path: root/src/MTS_IO_QuectelRadio.cpp

/*
 * Copyright (C) 2019 by Multi-Tech Systems
 *
 * This file is part of libmts-io.
 *
 * libmts-io is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * libmts-io is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with libmts-io.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "mts/MTS_IO_QuectelRadio.h"

#include <mts/MTS_Logger.h>
#include <mts/MTS_Thread.h>
#include <mts/MTS_Text.h>

#include <unistd.h>

using namespace MTS::IO;

const size_t QuectelRadio::FILE_CHUNK_SIZE = 1024;
const std::string QuectelRadio::CMD_ABORT_UPLOAD = "+++";

// It is strongly recommended to use DOS 8.3 file name format for <filename>.
const std::string QuectelRadio::VALUE_MTS_DELTA_NAME = "mtsdelta.zip";
const std::string QuectelRadio::VALUE_MTS_DELTA_PATH =  "/data/ufs/" + QuectelRadio::VALUE_MTS_DELTA_NAME;

QuectelRadio::QuectelRadio(const std::string& sName, const std::string& sRadioPort)
: CellularRadio (sName, sRadioPort)
{
}

bool QuectelRadio::resetRadio(uint32_t iTimeoutMillis) {
    printInfo("%s| Rebooting radio", getName().c_str());
    if(sendBasicCommand("AT+CFUN=1,1") == SUCCESS) {
        if(iTimeoutMillis > 5000) {
            MTS::Thread::sleep(5000);
            iTimeoutMillis -= 5000;
        }
        return resetConnection(iTimeoutMillis);
    }

    return false;
}

ICellularRadio::CODE QuectelRadio::getModel(std::string& sModel) {
    printTrace("%s| Get Model", getName().c_str());
    //Always returns SUCCESS because the model should be m_sName
    sModel = getName();
    std::string sCmd("AT+GMM");
    std::string sResult = sendCommand(sCmd);
    if (sResult.find("OK") == std::string::npos) {
        printWarning("%s| Unable to get model from radio.  Returning [%s]", getName().c_str(), getName().c_str());
        return SUCCESS;
    } else {
        sModel = extractModelFromResult(sResult);
        if(sModel.size() == 0) {
            printWarning("%s| Unable to get model from radio.  Returning [%s]", getName().c_str(), getName().c_str());
            return SUCCESS;
        }
    }

    printDebug("%s| Extracted [%s] from [%s] query", getName().c_str(), sModel.c_str(), sCmd.c_str());
    if(sModel != getName()) {
        printWarning("%s| Model identified [%s] does not match expected [%s]. Returning [%s]",
                     getName().c_str(),  sModel.c_str(), getName().c_str(), sModel.c_str());
    }

    return SUCCESS;
}

ICellularRadio::CODE QuectelRadio::getIccid(std::string& sIccid) {
    printTrace("%s| Get ICCID", getName().c_str());
    sIccid = ICellularRadio::VALUE_NOT_SUPPORTED;

    // AT+QCCID execution can take up to 300ms according to the datasheet. Setting timeout to 500ms just for sure.
    std::string sCmd("AT+QCCID");
    std::string sResult = sendCommand(sCmd, DEFAULT_BAIL_STRINGS, 500);

    size_t end = sResult.find(ICellularRadio::RSP_OK);
    if (end == std::string::npos) {
        printWarning("%s| Unable to get ICCID from radio using command [%s]", getName().c_str(), sCmd.c_str());
        return FAILURE;
    }

    size_t start = sResult.find("+QCCID:");
    if(start != std::string::npos) {
        start += sizeof("+QCCID:");
        sIccid = MTS::Text::trim(sResult.substr(start, end-start));
        if(sIccid.size() == 0) {
            printWarning("%s| Unable to get ICCID from radio using command [%s]", getName().c_str(), sCmd.c_str());
            return FAILURE;
        }
    }
    return SUCCESS;
}

ICellularRadio::CODE QuectelRadio::getService(std::string& sService) {
    printTrace("%s| Get Service", getName().c_str());
    sService = ICellularRadio::VALUE_NOT_SUPPORTED;
    std::string sCmd("AT+COPS?");
    std::string sResult = sendCommand(sCmd);
    size_t end = sResult.find(ICellularRadio::RSP_OK);
    if (end == std::string::npos) {
        printWarning("%s| Unable to get Service from radio using command [%s]", getName().c_str(), sCmd.c_str());
        return FAILURE;
    }

    size_t start = sResult.find(":") + 1; //Position right after "+COPS:"
    std::vector<std::string> vParts = MTS::Text::split(MTS::Text::trim(sResult.substr(start, end-start)), ',');

    int32_t iAccessTechnology;

