// MIT License
// https://github.com/gonzalocasas/arduino-uno-dragino-lorawan/blob/master/LICENSE
// Based on examples from https://github.com/matthijskooijman/arduino-lmic
// Copyright (c) 2015 Thomas Telkamp and Matthijs Kooijman

// Adaptions: Andreas Spiess

#include <lmic.h>
#include <hal/hal.h>
//#include <credentials.h>
#include <math.h>
#include <stdlib.h>

#ifdef CREDENTIALS
static const u1_t NWKSKEY[16] = NWKSKEY1;
static const u1_t APPSKEY[16] = APPSKEY1;
static const u4_t DEVADDR = DEVADDR1;
#else
static const u1_t NWKSKEY[16] = { key };
static const u1_t APPSKEY[16] = { key };
static const u4_t DEVADDR = 0xthingymcjigger;
#endif

// 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 osjob_t sendjob;

// Schedule TX every this many seconds (might become longer due to duty
// cycle limitations).
const unsigned TX_INTERVAL = 20;

// Pin mapping Dragino Shield
const lmic_pinmap lmic_pins = {
    .nss = 10,
    .rxtx = LMIC_UNUSED_PIN,
    .rst = 9,
    .dio = {2, 6, 7},
};

int sensorPin = A5; // select the input pin for the potentiometer

void onEvent (ev_t ev) {
    if (ev == EV_TXCOMPLETE) {
        Serial.println(F("EV_TXCOMPLETE (includes waiting for RX windows)"));
        // Schedule next transmission
        os_setTimedCallback(&sendjob, os_getTime()+sec2osticks(TX_INTERVAL), do_send);
    }
}


double read_thermistor(int RawADC) {
  double Temp;
  Temp = log(10000.0*((1024.0/RawADC-1)));
  Temp = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * Temp * Temp ))* Temp );
  Temp = Temp - 273.15;            // Convert Kelvin to Celcius
   //Temp = (Temp * 9.0)/ 5.0 + 32.0; // Convert Celcius to Fahrenheit
   return Temp;
}

void convert_to_string(char * outStr, int length, double val){
    Serial.println(F("Converting..."));
    dtostrf(val,2,0,outStr);
    Serial.println(outStr);
}


void do_send(osjob_t* j){
    // Payload to send (uplink)
    uint8_t message[8];
    int A = analogRead(sensorPin);
    double temp = read_thermistor(A);
    convert_to_string(message,8,A);

    // 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, message,2, 0);

//        LMIC_setTxData2(1, message, sizeof(message)-1, 0);
        Serial.println(F("Sending uplink packet..."));
//        Serial.println(temp);
    }
    // Next TX is scheduled after TX_COMPLETE event.
}

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

    // LMIC init
    os_init();

    // Reset the MAC state. Session and pending data transfers will be discarded.
    LMIC_reset();

    // Set static session parameters.
    LMIC_setSession (0x1, DEVADDR, NWKSKEY, APPSKEY);

    // 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_SF12,14);

    // Start job
    do_send(&sendjob);
}

void loop() {
    os_runloop_once();
}