GpsLoRaWANTracker using Arduino, RN2483 and L86/neo-m8n GPS module

tracker.ino

#include <TinyGPS++.h>
#include <SoftwareSerial.h>
#include <avr/sleep.h>
#include <avr/power.h>

// ----------------------------------------------
// DEFINES
// ----------------------------------------------
#define rxGpsPin        10
#define txGpsPin        11
#define ledPin          6
#define loraResetPin    4
#define loraTxPin       8
#define loraRxPin       7
#define wakePin         2

#define sleepTime       60000 // 1 minute
#define minSatelites    8

const String devaddr = "XXXXXXXX";
const String appskey = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
const String nwkskey = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";

// ----------------------------------------------
// DEBUG TOOLS
// ----------------------------------------------
#define DEBUG
#ifdef DEBUG
void trace(String str) {
  Serial.println(str);
}
#else
#define trace(x) 
#endif

// ----------------------------------------------
// GLOBALS
// ----------------------------------------------
String str;
SoftwareSerial gpsSerial = SoftwareSerial(rxGpsPin, txGpsPin);
SoftwareSerial loraSerial = SoftwareSerial(loraRxPin, loraTxPin);
TinyGPSPlus gps;

// ----------------------------------------------
// SLEEP FUNCTIONS
// ----------------------------------------------
void wakeUpArduino(void)
{
  /* This will bring us back from sleep. */

  /* We detach the interrupt to stop it from
  * continuously firing while the interrupt pin
  * is low.
  */
  detachInterrupt(0);
}

void sleepArduino(void)
{

  /* Setup pin2 as an interrupt and attach handler. */
  attachInterrupt(0, wakeUpArduino, CHANGE);
  delay(100);

  set_sleep_mode(SLEEP_MODE_PWR_DOWN);

  sleep_enable();

  sleep_mode();

  /* The program will continue from here. */

  /* First thing to do is disable sleep. */
  sleep_disable();
}

// ----------------------------------------------
// SETUP
// ----------------------------------------------
void setup() {
  // put your setup code here, to run once:
#ifdef DEBUG
  Serial.begin(9600);
  while (!Serial);
#endif

  loraSerial.begin(57600);
  while (!loraSerial);

  //pinMode(rxGpsPin, INPUT);
  //pinMode(txGpsPin, OUTPUT);
  gpsSerial.begin(9600);

  pinMode(wakePin, INPUT);

  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, HIGH);

  // reset the module
  pinMode(loraResetPin, OUTPUT);
  digitalWrite(loraResetPin, LOW);
  delay(500);
  digitalWrite(loraResetPin, HIGH);
  delay(2000);

  loraSerial.setTimeout(50000);
  loraSerial.listen();
  trace("reset");
  //str = loraSerial.readStringUntil('\n');
  //trace(str);

  trace("init");
  loraSerial.println("mac set devaddr " + devaddr);
  str = loraSerial.readStringUntil('\n');
  trace(str);
  loraSerial.println("mac set appskey " + appskey);
  str = loraSerial.readStringUntil('\n');
  trace(str);
  loraSerial.println("mac set nwkskey " + nwkskey);
  str = loraSerial.readStringUntil('\n');
  trace(str);
  //loraSerial.println("mac set dr 5");
  //str = loraSerial.readStringUntil('\n');
  //trace(str);
  loraSerial.println("mac save");
  delay(2000);
  str = loraSerial.readStringUntil('\n');
  trace(str);
  loraSerial.println("mac join abp");
  delay(2000);
  str = loraSerial.readStringUntil('\n');
  trace(str);
  str = loraSerial.readStringUntil('\n');
  trace(str);
  digitalWrite(ledPin, LOW);

  gpsSerial.listen();
  trace("GPS listening...");

}

double lat;
double lng;
char latBuffer[20];
char lngBuffer[20];
char payload[100];
 
// ----------------------------------------------
// MAIN LOOP
// ----------------------------------------------
void loop() {

  while (gpsSerial.available())
  {
    if (gps.encode(gpsSerial.read()))
    {
      int satellites = gps.satellites.value();
      //Serial.print(satellites);
      if (gps.satellites.isValid() && (satellites >= minSatelites) && ((gps.location.isValid() && gps.location.age() < 2000)) && (gps.location.lat() > 0) && (gps.location.lng() > 0)) {
        digitalWrite(ledPin, HIGH);     
        lat = gps.location.lat();
        lng = gps.location.lng();
        dtostrf(lat, 10, 8, latBuffer);
        dtostrf(lng, 10, 8, lngBuffer);
        
        sprintf(payload, "%s,%s,%d", latBuffer, lngBuffer, satellites);
        gpsSerial.end();
        loraSerial.listen();
        sendRadioMsgBuffer(payload);
        str = loraSerial.readStringUntil('\n');
        trace(str);
        if (str.startsWith("ok"))
        {
          str = loraSerial.readStringUntil('\n');
          trace(str);
          if (str.startsWith("not_joi")) {
            loraSerial.println("mac join abp");
            delay(3000);
            str = loraSerial.readStringUntil('\n');
            str = loraSerial.readStringUntil('\n');
            trace(str);
            if (str.startsWith("acc")) {
              sendRadioMsgBuffer(payload);
              str = loraSerial.readStringUntil('\n');
              trace(str);
            }
          } else if (!str.startsWith("mac_tx_ok") && !str.startsWith("mac_rx")) {
            errorLoop();
          }
        }
        else
        {
          errorLoop();
        }

        digitalWrite(ledPin, LOW);
        
        loraSerial.print("sys sleep ");
        loraSerial.println(sleepTime);
        delay(100);
        trace("Sleeping...");
        sleepArduino(); // put arduino into sleep - it will be woken up by lora module

        gpsSerial.begin(9600);
        gpsSerial.listen();
      }
    }
  }
}

// ----------------------------------------------
// RADIO FUNCTIONS
// ----------------------------------------------
void sendRadioMsgBuffer(char* msg)
{
  size_t len = strlen(msg);
  loraSerial.print("mac tx cnf 1 ");
  for (int i = 0; i < len; i++) {
    loraSerial.print(msg[i], HEX);
  }
  loraSerial.println();
  Serial.println("Message was sent");
}

void sendRadioMsg(String msg)
{
  char charBuf[200];
  msg.toCharArray(charBuf, 200);
  sendRadioMsgBuffer(charBuf);
}

void errorLoop()
{
  while (true)
  {
    digitalWrite(ledPin, HIGH);
    delay(1000);
    digitalWrite(ledPin, LOW);
    delay(1000);
  }
}

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