TECHNOLOGY_GNSS_BIT;
    }
    if (LOC_POS_TECH_MASK_CELLID & techMask) {
        out.techMask |= LOCATION_TECHNOLOGY_CELL_BIT;
    }
    if (LOC_POS_TECH_MASK_WIFI & techMask) {
        out.techMask |= LOCATION_TECHNOLOGY_WIFI_BIT;
    }
    if (LOC_POS_TECH_MASK_SENSORS & techMask) {
        out.techMask |= LOCATION_TECHNOLOGY_SENSORS_BIT;
    }
}

void
GnssAdapter::convertLocationInfo(GnssLocationInfoNotification& out,
                                 const GpsLocationExtended& locationExtended)
{
    out.size = sizeof(GnssLocationInfoNotification);
    if (GPS_LOCATION_EXTENDED_HAS_ALTITUDE_MEAN_SEA_LEVEL & locationExtended.flags) {
        out.flags |= GNSS_LOCATION_INFO_ALTITUDE_MEAN_SEA_LEVEL_BIT;
        out.altitudeMeanSeaLevel = locationExtended.altitudeMeanSeaLevel;
    }
    if (GPS_LOCATION_EXTENDED_HAS_DOP & locationExtended.flags) {
        out.flags |= GNSS_LOCATION_INFO_DOP_BIT;
        out.pdop = locationExtended.pdop;
        out.hdop = locationExtended.hdop;
        out.vdop = locationExtended.vdop;
    }
    if (GPS_LOCATION_EXTENDED_HAS_MAG_DEV & locationExtended.flags) {
        out.flags |= GNSS_LOCATION_INFO_MAGNETIC_DEVIATION_BIT;
        out.magneticDeviation = locationExtended.magneticDeviation;
    }
    if (GPS_LOCATION_EXTENDED_HAS_VERT_UNC & locationExtended.flags) {
        out.flags |= GNSS_LOCATION_INFO_VER_ACCURACY_BIT;
        out.verAccuracy = locationExtended.vert_unc;
    }
    if (GPS_LOCATION_EXTENDED_HAS_SPEED_UNC & locationExtended.flags) {
        out.flags |= GNSS_LOCATION_INFO_SPEED_ACCURACY_BIT;
        out.speedAccuracy = locationExtended.speed_unc;
    }
    if (GPS_LOCATION_EXTENDED_HAS_BEARING_UNC & locationExtended.flags) {
        out.flags |= GNSS_LOCATION_INFO_BEARING_ACCURACY_BIT;
        out.bearingAccuracy = locationExtended.bearing_unc;
    }
    if (GPS_LOCATION_EXTENDED_HAS_HOR_RELIABILITY & locationExtended.flags) {
        out.flags |= GNSS_LOCATION_INFO_HOR_RELIABILITY_BIT;
        switch (locationExtended.horizontal_reliability) {
            case LOC_RELIABILITY_VERY_LOW:
                out.horReliability = LOCATION_RELIABILITY_VERY_LOW;
                break;
            case LOC_RELIABILITY_LOW:
                out.horReliability = LOCATION_RELIABILITY_LOW;
                break;
            case LOC_RELIABILITY_MEDIUM:
                out.horReliability = LOCATION_RELIABILITY_MEDIUM;
                break;
            case LOC_RELIABILITY_HIGH:
                out.horReliability = LOCATION_RELIABILITY_HIGH;
                break;
            default:
                out.horReliability = LOCATION_RELIABILITY_NOT_SET;
                break;
        }
    }
    if (GPS_LOCATION_EXTENDED_HAS_VERT_RELIABILITY & locationExtended.flags) {
        out.flags |= GNSS_LOCATION_INFO_VER_RELIABILITY_BIT;
        switch (locationExtended.vertical_reliability) {
            case LOC_RELIABILITY_VERY_LOW:
                out.verReliability = LOCATION_RELIABILITY_VERY_LOW;
                break;
            case LOC_RELIABILITY_LOW:
                out.verReliability = LOCATION_RELIABILITY_LOW;
                break;
            case LOC_RELIABILITY_MEDIUM:
                out.verReliability = LOCATION_RELIABILITY_MEDIUM;
                break;
            case LOC_RELIABILITY_HIGH:
                out.verReliability = LOCATION_RELIABILITY_HIGH;
                break;
            default:
                out.verReliability = LOCATION_RELIABILITY_NOT_SET;
                break;
        }
    }
    if (GPS_LOCATION_EXTENDED_HAS_HOR_ELIP_UNC_MAJOR & locationExtended.flags) {
        out.flags |= GNSS_LOCATION_INFO_HOR_ACCURACY_ELIP_SEMI_MAJOR_BIT;
        out.horUncEllipseSemiMajor = locationExtended.horUncEllipseSemiMajor;
    }
    if (GPS_LOCATION_EXTENDED_HAS_HOR_ELIP_UNC_MINOR & locationExtended.flags) {
        out.flags |= GNSS_LOCATION_INFO_HOR_ACCURACY_ELIP_SEMI_MINOR_BIT;
        out.horUncEllipseSemiMinor = locationExtended.horUncEllipseSemiMinor;
    }
    if (GPS_LOCATION_EXTENDED_HAS_HOR_ELIP_UNC_AZIMUTH & locationExtended.flags) {
        out.flags |= GNSS_LOCATION_INFO_HOR_ACCURACY_ELIP_AZIMUTH_BIT;
        out.horUncEllipseOrientAzimuth = locationExtended.horUncEllipseOrientAzimuth;
    }
}

inline uint32_t
GnssAdapter::convertGpsLock(const GnssConfigGpsLock gpsLock)
{
    switch (gpsLock) {
        case GNSS_CONFIG_GPS_LOCK_MO:
            return 1;
        case GNSS_CONFIG_GPS_LOCK_NI:
            return 2;
        case GNSS_CONFIG_GPS_LOCK_MO_AND_NI:
            return 3;
        case GNSS_CONFIG_GPS_LOCK_NONE:
        default:
            return 0;
    }
}

inline GnssConfigGpsLock
GnssAdapter::convertGpsLock(const uint32_t gpsLock)
{
    switch (gpsLock) {
        case 1:
            return GNSS_CONFIG_GPS_LOCK_MO;
        case 2:
            return GNSS_CONFIG_GPS_LOCK_NI;
        case 3:
            return GNSS_CONFIG_GPS_LOCK_MO_AND_NI;
        case 0:
        default:
            return GNSS_CONFIG_GPS_LOCK_NONE;
    }
}

inline uint32_t
GnssAdapter::convertSuplVersion(const GnssConfigSuplVersion suplVersion)
{
    switch (suplVersion) {
        case GNSS_CONFIG_SUPL_VERSION_2_0_0:
            return 0x00020000;
        case GNSS_CONFIG_SUPL_VERSION_2_0_2:
            return 0x00020002;
        case GNSS_CONFIG_SUPL_VERSION_1_0_0:
        default:
            return 0x00010000;
    }
}

inline GnssConfigSuplVersion
GnssAdapter::convertSuplVersion(const uint32_t suplVersion)
{
    switch (suplVersion) {
        case 0x00020000:
            return GNSS_CONFIG_SUPL_VERSION_2_0_0;
        case 0x00020002:
            return GNSS_CONFIG_SUPL_VERSION_2_0_2;
        case 0x00010000:
        default:
            return GNSS_CONFIG_SUPL_VERSION_1_0_0;
    }
}

inline uint32_t
GnssAdapter::convertLppProfile(const GnssConfigLppProfile lppProfile)
{
    switch (lppProfile) {
        case GNSS_CONFIG_LPP_PROFILE_USER_PLANE:
            return 1;
        case GNSS_CONFIG_LPP_PROFILE_CONTROL_PLANE:
            return 2;
        case GNSS_CONFIG_LPP_PROFILE_USER_PLANE_AND_CONTROL_PLANE:
            return 3;
        case GNSS_CONFIG_LPP_PROFILE_RRLP_ON_LTE:
        default:
            return 0;
    }
}

inline GnssConfigLppProfile
GnssAdapter::convertLppProfile(const uint32_t lppProfile)
{
    switch (lppProfile) {
        case 1:
            return GNSS_CONFIG_LPP_PROFILE_USER_PLANE;
        case 2:
            return GNSS_CONFIG_LPP_PROFILE_CONTROL_PLANE;
        case 3:
            return GNSS_CONFIG_LPP_PROFILE_USER_PLANE_AND_CONTROL_PLANE;
        case 0:
        default:
            return GNSS_CONFIG_LPP_PROFILE_RRLP_ON_LTE;
    }
}

uint32_t
GnssAdapter::convertLppeCp(const GnssConfigLppeControlPlaneMask lppeControlPlaneMask)
{
    uint32_t mask = 0;
    if (GNSS_CONFIG_LPPE_CONTROL_PLANE_DBH_BIT & lppeControlPlaneMask) {
        mask |= (1<<0);
    }
    if (GNSS_CONFIG_LPPE_CONTROL_PLANE_WLAN_AP_MEASUREMENTS_BIT & lppeControlPlaneMask) {
        mask |= (1<<1);
    }
    return mask;
}

GnssConfigLppeControlPlaneMask
GnssAdapter::convertLppeCp(const uint32_t lppeControlPlaneMask)
{
    GnssConfigLppeControlPlaneMask mask = 0;
    if ((1<<0) & lppeControlPlaneMask) {
        mask |= GNSS_CONFIG_LPPE_CONTROL_PLANE_DBH_BIT;
    }
    if ((1<<1) & lppeControlPlaneMask) {
        mask |= GNSS_CONFIG_LPPE_CONTROL_PLANE_WLAN_AP_MEASUREMENTS_BIT;
    }
    return mask;
}


uint32_t
GnssAdapter::convertLppeUp(const GnssConfigLppeUserPlaneMask lppeUserPlaneMask)
{
    uint32_t mask = 0;
    if (GNSS_CONFIG_LPPE_USER_PLANE_DBH_BIT & lppeUserPlaneMask) {
        mask |= (1<<0);
    }
    if (GNSS_CONFIG_LPPE_USER_PLANE_WLAN_AP_MEASUREMENTS_BIT & lppeUserPlaneMask) {
        mask |= (1<<1);
    }
    return mask;
}

GnssConfigLppeUserPlaneMask
GnssAdapter::convertLppeUp(const uint32_t lppeUserPlaneMask)
{
    GnssConfigLppeUserPlaneMask mask = 0;
    if ((1<<0) & lppeUserPlaneMask) {
        mask |= GNSS_CONFIG_LPPE_USER_PLANE_DBH_BIT;
    }
    if ((1<<1) & lppeUserPlaneMask) {
        mask |= GNSS_CONFIG_LPPE_USER_PLANE_WLAN_AP_MEASUREMENTS_BIT;
    }
    return mask;
}

uint32_t
GnssAdapter::convertAGloProt(const GnssConfigAGlonassPositionProtocolMask aGloPositionProtocolMask)
{
    uint32_t mask = 0;
    if (GNSS_CONFIG_RRC_CONTROL_PLANE_BIT & aGloPositionProtocolMask) {
        mask |= (1<<0);
    }
    if (GNSS_CONFIG_RRLP_USER_PLANE_BIT & aGloPositionProtocolMask) {
        mask |= (1<<1);
    }
    if (GNSS_CONFIG_LLP_USER_PLANE_BIT & aGloPositionProtocolMask) {
        mask |= (1<<2);
    }
    if (GNSS_CONFIG_LLP_CONTROL_PLANE_BIT & aGloPositionProtocolMask) {
        mask |= (1<<3);
    }
    return mask;
}

uint32_t
GnssAdapter::convertEP4ES(const GnssConfigEmergencyPdnForEmergencySupl emergencyPdnForEmergencySupl)
{
    switch (emergencyPdnForEmergencySupl) {
       case GNSS_CONFIG_EMERGENCY_PDN_FOR_EMERGENCY_SUPL_YES:
           return 1;
       case GNSS_CONFIG_EMERGENCY_PDN_FOR_EMERGENCY_SUPL_NO:
       default:
           return 0;
    }
}

uint32_t
GnssAdapter::convertSuplEs(const GnssConfigSuplEmergencyServices suplEmergencyServices)
{
    switch (suplEmergencyServices) {
       case GNSS_CONFIG_SUPL_EMERGENCY_SERVICES_YES:
           return 1;
       case GNSS_CONFIG_SUPL_EMERGENCY_SERVICES_NO:
       default:
           return 0;
    }
}

uint32_t
GnssAdapter::convertSuplMode(const GnssConfigSuplModeMask suplModeMask)
{
    uint32_t mask = 0;
    if (GNSS_CONFIG_SUPL_MODE_MSB & suplModeMask) {
        mask |= (1<<0);
    }
    if (GNSS_CONFIG_SUPL_MODE_MSA & suplModeMask) {
        mask |= (1<<1);
    }
    return mask;
}

bool
GnssAdapter::resolveInAddress(const char* hostAddress, struct in_addr* inAddress)
{
    bool ret = true;

    struct hostent* hp;
    hp = gethostbyname(hostAddress);
    if (hp != NULL) { /* DNS OK */
        memcpy(inAddress, hp->h_addr_list[0], hp->h_length);
    } else {
        /* Try IP representation */
        if (inet_aton(hostAddress, inAddress) == 0) {
            /* IP not valid */
            LOC_LOGE("%s]: DNS query on '%s' failed", __func__, hostAddress);
            ret = false;
        }
    }

    return ret;
}

void
GnssAdapter::readConfigCommand()
{
    LOC_LOGD("%s]: ", __func__);

    struct MsgReadConfig : public LocMsg {
        GnssAdapter* mAdapter;
        ContextBase& mContext;
        inline MsgReadConfig(GnssAdapter* adapter,
                             ContextBase& context) :
            LocMsg(),
            mAdapter(adapter),
            mContext(context) {}
        inline virtual void proc() const {
            // reads config into mContext->mGps_conf
            mContext.readConfig();
            mContext.requestUlp((LocAdapterBase*)mAdapter, mContext.getCarrierCapabilities());
        }
    };

    if (mContext != NULL) {
        sendMsg(new MsgReadConfig(this, *mContext));
    }
}

void
GnssAdapter::setConfigCommand()
{
    LOC_LOGD("%s]: ", __func__);

