{
  "SX127x_conf":
  {
    "freq": 923200000,
    "spread_factor": 7,
    "pin_nss": 10,
    "pin_dio0": 24,
    "pin_rst": 0,
    "pin_led1":5
  },
  "gateway_conf":
  {
    "ref_latitude": 0.0,
    "ref_longitude": 0.0,
    "ref_altitude": 10,

    "name": "SC Gateway",
    "email": "[email protected]",
    "desc": "Single Channel Gateway on RPI",

    "servers":
    [
      {
        "address": "router.eu.staging.thethings.network",
        "port": 1700,
        "enabled": false
      },
      {
        "address": "router.eu.thethings.network",
        "port": 1700,
        "enabled": true
      }
    ]
  }
}

#include <lmic.h>
#include <hal/hal.h>
#include <SPI.h>

// LoRaWAN NwkSKey, network session key
// This is the default Semtech key, which is used by the early prototype TTN
// network.
static const PROGMEM u1_t NWKSKEY[16] = {}; // Insert Network Session Key of The Device
//Example static const PROGMEM u1_t NWKSKEY[16] = { 0x00, 0xD0, 0x90, 0xEF, 0x7F, 0x1A, 0x50, 0xF3, 0xA8, 0xFA, 0xED, 0x34, 0xD3, 0x46, 0xDC, 0xDF };

// LoRaWAN AppSKey, application session key
// This is the default Semtech key, which is used by the early prototype TTN
// network.
static const u1_t PROGMEM APPSKEY[16] = {}; // Insert App Session Key of The Device
//Example static const u1_t PROGMEM APPSKEY[16] = { 0x07, 0x32, 0x00, 0xCE, 0xEF, 0x0F, 0x9A, 0x3B, 0x5F, 0xED, 0x3B, 0x1F, 0xEB, 0x88, 0x64, 0x24 };

// LoRaWAN end-device address (DevAddr)
static const u4_t DEVADDR = 0x26011900 ; // <-- Change this address for every node!

// These callbacks are only used in over-the-air activation, so they are
// left empty here (we cannot leave them out completely unless
// DISABLE_JOIN is set in config.h, otherwise the linker will complain).
void os_getArtEui (u1_t* buf) { }
void os_getDevEui (u1_t* buf) { }
void os_getDevKey (u1_t* buf) { }

static uint8_t mydata[] = "Hello, world!scsc";
static osjob_t sendjob;

// Schedule TX every this many seconds (might become longer due to duty
// cycle limitations).
const unsigned TX_INTERVAL = 60;

// Pin mapping
const lmic_pinmap lmic_pins = {
  .nss = 10,
  .rxtx = LMIC_UNUSED_PIN,
  .rst = 6,
  .dio = {2, 4, 5},
};

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"));
      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;
    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 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.
    LMIC_setTxData2(1, mydata, sizeof(mydata) - 1, 0);
    Serial.println(F("Packet queued"));
  }
  // Next TX is scheduled after TX_COMPLETE event.
}

void setup() {
  Serial.begin(115200);
  Serial.println(F("Starting"));

#ifdef VCC_ENABLE
  // For Pinoccio Scout boards
  pinMode(VCC_ENABLE, OUTPUT);
  digitalWrite(VCC_ENABLE, HIGH);
  delay(1000);
#endif

  // 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

  LMIC_setupChannel(0, 923200000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);  // g-band
//  LMIC_setupChannel(1, 923400000, DR_RANGE_MAP(DR_SF12, DR_SF7B), BAND_CENTI);  // g-band
//  LMIC_setupChannel(2, 923600000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);  // g-band
//  LMIC_setupChannel(3, 923800000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);  // g-band
//  LMIC_setupChannel(4, 924000000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);  // g-band
//  LMIC_setupChannel(5, 924200000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);  // g-band
//  LMIC_setupChannel(6, 924400000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);  // g-band
//  LMIC_setupChannel(7, 924600000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);  // g-band
//  LMIC_setupChannel(8, 924800000, DR_RANGE_MAP(DR_FSK,  DR_FSK),  BAND_MILLI);     // g2-band

  // 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();
}