struct RFSENSOR {
  uint8_t code[4];
  char name[18];
};
struct RFSENSOR RFsensor[4];

char line[36];
char FFile[66] = {"0xc1,0x8d,0x81,0,Zaplava koupelna\n"};
uint8_t LineNo = 0;

//------------------------------------------------------------------------------

// Check for extra characters in field or find minus sign.
char* skipSpace(char* str) {
  while (isspace(*str)) str++;
  return str;
}
//------------------------------------------------------------------------------
bool parseLine(char* str) {
  char* ptr;
  Serial.print("Line No: ");
  Serial.println(LineNo);
  // Set strtok start of line.
  str = strtok(str, ",");

  // strtoul accepts a leading minus with unexpected results.
  if (*skipSpace(str) == '-') return false;
  // Convert string to unsigned int 8b.
  RFsensor[LineNo].code[0] = strtoul(str, &ptr, 0);
  if (str == ptr || *skipSpace(ptr)) return false;
  Serial.println(RFsensor[LineNo].code[0]);

  str = strtok(nullptr, ",");
  if (!str) return false;
  RFsensor[LineNo].code[1] = strtoul(str, &ptr, 0);
  if (str == ptr || *skipSpace(ptr)) return false;
  Serial.println(RFsensor[LineNo].code[1]);

  // Subsequent calls to strtok expects a null pointer.
  str = strtok(nullptr, ",");
  if (!str) return false;

  // strtoul accepts a leading minus with unexpected results.
  if (*skipSpace(str) == '-') return false;
  // Convert string to unsigned int 8b.
  RFsensor[LineNo].code[2] = strtoul(str, &ptr, 0);
  if (str == ptr || *skipSpace(ptr)) return false;
  Serial.println(RFsensor[LineNo].code[2]);

  str = strtok(nullptr, ",");
  if (!str) return false;

  // strtoul accepts a leading minus with unexpected results.
  if (*skipSpace(str) == '-') return false;
  // Convert string to unsigned int 8b.
  RFsensor[LineNo].code[3] = strtoul(str, &ptr, 0);
  if (str == ptr || *skipSpace(ptr)) return false;
  Serial.println(RFsensor[LineNo].code[3]);

  str = strtok(nullptr, "\n");

	if (!str) return false;
  strlcpy(RFsensor[LineNo].name, str, 19);
  Serial.println(str);
  
  // Check for extra fields.
  return strtok(nullptr, ",") == nullptr;
}

//------------------------------------------------------------------------------
void setup() {
  Serial.begin(115200);

  // Wait for USB Serial
  while (!Serial) {
    yield();
  }
  if (!parseLine(FFile)) {
      Serial.print("parseLine failed");
    }
    Serial.println();
    LineNo++;
  
  for (byte i = 0; i < LineNo; i++) {
    Serial.print(RFsensor[i].code[0]);
    Serial.print(" ");
    Serial.print(RFsensor[i].code[1]);
    Serial.print(" ");
    Serial.print(RFsensor[i].code[2]);
    Serial.print(" ");
    Serial.print(RFsensor[i].code[3]);
    Serial.print(" >");
    Serial.print(RFsensor[i].name);
    Serial.println("<");
  }

  Serial.println(F("\nDone"));
}

void loop() {}