    struct MsgSetConfig : public LocMsg {
        GnssAdapter& mAdapter;
        LocApiBase& mApi;
        inline MsgSetConfig(GnssAdapter& adapter,
                            LocApiBase& api) :
            LocMsg(),
            mAdapter(adapter),
            mApi(api) {}
        inline virtual void proc() const {
            if (ContextBase::mGps_conf.AGPS_CONFIG_INJECT) {
                mApi.setSUPLVersion(mAdapter.convertSuplVersion(ContextBase::mGps_conf.SUPL_VER));
                mApi.setLPPConfig(mAdapter.convertLppProfile(ContextBase::mGps_conf.LPP_PROFILE));
                mApi.setAGLONASSProtocol(ContextBase::mGps_conf.A_GLONASS_POS_PROTOCOL_SELECT);
            }
            mApi.setSensorControlConfig(ContextBase::mSap_conf.SENSOR_USAGE,
                                        ContextBase::mSap_conf.SENSOR_PROVIDER);
            mApi.setLPPeProtocolCp(
                mAdapter.convertLppeCp(ContextBase::mGps_conf.LPPE_CP_TECHNOLOGY));
            mApi.setLPPeProtocolUp(
                mAdapter.convertLppeUp(ContextBase::mGps_conf.LPPE_UP_TECHNOLOGY));
            if (NMEA_PROVIDER_MP == ContextBase::mGps_conf.NMEA_PROVIDER) {
                mApi.setNMEATypes(LOC_NMEA_ALL_SUPPORTED_MASK);
            }
            mApi.setXtraVersionCheck(ContextBase::mGps_conf.XTRA_VERSION_CHECK);
            if (ContextBase::mSap_conf.GYRO_BIAS_RANDOM_WALK_VALID ||
                ContextBase::mSap_conf.ACCEL_RANDOM_WALK_SPECTRAL_DENSITY_VALID ||
                ContextBase::mSap_conf.ANGLE_RANDOM_WALK_SPECTRAL_DENSITY_VALID ||
                ContextBase::mSap_conf.RATE_RANDOM_WALK_SPECTRAL_DENSITY_VALID ||
                ContextBase::mSap_conf.VELOCITY_RANDOM_WALK_SPECTRAL_DENSITY_VALID ) {
                mApi.setSensorProperties(
                    ContextBase::mSap_conf.GYRO_BIAS_RANDOM_WALK_VALID,
                    ContextBase::mSap_conf.GYRO_BIAS_RANDOM_WALK,
                    ContextBase::mSap_conf.ACCEL_RANDOM_WALK_SPECTRAL_DENSITY_VALID,
                    ContextBase::mSap_conf.ACCEL_RANDOM_WALK_SPECTRAL_DENSITY,
                    ContextBase::mSap_conf.ANGLE_RANDOM_WALK_SPECTRAL_DENSITY_VALID,
                    ContextBase::mSap_conf.ANGLE_RANDOM_WALK_SPECTRAL_DENSITY,
                    ContextBase::mSap_conf.RATE_RANDOM_WALK_SPECTRAL_DENSITY_VALID,
                    ContextBase::mSap_conf.RATE_RANDOM_WALK_SPECTRAL_DENSITY,
                    ContextBase::mSap_conf.VELOCITY_RANDOM_WALK_SPECTRAL_DENSITY_VALID,
                    ContextBase::mSap_conf.VELOCITY_RANDOM_WALK_SPECTRAL_DENSITY);
            }
            mApi.setSensorPerfControlConfig(
                ContextBase::mSap_conf.SENSOR_CONTROL_MODE,
                   ContextBase::mSap_conf.SENSOR_ACCEL_SAMPLES_PER_BATCH,
                   ContextBase::mSap_conf.SENSOR_ACCEL_BATCHES_PER_SEC,
                   ContextBase::mSap_conf.SENSOR_GYRO_SAMPLES_PER_BATCH,
                   ContextBase::mSap_conf.SENSOR_GYRO_BATCHES_PER_SEC,
                   ContextBase::mSap_conf.SENSOR_ACCEL_SAMPLES_PER_BATCH_HIGH,
                   ContextBase::mSap_conf.SENSOR_ACCEL_BATCHES_PER_SEC_HIGH,
                   ContextBase::mSap_conf.SENSOR_GYRO_SAMPLES_PER_BATCH_HIGH,
                   ContextBase::mSap_conf.SENSOR_GYRO_BATCHES_PER_SEC_HIGH,
                   ContextBase::mSap_conf.SENSOR_ALGORITHM_CONFIG_MASK);
        }
    };

    sendMsg(new MsgSetConfig(*this, *mLocApi));
}

uint32_t*
GnssAdapter::gnssUpdateConfigCommand(GnssConfig config)
{
    // count the number of bits set
    GnssConfigFlagsMask flagsCopy = config.flags;
    size_t count = 0;
    while (flagsCopy > 0) {
        if (flagsCopy & 1) {
            count++;
        }
        flagsCopy >>= 1;
    }
    std::string idsString = "[";
    uint32_t* ids = NULL;
    if (count > 0) {
        ids = new uint32_t[count];
        for (size_t i=0; i < count; ++i) {
            ids[i] = generateSessionId();
            IF_LOC_LOGD {
                idsString += std::to_string(ids[i]) + " ";
            }
        }
    }
    idsString += "]";

    LOC_LOGD("%s]: ids %s flags 0x%X", __func__, idsString.c_str(), config.flags);

    struct MsgGnssUpdateConfig : public LocMsg {
        GnssAdapter& mAdapter;
        LocApiBase& mApi;
        GnssConfig mConfig;
        uint32_t* mIds;
        size_t mCount;
        inline MsgGnssUpdateConfig(GnssAdapter& adapter,
                                   LocApiBase& api,
                                   GnssConfig config,
                                   uint32_t* ids,
                                   size_t count) :
            LocMsg(),
            mAdapter(adapter),
            mApi(api),
            mConfig(config),
            mIds(ids),
            mCount(count) {}
        inline virtual ~MsgGnssUpdateConfig()
        {
            delete[] mIds;
        }
        inline virtual void proc() const {
            //const size_t MAX_BITS_COUNT = 10;
            //LocationError errs[MAX_BITS_COUNT] = {};
            LocationError* errs = new LocationError[mCount];
            LocationError err = LOCATION_ERROR_SUCCESS;
            uint32_t index = 0;

            if (mConfig.flags & GNSS_CONFIG_FLAGS_GPS_LOCK_VALID_BIT) {
                uint32_t newGpsLock = mAdapter.convertGpsLock(mConfig.gpsLock);
                ContextBase::mGps_conf.GPS_LOCK = newGpsLock;
                if (0 == mAdapter.getPowerVoteId()) {
                    err = mApi.setGpsLock(mConfig.gpsLock);
                }
                if (index < mCount) {
                    errs[index++] = err;
                }
            }
            if (mConfig.flags & GNSS_CONFIG_FLAGS_SUPL_VERSION_VALID_BIT) {
                uint32_t newSuplVersion = mAdapter.convertSuplVersion(mConfig.suplVersion);
                if (newSuplVersion != ContextBase::mGps_conf.SUPL_VER &&
                    ContextBase::mGps_conf.AGPS_CONFIG_INJECT) {
                    ContextBase::mGps_conf.SUPL_VER = newSuplVersion;
                    err = mApi.setSUPLVersion(mConfig.suplVersion);
                } else {
                    err = LOCATION_ERROR_SUCCESS;
                }
                if (index < mCount) {
                    errs[index++] = err;
                }
            }
            if (mConfig.flags & GNSS_CONFIG_FLAGS_SET_ASSISTANCE_DATA_VALID_BIT) {
                if (GNSS_ASSISTANCE_TYPE_SUPL == mConfig.assistanceServer.type) {
                    if (ContextBase::mGps_conf.AGPS_CONFIG_INJECT) {
                        char serverUrl[MAX_URL_LEN] = {};
                        uint32_t length = 0;
                        const char noHost[] = "NONE";
                        if (NULL == mConfig.assistanceServer.hostName ||
                            strncasecmp(noHost,
                                        mConfig.assistanceServer.hostName,
                                        sizeof(noHost)) == 0) {
                        } else {
                            length = snprintf(serverUrl, sizeof(serverUrl), "%s:%u",
                                              mConfig.assistanceServer.hostName,
                                              mConfig.assistanceServer.port);
                        }

                        if (sizeof(serverUrl) > length) {
                            err = mApi.setServer(serverUrl, length);
                        } else {
                            err = LOCATION_ERROR_INVALID_PARAMETER;
                        }
                    } else {
                        err = LOCATION_ERROR_SUCCESS;
                    }
                } else if (GNSS_ASSISTANCE_TYPE_C2K == mConfig.assistanceServer.type) {
                    if (ContextBase::mGps_conf.AGPS_CONFIG_INJECT) {
                        struct in_addr addr;
                        if (!mAdapter.resolveInAddress(mConfig.assistanceServer.hostName, &addr)) {
                            LOC_LOGE("%s]: hostName %s cannot be resolved",
                                     __func__, mConfig.assistanceServer.hostName);
                            err = LOCATION_ERROR_INVALID_PARAMETER;
                        } else {
                            unsigned int ip = htonl(addr.s_addr);
                            err = mApi.setServer(ip, mConfig.assistanceServer.port,
                                                    LOC_AGPS_CDMA_PDE_SERVER);
                        }
                    } else {
                        err = LOCATION_ERROR_SUCCESS;
                    }
                } else {
                    LOC_LOGE("%s]: Not a valid gnss assistance type %u",
                             __func__, mConfig.assistanceServer.type);
                    err = LOCATION_ERROR_INVALID_PARAMETER;
                }
                if (index < mCount) {
                    errs[index++] = err;
                }
            }
            if (mConfig.flags & GNSS_CONFIG_FLAGS_LPP_PROFILE_VALID_BIT) {
                uint32_t newLppProfile = mAdapter.convertLppProfile(mConfig.lppProfile);
                if (newLppProfile != ContextBase::mGps_conf.LPP_PROFILE &&
                    ContextBase::mGps_conf.AGPS_CONFIG_INJECT) {
                    ContextBase::mGps_conf.LPP_PROFILE = newLppProfile;
                    err = mApi.setLPPConfig(mConfig.lppProfile);
                } else {
                    err = LOCATION_ERROR_SUCCESS;
                }
                if (index < mCount) {
                    errs[index++] = err;
                }
            }
            if (mConfig.flags & GNSS_CONFIG_FLAGS_LPPE_CONTROL_PLANE_VALID_BIT) {
                uint32_t newLppeControlPlaneMask =
                    mAdapter.convertLppeCp(mConfig.lppeControlPlaneMask);
                if (newLppeControlPlaneMask != ContextBase::mGps_conf.LPPE_CP_TECHNOLOGY) {
                    ContextBase::mGps_conf.LPPE_CP_TECHNOLOGY = newLppeControlPlaneMask;
                    err = mApi.setLPPeProtocolCp(mConfig.lppeControlPlaneMask);
                } else {
                    err = LOCATION_ERROR_SUCCESS;
                }
                if (index < mCount) {
                    errs[index++] = err;
                }
            }
            if (mConfig.flags & GNSS_CONFIG_FLAGS_LPPE_USER_PLANE_VALID_BIT) {
                uint32_t newLppeUserPlaneMask =
                    mAdapter.convertLppeUp(mConfig.lppeUserPlaneMask);
                if (newLppeUserPlaneMask != ContextBase::mGps_conf.LPPE_UP_TECHNOLOGY) {
                    ContextBase::mGps_conf.LPPE_UP_TECHNOLOGY = newLppeUserPlaneMask;
                    err = mApi.setLPPeProtocolUp(mConfig.lppeUserPlaneMask);
                } else {
                    err = LOCATION_ERROR_SUCCESS;
                }
                if (index < mCount) {
                    errs[index++] = err;
                }
            }
            if (mConfig.flags & GNSS_CONFIG_FLAGS_AGLONASS_POSITION_PROTOCOL_VALID_BIT) {
                uint32_t newAGloProtMask =
                    mAdapter.convertAGloProt(mConfig.aGlonassPositionProtocolMask);
                if (newAGloProtMask != ContextBase::mGps_conf.A_GLONASS_POS_PROTOCOL_SELECT &&
                    ContextBase::mGps_conf.AGPS_CONFIG_INJECT) {
                    ContextBase::mGps_conf.A_GLONASS_POS_PROTOCOL_SELECT = newAGloProtMask;
                    err = mApi.setAGLONASSProtocol(mConfig.aGlonassPositionProtocolMask);
                } else {
                    err = LOCATION_ERROR_SUCCESS;
                }
                if (index < mCount) {
                    errs[index++] = err;
                }
            }
            if (mConfig.flags & GNSS_CONFIG_FLAGS_EM_PDN_FOR_EM_SUPL_VALID_BIT) {
                uint32_t newEP4ES = mAdapter.convertEP4ES(mConfig.emergencyPdnForEmergencySupl);
                if (newEP4ES != ContextBase::mGps_conf.USE_EMERGENCY_PDN_FOR_EMERGENCY_SUPL) {
                    ContextBase::mGps_conf.USE_EMERGENCY_PDN_FOR_EMERGENCY_SUPL = newEP4ES;
                }
                err = LOCATION_ERROR_SUCCESS;
                if (index < mCount) {
                    errs[index++] = err;
                }
            }
            if (mConfig.flags & GNSS_CONFIG_FLAGS_SUPL_EM_SERVICES_BIT) {
                uint32_t newSuplEs = mAdapter.convertSuplEs(mConfig.suplEmergencyServices);
                if (newSuplEs != ContextBase::mGps_conf.SUPL_ES) {
                    ContextBase::mGps_conf.SUPL_ES = newSuplEs;
                }
                err = LOCATION_ERROR_SUCCESS;
                if (index < mCount) {
                    errs[index++] = err;
                }
            }
            if (mConfig.flags & GNSS_CONFIG_FLAGS_SUPL_MODE_BIT) {
                uint32_t newSuplMode = mAdapter.convertSuplMode(mConfig.suplModeMask);
                if (newSuplMode != ContextBase::mGps_conf.SUPL_MODE) {
                    ContextBase::mGps_conf.SUPL_MODE = newSuplMode;
                    mAdapter.getUlpProxy()->setCapabilities(
                        ContextBase::getCarrierCapabilities());
                }
                err = LOCATION_ERROR_SUCCESS;
                if (index < mCount) {
                    errs[index++] = err;
                }
            }

            mAdapter.reportResponse(index, errs, mIds);
            delete[] errs;
        }
    };

    if (NULL != ids) {
        sendMsg(new MsgGnssUpdateConfig(*this, *mLocApi, config, ids, count));
    } else {
        LOC_LOGE("%s]: No GNSS config items to update", __func__);
    }

    return ids;
}

uint32_t
GnssAdapter::gnssDeleteAidingDataCommand(GnssAidingData& data)
{
    uint32_t sessionId = generateSessionId();
    LOC_LOGD("%s]: client %p id %u", __func__, sessionId);

