Diff: plans/ChannelPlan_KR920.cpp

Revision:

82:0f5a742a08cd

Child:

118:64f20bc150dd

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plans/ChannelPlan_KR920.cpp	Mon Jun 19 16:03:40 2017 -0500
@@ -0,0 +1,977 @@
+/**********************************************************************
+* COPYRIGHT 2016 MULTI-TECH SYSTEMS, INC.
+*
+* ALL RIGHTS RESERVED BY AND FOR THE EXCLUSIVE BENEFIT OF
+* MULTI-TECH SYSTEMS, INC.
+*
+* MULTI-TECH SYSTEMS, INC. - CONFIDENTIAL AND PROPRIETARY
+* INFORMATION AND/OR TRADE SECRET.
+*
+* NOTICE: ALL CODE, PROGRAM, INFORMATION, SCRIPT, INSTRUCTION,
+* DATA, AND COMMENT HEREIN IS AND SHALL REMAIN THE CONFIDENTIAL
+* INFORMATION AND PROPERTY OF MULTI-TECH SYSTEMS, INC.
+* USE AND DISCLOSURE THEREOF, EXCEPT AS STRICTLY AUTHORIZED IN A
+* WRITTEN AGREEMENT SIGNED BY MULTI-TECH SYSTEMS, INC. IS PROHIBITED.
+*
+***********************************************************************/
+
+#include "ChannelPlan_KR920.h"
+#include "limits.h"
+
+using namespace lora;
+
+// MWF - changed KR920 to match final 1.0.2 regional spec
+const uint8_t ChannelPlan_KR920::KR920_TX_POWERS[] = { 14, 12, 10, 8, 6, 4, 2, 0 };
+const uint8_t ChannelPlan_KR920::KR920_RADIO_POWERS[] = { 3, 3, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 18, 19, 20 };
+const uint8_t ChannelPlan_KR920::KR920_MAX_PAYLOAD_SIZE[] = { 65, 151, 242, 242, 242, 242, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+const uint8_t ChannelPlan_KR920::KR920_MAX_PAYLOAD_SIZE_REPEATER[] = { 45, 131, 222, 222, 222, 222, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+
+ChannelPlan_KR920::ChannelPlan_KR920()
+:
+    ChannelPlan(NULL, NULL)
+{
+
+}
+
+ChannelPlan_KR920::ChannelPlan_KR920(Settings* settings)
+:
+    ChannelPlan(NULL, settings)
+{
+
+}
+
+ChannelPlan_KR920::ChannelPlan_KR920(SxRadio* radio, Settings* settings)
+:
+    ChannelPlan(radio, settings)
+{
+
+}
+
+ChannelPlan_KR920::~ChannelPlan_KR920() {
+
+}
+
+void ChannelPlan_KR920::Init() {
+
+    _datarates.clear();
+    _channels.clear();
+    _dutyBands.clear();
+
+    DutyBand band;
+
+    band.Index = 0;
+    band.DutyCycle = 0;
+
+    Datarate dr;
+
+    _plan = KR920;
+    _planName = "KR920";
+    _maxTxPower = 14;
+    _minTxPower = 0;
+
+    _minFrequency = 920900000;
+    _maxFrequency = 923300000;
+
+    DefaultLBT();
+
+    TX_POWERS = KR920_TX_POWERS;
+    RADIO_POWERS = KR920_RADIO_POWERS;
+    MAX_PAYLOAD_SIZE = KR920_MAX_PAYLOAD_SIZE;
+    MAX_PAYLOAD_SIZE_REPEATER = KR920_MAX_PAYLOAD_SIZE_REPEATER;
+
+    _minDatarate = 0;
+    _maxDatarate = 5;
+
+    _minRx2Datarate = DR_0;
+    _maxRx2Datarate = DR_5;
+
+    _minDatarateOffset = 0;
+    _maxDatarateOffset = 5;
+
+    _numChans125k = 16;
+    _numChans500k = 0;
+
+    GetSettings()->Session.Rx2Frequency = 921900000;
+    GetSettings()->Session.Rx2DatarateIndex = DR_0;
+
+    logInfo("Initialize datarates...");
+
+    dr.SpreadingFactor = SF_12;
+
+    // Add DR0-5
+    while (dr.SpreadingFactor >= SF_7) {
+        AddDatarate(-1, dr);
+        dr.SpreadingFactor--;
+        dr.Index++;
+    }
+
+    // Skip DR6-15 RFU
+    dr.SpreadingFactor = SF_INVALID;
+    while (dr.Index++ < DR_15) {
+        AddDatarate(-1, dr);
+    }
+
+    GetSettings()->Session.TxDatarate = 0;
+
+    logInfo("Initialize channels...");
+
+    Channel chan;
+    chan.DrRange.Fields.Min = DR_0;
+    chan.DrRange.Fields.Max = DR_5;
+    chan.Index = 0;
+    chan.Frequency = 922100000;
+    SetNumberOfChannels(16);
+
+    uint8_t numDefaultChannels = 3;
+
+    for (uint8_t i = 0; i < numDefaultChannels; i++) {
+        AddChannel(i, chan);
+        chan.Index++;
+        chan.Frequency += 200000;
+    }
+
+    chan.DrRange.Value = 0;
+    chan.Frequency = 0;
+
+    for (uint8_t i = numDefaultChannels; i < 16; i++) {
+        AddChannel(i, chan);
+        chan.Index++;
+    }
+
+    // Add downlink channel defaults
+    chan.Index = 0;
+    _dlChannels.resize(16);