    // +COPS: <mode>[,<format>[,<oper>][,<Act>]]
    if (vParts.size() < 4 || !MTS::Text::parse(iAccessTechnology, vParts[3])) {
        printWarning("%s| Unable to get Service from radio using command [%s]", getName().c_str(), sCmd.c_str());
        return FAILURE;
    }

    switch(iAccessTechnology) {
        case   0 : sService = "GPRS"  ; break;  // GSM
        case   2 : sService = "WCDMA" ; break;  // UTRAN
        case   3 : sService = "EGPRS" ; break;  // GSM W/EGPRS
        case   4 : sService = "HSDPA" ; break;  // UTRAN W/HSDPA
        case   5 : sService = "WCDMA" ; break;  // UTRAN W/HSUPA
        case   6 : sService = "HSDPA" ; break;  // UTRAN W/HSDPA and HSUPA
        case   7 : sService = "LTE"   ; break;  // E-UTRAN
        case 100 : sService = "CDMA"  ; break;  // CDMA

        default: sService = ICellularRadio::VALUE_UNKNOWN; break;
    }

    printDebug("%s| Service ID: [%d][%s]", getName().c_str(), iAccessTechnology, sService.c_str());

    return SUCCESS;
}

ICellularRadio::CODE QuectelRadio::getNetwork(std::string& sNetwork) {
    /*
     * TODO: Refactor using MccMncTable once it'll be corrected.
     *
     * The proper way to determine the current network is to do that
     * by MCC and MNC fetched from the `getNetworkStatus` and `AT+QENG` command.
     * By using MCC and MNC from `AT+QENG` we can fetch the name of the network
     * reported by a currently connected base station even if the SIM card is
     * not installed or if we are currently working is a roaming mode.
     *
     * Until MccMncTable implementation is not fixed, we are using the name
     * of a currently selected operator (AT+COPS).
     */
    printTrace("%s| Get Network", getName().c_str());
    sNetwork = ICellularRadio::VALUE_NOT_SUPPORTED;
    std::string sCmd("AT+COPS?");
    std::string sResult = sendCommand(sCmd);
    size_t end = sResult.find(ICellularRadio::RSP_OK);

    if (end == std::string::npos) {
        printWarning("%s| Unable to get network name from radio using command [%s]", getName().c_str(), sCmd.c_str());
        return FAILURE;
    }

    // +COPS: <mode>[, <format>, <oper>,<AcT>]
    // +COPS: vParts[0],vParts[1],vParts[2],vParts[3]
    size_t start = sResult.find(":") + 1; //Position right after "+COPS:"
    std::vector<std::string> vParts = MTS::Text::split(MTS::Text::trim(sResult.substr(start)), ",");

    if(vParts.size() > 3) {
        const std::string sValue = vParts[2];

        // +COPS: 0,0,"CHN-UNICOM UNICOM",7
        //             ^start    ^end
        // +COPS: 0,0,"AT&T",7
        //             ^st ^end
        size_t start = sValue.find("\"") + 1;
        size_t end = sValue.find_first_of(" \"", start);
        sNetwork = sValue.substr(start, end-start);
    } else {
        sNetwork = "";  // Not connected to any network
    }

    return SUCCESS;
}

/*  AT+QENG="servingcell" - Query the information of serving cells

    (GSM network)
    +QENG:"servingscell",<state>,"GSM",<mcc>,<mnc>,<lac>,<cellid>,<bsic>,<arfcn>,<band>,<rxlev>,<txp>,<rla>,<drx>,<c1>,<c2>,<gprs>,<tch>,<ts>,<ta>,<maio>,<hsn>,<rxlevsub>,<rxlevfull>,<rxqualsub>,<rxqualfull>,<voicecodec>

    (WCDMA network)
    +QENG:"servingcell",<state>,"WCDMA",<mcc>,<mnc>,<lac>,<cellid>,<uarfcn>,<psc>,<rac>,<rscp>,<ecio>,<phych>,<sf>,<slot>,<speech_code>,<comMod>

    (LTE Network)
    +QENG:"servingcell",<state>,"LTE",<is_tdd>,<mcc>,<mnc>,<cellid>,<pcid>,<earfcn>,<freq_band_ind>,<ul_bandwidth>,<dl_bandwidth>,<tac>,<rsrp>,<rsrq>,<rssi>,<sinr>,<srxlev>

    The following modes are NOT currently handled:
    - TD-SCDMA mode;
    - CDMA mode;
    - HDR mode;
    - SRLTE mode.