    struct MsgDeleteAidingData : public LocMsg {
        GnssAdapter& mAdapter;
        LocApiBase& mApi;
        uint32_t mSessionId;
        GnssAidingData mData;
        inline MsgDeleteAidingData(GnssAdapter& adapter,
                                   LocApiBase& api,
                                   uint32_t sessionId,
                                   GnssAidingData& data) :
            LocMsg(),
            mAdapter(adapter),
            mApi(api),
            mSessionId(sessionId),
            mData(data) {}
        inline virtual void proc() const {
            LocationError err = LOCATION_ERROR_SUCCESS;
            #ifdef TARGET_BUILD_VARIANT_USER
                err = LOCATION_ERROR_NOT_SUPPORTED;
            #endif
            if (LOCATION_ERROR_SUCCESS == err) {
                err = mApi.deleteAidingData(mData);
            }
            mAdapter.reportResponse(err, mSessionId);
        }
    };

    sendMsg(new MsgDeleteAidingData(*this, *mLocApi, sessionId, data));
    return sessionId;
}

void
GnssAdapter::injectLocationCommand(double latitude, double longitude, float accuracy)
{
    LOC_LOGD("%s]: latitude %8.4f longitude %8.4f accuracy %8.4f",
             __func__, latitude, longitude, accuracy);

    struct MsgInjectLocation : public LocMsg {
        LocApiBase& mApi;
        ContextBase& mContext;
        double mLatitude;
        double mLongitude;
        float mAccuracy;
        inline MsgInjectLocation(LocApiBase& api,
                                 ContextBase& context,
                                 double latitude,
                                 double longitude,
                                 float accuracy) :
            LocMsg(),
            mApi(api),
            mContext(context),
            mLatitude(latitude),
            mLongitude(longitude),
            mAccuracy(accuracy) {}
        inline virtual void proc() const {
            if (!mContext.hasCPIExtendedCapabilities()) {
                mApi.injectPosition(mLatitude, mLongitude, mAccuracy);
            }
        }
    };

    sendMsg(new MsgInjectLocation(*mLocApi, *mContext, latitude, longitude, accuracy));
}

void
GnssAdapter::injectTimeCommand(int64_t time, int64_t timeReference, int32_t uncertainty)
{
    LOC_LOGD("%s]: time %lld timeReference %lld uncertainty %d",
             __func__, time, timeReference, uncertainty);

    struct MsgInjectTime : public LocMsg {
        LocApiBase& mApi;
        ContextBase& mContext;
        int64_t mTime;
        int64_t mTimeReference;
        int32_t mUncertainty;
        inline MsgInjectTime(LocApiBase& api,
                             ContextBase& context,
                             int64_t time,
                             int64_t timeReference,
                             int32_t uncertainty) :
            LocMsg(),
            mApi(api),
            mContext(context),
            mTime(time),
            mTimeReference(timeReference),
            mUncertainty(uncertainty) {}
        inline virtual void proc() const {
            mApi.setTime(mTime, mTimeReference, mUncertainty);
        }
    };

    sendMsg(new MsgInjectTime(*mLocApi, *mContext, time, timeReference, uncertainty));
}

void
GnssAdapter::setUlpProxyCommand(UlpProxyBase* ulp)
{
    LOC_LOGD("%s]: ", __func__);

    struct MsgSetUlpProxy : public LocMsg {
        GnssAdapter& mAdapter;
        UlpProxyBase* mUlp;
        inline MsgSetUlpProxy(GnssAdapter& adapter,
                              UlpProxyBase* ulp) :
            LocMsg(),
            mAdapter(adapter),
            mUlp(ulp) {}
        inline virtual void proc() const {
            mAdapter.setUlpProxy(mUlp);
        }
    };

    sendMsg(new MsgSetUlpProxy(*this, ulp));
}

void
GnssAdapter::setUlpProxy(UlpProxyBase* ulp)
{
    if (ulp == mUlpProxy) {
        //This takes care of the case when double initalization happens
        //and we get the same object back for UlpProxyBase . Do nothing
        return;
    }

    LOC_LOGV("%s]: %p", __func__, ulp);
    if (NULL == ulp) {
        LOC_LOGE("%s]: ulp pointer is NULL", __func__);
        ulp = new UlpProxyBase();
    }

    if (LOC_POSITION_MODE_INVALID != mUlpProxy->mPosMode.mode) {
        // need to send this mode and start msg to ULP
        ulp->sendFixMode(mUlpProxy->mPosMode);
    }

    if (mUlpProxy->mFixSet) {
        ulp->sendStartFix();
    }

    delete mUlpProxy;
    mUlpProxy = ulp;
}

void
GnssAdapter::addClientCommand(LocationAPI* client, const LocationCallbacks& callbacks)
{
    LOC_LOGD("%s]: client %p", __func__, client);

    struct MsgAddClient : public LocMsg {
        GnssAdapter& mAdapter;
        LocationAPI* mClient;
        const LocationCallbacks mCallbacks;
        inline MsgAddClient(GnssAdapter& adapter,
                            LocationAPI* client,
                            const LocationCallbacks& callbacks) :
            LocMsg(),
            mAdapter(adapter),
            mClient(client),
            mCallbacks(callbacks) {}
        inline virtual void proc() const {
            mAdapter.saveClient(mClient, mCallbacks);
        }
    };

    sendMsg(new MsgAddClient(*this, client, callbacks));
}

void
GnssAdapter::removeClientCommand(LocationAPI* client)
{
    LOC_LOGD("%s]: client %p", __func__, client);

    struct MsgRemoveClient : public LocMsg {
        GnssAdapter& mAdapter;
        LocationAPI* mClient;
        inline MsgRemoveClient(GnssAdapter& adapter,
                               LocationAPI* client) :
            LocMsg(),
            mAdapter(adapter),
            mClient(client) {}
        inline virtual void proc() const {
            mAdapter.stopClientSessions(mClient);
            mAdapter.eraseClient(mClient);
        }
    };

    sendMsg(new MsgRemoveClient(*this, client));
}

void
GnssAdapter::stopClientSessions(LocationAPI* client)
{
    LOC_LOGD("%s]: client %p", __func__, client);
    for (auto it = mTrackingSessions.begin(); it != mTrackingSessions.end();) {
        if (client == it->first.client) {
            LocationError err = stopTrackingMultiplex(it->first.client, it->first.id);
            if (LOCATION_ERROR_SUCCESS == err) {
                it = mTrackingSessions.erase(it);
                continue;
            }
        }
        ++it; // increment only when not erasing an iterator
    }

}

void
GnssAdapter::updateClientsEventMask()
{
    LOC_API_ADAPTER_EVENT_MASK_T mask = 0;
    for (auto it=mClientData.begin(); it != mClientData.end(); ++it) {
        if (it->second.trackingCb != nullptr) {
            mask |= LOC_API_ADAPTER_BIT_PARSED_POSITION_REPORT;
        }
        if (it->second.gnssNiCb != nullptr) {
            mask |= LOC_API_ADAPTER_BIT_NI_NOTIFY_VERIFY_REQUEST;
        }
        if (it->second.gnssSvCb != nullptr) {
            mask |= LOC_API_ADAPTER_BIT_SATELLITE_REPORT;
        }
        if (it->second.gnssNmeaCb != nullptr &&
            NMEA_PROVIDER_MP == ContextBase::mGps_conf.NMEA_PROVIDER) {
            mask |= LOC_API_ADAPTER_BIT_NMEA_1HZ_REPORT;
        }
        if (it->second.gnssMeasurementsCb != nullptr) {
            mask |= LOC_API_ADAPTER_BIT_GNSS_MEASUREMENT;
        }
    }

    /*
    ** For Automotive use cases we need to enable MEASUREMENT and POLY
    ** when QDR is enabled
    */
    if(1 == ContextBase::mGps_conf.EXTERNAL_DR_ENABLED) {
        mask |= LOC_API_ADAPTER_BIT_GNSS_MEASUREMENT;
        mask |= LOC_API_ADAPTER_BIT_GNSS_SV_POLYNOMIAL_REPORT;

        LOC_LOGD("%s]: Auto usecase, Enable MEAS/POLY - mask 0x%x", __func__, mask);
    }

    updateEvtMask(mask, LOC_REGISTRATION_MASK_SET);
}

void
GnssAdapter::handleEngineUpEvent()
{
    struct MsgRestartSessions : public LocMsg {
        GnssAdapter& mAdapter;
        inline MsgRestartSessions(GnssAdapter& adapter) :
            LocMsg(),
            mAdapter(adapter) {}
        virtual void proc() const {
            mAdapter.restartSessions();
        }
    };

    setConfigCommand();
    sendMsg(new MsgRestartSessions(*this));
}

void
GnssAdapter::restartSessions()
{
    LOC_LOGD("%s]: ", __func__);

    if (mTrackingSessions.empty()) {
        return;
    }

    // get the LocationOptions that has the smallest interval, which should be the active one
    LocationOptions smallestIntervalOptions = {}; // size is zero until set for the first time
    for (auto it = mTrackingSessions.begin(); it != mTrackingSessions.end(); ++it) {
        if (0 == smallestIntervalOptions.size || //size of zero means we havent set it yet
            it->second.minInterval < smallestIntervalOptions.minInterval) {
             smallestIntervalOptions = it->second;
        }
    }

    startTracking(smallestIntervalOptions);
}

void
GnssAdapter::requestCapabilitiesCommand(LocationAPI* client)
{
    LOC_LOGD("%s]: ", __func__);

    struct MsgRequestCapabilities : public LocMsg {
        GnssAdapter& mAdapter;
        LocApiBase& mApi;
        LocationAPI* mClient;
        inline MsgRequestCapabilities(GnssAdapter& adapter,
                                      LocApiBase& api,
                                      LocationAPI* client) :
            LocMsg(),
            mAdapter(adapter),
            mApi(api),
            mClient(client) {}
        inline virtual void proc() const {
            LocationCallbacks callbacks = mAdapter.getClientCallbacks(mClient);
            if (callbacks.capabilitiesCb == nullptr) {
                LOC_LOGE("%s]: capabilitiesCb is NULL", __func__);
                return;
            }

            LocationCapabilitiesMask mask = {};
            // time based tracking always supported
            mask |= LOCATION_CAPABILITIES_TIME_BASED_TRACKING_BIT;
            if (mApi.isMessageSupported(LOC_API_ADAPTER_MESSAGE_DISTANCE_BASE_LOCATION_BATCHING)){
                mask |= LOCATION_CAPABILITIES_TIME_BASED_BATCHING_BIT |
                        LOCATION_CAPABILITIES_DISTANCE_BASED_BATCHING_BIT;
            }
            if (mApi.isMessageSupported(LOC_API_ADAPTER_MESSAGE_DISTANCE_BASE_TRACKING)) {
                mask |= LOCATION_CAPABILITIES_DISTANCE_BASED_TRACKING_BIT;
            }
            // geofence always supported
            mask |= LOCATION_CAPABILITIES_GEOFENCE_BIT;
            if (mApi.gnssConstellationConfig()) {
                mask |= LOCATION_CAPABILITIES_GNSS_MEASUREMENTS_BIT;
            }
            uint32_t carrierCapabilities = ContextBase::getCarrierCapabilities();
            if (carrierCapabilities & LOC_GPS_CAPABILITY_MSB) {
                mask |= LOCATION_CAPABILITIES_GNSS_MSB_BIT;
            }
            if (LOC_GPS_CAPABILITY_MSA & carrierCapabilities) {
                mask |= LOCATION_CAPABILITIES_GNSS_MSA_BIT;
            }

            callbacks.capabilitiesCb(mask);
        }
    };

    sendMsg(new MsgRequestCapabilities(*this, *mLocApi, client));
}

LocationCallbacks
GnssAdapter::getClientCallbacks(LocationAPI* client)
{
    LocationCallbacks callbacks = {};
    auto it = mClientData.find(client);
    if (it != mClientData.end()) {
        callbacks = it->second;
    }
    return callbacks;
}

void
GnssAdapter::saveClient(LocationAPI* client, const LocationCallbacks& callbacks)
{
    mClientData[client] = callbacks;
    updateClientsEventMask();
}

void
GnssAdapter::eraseClient(LocationAPI* client)
{
    auto it = mClientData.find(client);
    if (it != mClientData.end()) {
        mClientData.erase(it);
    }
    updateClientsEventMask();
}

bool
GnssAdapter::hasTrackingCallback(LocationAPI* client)
{
    auto it = mClientData.find(client);
    return (it != mClientData.end() && it->second.trackingCb);
}

bool
GnssAdapter::hasMeasurementsCallback(LocationAPI* client)
{
    auto it = mClientData.find(client);
    return (it != mClientData.end() && it->second.gnssMeasurementsCb);
}

bool
GnssAdapter::isTrackingSession(LocationAPI* client, uint32_t sessionId)
{
    LocationSessionKey key(client, sessionId);
    return (mTrackingSessions.find(key) != mTrackingSessions.end());
}

void
GnssAdapter::saveTrackingSession(LocationAPI* client, uint32_t sessionId,
                                 const LocationOptions& options)
{
    LocationSessionKey key(client, sessionId);
    mTrackingSessions[key] = options;
}

void
GnssAdapter::eraseTrackingSession(LocationAPI* client, uint32_t sessionId)
{
    LocationSessionKey key(client, sessionId);
    auto it = mTrackingSessions.find(key);
    if (it != mTrackingSessions.end()) {
        mTrackingSessions.erase(it);
    }

}

void
GnssAdapter::reportResponse(LocationAPI* client, LocationError err, uint32_t sessionId)
{
    LOC_LOGD("%s]: client %p id %u err %u", __func__, client, sessionId, err);

    auto it = mClientData.find(client);
    if (it != mClientData.end() &&
        it->second.responseCb != nullptr) {
        it->second.responseCb(err, sessionId);
    } else {
        LOC_LOGW("%s]: client %p id %u not found in data", __func__, client, sessionId);
    }
}

void
GnssAdapter::reportResponse(LocationError err, uint32_t sessionId)
{
    LOC_LOGD("%s]: id %u err %u", __func__, sessionId, err);

    if (mControlCallbacks.size > 0 && mControlCallbacks.responseCb != nullptr) {
        mControlCallbacks.responseCb(err, sessionId);
    } else {
        LOC_LOGW("%s]: control client response callback not found", __func__);
    }
}

void
GnssAdapter::reportResponse(size_t count, LocationError* errs, uint32_t* ids)
{
    IF_LOC_LOGD {
        std::string idsString = "[";
        std::string errsString = "[";
        if (NULL != ids && NULL != errs) {
            for (size_t i=0; i < count; ++i) {
                idsString += std::to_string(ids[i]) + " ";
                errsString += std::to_string(errs[i]) + " ";
            }
        }
        idsString += "]";
        errsString += "]";