+    for (uint8_t i = 0; i < 16; i++) {
+        AddDownlinkChannel(i, chan);
+        chan.Index++;
+    }
+
+    SetChannelMask(0, 0x07);
+
+    band.Index = 0;
+    band.FrequencyMin = _minFrequency;
+    band.FrequencyMax = _maxFrequency;
+    band.PowerMax = 14;
+    band.TimeOffEnd = 0;
+
+    // Disable duty-cycle limits
+    band.DutyCycle = 0;
+
+    AddDutyBand(-1, band);
+
+    GetSettings()->Session.TxPower = GetSettings()->Network.TxPower;
+}
+
+uint8_t ChannelPlan_KR920::AddChannel(int8_t index, Channel channel) {
+    logTrace("Add Channel %d : %lu : %02x %d", index, channel.Frequency, channel.DrRange.Value, _channels.size());
+
+    assert(index < (int) _channels.size());
+
+    if (index >= 0) {
+        _channels[index] = channel;
+    } else {
+        _channels.push_back(channel);
+    }
+
+    return LORA_OK;
+}
+
+uint8_t ChannelPlan_KR920::HandleJoinAccept(const uint8_t* buffer, uint8_t size) {
+
+    if (size == 33) {
+        Channel ch;
+        int index = 3;
+        for (int i = 13; i < size - 5; i += 3) {
+
+            ch.Frequency = ((buffer[i]) | (buffer[i + 1] << 8) | (buffer[i + 2] << 16)) * 100u;
+
+            if (ch.Frequency > 0) {
+                ch.Index = index;
+                ch.DrRange.Fields.Min = static_cast<int8_t>(DR_0);
+                ch.DrRange.Fields.Max = static_cast<int8_t>(DR_5);
+                AddChannel(index, ch);
+
+                if (GetDutyBand(ch.Frequency) > -1)
+                    _channelMask[0] |= (1 << index);
+                else
+                    _channelMask[0] |= ~(1 << index);
+
+                index += 1;
+            }
+        }
+    }
+
+    return LORA_OK;
+}
+
+uint8_t ChannelPlan_KR920::SetTxConfig() {
+
+    logInfo("Configure radio for TX");
+
+    uint8_t band = GetDutyBand(GetChannel(_txChannel).Frequency);
+    Datarate txDr = GetDatarate(GetSettings()->Session.TxDatarate);
+    int8_t max_pwr = _dutyBands[band].PowerMax;
+
+    if (GetChannel(_txChannel).Frequency < 922100000) {
+        max_pwr = 10;
+    } else {
+        max_pwr = 14;
+    }
+
+    int8_t pwr = 0;
+
+    pwr = std::min < int8_t > (GetSettings()->Session.TxPower, (max_pwr - GetSettings()->Network.AntennaGain));
+
+    for (int i = 20; i >= 0; i--) {
+        if (RADIO_POWERS[i] <= pwr) {
+            pwr = i;
+            break;
+        }
+        if (i == 0) {
+            pwr = i;
+        }
+    }
+
+    logDebug("Session pwr: %d ant: %d max: %d", GetSettings()->Session.TxPower, GetSettings()->Network.AntennaGain, max_pwr);
+    logDebug("Radio Power index: %d output: %d total: %d", pwr, RADIO_POWERS[pwr], RADIO_POWERS[pwr] + GetSettings()->Network.AntennaGain);
+
+    uint32_t bw = txDr.Bandwidth;
+    uint32_t sf = txDr.SpreadingFactor;
+    uint8_t cr = txDr.Coderate;
+    uint8_t pl = txDr.PreambleLength;
+    uint16_t fdev = 0;
+    bool crc = txDr.Crc;
+    bool iq = txDr.TxIQ;
+
+    if (GetSettings()->Network.DisableCRC == true)
+        crc = false;
+
+    SxRadio::RadioModems_t modem = SxRadio::MODEM_LORA;
+
+    if (sf == SF_FSK) {
+        modem = SxRadio::MODEM_FSK;
+        sf = 50e3;
+        fdev = 25e3;
+        bw = 0;
+    }
+
+    GetRadio()->SetTxConfig(modem, pwr, fdev, bw, sf, cr, pl, false, crc, false, 0, iq, 3e3);
+
+    logDebug("TX PWR: %u DR: %u SF: %u BW: %u CR: %u PL: %u CRC: %d IQ: %d", pwr, txDr.Index, sf, bw, cr, pl, crc, iq);
+
+    return LORA_OK;
+}
+
+
+uint8_t ChannelPlan_KR920::SetRxConfig(uint8_t window, bool continuous) {
+
+    RxWindow rxw = GetRxWindow(window);
+    GetRadio()->SetChannel(rxw.Frequency);
+
+    Datarate rxDr = GetDatarate(rxw.DatarateIndex);
+    uint32_t bw = rxDr.Bandwidth;
+    uint32_t sf = rxDr.SpreadingFactor;
+    uint8_t cr = rxDr.Coderate;
+    uint8_t pl = rxDr.PreambleLength;
+    uint16_t sto = rxDr.SymbolTimeout();
+    uint32_t afc = 0;
+    bool crc = false; // downlink does not use CRC according to LORAWAN
+
