#include <TinyGPS++.h>
    #include <SoftwareSerial.h>
    #include <lmic.h>
    #include <hal/hal.h>

    uint8_t coords[9];

    static const int RXPin = 0, TXPin = 1; // TXPin not used / dummy
    static const uint32_t GPSBaud = 9600;
    // The TinyGPS++ object
    TinyGPSPlus gps;
    // The serial connection to the GPS device

    SoftwareSerial ss(RXPin, TXPin);
    uint32_t timer = millis();

    // LoraWAN Copyright (c) 2015 Thomas Telkamp and Matthijs Kooijman
    // https://github.com/matthijskooijman/arduino-lmic
    // -------- LoRa PinMapping FeatherWing Octopus
    const lmic_pinmap lmic_pins = {  
      .nss = 2,                            // Connected to pin D
      .rxtx = LMIC_UNUSED_PIN,             // For placeholder only, Do not connected on RFM92/RFM95
      .rst = LMIC_UNUSED_PIN,              // Needed on RFM92/RFM95? (probably not) D0/GPIO16 
      .dio = {
        15, 15, LMIC_UNUSED_PIN         }
    };


    // mapper3 ABP

    void os_getArtEui (u1_t* buf) { 
    }
    void os_getDevEui (u1_t* buf) { 
    }
    void os_getDevKey (u1_t* buf) { 
    }


    //mapper-bb-006 please insert the keys in MSB Format 
    // DEVADDR example: 260A1B2C

    static const u4_t DEVADDR = 0x260XXXXX;
    static const u1_t PROGMEM APPSKEY[16]={ XXX };
    static const u1_t PROGMEM NWKSKEY[16]={ XXX };


    volatile int LoRaWAN_Tx_Ready      = 0; // Merker für ACK 

    int LoRaWAN_Rx_Payload = 0 ;
    // -------- LoRa Event 
    void onEvent (ev_t ev) { 
      Serial.print(os_getTime());
      Serial.print(": ");
      switch(ev) {
      case EV_SCAN_TIMEOUT:
        Serial.println(F("EV_SCAN_TIMEOUT"));
        break;
      case EV_BEACON_FOUND:
        Serial.println(F("EV_BEACON_FOUND"));
        break;
      case EV_BEACON_MISSED:
        Serial.println(F("EV_BEACON_MISSED"));
        break;
      case EV_BEACON_TRACKED:
        Serial.println(F("EV_BEACON_TRACKED"));
        break;
      case EV_JOINING:
        Serial.println(F("EV_JOINING"));
        break;
      case EV_JOINED:
        Serial.println(F("EV_JOINED"));
        // Disable link check validation (automatically enabled
        // during join, but not supported by TTN at this time).
        LMIC_setLinkCheckMode(0);
        break;
      case EV_RFU1:
        Serial.println(F("EV_RFU1"));
        break;
      case EV_JOIN_FAILED:
        Serial.println(F("EV_JOIN_FAILED"));
        break;
      case EV_REJOIN_FAILED:
        Serial.println(F("EV_REJOIN_FAILED"));
        break;
        break;
      case EV_TXCOMPLETE:
        Serial.println(F("EV_TXCOMPLETE (includes waiting for RX windows)"));
        if (LMIC.txrxFlags & TXRX_ACK)
          Serial.println(F("Received ack"));
        if (LMIC.dataLen) {
          Serial.println(F("Received "));
          Serial.println(LMIC.dataLen);
          Serial.println(F(" bytes of payload"));
          LoRaWAN_Rx_Payload = 0; 
          for (int i = 0;i<LMIC.dataLen;i++) { 
            Serial.println(LMIC.frame[i+ LMIC.dataBeg],HEX);
            LoRaWAN_Rx_Payload = 256*LoRaWAN_Rx_Payload+LMIC.frame[i+ LMIC.dataBeg];
          }
        }
        LoRaWAN_Tx_Ready = 1;
        // Schedule next transmission
        //os_setTimedCallback(&sendjob, os_getTime()+sec2osticks(TX_INTERVAL), do_send);
        break;
      case EV_LOST_TSYNC:
        Serial.println(F("EV_LOST_TSYNC"));
        break;
      case EV_RESET:
        Serial.println(F("EV_RESET"));
        break;
      case EV_RXCOMPLETE:
        // data received in ping slot
        Serial.println(F("EV_RXCOMPLETE"));
        break;
      case EV_LINK_DEAD:
        Serial.println(F("EV_LINK_DEAD"));
        break;
      case EV_LINK_ALIVE:
        Serial.println(F("EV_LINK_ALIVE"));
        break;
      default:
        Serial.println(F("Unknown event"));
        break;
      }
    }

    void setup(){ // Einmalige Initialisierung
      Serial.begin(115200);
      ss.begin(GPSBaud);