        LOC_LOGD("%s]: ids %s errs %s",
                 __func__, idsString.c_str(), errsString.c_str());
    }

    if (mControlCallbacks.size > 0 && mControlCallbacks.collectiveResponseCb != nullptr) {
        mControlCallbacks.collectiveResponseCb(count, errs, ids);
    } else {
        LOC_LOGW("%s]: control client callback not found", __func__);
    }
}

uint32_t
GnssAdapter::startTrackingCommand(LocationAPI* client, LocationOptions& options)
{
    uint32_t sessionId = generateSessionId();
    LOC_LOGD("%s]: client %p id %u minInterval %u mode %u",
             __func__, client, sessionId, options.minInterval, options.mode);

    struct MsgStartTracking : public LocMsg {
        GnssAdapter& mAdapter;
        LocApiBase& mApi;
        LocationAPI* mClient;
        uint32_t mSessionId;
        LocationOptions mOptions;
        inline MsgStartTracking(GnssAdapter& adapter,
                               LocApiBase& api,
                               LocationAPI* client,
                               uint32_t sessionId,
                               LocationOptions options) :
            LocMsg(),
            mAdapter(adapter),
            mApi(api),
            mClient(client),
            mSessionId(sessionId),
            mOptions(options) {}
        inline virtual void proc() const {
            LocationError err = LOCATION_ERROR_SUCCESS;
            if (!mAdapter.hasTrackingCallback(mClient) &&
                !mAdapter.hasMeasurementsCallback(mClient)) {
                err = LOCATION_ERROR_CALLBACK_MISSING;
            } else if (0 == mOptions.size) {
                err = LOCATION_ERROR_INVALID_PARAMETER;
            } else {
                // Api doesn't support multiple clients for time based tracking, so mutiplex
                err = mAdapter.startTrackingMultiplex(mOptions);
                if (LOCATION_ERROR_SUCCESS == err) {
                    mAdapter.saveTrackingSession(mClient, mSessionId, mOptions);
                }
            }
            mAdapter.reportResponse(mClient, err, mSessionId);
        }
    };

    sendMsg(new MsgStartTracking(*this, *mLocApi, client, sessionId, options));
    return sessionId;

}

LocationError
GnssAdapter::startTrackingMultiplex(const LocationOptions& options)
{
    LocationError err = LOCATION_ERROR_SUCCESS;
    bool updateTrackingSession = false;

    if (mTrackingSessions.empty()) {
        err = startTracking(options);
    } else {
        // get the LocationOptions that has the smallest interval, which should be the active one
        LocationOptions smallestIntervalOptions = {}; // size is zero until set for the first time
        for (auto it = mTrackingSessions.begin(); it != mTrackingSessions.end(); ++it) {
            if (0 == smallestIntervalOptions.size || //size of zero means we havent set it yet
                it->second.minInterval < smallestIntervalOptions.minInterval) {
                 smallestIntervalOptions = it->second;
            }
        }
        // if new session's minInterval is smaller than any in other sessions
        if (options.minInterval < smallestIntervalOptions.minInterval) {
            // restart time based tracking with new options
            err = startTracking(options);
        }
    }

    return err;
}

LocationError
GnssAdapter::startTracking(const LocationOptions& options)
{
    LocationError err = LOCATION_ERROR_SUCCESS;
    LocPosMode locPosMode = {};
    convertOptions(locPosMode, options);
    if (!mUlpProxy->sendFixMode(locPosMode)) {
        // do nothing
    }
    if (!mUlpProxy->sendStartFix()) {
        loc_api_adapter_err apiErr = mLocApi->startFix(locPosMode);
        if (LOC_API_ADAPTER_ERR_SUCCESS == apiErr) {
            err = LOCATION_ERROR_SUCCESS;
            // save supl mode, which is used for NMEA generation
            setSuplMode(options.mode);
        } else {
            err = LOCATION_ERROR_GENERAL_FAILURE;
        }
    }

    return err;
}

void
GnssAdapter::setPositionModeCommand(LocPosMode& locPosMode)
{
    LOC_LOGD("%s]: min_interval %u mode %u",
             __func__, locPosMode.min_interval, locPosMode.mode);

    struct MsgSetPositionMode : public LocMsg {
        GnssAdapter& mAdapter;
        LocApiBase& mApi;
        LocPosMode mLocPosMode;
        inline MsgSetPositionMode(GnssAdapter& adapter,
                                  LocApiBase& api,
                                  LocPosMode& locPosMode) :
            LocMsg(),
            mAdapter(adapter),
            mApi(api),
            mLocPosMode(locPosMode) {}
        inline virtual void proc() const {
             // saves the mode in adapter to be used when startTrackingCommand is called from ULP
            mAdapter.setUlpPositionMode(mLocPosMode);
            mApi.setPositionMode(mLocPosMode);
        }
    };

    sendMsg(new MsgSetPositionMode(*this, *mLocApi, locPosMode));
}

void
GnssAdapter::startTrackingCommand()
{
    LOC_LOGD("%s]: ", __func__);

    struct MsgStartTracking : public LocMsg {
        GnssAdapter& mAdapter;
        LocApiBase& mApi;
        inline MsgStartTracking(GnssAdapter& adapter,
                                LocApiBase& api) :
            LocMsg(),
            mAdapter(adapter),
            mApi(api) {}
        inline virtual void proc() const {
            // we get this call from ULP, so just call LocApi without multiplexing because
            // ulp would be doing the multiplexing for us if it is present
            LocPosMode& ulpPositionMode = mAdapter.getUlpPositionMode();
            mApi.startFix(ulpPositionMode);
            // save supl mode, which is used for NMEA generation
            mAdapter.setSuplMode((GnssSuplMode)ulpPositionMode.mode);
        }
    };

    sendMsg(new MsgStartTracking(*this, *mLocApi));
}

void
GnssAdapter::updateTrackingOptionsCommand(LocationAPI* client, uint32_t id,
                                          LocationOptions& options)
{
    LOC_LOGD("%s]: client %p id %u minInterval %u mode %u",
             __func__, client, id, options.minInterval, options.mode);

    struct MsgUpdateTracking : public LocMsg {
        GnssAdapter& mAdapter;
        LocApiBase& mApi;
        LocationAPI* mClient;
        uint32_t mSessionId;
        LocationOptions mOptions;
        inline MsgUpdateTracking(GnssAdapter& adapter,
                                LocApiBase& api,
                                LocationAPI* client,
                                uint32_t sessionId,
                                LocationOptions options) :
            LocMsg(),
            mAdapter(adapter),
            mApi(api),
            mClient(client),
            mSessionId(sessionId),
            mOptions(options) {}
        inline virtual void proc() const {
            if (mAdapter.isTrackingSession(mClient, mSessionId)) {
                LocationError err = LOCATION_ERROR_SUCCESS;
                if (0 == mOptions.size) {
                    err = LOCATION_ERROR_INVALID_PARAMETER;
                } else {
                    // Api doesn't support multiple clients for time based tracking, so mutiplex
                    err = mAdapter.startTrackingMultiplex(mOptions);
                    if (LOCATION_ERROR_SUCCESS == err) {
                        mAdapter.saveTrackingSession(mClient, mSessionId, mOptions);
                    }
                }
                mAdapter.reportResponse(mClient, err, mSessionId);
            }
            // we do not reportResponse for the case where there is no existing tracking session
            // for the client and id being used, since updateTrackingCommand can be sent to both
            // GnssAdapter & FlpAdapter by LocationAPI and we want to avoid incorrect error response
        }
    };

    sendMsg(new MsgUpdateTracking(*this, *mLocApi, client, id, options));
}

void
GnssAdapter::stopTrackingCommand(LocationAPI* client, uint32_t id)
{
    LOC_LOGD("%s]: client %p id %u", __func__, client, id);

    struct MsgStopTracking : public LocMsg {
        GnssAdapter& mAdapter;
        LocApiBase& mApi;
        LocationAPI* mClient;
        uint32_t mSessionId;
        inline MsgStopTracking(GnssAdapter& adapter,
                               LocApiBase& api,
                               LocationAPI* client,
                               uint32_t sessionId) :
            LocMsg(),
            mAdapter(adapter),
            mApi(api),
            mClient(client),
            mSessionId(sessionId) {}
        inline virtual void proc() const {
            if (mAdapter.isTrackingSession(mClient, mSessionId)) {
                LocationError err = LOCATION_ERROR_SUCCESS;
                // Api doesn't support multiple clients for time based tracking, so mutiplex
                err = mAdapter.stopTrackingMultiplex(mClient, mSessionId);
                if (LOCATION_ERROR_SUCCESS == err) {
                    mAdapter.eraseTrackingSession(mClient, mSessionId);
                }
                mAdapter.reportResponse(mClient, err, mSessionId);
            }
            // we do not reportResponse for the case where there is no existing tracking session
            // for the client and id being used, since stopTrackingCommand can be sent to both
            // GnssAdapter & FlpAdapter by LocationAPI and we want to avoid incorrect error response

        }
    };

    sendMsg(new MsgStopTracking(*this, *mLocApi, client, id));
}

LocationError
GnssAdapter::stopTrackingMultiplex(LocationAPI* client, uint32_t id)
{
    LocationError err = LOCATION_ERROR_SUCCESS;

    if (1 == mTrackingSessions.size()) {
        err = stopTracking();
    } else {
        LocationSessionKey key(client, id);

        // get the session we are stopping
        auto it = mTrackingSessions.find(key);
        if (it != mTrackingSessions.end()) {
            // find the next smallest interval, other than the session we are stopping
            LocationOptions smallestIntervalOptions; // size will be zero until set for the first time
            for (auto it2 = mTrackingSessions.begin(); it2 != mTrackingSessions.end(); ++it2) {
                // if session is not the one we are stopping and either smallest interval is not set
                // or there is a new smallest interval, then set the new smallest interval
                if (it2->first != key && (0 == smallestIntervalOptions.size ||
                    it2->second.minInterval < smallestIntervalOptions.minInterval)) {
                     smallestIntervalOptions = it2->second;
                }
            }
            // if session we are stopping has smaller interval then next smallest
            if (it->second.minInterval < smallestIntervalOptions.minInterval) {
                // restart time based tracking with next smallest interval
                err = startTracking(smallestIntervalOptions);
            }
        }
    }

    return err;
}

LocationError
GnssAdapter::stopTracking()
{
    LocationError err = LOCATION_ERROR_SUCCESS;
    if (!mUlpProxy->sendStopFix()) {
        loc_api_adapter_err apiErr = mLocApi->stopFix();
        if (LOC_API_ADAPTER_ERR_SUCCESS == apiErr) {
            err = LOCATION_ERROR_SUCCESS;
        } else {
            err = LOCATION_ERROR_GENERAL_FAILURE;
        }
    }

    return err;
}

void
GnssAdapter::stopTrackingCommand()
{
    LOC_LOGD("%s]: ", __func__);

    struct MsgStopTracking : public LocMsg {
        GnssAdapter& mAdapter;
        LocApiBase& mApi;
        inline MsgStopTracking(GnssAdapter& adapter,
                               LocApiBase& api) :
            LocMsg(),
            mAdapter(adapter),
            mApi(api) {}
        inline virtual void proc() const {
            // clear the position mode
            LocPosMode mLocPosMode = {};
            mLocPosMode.mode = LOC_POSITION_MODE_INVALID;
            mAdapter.setUlpPositionMode(mLocPosMode);
            // don't need to multiplex because ULP will do that for us if it is present
            mApi.stopFix();
        }
    };

    sendMsg(new MsgStopTracking(*this, *mLocApi));
}

void
GnssAdapter::getZppCommand()
{
    LOC_LOGD("%s]: ", __func__);

    struct MsgGetZpp : public LocMsg {
        GnssAdapter& mAdapter;
        LocApiBase& mApi;
        inline MsgGetZpp(GnssAdapter& adapter,
                         LocApiBase& api) :
            LocMsg(),
            mAdapter(adapter),
            mApi(api) {}
        inline virtual void proc() const {
            UlpLocation location = {};
            LocPosTechMask techMask = LOC_POS_TECH_MASK_DEFAULT;
            GpsLocationExtended locationExtended = {};
            locationExtended.size = sizeof(locationExtended);

            mApi.getBestAvailableZppFix(location.gpsLocation, techMask);
            //Mark the location source as from ZPP
            location.gpsLocation.flags |= LOCATION_HAS_SOURCE_INFO;
            location.position_source = ULP_LOCATION_IS_FROM_ZPP;

            mAdapter.getUlpProxy()->reportPosition(location,
                                                   locationExtended,
                                                   LOC_SESS_SUCCESS,
                                                   techMask);
        }
    };

    sendMsg(new MsgGetZpp(*this, *mLocApi));
}

bool
GnssAdapter::hasNiNotifyCallback(LocationAPI* client)
{
    auto it = mClientData.find(client);
    return (it != mClientData.end() && it->second.gnssNiCb);
}

void
GnssAdapter::gnssNiResponseCommand(LocationAPI* client,
                                   uint32_t id,
                                   GnssNiResponse response)
{
    LOC_LOGD("%s]: client %p id %u response %u", __func__, client, id, response);

    struct MsgGnssNiResponse : public LocMsg {
        GnssAdapter& mAdapter;
        LocationAPI* mClient;
        uint32_t mSessionId;
        GnssNiResponse mResponse;
        inline MsgGnssNiResponse(GnssAdapter& adapter,
                                 LocationAPI* client,
                                 uint32_t sessionId,
                                 GnssNiResponse response) :
            LocMsg(),
            mAdapter(adapter),
            mClient(client),
            mSessionId(sessionId),
            mResponse(response) {}
        inline virtual void proc() const {
            NiData& niData = mAdapter.getNiData();
            LocationError err = LOCATION_ERROR_SUCCESS;
            if (!mAdapter.hasNiNotifyCallback(mClient)) {
                err = LOCATION_ERROR_ID_UNKNOWN;
            } else {
                NiSession* pSession = NULL;
                if (mSessionId == niData.sessionEs.reqID &&
                    NULL != niData.sessionEs.rawRequest) {
                    pSession = &niData.sessionEs;
                    // ignore any SUPL NI non-Es session if a SUPL NI ES is accepted
                    if (mResponse == GNSS_NI_RESPONSE_ACCEPT &&
                        NULL != niData.session.rawRequest) {
                            pthread_mutex_lock(&niData.session.tLock);
                            niData.session.resp = GNSS_NI_RESPONSE_IGNORE;
                            niData.session.respRecvd = true;
                            pthread_cond_signal(&niData.session.tCond);
                            pthread_mutex_unlock(&niData.session.tLock);
                    }
                } else if (mSessionId == niData.session.reqID &&
                    NULL != niData.session.rawRequest) {
                    pSession = &niData.session;
                }

                if (pSession) {
                    LOC_LOGI("%s]: gnssNiResponseCommand: send user mResponse %u for id %u",
                             __func__, mResponse, mSessionId);
                    pthread_mutex_lock(&pSession->tLock);
                    pSession->resp = mResponse;
                    pSession->respRecvd = true;
                    pthread_cond_signal(&pSession->tCond);
                    pthread_mutex_unlock(&pSession->tLock);
                } else {
                    err = LOCATION_ERROR_ID_UNKNOWN;
                    LOC_LOGE("%s]: gnssNiResponseCommand: id %u not an active session",
                             __func__, mSessionId);
                }
            }
            mAdapter.reportResponse(mClient, err, mSessionId);
        }
    };

    sendMsg(new MsgGnssNiResponse(*this, client, id, response));