+    if (GetSettings()->Network.DisableCRC == true)
+        crc = false;
+
+    Datarate txDr = GetDatarate(GetSettings()->Session.TxDatarate);
+    bool iq = txDr.RxIQ;
+
+    if (P2PEnabled()) {
+        iq = txDr.TxIQ;
+    }
+
+    SxRadio::RadioModems_t modem = SxRadio::MODEM_LORA;
+
+    if (sf == SF_FSK) {
+        modem = SxRadio::MODEM_FSK;
+        sf = 50e3;
+        cr = 0;
+        bw = 50e3;
+        afc = 83333;
+        iq = false;
+        crc = true;  // FSK must use CRC
+    }
+
+    // Disable printf's to actually receive packets, printing to debug may mess up the timing
+    // logTrace("Configure radio for RX%d on freq: %lu", window, rxw.Frequency);
+    // logTrace("RX SF: %u BW: %u CR: %u PL: %u STO: %u CRC: %d IQ: %d", sf, bw, cr, pl, sto, crc, iq);
+
+    GetRadio()->SetRxConfig(modem, bw, sf, cr, afc, pl, sto, false, 0, crc, false, 0, iq, continuous);
+
+    return LORA_OK;
+}
+
+Channel ChannelPlan_KR920::GetChannel(int8_t index) {
+    Channel chan;
+    memset(&chan, 0, sizeof(Channel));
+
+    chan = _channels[index];
+
+    return chan;
+}
+
+uint8_t ChannelPlan_KR920::SetFrequencySubBand(uint8_t sub_band) {
+    return LORA_OK;
+}
+
+void ChannelPlan_KR920::LogRxWindow(uint8_t wnd) {
+
+    RxWindow rxw = GetRxWindow(wnd);
+    Datarate rxDr = GetDatarate(rxw.DatarateIndex);
+    uint8_t bw = rxDr.Bandwidth;
+    uint8_t sf = rxDr.SpreadingFactor;
+    uint8_t cr = rxDr.Coderate;
+    uint8_t pl = rxDr.PreambleLength;
+    uint16_t sto = rxDr.SymbolTimeout();
+    bool crc = false; // downlink does not use CRC according to LORAWAN
+    bool iq = GetTxDatarate().RxIQ;
+
+    logTrace("RX%d on freq: %lu", wnd, rxw.Frequency);
+    logTrace("RX DR: %u SF: %u BW: %u CR: %u PL: %u STO: %u CRC: %d IQ: %d", rxDr.Index, sf, bw, cr, pl, sto, crc, iq);
+}
+
+RxWindow ChannelPlan_KR920::GetRxWindow(uint8_t window) {
+    RxWindow rxw;
+    int index = 0;
+
+    if (P2PEnabled()) {
+        rxw.Frequency = GetSettings()->Network.TxFrequency;
+        index = GetSettings()->Session.TxDatarate;
+    } else {
+        if (window == 1) {
+            // Use same frequency as TX
+            rxw.Frequency = _channels[_txChannel].Frequency;
+
+            if (GetSettings()->Session.TxDatarate > GetSettings()->Session.Rx1DatarateOffset) {
+                index = GetSettings()->Session.TxDatarate - GetSettings()->Session.Rx1DatarateOffset;
+            } else {
+                index = 0;
+            }
+
+        } else {
+            // Use session RX2 frequency
+            rxw.Frequency = GetSettings()->Session.Rx2Frequency;
+            index = GetSettings()->Session.Rx2DatarateIndex;
+        }
+    }
+
+    rxw.DatarateIndex = index;
+
+    return rxw;
+}
+
+uint8_t ChannelPlan_KR920::HandleRxParamSetup(const uint8_t* payload, uint8_t index, uint8_t size, uint8_t& status) {
+    status = 0x07;
+    int8_t datarate = 0;
+    int8_t drOffset = 0;
+    uint32_t freq = 0;
+
+    drOffset = payload[index++];
+    datarate = drOffset & 0x0F;
+    drOffset = (drOffset >> 4) & 0x07;
+
+    freq = payload[index++];
+    freq |= payload[index++] << 8;
+    freq |= payload[index++] << 16;
+    freq *= 100;
+
+    if (!CheckRfFrequency(freq)) {
+        logInfo("Freq KO");
+        status &= 0xFE; // Channel frequency KO
+    }
+
+    if (datarate < _minRx2Datarate || datarate > _maxRx2Datarate) {
+        logInfo("DR KO");
+        status &= 0xFD; // Datarate KO
+    }
+
+    if (drOffset < 0 || drOffset > _maxDatarateOffset) {
+        logInfo("DR Offset KO");
+        status &= 0xFB; // Rx1DrOffset range KO
+    }
+
+    if ((status & 0x07) == 0x07) {
+        logInfo("RxParamSetup accepted Rx2DR: %d Rx2Freq: %d Rx1Offset: %d", datarate, freq, drOffset);
+        SetRx2DatarateIndex(datarate);
+        SetRx2Frequency(freq);
+        SetRx1Offset(drOffset);
+    } else {
+        logInfo("RxParamSetup rejected Rx2DR: %d Rx2Freq: %d Rx1Offset: %d", datarate, freq, drOffset);
