arduino-modem-sketch-01

// modem sketch

// User configuration [START]
int baudrate = 9600;  // 9600 -> DEFAULT
// User configuration [END]


void setup() {
  Serial.begin(baudrate);
  Serial.println(freeRam());
}


void loop() {

  if (Serial.available() > 0) {
    Serial.println(string_readln());
    Serial.println(freeRam());
  }
}

String string_readln() {
  delay(500); // Just a temporary change, as one needs to wait for the buffer to fill
  char *string_readln_line;
  unsigned long long i = 0;
  String string_readln_output;

  string_readln_line = (char *) (malloc(Serial.available()*sizeof(char)));

  while (Serial.available() > 0) {
    *&string_readln_line[i] = Serial.read();
    i++;
  }

  string_readln_output = String(string_readln_line);
  free(string_readln_line);
  return string_readln_output;

}
int freeRam () {
  extern int __heap_start, *__brkval;
  int v;
  return (int) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval);
}