    In the case of TD-SCDMA mode:
    +QENG:"servingscell",<state>,"TDSCDMA",<mcc>,<mnc>,<lac>,<cellid>,<pfreq>,<rssi>,<rscp>,<ecio>

    In the case of CDMA mode or CDMA+HDR mode:
    +QENG:"servingscell",<state>,"CDMA",<mcc>,<mnc>,<lac>,<cellid>,<bcch>,<rxpwr>,<ecio>,<txpwr>
    [+QENG:"servingscell",<state>,"HDR",<mcc>,<mnc>,<lac>,<cellid>,<bcch>,<rxpwr>,<ecio>,<txpwr>]

    In the case of SRLTE mode:
    +QENG:"servingscell",<state>,"CDMA",<mcc>,<mnc>,<lac>,<cellid>,<bcch>,<rxpwr>,<ecio>,<txpwr>
    +QENG:"servingcell",<state>,"LTE",<is_tdd>,<mcc>,<mnc>,<cellid>,<pcid>,<earfcn>,<freq_band_ind>,<ul_bandwidth>,<dl_bandwidth>,<tac>,<rsrp>,<rsrq>,<rssi>,<sinr><srxlev>
*/
CellularRadio::CODE QuectelRadio::getNetworkStatus(Json::Value& jData) {
    const std::string RAT_GSM = "GSM";
    const std::string RAT_WCDMA = "WCDMA";
    const std::string RAT_LTE = "LTE";

    ACTIVEBAND abnd;
    SERVICEDOMAIN sd;
    std::string sValue;
    std::string sRat;  // Radio Access Technology which is currently used

    printTrace("%s| Get Network Status", getName().c_str());

    //Always get common network stats because this should never fail
    //This way the basic stats are always returned even if AT+QENG fails below
    getCommonNetworkStats(jData);

    // IMSI is not provided by AT+QENG. Fetch it separately to keep the same interface
    if (getImsi(sValue) == SUCCESS) {
        jData[ICellularRadio::KEY_IMSI] = sValue;
    }

    // Network Name is not explicitly provided by AT+QENG. Fetch it separately to keep the same interface
    // TODO: Replace with lookup by MCC and MNC once MccMncTable is fixed.
    if (getNetwork(sValue) == SUCCESS) {
        jData[ICellularRadio::KEY_NETWORK] = sValue;
    }

    std::string sCmd;
    std::string sResult;

    sCmd = "AT+QENG=\"servingcell\"";
    sResult = sendCommand(sCmd, DEFAULT_BAIL_STRINGS, 200);
    if (sResult.find("+QENG: \"servingcell\"") == std::string::npos) {
        printDebug("%s| Network Status command returned unexpected response: [%s][%s]", getName().c_str(), sCmd.c_str(), sResult.c_str());
        printTrace("%s| Network Status:\n%s\n", getName().c_str(), jData.toStyledString().c_str());
        return SUCCESS; //return SUCCESS because getCommonNetworkStats() succeeded at top of this function
    }

    size_t start = sResult.find(":") + 1; //Position right after "+QENG:"
    size_t end = sResult.rfind(ICellularRadio::RSP_OK);
    std::vector<std::string> vParts = MTS::Text::split(MTS::Text::trim(sResult.substr(start, end-start)), ",");
    Json::Value jDebug;
    Json::Value jQuectelDebug;

    if (vParts.size() < 3) {
        printDebug("%s| Network Status command reponse is an unknown format: [%s][%s]", getName().c_str(), sCmd.c_str(), sResult.c_str());
        printTrace("%s| Network Status:\n%s\n", getName().c_str(), jData.toStyledString().c_str());
        return SUCCESS; //return SUCCESS because getCommonNetworkStats() succeeded at top of this function
    } else {
        // UE state and Access technology, Quectel-specific information
        jQuectelDebug["state"] = vParts[1];

        sRat = MTS::Text::trim(vParts[2], '"');
        jQuectelDebug["rat"] = sRat;
    }

    // +QENG:"servingscell",<state>,"GSM",<mcc>,<mnc>,<lac>,<cellid>,<bsic>,<arfcn>,<band>,<rxlev>,<txp>,<rla>,<drx>,<c1>,<c2>,<gprs>,<tch>,<ts>,<ta>,<maio>,<hsn>,<rxlevsub>,<rxlevfull>,<rxqualsub>,<rxqualfull>,<voicecodec>
    // +QENG:           [0],    [1],  [2],  [3],  [4],  [5],     [6],   [7],    [8],   [9],   [10], [11], [12], [13],[14],[15],  [16], [17],[18],[19],  [20], [21],      [22],       [23],       [24],        [25],        [26]
    if (sRat == RAT_GSM) {
        //Parse as GSM Network Format
        jData[ICellularRadio::KEY_MCC] = vParts[3];
        jData[ICellularRadio::KEY_MNC] = vParts[4];
        jData[ICellularRadio::KEY_LAC] = vParts[5];
        jData[ICellularRadio::KEY_CID] = vParts[6];
        jQuectelDebug["bsic"] = vParts[7];
        jData[ICellularRadio::KEY_CHANNEL] = vParts[8];

        if (convertToActiveBand(vParts[9], abnd) == SUCCESS && convertActiveBandToString(abnd, sValue) == SUCCESS) {
            jData[ICellularRadio::KEY_ABND] = sValue;
        }