      // -- Initialisiere LoraWAN 
      os_init();             // LMIC LoraWAN
      LMIC_reset();          // Reset the MAC state 
      LMIC.txpow = 27;       // Maximum TX power 
      LMIC.datarate=DR_SF12; // Long Range
      LMIC.rps = updr2rps(LMIC.datarate);

      // Set static session parameters. Instead of dynamically establishing a session
      // by joining the network, precomputed session parameters are be provided.
      uint8_t appskey[sizeof(APPSKEY)];
      uint8_t nwkskey[sizeof(NWKSKEY)];
      memcpy_P(appskey, APPSKEY, sizeof(APPSKEY));
      memcpy_P(nwkskey, NWKSKEY, sizeof(NWKSKEY));
      LMIC_setSession (0x1, DEVADDR, nwkskey, appskey);
      // Set up the channels used by the Things Network, which corresponds 
      // to the defaults of most gateways. Without this, only three base
      // channels from the LoRaWAN specification are used
      LMIC_setupChannel(0, 868100000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);      // g-band
      LMIC_setupChannel(1, 868300000, DR_RANGE_MAP(DR_SF12, DR_SF7B), BAND_CENTI);      // g-band
      LMIC_setupChannel(2, 868500000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);      // g-band
      LMIC_setupChannel(3, 867100000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);      // g-band
      LMIC_setupChannel(4, 867300000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);      // g-band
      LMIC_setupChannel(5, 867500000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);      // g-band
      LMIC_setupChannel(6, 867700000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);      // g-band
      LMIC_setupChannel(7, 867900000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);      // g-band
      LMIC_setupChannel(8, 868800000, DR_RANGE_MAP(DR_FSK,  DR_FSK),  BAND_MILLI);      // g2-band
      LMIC_setLinkCheckMode(0);   // Disable link check validation
      LMIC.dn2Dr = DR_SF9;         // TTN uses SF9 for its RX2 window.
      LMIC_setDrTxpow(DR_SF7,14); // Set data rate and transmit power for uplink


    }

    void loop() { // Kontinuierliche Wiederholung 
      
      while (ss.available() > 0)
      
      if (gps.encode(ss.read()))
      {
     
      /*
      // if millis() or timer wraps around, we'll just reset it
      if (timer > millis()) timer = millis();
         
      // approximately every 10 seconds or so, print out the current stats
      if (millis() - timer > 30000) {
        timer = millis(); // reset the timer
    */

        if (gps.location.isValid()) {

        Serial.print(gps.altitude.meters(), 6);
        Serial.print(F(","));
        Serial.print(gps.location.lat(), 6);
        Serial.print(F(","));
        Serial.print(gps.location.lng(), 6);
        Serial.print(F(","));
        Serial.println(gps.location.isValid(), 6);
            
        
        //Block------------------------------ sende Daten an TTN  
        //int port = 10;
        //static uint8_t mydata[2];
        //int wert=round(boschBME280.readTempC()*10);
        //wert=round(boschBME680.readGas()/1000.*10);
        //mydata[0] = wert >> 8; 
        //mydata[1] = wert & 0xFF;
        // Check if there is not a current TX/RX job running
        //if (LMIC.opmode & OP_TXRXPEND) {
        
        if (LMIC.opmode & (1 << 7)) { 
          Serial.println(F("OP_TXRXPEND, not sending"));
        } 
        else {
          // Prepare upstream data transmission at the next possible time.
          LoRaWAN_Tx_Ready = 0;                                 // Merker für ACK
          //LMIC_setTxData2(port, mydata, sizeof(mydata), 0);     // Sende   

          int32_t lati = gps.location.lat() * 10000;
          int32_t lon = gps.location.lng() * 10000;
          int32_t altitudeGPS = gps.altitude.meters(); // int16_t
          int8_t hdopGPS = gps.hdop.value(); 

          Serial.println(lati);
          Serial.println(lon);
          Serial.println(altitudeGPS);
          Serial.println(hdopGPS);

          // Pad 2 int32_t to 6 8uint_t, big endian (24 bit each, having 11 meter precision)
          coords[0] = lati;
          coords[1] = lati >> 8;
          coords[2] = lati >> 16;

          coords[3] = lon;
          coords[4] = lon >> 8;
          coords[5] = lon >> 16;

          coords[6] = altitudeGPS;
          coords[7] = altitudeGPS >> 8;

          coords[8] = hdopGPS;
       
          LMIC_setTxData2(1, (uint8_t*) coords, sizeof(coords), 0);
       
          Serial.println(F("Packet queued"));
          while(LoRaWAN_Tx_Ready==0) {
            yield();
            os_runloop_once();
          };  // Warte bis gesendet
        //}
        // Blockende
          Serial.print(F("Waiting "));

          for (int i = 0;i<10;i++) { 
            Serial.print(F("."));
            delay(1000); // please set a proper duty cycle
          }
          Serial.println(" done.");

         }
        } else {
          Serial.println("no GPS fix");
        }
     }
    }