}

void
GnssAdapter::gnssNiResponseCommand(GnssNiResponse response, void* rawRequest)
{
    LOC_LOGD("%s]: response %u", __func__, response);

    struct MsgGnssNiResponse : public LocMsg {
        LocApiBase& mApi;
        const GnssNiResponse mResponse;
        const void* mPayload;
        inline MsgGnssNiResponse(LocApiBase& api,
                                 const GnssNiResponse response,
                                 const void* rawRequest) :
            LocMsg(),
            mApi(api),
            mResponse(response),
            mPayload(rawRequest) {}
        inline virtual ~MsgGnssNiResponse() {
            // this is a bit weird since mPayload is not
            // allocated by this class.  But there is no better way.
            // mPayload actually won't be NULL here.
            free((void*)mPayload);
        }
        inline virtual void proc() const {
            mApi.informNiResponse(mResponse, mPayload);
        }
    };

    sendMsg(new MsgGnssNiResponse(*mLocApi, response, rawRequest));

}

uint32_t
GnssAdapter::enableCommand(LocationTechnologyType techType)
{
    uint32_t sessionId = generateSessionId();
    LOC_LOGD("%s]: id %u techType %u", __func__, sessionId, techType);

    struct MsgEnableGnss : public LocMsg {
        GnssAdapter& mAdapter;
        LocApiBase& mApi;
        ContextBase& mContext;
        uint32_t mSessionId;
        LocationTechnologyType mTechType;
        inline MsgEnableGnss(GnssAdapter& adapter,
                             LocApiBase& api,
                             ContextBase& context,
                             uint32_t sessionId,
                             LocationTechnologyType techType) :
            LocMsg(),
            mAdapter(adapter),
            mApi(api),
            mContext(context),
            mSessionId(sessionId),
            mTechType(techType) {}
        inline virtual void proc() const {
            LocationError err = LOCATION_ERROR_SUCCESS;
            uint32_t powerVoteId = mAdapter.getPowerVoteId();
            if (mTechType != LOCATION_TECHNOLOGY_TYPE_GNSS) {
                err = LOCATION_ERROR_INVALID_PARAMETER;
            } else if (powerVoteId > 0) {
                err = LOCATION_ERROR_ALREADY_STARTED;
            } else {
                mContext.modemPowerVote(true);
                mAdapter.setPowerVoteId(mSessionId);
                mApi.setGpsLock(GNSS_CONFIG_GPS_LOCK_NONE);
            }
            mAdapter.reportResponse(err, mSessionId);
        }
    };

    if (mContext != NULL) {
        sendMsg(new MsgEnableGnss(*this, *mLocApi, *mContext, sessionId, techType));
    } else {
        LOC_LOGE("%s]: Context is NULL", __func__);
    }

    return sessionId;
}

void
GnssAdapter::disableCommand(uint32_t id)
{
    LOC_LOGD("%s]: id %u", __func__, id);

    struct MsgDisableGnss : public LocMsg {
        GnssAdapter& mAdapter;
        LocApiBase& mApi;
        ContextBase& mContext;
        uint32_t mSessionId;
        inline MsgDisableGnss(GnssAdapter& adapter,
                             LocApiBase& api,
                             ContextBase& context,
                             uint32_t sessionId) :
            LocMsg(),
            mAdapter(adapter),
            mApi(api),
            mContext(context),
            mSessionId(sessionId) {}
        inline virtual void proc() const {
            LocationError err = LOCATION_ERROR_SUCCESS;
            uint32_t powerVoteId = mAdapter.getPowerVoteId();
            if (powerVoteId != mSessionId) {
                err = LOCATION_ERROR_ID_UNKNOWN;
            } else {
                mContext.modemPowerVote(false);
                mAdapter.setPowerVoteId(0);
                mApi.setGpsLock(mAdapter.convertGpsLock(ContextBase::mGps_conf.GPS_LOCK));
            }
            mAdapter.reportResponse(err, mSessionId);
        }
    };

    if (mContext != NULL) {
        sendMsg(new MsgDisableGnss(*this, *mLocApi, *mContext, id));
    }

}

void
GnssAdapter::reportPositionEvent(const UlpLocation& ulpLocation,
                                 const GpsLocationExtended& locationExtended,
                                 enum loc_sess_status status,
                                 LocPosTechMask techMask,
                                 bool fromUlp)
{
    LOC_LOGD("%s]: fromUlp %u status %u", __func__, fromUlp, status);

    // if this event is not called from ULP, then try to call into ULP and return if successfull
    if (!fromUlp) {
        if (mUlpProxy->reportPosition(ulpLocation, locationExtended,
                                 status, techMask)) {
            return;
        }
    }

    struct MsgReportPosition : public LocMsg {
        GnssAdapter& mAdapter;
        const UlpLocation mUlpLocation;
        const GpsLocationExtended mLocationExtended;
        loc_sess_status mStatus;
        LocPosTechMask mTechMask;
        inline MsgReportPosition(GnssAdapter& adapter,
                                 const UlpLocation& ulpLocation,
                                 const GpsLocationExtended& locationExtended,
                                 loc_sess_status status,
                                 LocPosTechMask techMask) :
            LocMsg(),
            mAdapter(adapter),
            mUlpLocation(ulpLocation),
            mLocationExtended(locationExtended),
            mStatus(status),
            mTechMask(techMask) {}
        inline virtual void proc() const {
            mAdapter.reportPosition(mUlpLocation, mLocationExtended, mStatus, mTechMask);
        }
    };

    sendMsg(new MsgReportPosition(*this, ulpLocation, locationExtended, status, techMask));
}

void
GnssAdapter::reportPosition(const UlpLocation& ulpLocation,
                            const GpsLocationExtended& locationExtended,
                            enum loc_sess_status status,
                            LocPosTechMask techMask)
{
    bool reported = false;
    if (LOC_SESS_FAILURE == status) {
        Location invalidLocation = {};
        invalidLocation.size = sizeof(Location);
        for (auto it=mClientData.begin(); it != mClientData.end(); ++it) {
            if (nullptr != it->second.trackingCb) {
                it->second.trackingCb(invalidLocation);
            }
        }
        reported = true;
    }
    // what's in the else if is... (line by line)
    // 1. this is a final fix; and
    //   1.1 it is a Satellite fix; or
    //   1.2 it is a sensor fix
    // 2. (must be intermediate fix... implicit)
    //   2.1 we accepte intermediate; and
    //   2.2 it is NOT the case that
    //   2.2.1 there is inaccuracy; and
    //   2.2.2 we care about inaccuracy; and
    //   2.2.3 the inaccuracy exceeds our tolerance
    else if ((LOC_SESS_SUCCESS == status &&
              ((LOC_POS_TECH_MASK_SATELLITE |
                LOC_POS_TECH_MASK_SENSORS   |
                LOC_POS_TECH_MASK_HYBRID) &
               techMask)) ||
             (LOC_SESS_INTERMEDIATE == ContextBase::mGps_conf.INTERMEDIATE_POS &&
              !((ulpLocation.gpsLocation.flags &
                 LOC_GPS_LOCATION_HAS_ACCURACY) &&
                (ContextBase::mGps_conf.ACCURACY_THRES != 0) &&
                (ulpLocation.gpsLocation.accuracy >
                 ContextBase::mGps_conf.ACCURACY_THRES)))) {
        if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_GNSS_SV_USED_DATA) {
            mGnssSvIdUsedInPosAvail = true;
            mGnssSvIdUsedInPosition = locationExtended.gnss_sv_used_ids;
        }
        for (auto it=mClientData.begin(); it != mClientData.end(); ++it) {
            if (nullptr != it->second.trackingCb) {
                Location location = {};
                convertLocation(location, ulpLocation.gpsLocation, techMask);
                it->second.trackingCb(location);
            }
            if (nullptr != it->second.gnssLocationInfoCb) {
                GnssLocationInfoNotification locationInfo = {};
                convertLocationInfo(locationInfo, locationExtended);
                it->second.gnssLocationInfoCb(locationInfo);
            }
        }
        reported = true;
    }

    if (NMEA_PROVIDER_AP == ContextBase::mGps_conf.NMEA_PROVIDER && !mTrackingSessions.empty()) {
        if (reported && status != LOC_SESS_FAILURE) {
            generateNmea(ulpLocation, locationExtended);
        } else {
            generateNmeaBlank();
        }
    }

    // Free the allocated memory for rawData
    UlpLocation* gp = (UlpLocation*)&(ulpLocation);
    if (gp != NULL && gp->rawData != NULL)
    {
        delete (char*)gp->rawData;
        gp->rawData = NULL;
        gp->rawDataSize = 0;
    }
}

void
GnssAdapter::reportSvEvent(const GnssSvNotification& svNotify,
                           bool fromUlp)
{
    LOC_LOGD("%s]: fromUlp %u", __func__, fromUlp);

    // if this event is not called from ULP, then try to call into ULP and return if successfull
    if (!fromUlp) {
        if (mUlpProxy->reportSv(svNotify)) {
            return;
        }
    }

    struct MsgReportSv : public LocMsg {
        GnssAdapter& mAdapter;
        const GnssSvNotification mSvNotify;
        inline MsgReportSv(GnssAdapter& adapter,
                           const GnssSvNotification& svNotify) :
            LocMsg(),
            mAdapter(adapter),
            mSvNotify(svNotify) {}
        inline virtual void proc() const {
            mAdapter.reportSv((GnssSvNotification&)mSvNotify);
        }
    };

    sendMsg(new MsgReportSv(*this, svNotify));
}

void
GnssAdapter::reportSv(GnssSvNotification& svNotify)
{
    if (mGnssSvIdUsedInPosAvail) {
        int numSv = svNotify.count;
        int16_t gnssSvId = 0;
        int prnMin = 0;
        uint64_t svUsedIdMask = 0;
        for (int i=0; i < numSv; i++) {
            gnssSvId = svNotify.gnssSvs[i].svId;
            if (gnssSvId <= GPS_SV_PRN_MAX) {
                svUsedIdMask = mGnssSvIdUsedInPosition.gps_sv_used_ids_mask;
                prnMin = GPS_SV_PRN_MIN;
            } else if ((gnssSvId >= GLO_SV_PRN_MIN) && (gnssSvId <= GLO_SV_PRN_MAX)) {
                svUsedIdMask = mGnssSvIdUsedInPosition.glo_sv_used_ids_mask;
                prnMin = GLO_SV_PRN_MIN;
            } else if ((gnssSvId >= BDS_SV_PRN_MIN) && (gnssSvId <= BDS_SV_PRN_MAX)) {
                svUsedIdMask = mGnssSvIdUsedInPosition.bds_sv_used_ids_mask;
                prnMin = BDS_SV_PRN_MIN;
            } else if ((gnssSvId >= GAL_SV_PRN_MIN) && (gnssSvId <= GAL_SV_PRN_MAX)) {
                svUsedIdMask = mGnssSvIdUsedInPosition.gal_sv_used_ids_mask;
                prnMin = GAL_SV_PRN_MIN;
            }

            // If SV ID was used in previous position fix, then set USED_IN_FIX
            // flag, else clear the USED_IN_FIX flag.
            if (svUsedIdMask & (1 << (gnssSvId - prnMin))) {
                svNotify.gnssSvs[i].gnssSvOptionsMask |= GNSS_SV_OPTIONS_USED_IN_FIX_BIT;
            } else {
                svNotify.gnssSvs[i].gnssSvOptionsMask &= ~GNSS_SV_OPTIONS_USED_IN_FIX_BIT;
            }
        }
    }

    for (auto it=mClientData.begin(); it != mClientData.end(); ++it) {
        if (nullptr != it->second.gnssSvCb) {
            it->second.gnssSvCb(svNotify);
        }
    }

    if (NMEA_PROVIDER_AP == ContextBase::mGps_conf.NMEA_PROVIDER && !mTrackingSessions.empty()) {
        generateNmea(svNotify);
    }

    mGnssSvIdUsedInPosAvail = false;
}

void
GnssAdapter::reportNmeaEvent(const char* nmea, size_t length, bool fromUlp)
{
    //LOC_LOGD("%s]: fromUlp %u", __func__, fromUlp);

    // if this event is not called from ULP, then try to call into ULP and return if successfull
    if (!fromUlp) {
        if (mUlpProxy->reportNmea(nmea, length)) {
            return;
        }
    }

    struct MsgReportNmea : public LocMsg {
        GnssAdapter& mAdapter;
        const char* mNmea;
        size_t mLength;
        inline MsgReportNmea(GnssAdapter& adapter,
                             const char* nmea,
                             size_t length) :
            LocMsg(),
            mAdapter(adapter),
            mNmea(new char[length]),
            mLength(length) {
                memcpy((void*)mNmea, (void*)nmea, length);
            }
        inline virtual ~MsgReportNmea()
        {
            delete[] mNmea;
        }
        inline virtual void proc() const {
            mAdapter.reportNmea(mNmea, mLength);
        }
    };

    sendMsg(new MsgReportNmea(*this, nmea, length));
}

void
GnssAdapter::reportNmea(const char* nmea, size_t length)
{
    GnssNmeaNotification nmeaNotification = {};
    nmeaNotification.size = sizeof(GnssNmeaNotification);

    struct timeval tv;
    gettimeofday(&tv, (struct timezone *) NULL);
    int64_t now = tv.tv_sec * 1000LL + tv.tv_usec / 1000;
    nmeaNotification.timestamp = now;
    nmeaNotification.nmea = nmea;
    nmeaNotification.length = length;

    for (auto it=mClientData.begin(); it != mClientData.end(); ++it) {
        if (nullptr != it->second.gnssNmeaCb) {
            it->second.gnssNmeaCb(nmeaNotification);
        }
    }