        jData[ICellularRadio::KEY_RSSIDBM] = vParts[10];  // Values already negative. No need to substract 111 as stated in a datasheet
        jData[ICellularRadio::KEY_TXPWR] = vParts[11];
        jQuectelDebug["rla"] = vParts[12];
        jQuectelDebug["drx"] = vParts[13];
        jQuectelDebug["c1"] = vParts[14];
        jQuectelDebug["c2"] = vParts[15];
        jQuectelDebug["gprs"] = vParts[16];
        jQuectelDebug["tch"] = vParts[17];
        jQuectelDebug["ts"] = vParts[18];
        jQuectelDebug["ta"] = vParts[19];
        jQuectelDebug["maio"] = vParts[20];
        jQuectelDebug["hsn"] = vParts[21];
        jQuectelDebug["rxlevsub"] = vParts[22];
        jQuectelDebug["rxlevfull"] = vParts[23];
        jQuectelDebug["rxqualsub"] = vParts[24];
        jQuectelDebug["rxqualfull"] = vParts[25];
        jQuectelDebug["voicecodec"] = vParts[26];

        // Service Domain is not provided by AT+QENG. Fetch it separately to keep the same interface
        if (getServiceDomain(sd) == SUCCESS && convertServiceDomainToString(sd, sValue) == SUCCESS) {
            jData[ICellularRadio::KEY_SD] = sValue;
        }

        // The following fields can NOT be fetched for Quectel in GSM mode: RAC, MM, RR, NOM

        jData["quectelDebug"] = jQuectelDebug;
    }

    // +QENG:"servingcell",<state>,"WCDMA",<mcc>,<mnc>,<lac>,<cellid>,<uarfcn>,<psc>,<rac>,<rscp>,<ecio>,<phych>,<sf>,<slot>,<speech_code>,<comMod>
    // +QENG:          [0],    [1],    [2],  [3],  [4],  [5],     [6],     [7],  [8],  [9],  [10],  [11],   [12],[13],  [14],         [15],    [16]
    else if(sRat == RAT_WCDMA) {
        //Parse as WCDMA Network Format
        jData[ICellularRadio::KEY_MCC] = vParts[3];
        jData[ICellularRadio::KEY_MNC] = vParts[4];
        jData[ICellularRadio::KEY_LAC] = vParts[5];
        jData[ICellularRadio::KEY_CID] = vParts[6];
        jData[ICellularRadio::KEY_CHANNEL] = vParts[7];
        jDebug[ICellularRadio::KEY_PSC] = vParts[8];
        jData[ICellularRadio::KEY_RAC] = vParts[9];
        jDebug[ICellularRadio::KEY_RSCP] = vParts[10];
        jDebug[ICellularRadio::KEY_ECIO] = vParts[11];
        jQuectelDebug["phych"] = vParts[12];
        jQuectelDebug["sf"] = vParts[13];
        jQuectelDebug["slot"] = vParts[14];
        jQuectelDebug["speechCode"] = vParts[15];
        jQuectelDebug["comMod"] = vParts[16];

        // The following fields can NOT be fetched for Quectel in WCDMA mode: TXPWR, DRX, MM, RR, NOM, BLER

        // RSSI is not provided by AT+QENG in WCDMA mode. It was filled above by the getCommonNetworkStats

        // Service Domain is not provided by AT+QENG. Fetch it separately to keep the same interface
        if (getServiceDomain(sd) == SUCCESS && convertServiceDomainToString(sd, sValue) == SUCCESS) {
            jDebug[ICellularRadio::KEY_SD] = sValue;
        }

        // BLER is not provided by AT+QENG. Set to constant
        jDebug[ICellularRadio::KEY_BLER] = "000";

        // Get the radio band given the channel (UARFCN)
        RadioBandMap radioBandMap(vParts[7], ICellularRadio::VALUE_TYPE_CDMA);
        jData[ICellularRadio::KEY_ABND] = radioBandMap.getRadioBandName();

        jData["quectelDebug"] = jQuectelDebug;
        jData[ICellularRadio::KEY_DEBUG] = jDebug;
    }