+    }
+
+    return LORA_OK;
+}
+
+uint8_t ChannelPlan_KR920::HandleNewChannel(const uint8_t* payload, uint8_t index, uint8_t size, uint8_t& status) {
+
+    status = 0x03;
+    uint8_t channelIndex = 0;
+    Channel chParam;
+
+    channelIndex = payload[index++];
+    lora::CopyFreqtoInt(payload + index, chParam.Frequency);
+    index += 3;
+    chParam.DrRange.Value = payload[index++];
+
+    if (channelIndex < 3 || channelIndex > _channels.size() - 1) {
+        logError("New Channel index KO");
+        status &= 0xFE; // Channel index KO
+    }
+
+    if (!GetRadio()->CheckRfFrequency(chParam.Frequency)) {
+        logError("New Channel frequency KO");
+        status &= 0xFE; // Channel frequency KO
+    }
+
+    if (chParam.DrRange.Fields.Min > chParam.DrRange.Fields.Max) {
+        logError("New Channel datarate min/max KO");
+        status &= 0xFD; // Datarate range KO
+    } else if (chParam.DrRange.Fields.Min < _minDatarate || chParam.DrRange.Fields.Min > _maxDatarate) {
+        logError("New Channel datarate min KO");
+        status &= 0xFD; // Datarate range KO
+    } else if (chParam.DrRange.Fields.Max < _minDatarate || chParam.DrRange.Fields.Max > _maxDatarate) {
+        logError("New Channel datarate max KO");
+        status &= 0xFD; // Datarate range KO
+    }
+
+    if ((status & 0x03) == 0x03) {
+        logInfo("New Channel accepted index: %d freq: %lu drRange: %02x", channelIndex, chParam.Frequency, chParam.DrRange.Value);
+        AddChannel(channelIndex, chParam);
+        SetChannelMask(0, _channelMask[0] | 1 << (channelIndex));
+    }
+
+    return LORA_OK;
+}
+
+uint8_t ChannelPlan_KR920::HandlePingSlotChannelReq(const uint8_t* payload, uint8_t index, uint8_t size, uint8_t& status) {
+
+    lora::CopyFreqtoInt(payload + index, _beaconRxChannel.Frequency);
+    index += 3;
+
+    if (_beaconRxChannel.Frequency != 0) {
+        _beaconRxChannel.DrRange.Value = payload[index];
+    } else {
+        // TODO: set to default beacon rx channel
+    }
+
+    status = 0x03;
+    return LORA_OK;
+}
+
+uint8_t ChannelPlan_KR920::HandleBeaconFrequencyReq(const uint8_t* payload, uint8_t index, uint8_t size, uint8_t& status) {
+
+    status = 0x03;
+    Channel chParam;
+
+    // Skip channel index
+    index++;
+
+    lora::CopyFreqtoInt(payload + index, chParam.Frequency);
+    index += 3;
+    chParam.DrRange.Value = payload[index++];
+
+    if (!GetRadio()->CheckRfFrequency(chParam.Frequency)) {
+        status &= 0xFE; // Channel frequency KO
+    }
+
+    if (chParam.DrRange.Fields.Min < chParam.DrRange.Fields.Max) {
+        status &= 0xFD; // Datarate range KO
+    } else if (chParam.DrRange.Fields.Min < _minDatarate || chParam.DrRange.Fields.Min > _maxDatarate) {
+        status &= 0xFD; // Datarate range KO
+    } else if (chParam.DrRange.Fields.Max < _minDatarate || chParam.DrRange.Fields.Max > _maxDatarate) {
+        status &= 0xFD; // Datarate range KO
+    }
+
+    if ((status & 0x03) == 0x03) {
+        _beaconChannel = chParam;
+    }
+
+    if (_beaconChannel.Frequency == 0) {
+        // TODO: Set to default
+    }
+
+    status = 0x01;
+
+    return LORA_OK;
+}
+
+
+uint8_t ChannelPlan_KR920::HandleAdrCommand(const uint8_t* payload, uint8_t index, uint8_t size, uint8_t& status) {
+    uint8_t power = 0;
+    uint8_t datarate = 0;
+    uint16_t mask = 0;
+    uint16_t new_mask = 0;
+    uint8_t ctrl = 0;
+    uint8_t nbRep = 0;
+
+    status = 0x07;
+    datarate = payload[index++];
+    power = datarate & 0x0F;
+    datarate = (datarate >> 4) & 0x0F;
+
+    mask = payload[index++];
+    mask |= payload[index++] << 8;
+
+    nbRep = payload[index++];
+    ctrl = (nbRep >> 4) & 0x07;
+    nbRep &= 0x0F;
+
+    if (nbRep == 0) {
+        nbRep = 1;
+    }
+
+    if (datarate > _maxDatarate) {
+        status &= 0xFD; // Datarate KO
+    }
+    //
+    // Remark MaxTxPower = 0 and MinTxPower = 7
+    //
+    if (power < 0 || power > 7) {