}

bool
GnssAdapter::requestNiNotifyEvent(const GnssNiNotification &notify, const void* data)
{
    LOC_LOGI("%s]: notif_type: %d, timeout: %d, default_resp: %d"
             "requestor_id: %s (encoding: %d) text: %s text (encoding: %d) extras: %s",
             __func__, notify.type, notify.timeout, notify.timeoutResponse,
             notify.requestor, notify.requestorEncoding,
             notify.message, notify.messageEncoding, notify.extras);

    struct MsgReportNiNotify : public LocMsg {
        GnssAdapter& mAdapter;
        const GnssNiNotification mNotify;
        const void* mData;
        inline MsgReportNiNotify(GnssAdapter& adapter,
                                 const GnssNiNotification& notify,
                                 const void* data) :
            LocMsg(),
            mAdapter(adapter),
            mNotify(notify),
            mData(data) {}
        inline virtual void proc() const {
            mAdapter.requestNiNotify(mNotify, mData);
        }
    };

    sendMsg(new MsgReportNiNotify(*this, notify, data));

    return true;
}

static void* niThreadProc(void *args)
{
    NiSession* pSession = (NiSession*)args;
    int rc = 0;          /* return code from pthread calls */

    struct timeval present_time;
    struct timespec expire_time;

    pthread_mutex_lock(&pSession->tLock);
    /* Calculate absolute expire time */
    gettimeofday(&present_time, NULL);
    expire_time.tv_sec  = present_time.tv_sec + pSession->respTimeLeft;
    expire_time.tv_nsec = present_time.tv_usec * 1000;
    LOC_LOGD("%s]: time out set for abs time %ld with delay %d sec",
             __func__, (long)expire_time.tv_sec, pSession->respTimeLeft);

    while (!pSession->respRecvd) {
        rc = pthread_cond_timedwait(&pSession->tCond,
                                    &pSession->tLock,
                                    &expire_time);
        if (rc == ETIMEDOUT) {
            pSession->resp = GNSS_NI_RESPONSE_NO_RESPONSE;
            LOC_LOGD("%s]: time out after valting for specified time. Ret Val %d",
                     __func__, rc);
            break;
        }
    }
    LOC_LOGD("%s]: Java layer has sent us a user response and return value from "
             "pthread_cond_timedwait = %d pSession->resp is %u", __func__, rc, pSession->resp);
    pSession->respRecvd = false; /* Reset the user response flag for the next session*/

    // adding this check to support modem restart, in which case, we need the thread
    // to exit without calling sending data. We made sure that rawRequest is NULL in
    // loc_eng_ni_reset_on_engine_restart()
    GnssAdapter* adapter = pSession->adapter;
    GnssNiResponse resp;
    void* rawRequest = NULL;
    bool sendResponse = false;

    if (NULL != pSession->rawRequest) {
        if (pSession->resp != GNSS_NI_RESPONSE_IGNORE) {
            resp = pSession->resp;
            rawRequest = pSession->rawRequest;
            sendResponse = true;
        } else {
            free(pSession->rawRequest);
        }
        pSession->rawRequest = NULL;
    }
    pthread_mutex_unlock(&pSession->tLock);

    pSession->respTimeLeft = 0;
    pSession->reqID = 0;

    if (sendResponse) {
        adapter->gnssNiResponseCommand(resp, rawRequest);
    }

    return NULL;
}

bool
GnssAdapter::requestNiNotify(const GnssNiNotification& notify, const void* data)
{
    NiSession* pSession = NULL;
    gnssNiCallback gnssNiCb = nullptr;

    for (auto it=mClientData.begin(); it != mClientData.end(); ++it) {
        if (nullptr != it->second.gnssNiCb) {
            gnssNiCb = it->second.gnssNiCb;
            break;
        }
    }
    if (nullptr == gnssNiCb) {
        EXIT_LOG(%s, "no clients with gnssNiCb.");
        return false;
    }

    if (notify.type == GNSS_NI_TYPE_EMERGENCY_SUPL) {
        if (NULL != mNiData.sessionEs.rawRequest) {
            LOC_LOGI("%s]: supl es NI in progress, new supl es NI ignored, type: %d",
                     __func__, notify.type);
            if (NULL != data) {
                free((void*)data);
            }
        } else {
            pSession = &mNiData.sessionEs;
        }
    } else {
        if (NULL != mNiData.session.rawRequest ||
            NULL != mNiData.sessionEs.rawRequest) {
            LOC_LOGI("%s]: supl NI in progress, new supl NI ignored, type: %d",
                     __func__, notify.type);
            if (NULL != data) {
                free((void*)data);
            }
        } else {
            pSession = &mNiData.session;
        }
    }

    if (pSession) {
        /* Save request */
        pSession->rawRequest = (void*)data;
        pSession->reqID = ++mNiData.reqIDCounter;
        pSession->adapter = this;

        int sessionId = pSession->reqID;

        /* For robustness, spawn a thread at this point to timeout to clear up the notification
         * status, even though the OEM layer in java does not do so.
         **/
        pSession->respTimeLeft =
             5 + (notify.timeout != 0 ? notify.timeout : LOC_NI_NO_RESPONSE_TIME);

        int rc = 0;
        rc = pthread_create(&pSession->thread, NULL, niThreadProc, pSession);
        if (rc) {
            LOC_LOGE("%s]: Loc NI thread is not created.", __func__);
        }
        rc = pthread_detach(pSession->thread);
        if (rc) {
            LOC_LOGE("%s]: Loc NI thread is not detached.", __func__);
        }

        if (nullptr != gnssNiCb) {
            gnssNiCb(sessionId, notify);
        }
    }

    return true;
}

void
GnssAdapter::reportGnssMeasurementDataEvent(const GnssMeasurementsNotification& measurementsNotify)
{
    LOC_LOGD("%s]: ", __func__);

    struct MsgReportGnssMeasurementData : public LocMsg {
        GnssAdapter& mAdapter;
        const GnssMeasurementsNotification mMeasurementsNotify;
        inline MsgReportGnssMeasurementData(GnssAdapter& adapter,
                                           const GnssMeasurementsNotification& measurementsNotify) :
            LocMsg(),
            mAdapter(adapter),
            mMeasurementsNotify(measurementsNotify) {}
        inline virtual void proc() const {
            mAdapter.reportGnssMeasurementData(mMeasurementsNotify);
        }
    };

    sendMsg(new MsgReportGnssMeasurementData(*this, measurementsNotify));
}

void
GnssAdapter::reportGnssMeasurementData(const GnssMeasurementsNotification& measurementsNotify)
{
    for (auto it=mClientData.begin(); it != mClientData.end(); ++it) {
        if (nullptr != it->second.gnssMeasurementsCb) {
            it->second.gnssMeasurementsCb(measurementsNotify);
        }
    }
}

void
GnssAdapter::reportSvMeasurementEvent(GnssSvMeasurementSet &svMeasurementSet)
{
    LOC_LOGD("%s]: ", __func__);

    // We send SvMeasurementSet to AmtProxy/ULPProxy to be forwarded as necessary.
    mUlpProxy->reportSvMeasurement(svMeasurementSet);
}

void
GnssAdapter::reportSvPolynomialEvent(GnssSvPolynomial &svPolynomial)
{
    LOC_LOGD("%s]: ", __func__);

    // We send SvMeasurementSet to AmtProxy/ULPProxy to be forwarded as necessary.
    mUlpProxy->reportSvPolynomial(svPolynomial);
}

int
GnssAdapter::nmeaPutChecksum(char *nmea, size_t maxSize)
{
    uint8_t checksum = 0;
    int length = 0;

    nmea++; //skip the $
    while (*nmea != '\0') {
        checksum ^= *nmea++;
        length++;
    }

    // length now contains nmea sentence string length not including $ sign.
    int checksumLength = snprintf(nmea,(maxSize-length-1),"*%02X\r\n", checksum);

    // total length of nmea sentence is length of nmea sentence inc $ sign plus
    // length of checksum (+1 is to cover the $ character in the length).
    return (length + checksumLength + 1);
}

void
GnssAdapter::generateNmea(const GnssSvNotification& svNotify)
{
    char sentence[NMEA_SENTENCE_MAX_LENGTH] = {0};

    // ------$GPGSV------
    NmeaSvMeta gpsSvMeta =
        {GNSS_SV_TYPE_GPS, "GP", 0, 0};
    generateNmeaGSV(svNotify, gpsSvMeta, sentence, sizeof(sentence));

    // ------$GLGSV------
    NmeaSvMeta gloSvMeta =
        {GNSS_SV_TYPE_GLONASS, "GL", 0, GLONASS_SV_ID_OFFSET};
    generateNmeaGSV(svNotify, gloSvMeta, sentence, sizeof(sentence));

    // ------$GAGSV------
    NmeaSvMeta galSvMeta =
        {GNSS_SV_TYPE_GALILEO, "GA", 0, 0};
    generateNmeaGSV(svNotify, galSvMeta, sentence, sizeof(sentence));
}

void
GnssAdapter::generateNmea(const UlpLocation& ulpLocation,
                          const GpsLocationExtended& locationExtended)
{

    char sentence[NMEA_SENTENCE_MAX_LENGTH] = {0};

    time_t utcTime(ulpLocation.gpsLocation.timestamp/1000);
    tm * pTm = gmtime(&utcTime);
    if (NULL == pTm) {
        LOC_LOGE("%s]: gmtime failed", __func__);
        return;
    }

    uint32_t svUsedCount = 0;
    uint32_t count = 0;
    bool isCombinedFix = (mGnssSvIdUsedInPosition.gps_sv_used_ids_mask ? 1 : 0) +
                         (mGnssSvIdUsedInPosition.glo_sv_used_ids_mask ? 1 : 0) +
                         (mGnssSvIdUsedInPosition.gal_sv_used_ids_mask ? 1 : 0) > 1;
    NmeaSvMeta gnssSvMeta =
        {GNSS_SV_TYPE_GPS, isCombinedFix ? "GN" : "GP",
         mGnssSvIdUsedInPosition.gps_sv_used_ids_mask, 0};

    // ---$GPGSA/$GNGSA---
    NmeaSvMeta gpsSvMeta =
        {GNSS_SV_TYPE_GPS, isCombinedFix ? "GN" : "GP",
         mGnssSvIdUsedInPosition.gps_sv_used_ids_mask, 0};
    count = generateNmeaGSA(locationExtended, gpsSvMeta, sentence, sizeof(sentence));
    if (count > 0) {
        svUsedCount += count;
        gnssSvMeta = gpsSvMeta;
    }

    // ---$GLGSA/$GNGSA---
    NmeaSvMeta gloSvMeta =
        {GNSS_SV_TYPE_GLONASS, isCombinedFix ? "GN" : "GL",
         mGnssSvIdUsedInPosition.glo_sv_used_ids_mask, GLONASS_SV_ID_OFFSET};
    count = generateNmeaGSA(locationExtended, gloSvMeta, sentence, sizeof(sentence));
    if (count > 0) {
        svUsedCount += count;
        gnssSvMeta = gloSvMeta;
    }

    // ---$GAGSA/$GNGSA---
    NmeaSvMeta galSvMeta =
        {GNSS_SV_TYPE_GALILEO, isCombinedFix ? "GN" : "GA",
         mGnssSvIdUsedInPosition.gal_sv_used_ids_mask, 0};
    count = generateNmeaGSA(locationExtended, galSvMeta, sentence, sizeof(sentence));
    if (count > 0) {
        svUsedCount += count;
        gnssSvMeta = galSvMeta;
    }

    // ---$GPVTG/$GLVTG/$GAVTG/$GNVTG---
    generateNmeaVTG(ulpLocation, locationExtended, gnssSvMeta,
                    sentence, sizeof(sentence));

    // ---$GPRMC/$GLRMC/$GARMC/$GNRMC---
    generateNmeaRMC(ulpLocation, locationExtended, gnssSvMeta,
                    *pTm, sentence, sizeof(sentence));

    // ---$GPGGA/$GLGGA/$GAGGA/$GNGGA---
    generateNmeaGGA(ulpLocation, locationExtended, gnssSvMeta,
                    *pTm, svUsedCount, sentence, sizeof(sentence));

}

void
GnssAdapter::generateNmeaBlank()
{
    char sentence[NMEA_SENTENCE_MAX_LENGTH] = {0};
    int length = 0;

    strlcpy(sentence, "$GPGSA,A,1,,,,,,,,,,,,,,,", sizeof(sentence));
    length = nmeaPutChecksum(sentence, sizeof(sentence));
    reportNmeaEvent(sentence, length);

    strlcpy(sentence, "$GNGSA,A,1,,,,,,,,,,,,,,,", sizeof(sentence));
    length = nmeaPutChecksum(sentence, sizeof(sentence));
    reportNmeaEvent(sentence, length);

    strlcpy(sentence, "$GPVTG,,T,,M,,N,,K,N", sizeof(sentence));
    length = nmeaPutChecksum(sentence, sizeof(sentence));
    reportNmeaEvent(sentence, length);

    strlcpy(sentence, "$GPRMC,,V,,,,,,,,,,N", sizeof(sentence));
    length = nmeaPutChecksum(sentence, sizeof(sentence));
    reportNmeaEvent(sentence, length);

    strlcpy(sentence, "$GPGGA,,,,,,0,,,,,,,,", sizeof(sentence));
    length = nmeaPutChecksum(sentence, sizeof(sentence));
    reportNmeaEvent(sentence, length);
}

void
GnssAdapter::generateNmeaGSV(const GnssSvNotification& svNotify, NmeaSvMeta& svMeta,
                             char* sentence, size_t size)
{
    if (!sentence || size == 0) {
        LOC_LOGE("%s]: NMEA Error invalid argument.", __func__);
        return;
    }

    char* pMarker = sentence;
    int lengthRemaining = size;
    int length = 0;
    int sentenceCount = 0;
    int sentenceNumber = 1;
    int svCount = 0;
    int sv = 1;

    for (sv=1; sv <= svNotify.count; sv++) {
        if (svMeta.svType == svNotify.gnssSvs[sv - 1].type) {
            // cache the used in fix mask, as it will be needed to send $GPGSA
            // during the position report
            if (LOC_GNSS_SV_FLAGS_USED_IN_FIX ==
                (svNotify.gnssSvs[sv - 1].gnssSvOptionsMask & GNSS_SV_OPTIONS_USED_IN_FIX_BIT)) {
                svCount++;
            }
        }
    }

    if (svCount == 0) {
        // no svs in view, so just send a blank $--GSV sentence
        snprintf(sentence, lengthRemaining, "$%sGSV,1,1,0,", svMeta.talker);
        length = nmeaPutChecksum(sentence, size);
        reportNmeaEvent(sentence, length);
        return;
    }

