protocol.h

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#pragma once
 
#include <stdint.h>
 
const uint8_t MASTER_PSK[32] = {
  0xA1, 0x3C, 0x7F, 0x04, 0xE8, 0x92, 0x5B, 0xD6,
  0x3A, 0xFF, 0x01, 0x88, 0x4D, 0x62, 0xC0, 0x19,
  0x77, 0x2E, 0xB3, 0x55, 0x0C, 0xAD, 0xF1, 0x39,
  0x6B, 0x84, 0xE0, 0x27, 0x93, 0x5A, 0x1D, 0xCC
};
 
 
const uint8_t FLAG_SYN = 0x01; 
const uint8_t FLAG_DAT = 0x02; 
const uint8_t FLAG_FIN = 0x04; 
 
const uint8_t HELLO_NONCE_SIZE   = 12u; 
const uint8_t AUTH_TAG_SIZE      = 16u; 
const uint8_t TRUNCATED_MAC_SIZE =  8u; 
 
const uint8_t DATA_PAYLOAD_SIZE  = 4u;
 
const uint8_t SYNC_BYTE_1 = 0xAA; 
const uint8_t SYNC_BYTE_2 = 0x55; 
 
#pragma pack(push, 1)
struct HelloPacket {
  uint8_t flags;                   
  uint8_t nonce[HELLO_NONCE_SIZE]; 
};
#pragma pack(pop)
 
#pragma pack(push, 1)
struct DataPacket {
  uint8_t  flags;                   
  uint16_t seq_num;                 
  uint16_t payload[2];              
  uint8_t  mac[TRUNCATED_MAC_SIZE]; 
};
#pragma pack(pop)
 
const uint8_t ACK_BYTE  = 0x06; 
const uint8_t NACK_BYTE = 0x15; 
 
const uint8_t REST_INDEX = 255;
 
 
const uint32_t ACK_TIMEOUT_MS = 50UL; 
const uint8_t  MAX_RETRIES    = 50u;  
 
const uint16_t BAUD_RATE = 9600;