+        status &= 0xFB; // TxPower KO
+    }
+
+    switch (ctrl) {
+        case 0:
+            SetChannelMask(0, mask);
+            break;
+
+        case 6:
+            // enable all currently defined channels
+            // set bits 0 - N of a number by (2<<N)-1
+            new_mask = (1 << _channels.size()) - 1;
+            SetChannelMask(0, new_mask);
+            break;
+
+        default:
+            logWarning("rejecting RFU or unknown control value %d", ctrl);
+            status &= 0xFE; // ChannelMask KO
+            return LORA_ERROR;
+    }
+
+    if (GetSettings()->Network.ADREnabled) {
+        GetSettings()->Session.TxDatarate = datarate;
+        GetSettings()->Session.TxPower = TX_POWERS[power];
+        GetSettings()->Session.Redundancy = nbRep;
+    } else {
+        logDebug("ADR is disabled, DR and Power not changed.");
+        status &= 0xFB; // TxPower KO
+        status &= 0xFD; // Datarate KO
+    }
+
+    logDebug("ADR DR: %u PWR: %u Ctrl: %02x Mask: %04x NbRep: %u Stat: %02x", datarate, power, ctrl, mask, nbRep, status);
+
+    return LORA_OK;
+}
+
+uint8_t ChannelPlan_KR920::ValidateAdrConfiguration() {
+    uint8_t status = 0x07;
+    uint8_t datarate = GetSettings()->Session.TxDatarate;
+    uint8_t power = GetSettings()->Session.TxPower;
+
+    if (!GetSettings()->Network.ADREnabled) {
+        logDebug("ADR disabled - no applied changes to validate");
+        return status;
+    }
+
+    if (datarate > _maxDatarate) {
+        logWarning("ADR Datarate KO - outside allowed range");
+        status &= 0xFD; // Datarate KO
+    }
+    if (power < _minTxPower || power > _maxTxPower) {
+        logWarning("ADR TX Power KO - outside allowed range");
+        status &= 0xFB; // TxPower KO
+    }
+
+    // default channels must be enabled
+    if ((_channelMask[0] & 0x0007) != 0x0007) {
+        logWarning("ADR Channel Mask KO - default channels must be enabled");
+        status &= 0xFE; // ChannelMask KO
+    }
+
+    // mask must not contain any undefined channels
+    for (int i = 3; i < 16; i++) {
+        if ((_channelMask[0] & (1 << i)) && (_channels[i].Frequency == 0)) {
+            logWarning("ADR Channel Mask KO - cannot enable undefined channel");
+            status &= 0xFE; // ChannelMask KO
+            break;
+        }
+    }
+
+    return status;
+}
+
+uint8_t ChannelPlan_KR920::HandleAckTimeout() {
+
+    if (!GetSettings()->Network.ADREnabled) {
+        return LORA_ADR_OFF;
+    }
+
+    if ((++(GetSettings()->Session.AckCounter) % 2) == 0) {
+        if (GetSettings()->Session.TxPower < GetSettings()->Network.TxPowerMax) {
+            logTrace("ADR Setting power to maximum");
+            GetSettings()->Session.TxPower = GetSettings()->Network.TxPowerMax;
+        } else if (GetSettings()->Session.TxDatarate > 0) {
+            logTrace("ADR Lowering datarate");
+            (GetSettings()->Session.TxDatarate)--;
+        }
+    }
+
+    return LORA_OK;
+}
+
+
+uint32_t ChannelPlan_KR920::GetTimeOffAir()
+{
+    if (GetSettings()->Test.DisableDutyCycle == lora::ON)
+        return 0;
+
+    uint32_t min = 0;
+    uint32_t now = _dutyCycleTimer.read_ms();
+
+
+    min = UINT_MAX;
+    int8_t band = 0;
+
+    if (P2PEnabled()) {
+        int8_t band = GetDutyBand(GetSettings()->Network.TxFrequency);
+        if (_dutyBands[band].TimeOffEnd > now) {
+            min = _dutyBands[band].TimeOffEnd - now;
+        } else {
+            min = 0;
+        }
+    } else {
+        for (size_t i = 0; i < _channels.size(); i++) {
+            if (IsChannelEnabled(i) && GetChannel(i).Frequency != 0 &&
+                !(GetSettings()->Session.TxDatarate < GetChannel(i).DrRange.Fields.Min ||
+                  GetSettings()->Session.TxDatarate > GetChannel(i).DrRange.Fields.Max)) {
+
+                band = GetDutyBand(GetChannel(i).Frequency);
+                if (band != -1) {