    // +QENG:"servingcell",<state>,"LTE",<is_tdd>,<mcc>,<mnc>,<cellid>,<pcid>,<earfcn>,<freq_band_ind>,<ul_bandwidth>,<dl_bandwidth>,<tac>,<rsrp>,<rsrq>,<rssi>,<sinr>,<srxlev>
    // +QENG:          [0],    [1],  [2],     [3],  [4],  [5],     [6],   [7],     [8],            [9],          [10],          [11], [12],  [13],  [14],  [15],   [16],   [17]
    else if(sRat == RAT_LTE) {
        //Parse as LTE Network Format
        jQuectelDebug["isTdd"] = vParts[3];
        jData[ICellularRadio::KEY_MCC] = vParts[4];
        jData[ICellularRadio::KEY_MNC] = vParts[5];
        jData[ICellularRadio::KEY_CID] = vParts[6];
        jQuectelDebug["pcid"] = vParts[7];
        jData[ICellularRadio::KEY_CHANNEL] = vParts[8];
        jQuectelDebug["freqBandInd"] = vParts[9];
        jQuectelDebug["ulBandwidth"] = vParts[10];
        jQuectelDebug["dlBandwidth"] = vParts[11];
        jData["tac"] = vParts[12];
        jDebug["rsrp"] = vParts[13];
        jDebug["rsrq"] = vParts[14];
        jDebug[ICellularRadio::KEY_RSSIDBM] = vParts[15];
        jQuectelDebug["sinr"] = vParts[16];
        jQuectelDebug["srxlev"] = vParts[17];

        // Get the radio band given the channel (EARFCN)
        RadioBandMap radioBandMap(vParts[8], ICellularRadio::VALUE_TYPE_LTE);
        jData[ICellularRadio::KEY_ABND] = radioBandMap.getRadioBandName();

        // Service Domain is not provided by AT+QENG. Fetch it separately to keep the same interface
        if (getServiceDomain(sd) == SUCCESS && convertServiceDomainToString(sd, sValue) == SUCCESS) {
            jDebug[ICellularRadio::KEY_SD] = sValue;
        }

        // LAC is not provided by AT+QENG in WCDMA mode. Use another command instead
        jData[ICellularRadio::KEY_LAC] = queryLteLac();

        jData["quectelDebug"] = jQuectelDebug;
        jData[ICellularRadio::KEY_DEBUG] = jDebug;
    }

    printTrace("%s| Network Status:\n%s\n", getName().c_str(), jData.toStyledString().c_str());
    return SUCCESS;
}

ICellularRadio::CODE QuectelRadio::convertSignalStrengthTodBm(const int32_t& iRssi, int32_t& iDbm) {
    int dbmSteps, minValue, maxValue, rssiOffset;
    int rawDbm;

    if(iRssi >= 0 && iRssi < 99) {
        // normal scaling
        dbmSteps   =  2;
        minValue   = -113;
        maxValue   = -51;
        rssiOffset =  0;
    } else if(iRssi >= 100 && iRssi < 199) {
        // TD-SCDMA scaling
        dbmSteps   =  1;
        minValue   = -116;
        maxValue   = -25;
        rssiOffset =  100;
    } else {
        return FAILURE;  // invalid, not known or not detectable
    }

    rawDbm = minValue + ((iRssi - rssiOffset) * dbmSteps);
    iDbm = std::min(maxValue, rawDbm);

    return SUCCESS;
}

ICellularRadio::CODE QuectelRadio::convertdBmToSignalStrength(const int32_t& iDBm, int32_t& iRssi) {
    //Quectel Conversion FOR NORMAL SCALING
    const int dbmSteps   =  2;
    const int minValue   = -113;
    const int rssiOffset =  0;

    if (iDBm < -113) {
        iRssi = 0;
    } else if (iDBm > -51) {
        iRssi = 31;
    } else {
        iRssi = ((iDBm - minValue) / dbmSteps) + rssiOffset;
    }

    return SUCCESS;
}

ICellularRadio::CODE QuectelRadio::setMdn(const Json::Value& jArgs) {
    printTrace("%s| Set MDN", getName().c_str());
    return NOT_APPLICABLE;
}

ICellularRadio::CODE QuectelRadio::uploadDeltaFirmwareFile(int fd, ICellularRadio::UpdateCb& stepCb) {
    CODE rc = FAILURE;
    bool bIsFilePresent = false;

    do {
        rc = checkFile(bIsFilePresent, VALUE_MTS_DELTA_NAME);
        if (rc != SUCCESS) {
            printError("Failed to check if the delta file was already uploaded.");
            break;
        }

        if (bIsFilePresent) {
            rc = removeDeltaFirmwareFile();
        }

        if (rc != SUCCESS) {
            printError("Failed to remove the previous delta file.");
            break;
        }

        rc = uploadFile(fd, VALUE_MTS_DELTA_NAME, stepCb);
        if (rc != SUCCESS) {
            printError("Failed to upload the delta file.");
            break;
        }

    } while (false);

    return rc;
}

ICellularRadio::CODE QuectelRadio::removeDeltaFirmwareFile() {
    printTrace("Removing the delta upgrade file: %s", VALUE_MTS_DELTA_NAME.c_str());
    return removeFile(VALUE_MTS_DELTA_NAME);
}

ICellularRadio::CODE QuectelRadio::applyDeltaFirmwareFile(ICellularRadio::UpdateCb& stepCb) {
    return ERROR;  // not implemented
}

