Study LoraWAN

lora_play.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Ref: 
// https://www.eebreakdown.com/2017/01/lora-ii.html
// https://lora-alliance.org/sites/default/files/2018-07/lorawan1.0.3.pdf
typedef struct _Personalized {
  // DevEUI: 64 bit -> Static
  unsigned char DevEUI[8];
  // AppEUI: 64 bit -> Static
  unsigned char AppEUI[8];
  // AppKey: 128 bit -> Static
  unsigned char AppKey[16];
} Personalized;

typedef struct _Activated {

  // DevAddr: 32 bit -> Dynamic
  struct {
    unsigned int NwkID:7;
    unsigned int NwkAddr:25;
  } DevAddr;

  // NwkSKey: 128 bit -> Dynamic
  unsigned char NwkSKey[16];
  // AppSKey: 128 bit -> Dynamic
  unsigned char AppSKey[16];
} Activated;

int JoinRequest(Personalized pers) {

  unsigned char buf[18] = {0};
  memcpy(buf, pers.AppEUI, 8);
  memcpy(buf+4, pers.DevEUI, 4);

}

int main(void) {

  Personalized p;
  Activated a;

  p.AppEUI[0] = 0x12;
  p.AppEUI[1] = 0x34;
  p.AppEUI[2] = 0x56;
  p.AppEUI[3] = 0x78;
  p.AppEUI[4] = 0x11;
  p.AppEUI[5] = 0x22;
  p.AppEUI[6] = 0x33;
  p.AppEUI[7] = 0x44;
  p.DevEUI[0] = 0x77;
  p.DevEUI[1] = 0x55;
  p.DevEUI[2] = 0x33;
  p.DevEUI[3] = 0x11;
  p.DevEUI[4] = 0x78;
  p.DevEUI[5] = 0x56;
  p.DevEUI[6] = 0x34;
  p.DevEUI[7] = 0x12;
  JoinRequest(p);

  printf("Hello world\n");
  return 0;
}