+                    // logDebug("band: %d time-off: %d now: %d", band, _dutyBands[band].TimeOffEnd, now);
+                    if (_dutyBands[band].TimeOffEnd > now) {
+                        min = std::min < uint32_t > (min, _dutyBands[band].TimeOffEnd - now);
+                    } else {
+                        min = 0;
+                        break;
+                    }
+                }
+            }
+        }
+    }
+
+
+    if (GetSettings()->Session.AggregatedTimeOffEnd > 0 && GetSettings()->Session.AggregatedTimeOffEnd > now) {
+        min = std::max < uint32_t > (min, GetSettings()->Session.AggregatedTimeOffEnd - now);
+    }
+
+    now = time(NULL);
+    uint32_t join_time = 0;
+
+    if (GetSettings()->Session.JoinFirstAttempt != 0 && now < GetSettings()->Session.JoinTimeOffEnd) {
+        join_time = (GetSettings()->Session.JoinTimeOffEnd - now) * 1000;
+    }
+
+    min = std::max < uint32_t > (join_time, min);
+
+    return min;
+}
+
+
+void ChannelPlan_KR920::UpdateDutyCycle(uint32_t freq, uint32_t time_on_air_ms) {
+    if (GetSettings()->Test.DisableDutyCycle == lora::ON) {
+        _dutyCycleTimer.stop();
+        for (size_t i = 0; i < _dutyBands.size(); i++) {
+            _dutyBands[i].TimeOffEnd = 0;
+        }
+        return;
+    }
+
+    _dutyCycleTimer.start();
+
+    if (GetSettings()->Session.MaxDutyCycle > 0 && GetSettings()->Session.MaxDutyCycle <= 15) {
+        GetSettings()->Session.AggregatedTimeOffEnd = _dutyCycleTimer.read_ms() + time_on_air_ms * GetSettings()->Session.AggregateDutyCycle;
+        logDebug("Updated Aggregate DCycle Time-off: %lu DC: %f%%", GetSettings()->Session.AggregatedTimeOffEnd, 1 / float(GetSettings()->Session.AggregateDutyCycle));
+    } else {
+        GetSettings()->Session.AggregatedTimeOffEnd = 0;
+    }
+
+
+    uint32_t time_off_air = 0;
+    uint32_t now = _dutyCycleTimer.read_ms();
+
+    for (size_t i = 0; i < _dutyBands.size(); i++) {
+        if (_dutyBands[i].TimeOffEnd < now) {
+            _dutyBands[i].TimeOffEnd = 0;
+        } else {
+            _dutyBands[i].TimeOffEnd -= now;
+        }
+
+        if (freq >= _dutyBands[i].FrequencyMin && freq <= _dutyBands[i].FrequencyMax) {
+            logDebug("update TOE: freq: %d i:%d toa: %d DC:%d", freq, i, time_on_air_ms, _dutyBands[i].DutyCycle);
+
+            if (freq > _minFrequency && freq < _maxFrequency && (GetSettings()->Session.TxPower + GetSettings()->Network.AntennaGain) <= 7) {
+                _dutyBands[i].TimeOffEnd = 0;
+            } else {
+                time_off_air = time_on_air_ms * _dutyBands[i].DutyCycle;
+                _dutyBands[i].TimeOffEnd = time_off_air;
+            }
+        }
+    }
+
+
+    ResetDutyCycleTimer();
+}
+
+std::vector<uint32_t> lora::ChannelPlan_KR920::GetChannels() {
+    std::vector < uint32_t > chans;
+
+    for (int8_t i = 0; i < (int) _channels.size(); i++) {
+        chans.push_back(_channels[i].Frequency);
+    }
+    chans.push_back(GetRxWindow(2).Frequency);
+
+    return chans;
+}
+
+std::vector<uint8_t> lora::ChannelPlan_KR920::GetChannelRanges() {
+    std::vector < uint8_t > ranges;
+
+    for (int8_t i = 0; i < (int) _channels.size(); i++) {
+        ranges.push_back(_channels[i].DrRange.Value);
+    }
+
+    ranges.push_back(GetRxWindow(2).DatarateIndex);
+
+    return ranges;
+
+}
+
+void lora::ChannelPlan_KR920::EnableDefaultChannels() {
+    _channelMask[0] |= 0x0003;
+}
+
+uint8_t ChannelPlan_KR920::GetNextChannel()
+{
+    if (GetSettings()->Session.AggregatedTimeOffEnd != 0) {
+        return LORA_AGGREGATED_DUTY_CYCLE;
+    }
+
+    if (P2PEnabled() || GetSettings()->Network.TxFrequency != 0) {
+        logDebug("Using frequency %d", GetSettings()->Network.TxFrequency);
+
+        if (GetSettings()->Test.DisableDutyCycle != lora::ON) {
+            int8_t band = GetDutyBand(GetSettings()->Network.TxFrequency);
+            logDebug("band: %d freq: %d", band, GetSettings()->Network.TxFrequency);
