acces_keys_example.h

// include file for The Things Network keys
static const u1_t PROGMEM DEVEUI[8]= { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }; // lsb
void os_getDevEui (u1_t* buf) { 
  memcpy_P(buf, DEVEUI, 8);
}

static const u1_t PROGMEM APPEUI[8]={ 0x00,0x00,0x00,0x00,0x00,0x00,0xB3,0x70 }; // lsb
void os_getArtEui (u1_t* buf) { 
  memcpy_P(buf, APPEUI, 8);
}

static const u1_t PROGMEM APPKEY[16]={ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }; // MSB !!
void os_getDevKey (u1_t* buf) {  
  memcpy_P(buf, APPKEY, 16);
};