ICellularRadio::CODE QuectelRadio::getServiceDomain(ICellularRadio::SERVICEDOMAIN& sd) {
    printTrace("%s| Get Service Domain", getName().c_str());

    std::string sCmd("AT+QCFG=\"servicedomain\"");
    std::string sResult = sendCommand(sCmd);
    size_t end = sResult.find(ICellularRadio::RSP_OK);

    if (end == std::string::npos) {
        printWarning("%s| Unable to get service domain using command [%s]", getName().c_str(), sCmd.c_str());
        return FAILURE;
    }

    // +QCFG: "servicedomain",<service>
    size_t start = sResult.find(",") + 1;  // Position right after comma
    std::string sServiceDomain = MTS::Text::trim(sResult.substr(start, end-start));
    int iValue = -1;

    if (!MTS::Text::parse(iValue, sServiceDomain)) {
        printWarning("%s| Failed to parse service domain from command output [%s]", getName().c_str(), sCmd.c_str());
        return FAILURE;
    }

    switch (iValue) {
        case 0: sd = SERVICEDOMAIN::CS_ONLY; break;
        case 1: sd = SERVICEDOMAIN::PS_ONLY; break;
        case 2: sd = SERVICEDOMAIN::CSPS; break;

        default: return FAILURE;  // Unknown
    }

    return SUCCESS;
}

ICellularRadio::CODE QuectelRadio::getIsSimInserted(bool& bData) {
    printTrace("%s| Get SIM insertion status", getName().c_str());

    // AT+QSIMSTAT? execution can take up to 300ms according to the datasheet. Setting timeout to 500ms just for sure.
    std::string sCmd("AT+QSIMSTAT?");
    std::string sResult = sendCommand(sCmd, DEFAULT_BAIL_STRINGS, 500);

    const std::string sPrefix = "+QSIMSTAT: ";
    size_t start = sResult.find(sPrefix);
    size_t end = sResult.rfind(ICellularRadio::RSP_OK);

    if (end == std::string::npos) {
        printWarning("%s| Unable to get SIM insertion status from radio using command [%s]", getName().c_str(), sCmd.c_str());
        return FAILURE;
    }

    if (start == std::string::npos) {
        printDebug("%s| AT+QSIMSTAT? returned unexpected response: [%s][%s]", getName().c_str(), sCmd.c_str(), sResult.c_str());
        return FAILURE;
    }

    // +QSIMSTAT: <enable>,<inserted_status>
    start += sPrefix.size();
    std::vector<std::string> vParts = MTS::Text::split(MTS::Text::trim(sResult.substr(start, end-start)), ',');

    if(vParts.size() != 2) {
        printWarning("%s| Unable to parse SIM insertion status from response [%s]", getName().c_str(), sResult.c_str());
        return FAILURE;
    }

    if (vParts[1] == "1") {  // Inserted
        bData = true;
    } else {   // Removed or Unknown, before (U)SIM initialization
        bData = false;
    }

    return SUCCESS;
}

ICellularRadio::CODE QuectelRadio::getSimLockAttempts(int& iAttemptsPin, int& iAttemptsPuk) {
    printTrace("%s| Get SIM unlock attempts left", getName().c_str());

    // AT+QPINC execution can take more time that expected. Set timeout to 2s just to be sure.
    std::string sCmd("AT+QPINC=\"SC\"");
    std::string sResult = sendCommand(sCmd, DEFAULT_BAIL_STRINGS, 2000);

    const std::string sPrefix = "+QPINC: \"SC\",";
    size_t start = sResult.find(sPrefix);
    size_t end = sResult.rfind(ICellularRadio::RSP_OK);

    if (end == std::string::npos) {
        printWarning("%s| Unable to get SIM unlock attempts from radio using command [%s]", getName().c_str(), sCmd.c_str());
        return FAILURE;
    }

    if (start == std::string::npos) {
        printDebug("%s| AT+QPINC returned unexpected response: [%s][%s]", getName().c_str(), sCmd.c_str(), sResult.c_str());
        return FAILURE;
    }

    // +QPINC: <facility>,<pincounter>,<pukcounter>
    //         [x]       ,[0]         ,[1]
    start += sPrefix.size();
    std::vector<std::string> vParts = MTS::Text::split(MTS::Text::trim(sResult.substr(start, end-start)), ',');

    if(vParts.size() != 2) {
        printWarning("%s| Unable to parse SIM unlock attempts left from response [%s]", getName().c_str(), sResult.c_str());
        return FAILURE;
    }

    if (!MTS::Text::parse(iAttemptsPin, vParts[0])) {
        printWarning("%s| Unable to parse SIM PIM unlock attempts from response [%s]", getName().c_str(), sResult.c_str());
        return FAILURE;
    }