+            if (band != -1 && _dutyBands[band].TimeOffEnd != 0) {
+                return LORA_NO_CHANS_ENABLED;
+            }
+        }
+
+        GetRadio()->SetChannel(GetSettings()->Network.TxFrequency);
+        return LORA_OK;
+    }
+
+    uint8_t start = 0;
+    uint8_t maxChannels = _numChans125k;
+    uint8_t nbEnabledChannels = 0;
+    uint8_t *enabledChannels = new uint8_t[maxChannels];
+
+    if (GetTxDatarate().Bandwidth == BW_500) {
+        maxChannels = _numChans500k;
+        start = _numChans125k;
+    }
+
+// Search how many channels are enabled
+    DatarateRange range;
+    uint8_t dr_index = GetSettings()->Session.TxDatarate;
+    uint32_t now = _dutyCycleTimer.read_ms();
+
+    for (size_t i = 0; i < _dutyBands.size(); i++) {
+        if (_dutyBands[i].TimeOffEnd < now || GetSettings()->Test.DisableDutyCycle == lora::ON) {
+            _dutyBands[i].TimeOffEnd = 0;
+        }
+    }
+
+    for (uint8_t i = start; i < start + maxChannels; i++) {
+        range = GetChannel(i).DrRange;
+        // logDebug("chan: %d freq: %d range:%02x", i, GetChannel(i).Frequency, range.Value);
+
+        if (IsChannelEnabled(i) && (dr_index >= range.Fields.Min && dr_index <= range.Fields.Max)) {
+            int8_t band = GetDutyBand(GetChannel(i).Frequency);
+            // logDebug("band: %d freq: %d", band, _channels[i].Frequency);
+            if (band != -1 && _dutyBands[band].TimeOffEnd == 0) {
+                enabledChannels[nbEnabledChannels++] = i;
+            }
+        }
+    }
+
+    logTrace("Number of available channels: %d", nbEnabledChannels);
+
+    uint32_t freq = 0;
+    uint8_t sf = GetTxDatarate().SpreadingFactor;
+    uint8_t bw = GetTxDatarate().Bandwidth;
+    int16_t thres = DEFAULT_FREE_CHAN_RSSI_THRESHOLD;
+
+    if (nbEnabledChannels == 0) {
+        delete [] enabledChannels;
+        return LORA_NO_CHANS_ENABLED;
+    }
+
+    if (GetSettings()->Network.CADEnabled) {
+        // Search for free channel with ms timeout
+        int16_t timeout = 10000;
+        Timer tmr;
+        tmr.start();
+
+        for (uint8_t j = rand_r(0, nbEnabledChannels - 1); tmr.read_ms() < timeout; j++) {
+            freq = GetChannel(enabledChannels[j]).Frequency;
+
+            if (GetRadio()->IsChannelFree(SxRadio::MODEM_LORA, freq, sf, thres, bw)) {
+                _txChannel = enabledChannels[j];
+                break;
+            }
+        }
+    } else {
+        uint8_t j = rand_r(0, nbEnabledChannels - 1);
+        _txChannel = enabledChannels[j];
+        freq = GetChannel(_txChannel).Frequency;
+    }
+
+    assert(freq != 0);
+
+    logDebug("Using channel %d : %d", _txChannel, freq);
+    GetRadio()->SetChannel(freq);
+
+    delete [] enabledChannels;
+    return LORA_OK;
+}
+
+
+uint8_t lora::ChannelPlan_KR920::GetJoinDatarate() {
+    uint8_t dr = GetSettings()->Session.TxDatarate;
+    static uint8_t cnt = 0;
+
+    if (GetSettings()->Test.DisableRandomJoinDatarate == lora::OFF) {
+        if ((cnt++ % 20) == 0) {
+            dr = lora::DR_0;
+        } else if ((cnt % 16) == 0) {
+            dr = lora::DR_1;
+        } else if ((cnt % 12) == 0) {
+            dr = lora::DR_2;
+        } else if ((cnt % 8) == 0) {
+            dr = lora::DR_3;
+        } else if ((cnt % 4) == 0) {
+            dr = lora::DR_4;
+        } else {
+            dr = lora::DR_5;
+        }
+    }
+
+    return dr;
+}
+
+uint8_t ChannelPlan_KR920::CalculateJoinBackoff(uint8_t size) {
+
+    time_t now = time(NULL);
+    uint32_t time_on_max = 0;
+    static uint32_t time_off_max = 15;
+    uint32_t rand_time_off = 0;
+
+    // TODO: calc time-off-max based on RTC time from JoinFirstAttempt, time-off-max is lost over sleep
+
+    if ((time_t)GetSettings()->Session.JoinTimeOffEnd > now) {
+        return LORA_JOIN_BACKOFF;
+    }
+
+    uint32_t secs_since_first_attempt = (now - GetSettings()->Session.JoinFirstAttempt);