    sv = 1;
    sentenceNumber = 1;
    sentenceCount = svCount / 4 + (svCount % 4 != 0);

    while (sentenceNumber <= sentenceCount) {
        pMarker = sentence;
        lengthRemaining = size;

        length = snprintf(pMarker, lengthRemaining, "$%sGSV,%d,%d,%02d",
                          svMeta.talker, sentenceCount, sentenceNumber, svCount);

        if (length < 0 || length >= lengthRemaining) {
            LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);
            return;
        }
        pMarker += length;
        lengthRemaining -= length;

        for (int i=0; (sv <= svNotify.count) && (i < 4);  sv++) {
            if (svMeta.svType == svNotify.gnssSvs[sv - 1].type) {
                length = snprintf(pMarker, lengthRemaining,",%02d,%02d,%03d,",
                    svNotify.gnssSvs[sv - 1].svId,
                    (int)(0.5 + svNotify.gnssSvs[sv - 1].elevation), //float to int
                    (int)(0.5 + svNotify.gnssSvs[sv - 1].azimuth)); //float to int

                if (length < 0 || length >= lengthRemaining) {
                    LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);
                    return;
                }
                pMarker += length;
                lengthRemaining -= length;

                if (svNotify.gnssSvs[sv - 1].cN0Dbhz > 0) {
                    length = snprintf(pMarker, lengthRemaining,"%02d",
                        (int)(0.5 + svNotify.gnssSvs[sv - 1].cN0Dbhz)); //float to int

                    if (length < 0 || length >= lengthRemaining) {
                        LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);
                        return;
                    }
                    pMarker += length;
                    lengthRemaining -= length;
                }
                i++;
            }
        }

        length = nmeaPutChecksum(sentence, size);
        reportNmeaEvent(sentence, length);
        sentenceNumber++;
    }  //while
}

uint8_t
GnssAdapter::generateNmeaGSA(const GpsLocationExtended& locationExtended,
                             NmeaSvMeta& svMeta, char* sentence, size_t size)
{
    if (!sentence || size == 0) {
        LOC_LOGE("%s]: NMEA Error invalid arguments.", __func__);
        return 0;
    }

    char* pMarker = sentence;
    int lengthRemaining = size;
    int length = 0;

    uint8_t svUsedCount = 0;
    uint32_t svUsedList[32] = {0};

    char fixType = '\0';

    uint32_t svIdOffset = svMeta.svIdOffset;
    uint32_t mask = svMeta.mask;

    for (uint8_t i = 1; mask > 0 && svUsedCount < 32; i++) {
        if (mask & 1) {
            svUsedList[svUsedCount++] = i + svIdOffset;
        }
        mask = mask >> 1;
    }

    if (svUsedCount == 0 && LOC_GNSS_CONSTELLATION_GPS != svMeta.svType) {
        return 0;
    }

    if (svUsedCount == 0) {
        fixType = '1'; // no fix
    } else if (svUsedCount <= 3) {
        fixType = '2'; // 2D fix
    } else {
        fixType = '3'; // 3D fix
    }

    // Start printing the sentence
    // Format: $--GSA,a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,p.p,h.h,v.v*cc
    // a : Mode  : A : Automatic, allowed to automatically switch 2D/3D
    // x : Fixtype : 1 (no fix), 2 (2D fix), 3 (3D fix)
    // xx : 12 SV ID
    // p.p : Position DOP (Dilution of Precision)
    // h.h : Horizontal DOP
    // v.v : Vertical DOP
    // cc : Checksum value
    length = snprintf(pMarker, lengthRemaining, "$%sGSA,A,%c,", svMeta.talker, fixType);

    if (length < 0 || length >= lengthRemaining) {
        LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);;
        return 0;
    }
    pMarker += length;
    lengthRemaining -= length;

    // Add first 12 satellite IDs
    for (uint8_t i = 0; i < 12; i++) {
        if (i < svUsedCount) {
            length = snprintf(pMarker, lengthRemaining, "%02d,", svUsedList[i]);
        } else {
            length = snprintf(pMarker, lengthRemaining, ",");
        }
        if (length < 0 || length >= lengthRemaining) {
            LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);
            return 0;
        }
        pMarker += length;
        lengthRemaining -= length;
    }

    // Add the position/horizontal/vertical DOP values
    if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_DOP) {
        length = snprintf(pMarker, lengthRemaining, "%.1f,%.1f,%.1f",
                locationExtended.pdop,
                locationExtended.hdop,
                locationExtended.vdop);
    } else {
        length = snprintf(pMarker, lengthRemaining, ",,");
    }

    /* Sentence is ready, add checksum and broadcast */
    length = nmeaPutChecksum(sentence, size);
    reportNmeaEvent(sentence, length);

    return svUsedCount;
}

void
GnssAdapter::generateNmeaVTG(const UlpLocation& ulpLocation,
                             const GpsLocationExtended& locationExtended,
                             NmeaSvMeta& svMeta, char* sentence, size_t size)
{
    if (!sentence || size == 0) {
        LOC_LOGE("%s]: NMEA Error invalid arguments.", __func__);
        return;
    }

    char* pMarker = sentence;
    int lengthRemaining = size;
    int length = 0;

    if (ulpLocation.gpsLocation.flags & LOC_GPS_LOCATION_HAS_BEARING)
    {
        float magTrack = ulpLocation.gpsLocation.bearing;
        if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_MAG_DEV)
        {
            float magTrack = ulpLocation.gpsLocation.bearing - locationExtended.magneticDeviation;
            if (magTrack < 0.0)
                magTrack += 360.0;
            else if (magTrack > 360.0)
                magTrack -= 360.0;
        }

        length = snprintf(pMarker, lengthRemaining, "$%sVTG,%.1lf,T,%.1lf,M,",
                          svMeta.talker, ulpLocation.gpsLocation.bearing, magTrack);
    }
    else
    {
        length = snprintf(pMarker, lengthRemaining, "$%sVTG,,T,,M,", svMeta.talker);
    }

    if (length < 0 || length >= lengthRemaining)
    {
        LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);
        return;
    }
    pMarker += length;
    lengthRemaining -= length;

    if (ulpLocation.gpsLocation.flags & LOC_GPS_LOCATION_HAS_SPEED)
    {
        float speedKnots = ulpLocation.gpsLocation.speed * (3600.0/1852.0);
        float speedKmPerHour = ulpLocation.gpsLocation.speed * 3.6;

        length = snprintf(pMarker, lengthRemaining, "%.1lf,N,%.1lf,K,", speedKnots, speedKmPerHour);
    }
    else
    {
        length = snprintf(pMarker, lengthRemaining, ",N,,K,");
    }

    if (length < 0 || length >= lengthRemaining)
    {
        LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);
        return;
    }
    pMarker += length;
    lengthRemaining -= length;

    if (!(ulpLocation.gpsLocation.flags & LOC_GPS_LOCATION_HAS_LAT_LONG))
        length = snprintf(pMarker, lengthRemaining, "%c", 'N'); // N means no fix
    else if (GNSS_SUPL_MODE_STANDALONE == mSuplMode)
        length = snprintf(pMarker, lengthRemaining, "%c", 'A'); // A means autonomous
    else
        length = snprintf(pMarker, lengthRemaining, "%c", 'D'); // D means differential

    length = nmeaPutChecksum(sentence, size);
    reportNmeaEvent(sentence, length);
}

void
GnssAdapter::generateNmeaRMC(const UlpLocation& ulpLocation,
                             const GpsLocationExtended& locationExtended,
                             NmeaSvMeta& svMeta, tm& utcTime,
                             char* sentence, size_t size)
{
    if (!sentence || size == 0) {
        LOC_LOGE("NMEA Error invalid arguments.");
        return;
    }

    int utcYear = utcTime.tm_year % 100; // 2 digit year
    int utcMonth = utcTime.tm_mon + 1; // tm_mon starts at zero
    int utcDay = utcTime.tm_mday;
    int utcHours = utcTime.tm_hour;
    int utcMinutes = utcTime.tm_min;
    int utcSeconds = utcTime.tm_sec;
    int utcMSeconds = (ulpLocation.gpsLocation.timestamp)%1000;

    char* pMarker = sentence;
    int lengthRemaining = size;
    int length = 0;

    length = snprintf(pMarker, lengthRemaining, "$%sRMC,%02d%02d%02d.%02d,A," ,
                      svMeta.talker, utcHours, utcMinutes, utcSeconds,utcMSeconds/10);

    if (length < 0 || length >= lengthRemaining) {
        LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);
        return;
    }
    pMarker += length;
    lengthRemaining -= length;

    if (ulpLocation.gpsLocation.flags & LOC_GPS_LOCATION_HAS_LAT_LONG) {
        double latitude = ulpLocation.gpsLocation.latitude;
        double longitude = ulpLocation.gpsLocation.longitude;
        char latHemisphere;
        char lonHemisphere;
        double latMinutes;
        double lonMinutes;

        if (latitude > 0) {
            latHemisphere = 'N';
        } else {
            latHemisphere = 'S';
            latitude *= -1.0;
        }

        if (longitude < 0) {
            lonHemisphere = 'W';
            longitude *= -1.0;
        } else {
            lonHemisphere = 'E';
        }

        latMinutes = fmod(latitude * 60.0 , 60.0);
        lonMinutes = fmod(longitude * 60.0 , 60.0);

        length = snprintf(pMarker, lengthRemaining, "%02d%09.6lf,%c,%03d%09.6lf,%c,",
                          (uint8_t)floor(latitude), latMinutes, latHemisphere,
                          (uint8_t)floor(longitude),lonMinutes, lonHemisphere);
    } else {
        length = snprintf(pMarker, lengthRemaining,",,,,");
    }

    if (length < 0 || length >= lengthRemaining) {
        LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);
        return;
    }
    pMarker += length;
    lengthRemaining -= length;

    if (ulpLocation.gpsLocation.flags & LOC_GPS_LOCATION_HAS_SPEED) {
        float speedKnots = ulpLocation.gpsLocation.speed * (3600.0/1852.0);
        length = snprintf(pMarker, lengthRemaining, "%.1lf,", speedKnots);
    } else {
        length = snprintf(pMarker, lengthRemaining, ",");
    }

    if (length < 0 || length >= lengthRemaining) {
        LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);
        return;
    }
    pMarker += length;
    lengthRemaining -= length;

    if (ulpLocation.gpsLocation.flags & LOC_GPS_LOCATION_HAS_BEARING) {
        length = snprintf(pMarker, lengthRemaining, "%.1lf,", ulpLocation.gpsLocation.bearing);
    } else {
        length = snprintf(pMarker, lengthRemaining, ",");
    }

    if (length < 0 || length >= lengthRemaining) {
        LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);
        return;
    }
    pMarker += length;
    lengthRemaining -= length;

    length = snprintf(pMarker, lengthRemaining, "%2.2d%2.2d%2.2d,",
                      utcDay, utcMonth, utcYear);

    if (length < 0 || length >= lengthRemaining) {
        LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);
        return;
    }
    pMarker += length;
    lengthRemaining -= length;

    if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_MAG_DEV) {
        float magneticVariation = locationExtended.magneticDeviation;
        char direction;
        if (magneticVariation < 0.0) {
            direction = 'W';
            magneticVariation *= -1.0;
        } else {
            direction = 'E';
        }

        length = snprintf(pMarker, lengthRemaining, "%.1lf,%c,",
                          magneticVariation, direction);
    } else {
        length = snprintf(pMarker, lengthRemaining, ",,");
    }

    if (length < 0 || length >= lengthRemaining) {
        LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);
        return;
    }
    pMarker += length;
    lengthRemaining -= length;

    if (!(ulpLocation.gpsLocation.flags & LOC_GPS_LOCATION_HAS_LAT_LONG)) {
        length = snprintf(pMarker, lengthRemaining, "%c", 'N'); // N means no fix
    } else if (GNSS_SUPL_MODE_STANDALONE == mSuplMode) {
        length = snprintf(pMarker, lengthRemaining, "%c", 'A'); // A means autonomous
    } else {
        length = snprintf(pMarker, lengthRemaining, "%c", 'D'); // D means differential
    }

    length = nmeaPutChecksum(sentence, size);
    reportNmeaEvent(sentence, length);
}

void
GnssAdapter::generateNmeaGGA(const UlpLocation& ulpLocation,
                             const GpsLocationExtended& locationExtended,
                             NmeaSvMeta& svMeta, tm& utcTime, uint32_t svUsedCount,
                             char* sentence, size_t size)
{
    if (!sentence || size == 0) {
        LOC_LOGE("NMEA Error invalid arguments.");
        return;
    }

    int utcYear = utcTime.tm_year % 100; // 2 digit year
    int utcMonth = utcTime.tm_mon + 1; // tm_mon starts at zero
    int utcDay = utcTime.tm_mday;
    int utcHours = utcTime.tm_hour;
    int utcMinutes = utcTime.tm_min;
    int utcSeconds = utcTime.tm_sec;
    int utcMSeconds = (ulpLocation.gpsLocation.timestamp)%1000;

    char* pMarker = sentence;
    int lengthRemaining = size;
    int length = 0;

    length = snprintf(pMarker, lengthRemaining, "$%sGGA,%02d%02d%02d.%02d," ,
                      svMeta.talker, utcHours, utcMinutes, utcSeconds, utcMSeconds/10);

    if (length < 0 || length >= lengthRemaining) {
        LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);
        return;
    }
    pMarker += length;
    lengthRemaining -= length;

    if (ulpLocation.gpsLocation.flags & LOC_GPS_LOCATION_HAS_LAT_LONG) {
        double latitude = ulpLocation.gpsLocation.latitude;
        double longitude = ulpLocation.gpsLocation.longitude;
        char latHemisphere;
        char lonHemisphere;
        double latMinutes;
        double lonMinutes;

        if (latitude > 0) {
            latHemisphere = 'N';
        } else {
            latHemisphere = 'S';
            latitude *= -1.0;
        }

        if (longitude < 0) {
            lonHemisphere = 'W';
            longitude *= -1.0;
        } else {
            lonHemisphere = 'E';
        }

        latMinutes = fmod(latitude * 60.0 , 60.0);
        lonMinutes = fmod(longitude * 60.0 , 60.0);

        length = snprintf(pMarker, lengthRemaining, "%02d%09.6lf,%c,%03d%09.6lf,%c,",
                          (uint8_t)floor(latitude), latMinutes, latHemisphere,
                          (uint8_t)floor(longitude),lonMinutes, lonHemisphere);
    } else {
        length = snprintf(pMarker, lengthRemaining,",,,,");
    }

    if (length < 0 || length >= lengthRemaining) {
        LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);
        return;
    }
    pMarker += length;
    lengthRemaining -= length;

    char gpsQuality;
    if (!(ulpLocation.gpsLocation.flags & LOC_GPS_LOCATION_HAS_LAT_LONG)) {
        gpsQuality = '0'; // 0 means no fix
    } else if (GNSS_SUPL_MODE_STANDALONE == mSuplMode) {
        gpsQuality = '1'; // 1 means GPS fix
    } else {
        gpsQuality = '2'; // 2 means DGPS fix
    }