    if (!MTS::Text::parse(iAttemptsPuk, vParts[1])) {
        printWarning("%s| Unable to parse SIM PUK unlock attempts from response [%s]", getName().c_str(), sResult.c_str());
        return FAILURE;
    }

    return SUCCESS;
}

ICellularRadio::CODE QuectelRadio::convertToActiveBand(const std::string& sQuectelBand, ICellularRadio::ACTIVEBAND& band) {
    int iQuectelBand = -1;

    if (!MTS::Text::parse(iQuectelBand, sQuectelBand)) {
         return FAILURE;  // probably "-", other band
    }

    switch (iQuectelBand) {
        case 0: band = ACTIVEBAND::DCS_1800; break;
        case 1: band = ACTIVEBAND::PCS_1900; break;

        default: return FAILURE;  // actually, this case should never happen
    }

    return SUCCESS;
}

ICellularRadio::CODE QuectelRadio::uploadFile(int fd, const std::string& sTargetFilename, ICellularRadio::UpdateCb& stepCb) {
    size_t dPayloadLenght;
    size_t nChunks;
    CODE rc;

    rc = getFileSize(fd, dPayloadLenght, nChunks);
    if (rc != SUCCESS) {
        return rc;
    }
    printTrace("File size: %d bytes and %d chunks", dPayloadLenght, nChunks);
    printTrace("Starting file upload...");

    rc = startFileUpload(sTargetFilename, dPayloadLenght);
    if (rc != SUCCESS) {
        return rc;
    }

    printTrace("File upload started.");
    if (stepCb) {
        stepCb(Json::Value("FILE info: Started file upload for " + sTargetFilename));
    }

    uint16_t dChecksum = 0;
    size_t nChunksPerCent = (nChunks / 100) + 1;
    size_t nFragmentLenght = 0;
    std::array<char, FILE_CHUNK_SIZE> vBuffer;

    for (size_t iChunk = 1; iChunk < (nChunks + 1); iChunk++) {

        rc = readChunk(fd, vBuffer.data(), vBuffer.size(), nFragmentLenght);
        if (rc != SUCCESS) {
            break;
        }

        // we got our fragment, calculate checksum and flush the data
        uint16_t dFragmentChecksum = getQuectelChecksum(vBuffer.data(), nFragmentLenght);
        updateQuectelChecksum(dChecksum, dFragmentChecksum);

        rc = sendData(vBuffer.data(), nFragmentLenght);
        if (rc != SUCCESS) {
            break;
        }

        if (stepCb && ((iChunk % nChunksPerCent) == 0)) {
            size_t dPercentsCompleted = iChunk / nChunksPerCent;
            stepCb(Json::Value("FILE info: Uploaded " + MTS::Text::format(dPercentsCompleted) + "%"));
        }

    }

    if (rc != SUCCESS) {
        // cancel upload and terminate
        stepCb(Json::Value("FILE error: Upload failed due to internal error"));
        abortFileUpload();
        return rc;
    }

    printTrace("Waiting for acknoledge from the radio");
    std::string sExpectedResult = "+QFUPL: ";
    sExpectedResult += MTS::Text::format(dPayloadLenght);
    sExpectedResult += ",";
    sExpectedResult += MTS::Text::toLowerCase(MTS::Text::formatHex(dChecksum));

    // "send" empty string to read acknoledge string
    std::string sResult = sendCommand("", DEFAULT_BAIL_STRINGS, 3000, 0x00);

    if (sResult.find(sExpectedResult) != std::string::npos) {
        printDebug("Radio returned: [%s]", sResult.c_str());
        printTrace("Upload finished, checksum matched");
    } else {
        printError("Upload failed: checksum mismatch. Expected: [%s], Actual: [%s]", sExpectedResult.c_str(), sResult.c_str());
        abortFileUpload();
        rc = FAILURE;
    }

    if (stepCb && rc == SUCCESS) {
        stepCb(Json::Value("FILE info: Upload finished successfully"));
    } else if (stepCb) {
        stepCb(Json::Value("FILE error: Upload failed due to internal error"));
    }

    return rc;
}

ICellularRadio::CODE QuectelRadio::removeFile(const std::string& sTargetFilename) {
    printTrace("Removing file [%s] from the radio memory", sTargetFilename.c_str());

    const int dTimeout = 1000; //ms
    const std::string sCmd = "AT+QFDEL=\"" + sTargetFilename + "\"";

    std::string sResult = sendCommand(sCmd, ICellularRadio::DEFAULT_BAIL_STRINGS, dTimeout);
    if (sResult.find(ICellularRadio::RSP_OK) == std::string::npos) {
        printError("Failed to remove file [%s]: [%s]", sTargetFilename.c_str(), sResult.c_str());
        return FAILURE;
    }

    printTrace("File [%s] removed", sTargetFilename.c_str());
    return SUCCESS;
}

ICellularRadio::CODE QuectelRadio::checkFile(bool& bIsFilePresent, const std::string& sTargetFilename) {
    printTrace("Checking status of the [%s] file", sTargetFilename.c_str());

