#include <lmic.h>

#include <hal/hal.h>

#include <SPI.h>

#include <TinyGPS++.h>

#include <AltSoftSerial.h>

#define LPP_GPS 136     


static const int RXPin = 8, TXPin = 9;

static const uint32_t GPSBaud = 9600;


TinyGPSPlus gps;

AltSoftSerial ss(RXPin, TXPin); // RX, TX

static const PROGMEM u1_t NWKSKEY[16] = { 0x0C, 0x7D, 0xD7, 0xA4, 0x2D, 0x31, 0x61, 0xA1, 0xD6, 0xDC, 0x4A, 0x86, 0xBC, 0xD8, 0xA9, 0xFE };

static const u1_t PROGMEM APPSKEY[16] = { 0x3F, 0x02, 0x68, 0xFF, 0x6D, 0xA7, 0x08, 0x77, 0xF9, 0x6D, 0xEE, 0xBC, 0x86, 0x3C, 0x70, 0xA5 }; 

static const u4_t DEVADDR = 0x26011848 ; // <-- Change this address for every node!

const unsigned TX_INTERVAL = 10;  

 

void os_getArtEui (u1_t* buf) { }

void os_getDevEui (u1_t* buf) { }

void os_getDevKey (u1_t* buf) { }


  uint8_t coords[11];

  static osjob_t sendjob;

  static osjob_t initjob;

  uint8_t cursor = 0;

  uint8_t channel;


// Pin mapping

  const lmic_pinmap lmic_pins = {

  .nss = 10,

  .rxtx = LMIC_UNUSED_PIN,

  .rst = LMIC_UNUSED_PIN,

  .dio = {4, 5, 7},

};


  void get_coords () {

  bool newData = false;

  unsigned long chars;

  unsigned short sentences, failed;

  float flat,flon,faltitudeGPS,fhdopGPS; 

  unsigned long age;


  // For one second we parse GPS data and report some key values

  for (unsigned long start = millis(); millis() - start < 1000;) {

    while (ss.available()) {

      char c = ss.read();

      Serial.write(c); // uncomment this line if you want to see the GPS data flowing

      if (gps.encode(c)) { // Did a new valid sentence come in?

        newData = true;

      }

    }

  }


 if ( newData ) {

    flat=gps.location.lat();

    flon=gps.location.lng();

    if (gps.altitude.isValid())

         faltitudeGPS = gps.altitude.meters();

     else

        faltitudeGPS=0;

    fhdopGPS = gps.hdop.value();    

}


  //gps.stats(&chars, &sentences, &failed);


  int32_t lat = flat * 10000;

  int32_t lon = flon * 10000;

  int16_t altitudeGPS = faltitudeGPS * 100;

  int8_t hdopGPS = fhdopGPS;

 

  channel = 0x01;

  coords[0] = channel; 

  coords[1] = LPP_GPS; 


  coords[2] = lat >> 16;

  coords[3] = lat >> 8;

  coords[4] = lat;

  

  coords[5] = lon >> 16; 

  coords[6] = lon >> 8;

  coords[7] = lon;


  coords[8] = altitudeGPS;

  coords[9] = altitudeGPS >> 8;

  coords[10] = hdopGPS;

 

}


void do_send(osjob_t* j) {

  // Check if there is not a current TX/RX job running

  if (LMIC.opmode & OP_TXRXPEND) {

    Serial.println(F("OP_TXRXPEND, not sending"));

  } else {

    // Prepare upstream data transmission at the next possible time.

    get_coords();

    LMIC_setTxData2(1, (uint8_t*) coords, sizeof(coords), 0);

    Serial.println(F("Packet queued"));

  } 

}


  // Next TX is scheduled after TX_COMPLETE 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"));

      }

      // 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()

{

  Serial.begin(115200);

  Serial.println(F("Starting"));

  ss.begin(GPSBaud);


  // LMIC init

  os_init();


  // Reset the MAC state. Session and pending data transfers will be discarded.

  LMIC_reset();


    // Set static session parameters. Instead of dynamically establishing a session

    // by joining the network, precomputed session parameters are be provided.

    #ifdef PROGMEM

    // On AVR, these values are stored in flash and only copied to RAM

    // once. Copy them to a temporary buffer here, LMIC_setSession will

    // copy them into a buffer of its own again.

    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);

    #else

    // If not running an AVR with PROGMEM, just use the arrays directly

    LMIC_setSession (0x1, DEVADDR, NWKSKEY, APPSKEY);

    #endif


    #if defined(CFG_eu868)

    // 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, which certainly

    // works, so it is good for debugging, but can overload those

    // frequencies, so be sure to configure the full frequency range of

    // your network here (unless your network autoconfigures them).

    // Setting up channels should happen after LMIC_setSession, as that

    // configures the minimal channel set.

    // NA-US channels 0-71 are configured automatically

    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

    // TTN defines an additional channel at 869.525Mhz using SF9 for class B

    // devices' ping slots. LMIC does not have an easy way to define set this

    // frequency and support for class B is spotty and untested, so this

    // frequency is not configured here.

    #elif defined(CFG_us915)

    // NA-US channels 0-71 are configured automatically

    // but only one group of 8 should (a subband) should be active

    // TTN recommends the second sub band, 1 in a zero based count.

    // https://github.com/TheThingsNetwork/gateway-conf/blob/master/US-global_conf.json

    LMIC_selectSubBand(1);

    #endif


    // Disable link check validation

    LMIC_setLinkCheckMode(0);


    // TTN uses SF9 for its RX2 window.

    LMIC.dn2Dr = DR_SF9;


    // Set data rate and transmit power for uplink (note: txpow seems to be ignored by the library)

    LMIC_setDrTxpow(DR_SF7,14);


    // Start job

    do_send(&sendjob);

}


void loop() {

  os_runloop_once();

}