Dev - C++ - Unable to send "Hello, World" message repeatedly

#include <lmic.h>

#include <hal/hal.h>

#include <SPI.h>

#define CFG_eu868 1

#define CFG_sx1276_radio 1

const int relayPin =  2;

unsigned int relayState = LOW;

long offTime = 11000;

long onTime = 1000;

unsigned long previousMillis=0;

// 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] = { 0x3D, 0xD5, 0x44, 0x2D, 0xD7, 0xD6, 0x67, 0x2F, 0x6E, 0x71, 0x38, 0x79, 0x55, 0xC1, 0x62, 0xF5 };

// 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] = { 0xF3, 0x5E, 0xB6, 0x1D, 0x4F, 0x81, 0x8D, 0xC4, 0xD8, 0xFF, 0x9F, 0xE2, 0xA8, 0xB0, 0x39, 0x4D };

// LoRaWAN end-device address (DevAddr)

static const u4_t DEVADDR = 0x26011BA5 ; // <-- 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!";

static osjob_t sendjob;

// Schedule TX every this many seconds (might become longer due to duty

// cycle limitations).

const unsigned TX_INTERVAL = 10;

// Pin mapping

const lmic_pinmap lmic_pins = {

    .nss = 5,

    .rxtx = LMIC_UNUSED_PIN,

    .rst = 3,

    .dio = {2, 6, LMIC_UNUSED_PIN},

};

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);

    pinMode(relayPin, OUTPUT);

    relayState = LOW;

    digitalWrite(relayPin, LOW);

    #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

    #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() {

    // put your main code here, to run repeatedly:

    os_runloop_once();

}

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"));