    const int dTimeout = 1000; //ms
    const std::string sCmd = "AT+QFLST";  // list all files in the UFS memory

    std::string sResult = sendCommand(sCmd, ICellularRadio::DEFAULT_BAIL_STRINGS, dTimeout);
    if (sResult.rfind(ICellularRadio::RSP_OK) == std::string::npos) {
        printError("Unable to list files from the radio memory: [%s]", sResult.c_str());
        return FAILURE;
    }

    const std::string sExpected = "+QFLST: \"UFS:" + sTargetFilename + "\"";
    bIsFilePresent = (sResult.find(sExpected) != std::string::npos);

    return SUCCESS;
}

uint16_t QuectelRadio::getQuectelChecksum(const void* data, size_t nBytes) {
    auto castData = static_cast<const uint8_t*>(data);
    uint16_t iChecksum = 0;

    for (size_t i = 0; i < nBytes; i += 2) {
        // If the number of the characters is odd, set the last character as the high 8 bit, and the low 8 bit as 0,
        // and then use an XOR operator to calculate the checksum.
        uint8_t high = castData[i];
        uint8_t low = (i < nBytes) ? (castData[i+1]) : (0);

        uint16_t iFragment = bytesToUint16(high, low);
        updateQuectelChecksum(iChecksum, iFragment);
    }

    return iChecksum;
}

ICellularRadio::CODE QuectelRadio::getFileSize(int fd, size_t& nBytes, size_t& nChunks) {
    CODE rc = FAILURE;

    do {
        ssize_t dScrollPos;
        dScrollPos = lseek(fd, 0, SEEK_SET);
        if (dScrollPos < 0) {
            printError("Failed to seek to the start of the file: %d", errno);
            break;
        }

        dScrollPos = lseek(fd, 0, SEEK_END);
        if (dScrollPos < 0) {
            printError("Failed to determine the file size: %d", errno);
            break;
        }

        nBytes = static_cast<size_t>(dScrollPos);
        nChunks = (nBytes + FILE_CHUNK_SIZE - 1) / FILE_CHUNK_SIZE;  // round up

        rc = SUCCESS;

    } while (false);

    lseek(fd, 0, SEEK_SET);
    return rc;
}

ICellularRadio::CODE QuectelRadio::readChunk(int fd, char* pChunk, size_t dChunkSize, size_t& nReadBytes) {
    size_t nUsedBuffer = 0;
    CODE rc = FAILURE;

    while (true) {

        if (nUsedBuffer > dChunkSize) {
            printError("Internal pointer error, abort upload: %d", nUsedBuffer);
            rc = ERROR;
            break;
        }

        if (nUsedBuffer == dChunkSize) {
            // full chunk received
            rc = SUCCESS;
            nReadBytes = dChunkSize;
            break;
        }

        char* pData = pChunk + nUsedBuffer;
        size_t nFreeBuffer = dChunkSize - nUsedBuffer;

        ssize_t dReadCount = read(fd, pData, nFreeBuffer);
        if (dReadCount < 0) {
            printError("Failed to read from the source file: %d", errno);
            rc = ERROR;
            break;
        }

        size_t duReadCount = static_cast<size_t>(dReadCount);
        if (duReadCount == 0) {
            // EOF. Return what was already read
            nReadBytes = nUsedBuffer;
            rc = SUCCESS;
            break;
        }

        nUsedBuffer += duReadCount;

    }

    return rc;
}

ICellularRadio::CODE QuectelRadio::startFileUpload(const std::string& sTargetFilename, size_t nBytes) {
    const std::vector<std::string> vBailStrings{ ICellularRadio::RSP_CONNECT, ICellularRadio::RSP_ERROR };
    const int dTimeout = 1000; //ms
    std::string sCommand, sResult;

    sCommand = "AT+QFUPL=\"";
    sCommand += sTargetFilename;
    sCommand += "\",";
    sCommand += MTS::Text::format(nBytes);

    sResult = sendCommand(sCommand, vBailStrings, dTimeout);
    if (sResult.find(ICellularRadio::RSP_CONNECT) == std::string::npos) {
        printError("Radio is not ready to accept the file: [%s]", sResult.c_str());
        return FAILURE;
    }

    return SUCCESS;
}

ICellularRadio::CODE QuectelRadio::abortFileUpload() {
    /*
     * To prevent the “+++” from being mistaken for data, the following sequence should be followed:
     * 1) Do not input any character within 1s or longer before inputting “+++”.
     * 2) Input “+++” within 1s, and no other characters can be inputted during the time.
     * 3) Do not input any character within 1s after “+++” has been inputted.
     */
    sleep(1);
    return sendBasicCommand(CMD_ABORT_UPLOAD, 2000);
}