    // Number of satellites in use, 00-12
    if (svUsedCount > MAX_SATELLITES_IN_USE) {
        svUsedCount = MAX_SATELLITES_IN_USE;
    }

    // Add the position/horizontal/vertical DOP values
    if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_DOP) {
        length = snprintf(pMarker, lengthRemaining, "%c,%02d,%.1f,",
                          gpsQuality, svUsedCount, locationExtended.hdop);
    } else {
        length = snprintf(pMarker, lengthRemaining, "%c,%02d,,",
                          gpsQuality, svUsedCount);
    }

    if (length < 0 || length >= lengthRemaining) {
        LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);
        return;
    }
    pMarker += length;
    lengthRemaining -= length;

    if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_ALTITUDE_MEAN_SEA_LEVEL) {
        length = snprintf(pMarker, lengthRemaining, "%.1lf,M,",
                          locationExtended.altitudeMeanSeaLevel);
    } else {
        length = snprintf(pMarker, lengthRemaining,",,");
    }

    if (length < 0 || length >= lengthRemaining) {
        LOC_LOGE("%s:%d]: NMEA Error in string formatting", __func__, __LINE__);
        return;
    }
    pMarker += length;
    lengthRemaining -= length;

    if ((ulpLocation.gpsLocation.flags & LOC_GPS_LOCATION_HAS_ALTITUDE) &&
        (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_ALTITUDE_MEAN_SEA_LEVEL)) {
        length = snprintf(pMarker, lengthRemaining, "%.1lf,M,,",
                          ulpLocation.gpsLocation.altitude - locationExtended.altitudeMeanSeaLevel);
    } else {
        length = snprintf(pMarker, lengthRemaining,",,,");
    }

    length = nmeaPutChecksum(sentence, size);
    reportNmeaEvent(sentence, length);
}

/* INIT LOC AGPS MANAGER */
void GnssAdapter::initAgpsCommand(void* statusV4Cb){

    LOC_LOGI("GnssAdapter::initAgpsCommand");

    /* Set ATL open/close callbacks */
    AgpsAtlOpenStatusCb atlOpenStatusCb =
            [this](int handle, int isSuccess, char* apn,
                    AGpsBearerType bearerType, AGpsExtType agpsType) {

                mLocApi->atlOpenStatus(
                        handle, isSuccess, apn, bearerType, agpsType);
            };
    AgpsAtlCloseStatusCb atlCloseStatusCb =
            [this](int handle, int isSuccess) {

                mLocApi->atlCloseStatus(handle, isSuccess);
            };

    /* Register DS Client APIs */
    AgpsDSClientInitFn dsClientInitFn =
            [this](bool isDueToSSR) {

                return mLocApi->initDataServiceClient(isDueToSSR);
            };

    AgpsDSClientOpenAndStartDataCallFn dsClientOpenAndStartDataCallFn =
            [this] {

                return mLocApi->openAndStartDataCall();
            };

    AgpsDSClientStopDataCallFn dsClientStopDataCallFn =
            [this] {

                mLocApi->stopDataCall();
            };

    AgpsDSClientCloseDataCallFn dsClientCloseDataCallFn =
            [this] {

                mLocApi->closeDataCall();
            };

    AgpsDSClientReleaseFn dsClientReleaseFn =
            [this] {

                mLocApi->releaseDataServiceClient();
            };

    /* Send Msg function */
    SendMsgToAdapterMsgQueueFn sendMsgFn =
            [this](LocMsg* msg) {

                sendMsg(msg);
            };

    /* Message to initialize AGPS module */
    struct AgpsMsgInit: public LocMsg {

        AgpsManager* mAgpsManager;

        AgpsFrameworkInterface::AgnssStatusIpV4Cb mFrameworkStatusV4Cb;

        AgpsAtlOpenStatusCb mAtlOpenStatusCb;
        AgpsAtlCloseStatusCb mAtlCloseStatusCb;

        AgpsDSClientInitFn mDSClientInitFn;
        AgpsDSClientOpenAndStartDataCallFn mDSClientOpenAndStartDataCallFn;
        AgpsDSClientStopDataCallFn mDSClientStopDataCallFn;
        AgpsDSClientCloseDataCallFn mDSClientCloseDataCallFn;
        AgpsDSClientReleaseFn mDSClientReleaseFn;

        SendMsgToAdapterMsgQueueFn mSendMsgFn;

        inline AgpsMsgInit(AgpsManager* agpsManager,
                AgpsFrameworkInterface::AgnssStatusIpV4Cb frameworkStatusV4Cb,
                AgpsAtlOpenStatusCb atlOpenStatusCb,
                AgpsAtlCloseStatusCb atlCloseStatusCb,
                AgpsDSClientInitFn dsClientInitFn,
                AgpsDSClientOpenAndStartDataCallFn dsClientOpenAndStartDataCallFn,
                AgpsDSClientStopDataCallFn dsClientStopDataCallFn,
                AgpsDSClientCloseDataCallFn dsClientCloseDataCallFn,
                AgpsDSClientReleaseFn dsClientReleaseFn,
                SendMsgToAdapterMsgQueueFn sendMsgFn) :
                LocMsg(), mAgpsManager(agpsManager), mFrameworkStatusV4Cb(
                        frameworkStatusV4Cb), mAtlOpenStatusCb(atlOpenStatusCb), mAtlCloseStatusCb(
                        atlCloseStatusCb), mDSClientInitFn(dsClientInitFn), mDSClientOpenAndStartDataCallFn(
                        dsClientOpenAndStartDataCallFn), mDSClientStopDataCallFn(
                        dsClientStopDataCallFn), mDSClientCloseDataCallFn(
                        dsClientCloseDataCallFn), mDSClientReleaseFn(
                        dsClientReleaseFn), mSendMsgFn(sendMsgFn) {

            LOC_LOGV("AgpsMsgInit");
        }

        inline virtual void proc() const {

            LOC_LOGV("AgpsMsgInit::proc()");

            mAgpsManager->registerCallbacks(mFrameworkStatusV4Cb, mAtlOpenStatusCb,
                    mAtlCloseStatusCb, mDSClientInitFn,
                    mDSClientOpenAndStartDataCallFn, mDSClientStopDataCallFn,
                    mDSClientCloseDataCallFn, mDSClientReleaseFn, mSendMsgFn);

            mAgpsManager->createAgpsStateMachines();
        }
    };

    /* Send message to initialize AGPS Manager */
    sendMsg(new AgpsMsgInit(
                &mAgpsManager,
                (AgpsFrameworkInterface::AgnssStatusIpV4Cb)statusV4Cb,
                atlOpenStatusCb, atlCloseStatusCb,
                dsClientInitFn, dsClientOpenAndStartDataCallFn,
                dsClientStopDataCallFn, dsClientCloseDataCallFn,
                dsClientReleaseFn,
                sendMsgFn));
}

/* GnssAdapter::requestATL
 * Method triggered in QMI thread as part of handling below message:
 * eQMI_LOC_SERVER_REQUEST_OPEN_V02
 * Triggers the AGPS state machine to setup AGPS call for below WWAN types:
 * eQMI_LOC_WWAN_TYPE_INTERNET_V02
 * eQMI_LOC_WWAN_TYPE_AGNSS_V02 */
bool GnssAdapter::requestATL(int connHandle, LocAGpsType agpsType){

    LOC_LOGI("GnssAdapter::requestATL");

    sendMsg( new AgpsMsgRequestATL(
             &mAgpsManager, connHandle, (AGpsExtType)agpsType));

    return true;
}

/* GnssAdapter::requestSuplES
 * Method triggered in QMI thread as part of handling below message:
 * eQMI_LOC_SERVER_REQUEST_OPEN_V02
 * Triggers the AGPS state machine to setup AGPS call for below WWAN types:
 * eQMI_LOC_WWAN_TYPE_AGNSS_EMERGENCY_V02 */
bool GnssAdapter::requestSuplES(int connHandle){

    LOC_LOGI("GnssAdapter::requestSuplES");

    sendMsg( new AgpsMsgRequestATL(
             &mAgpsManager, connHandle, LOC_AGPS_TYPE_SUPL_ES));

    return true;
}

/* GnssAdapter::releaseATL
 * Method triggered in QMI thread as part of handling below message:
 * eQMI_LOC_SERVER_REQUEST_CLOSE_V02
 * Triggers teardown of an existing AGPS call */
bool GnssAdapter::releaseATL(int connHandle){

    LOC_LOGI("GnssAdapter::releaseATL");

    /* Release SUPL/INTERNET/SUPL_ES ATL */
    struct AgpsMsgReleaseATL: public LocMsg {

        AgpsManager* mAgpsManager;
        int mConnHandle;

        inline AgpsMsgReleaseATL(AgpsManager* agpsManager, int connHandle) :
                LocMsg(), mAgpsManager(agpsManager), mConnHandle(connHandle) {

            LOC_LOGV("AgpsMsgReleaseATL");
        }

        inline virtual void proc() const {

            LOC_LOGV("AgpsMsgReleaseATL::proc()");
            mAgpsManager->releaseATL(mConnHandle);
        }
    };

    sendMsg( new AgpsMsgReleaseATL(&mAgpsManager, connHandle));

    return true;
}

/* GnssAdapter::reportDataCallOpened
 * DS Client data call opened successfully.
 * Send message to AGPS Manager to handle. */
bool GnssAdapter::reportDataCallOpened(){

    LOC_LOGI("GnssAdapter::reportDataCallOpened");

    struct AgpsMsgSuplEsOpened: public LocMsg {

        AgpsManager* mAgpsManager;

        inline AgpsMsgSuplEsOpened(AgpsManager* agpsManager) :
                LocMsg(), mAgpsManager(agpsManager) {

            LOC_LOGV("AgpsMsgSuplEsOpened");
        }

        inline virtual void proc() const {

            LOC_LOGV("AgpsMsgSuplEsOpened::proc()");
            mAgpsManager->reportDataCallOpened();
        }
    };

    sendMsg( new AgpsMsgSuplEsOpened(&mAgpsManager));

    return true;
}

/* GnssAdapter::reportDataCallClosed
 * DS Client data call closed.
 * Send message to AGPS Manager to handle. */
bool GnssAdapter::reportDataCallClosed(){

    LOC_LOGI("GnssAdapter::reportDataCallClosed");

    struct AgpsMsgSuplEsClosed: public LocMsg {

        AgpsManager* mAgpsManager;

        inline AgpsMsgSuplEsClosed(AgpsManager* agpsManager) :
                LocMsg(), mAgpsManager(agpsManager) {

            LOC_LOGV("AgpsMsgSuplEsClosed");
        }

        inline virtual void proc() const {

            LOC_LOGV("AgpsMsgSuplEsClosed::proc()");
            mAgpsManager->reportDataCallClosed();
        }
    };

    sendMsg( new AgpsMsgSuplEsClosed(&mAgpsManager));

    return true;
}

void GnssAdapter::dataConnOpenCommand(
        AGpsExtType agpsType,
        const char* apnName, int apnLen, LocApnIpType ipType){

    LOC_LOGI("GnssAdapter::frameworkDataConnOpen");

    struct AgpsMsgAtlOpenSuccess: public LocMsg {

        AgpsManager* mAgpsManager;
        AGpsExtType mAgpsType;
        char* mApnName;
        int mApnLen;
        LocApnIpType mIpType;

        inline AgpsMsgAtlOpenSuccess(AgpsManager* agpsManager, AGpsExtType agpsType,
                const char* apnName, int apnLen, LocApnIpType ipType) :
                LocMsg(), mAgpsManager(agpsManager), mAgpsType(agpsType), mApnName(
                        new char[apnLen + 1]), mApnLen(apnLen), mIpType(ipType) {

            LOC_LOGV("AgpsMsgAtlOpenSuccess");
            memcpy(mApnName, apnName, apnLen);
            mApnName[apnLen] = 0;
        }

        inline ~AgpsMsgAtlOpenSuccess() {
            delete[] mApnName;
        }

        inline virtual void proc() const {

            LOC_LOGV("AgpsMsgAtlOpenSuccess::proc()");
            mAgpsManager->reportAtlOpenSuccess(mAgpsType, mApnName, mApnLen,
                    mIpType);
        }
    };

    sendMsg( new AgpsMsgAtlOpenSuccess(
            &mAgpsManager, (AGpsExtType)agpsType, apnName, apnLen, ipType));
}

void GnssAdapter::dataConnClosedCommand(AGpsExtType agpsType){

    LOC_LOGI("GnssAdapter::frameworkDataConnClosed");

    struct AgpsMsgAtlClosed: public LocMsg {

        AgpsManager* mAgpsManager;
        AGpsExtType mAgpsType;

        inline AgpsMsgAtlClosed(AgpsManager* agpsManager, AGpsExtType agpsType) :
                LocMsg(), mAgpsManager(agpsManager), mAgpsType(agpsType) {

            LOC_LOGV("AgpsMsgAtlClosed");
        }

        inline virtual void proc() const {

            LOC_LOGV("AgpsMsgAtlClosed::proc()");
            mAgpsManager->reportAtlClosed(mAgpsType);
        }
    };

    sendMsg( new AgpsMsgAtlClosed(&mAgpsManager, (AGpsExtType)agpsType));
}

void GnssAdapter::dataConnFailedCommand(AGpsExtType agpsType){

    LOC_LOGI("GnssAdapter::frameworkDataConnFailed");

    struct AgpsMsgAtlOpenFailed: public LocMsg {

        AgpsManager* mAgpsManager;
        AGpsExtType mAgpsType;

        inline AgpsMsgAtlOpenFailed(AgpsManager* agpsManager, AGpsExtType agpsType) :
                LocMsg(), mAgpsManager(agpsManager), mAgpsType(agpsType) {

            LOC_LOGV("AgpsMsgAtlOpenFailed");
        }

        inline virtual void proc() const {

            LOC_LOGV("AgpsMsgAtlOpenFailed::proc()");
            mAgpsManager->reportAtlOpenFailed(mAgpsType);
        }
    };

    sendMsg( new AgpsMsgAtlOpenFailed(&mAgpsManager, (AGpsExtType)agpsType));
}