/*
Struct Opções utilizando: define e struct com struct
Autor: Eng. Fabrício Ribeiro
19/05/2025
*/

//Mtype
#define Join_Request 0
#define Join_Accept 1
#define Unconfirmed_Data_Up 2
#define Unconfirmed_Data_Down 3
#define Confirmed_Data_Up 4
#define Confirmed_Data_Down 5
#define Rejoin_Request 6
#define Proprietary 7

//RFU
#define Teste0 0
#define Teste1 1
#define Teste2 2
#define Teste3 3
#define Teste4 4
#define Teste5 5
#define Teste6 6
#define Teste7 7

//Versão
#define Version_0 0
#define Version_1 1
#define Version_2 2
#define Version_3 3

//Mpayload
byte AppEUI[8] = {0xAB, 0xF7, 0x15, 0x88, 0x09, 0xCF, 0x4F, 0x3C};
byte DevEUI[8] = {0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE, 0xD2, 0xA6};
byte DevNonce[2] = {0xAB, 0xCD};

//MIC
byte MIC[4] = {0xAA, 0xBB, 0xCC, 0xDD};

//Protótipos
void print_array(uint8_t vetor[], uint8_t n);

//Struct MHDR
struct __attribute__ ((packed)) _MHDR{
  byte Mtype:3; //3bit
  byte RFU:3; //3bit
  byte Version:2; //2bit
};

//Struct Mpayload
struct __attribute__ ((packed)) _Mpayload{
  byte *AppEUI;
  byte *DevEUI;
  byte *DevNonce;
};

//Struct PHYPayload
typedef struct __attribute__ ((packed)) _PHYPayload{
  _MHDR MHDR;
  _Mpayload Mpayload;
  byte *MIC;
};

void setup(){

  Serial.begin(115200);

  _PHYPayload PHYPayload;

  //Mtype
  PHYPayload.MHDR.Mtype = Join_Accept;
  PHYPayload.MHDR.RFU = Teste1;
  PHYPayload.MHDR.Version = Version_1;

  //Mpayload
  PHYPayload.Mpayload.AppEUI = AppEUI;
  PHYPayload.Mpayload.DevEUI = DevEUI;
  PHYPayload.Mpayload.DevNonce = DevNonce;

  //MIC
  PHYPayload.MIC = MIC;

  //Impressões
  Serial.print("MHDR: ");
  print_binario(PHYPayload.MHDR.Mtype);
 
  Serial.print("AppEUI: ");
  print_array(PHYPayload.Mpayload.AppEUI, 8);

  Serial.print("DevEUI: ");
  print_array(PHYPayload.Mpayload.DevEUI, 8);

  Serial.print("DevNonce: ");
  print_array(PHYPayload.Mpayload.DevNonce, 2);

  Serial.print("MIC: ");
  print_array(PHYPayload.MIC, 4);  

}

void loop(){
  

}

//Imprime binario
void print_binario(byte n){

  for(int i=2; i>=0; i--){
    Serial.print(bitRead(n, i));
  }

  for(int i=2; i>=0; i--){
    Serial.print(bitRead(n, i));
  }

  for(int i=1; i>=0; i--){
    Serial.print(bitRead(n, i));
  } 

  Serial.println(" ");
}

//Imprime array
void print_array(uint8_t vetor[], uint8_t n){

  for(byte i=0; i<n; i++){
    Serial.print(vetor[i] < 16 ? "0" : "");
    Serial.print(vetor[i], HEX);
    Serial.print(" ");
  }  

  Serial.println(" ");
}