+    uint16_t hours_since_first_attempt = secs_since_first_attempt / (60 * 60);
+
+    static uint8_t join_cnt = 0;
+
+    join_cnt = (join_cnt+1) % 8;
+
+    if (GetSettings()->Session.JoinFirstAttempt == 0) {
+        /* 1 % duty-cycle for first hour
+         * 0.1 % next 10 hours
+         * 0.01 % upto 24 hours         */
+        GetSettings()->Session.JoinFirstAttempt = now;
+        GetSettings()->Session.JoinTimeOnAir += GetTimeOnAir(size);
+        GetSettings()->Session.JoinTimeOffEnd = now + (GetTimeOnAir(size) / 10);
+    } else if (join_cnt == 0) {
+        if (hours_since_first_attempt < 1) {
+            time_on_max = 36000;
+            rand_time_off = rand_r(time_off_max - 1, time_off_max + 1);
+            // time off max 1 hour
+            time_off_max = std::min < uint32_t > (time_off_max * 2, 60 * 60);
+
+            if (GetSettings()->Session.JoinTimeOnAir < time_on_max) {
+                GetSettings()->Session.JoinTimeOnAir += GetTimeOnAir(size);
+                GetSettings()->Session.JoinTimeOffEnd = now + rand_time_off;
+            } else {
+                logWarning("Max time-on-air limit met for current join backoff period");
+                GetSettings()->Session.JoinTimeOffEnd = GetSettings()->Session.JoinFirstAttempt + 60 * 60;
+            }
+        } else if (hours_since_first_attempt < 11) {
+            if (GetSettings()->Session.JoinTimeOnAir < 36000) {
+                GetSettings()->Session.JoinTimeOnAir = 36000;
+            }
+            time_on_max = 72000;
+            rand_time_off = rand_r(time_off_max - 1, time_off_max + 1);
+            // time off max 1 hour
+            time_off_max = std::min < uint32_t > (time_off_max * 2, 60 * 60);
+
+            if (GetSettings()->Session.JoinTimeOnAir < time_on_max) {
+                GetSettings()->Session.JoinTimeOnAir += GetTimeOnAir(size);
+                GetSettings()->Session.JoinTimeOffEnd = now + rand_time_off;
+            } else {
+                logWarning("Max time-on-air limit met for current join backoff period");
+                GetSettings()->Session.JoinTimeOffEnd = GetSettings()->Session.JoinFirstAttempt + 11 * 60 * 60;
+            }
+        } else {
+            if (GetSettings()->Session.JoinTimeOnAir < 72000) {
+                GetSettings()->Session.JoinTimeOnAir = 72000;
+            }
+            uint32_t join_time = 2500;
+
+            time_on_max = 80700;
+            time_off_max = 1 * 60 * 60; // 1 hour
+            rand_time_off = rand_r(time_off_max - 1, time_off_max + 1);
+
+            if (GetSettings()->Session.JoinTimeOnAir < time_on_max - join_time) {
+                GetSettings()->Session.JoinTimeOnAir += GetTimeOnAir(size);
+                GetSettings()->Session.JoinTimeOffEnd = now + rand_time_off;
+            } else {
+                logWarning("Max time-on-air limit met for current join backoff period");
+                // Reset the join time on air and set end of restriction to the next 24 hour period
+                GetSettings()->Session.JoinTimeOnAir = 72000;
+                uint16_t days = (now - GetSettings()->Session.JoinFirstAttempt) / (24 * 60 * 60) + 1;
+                logWarning("days : %d", days);
+                GetSettings()->Session.JoinTimeOffEnd = GetSettings()->Session.JoinFirstAttempt + ((days * 24) + 11) * 60 * 60;
+            }
+        }
+
+        logWarning("JoinBackoff: %lu seconds  Time On Air: %lu / %lu", GetSettings()->Session.JoinTimeOffEnd - now, GetSettings()->Session.JoinTimeOnAir, time_on_max);
+    } else {
+        GetSettings()->Session.JoinTimeOnAir += GetTimeOnAir(size);
+        GetSettings()->Session.JoinTimeOffEnd = now + (GetTimeOnAir(size) / 10);
+    }
+
+    return LORA_OK;
+}
+
+uint8_t ChannelPlan_KR920::HandleMacCommand(uint8_t* payload, uint8_t& index) {
+    return LORA_ERROR;
+}
+
+void ChannelPlan_KR920::DefaultLBT() {
+    _LBT_TimeUs = 5000;
+    _LBT_Threshold = -65;
+}
+