Arduino Multi-character serial reader with check for command input

serial.ino

const char endChar = '\n';
const char commandIdent = '$';

String inputString;
boolean hasInput = false;
boolean isCommand = false;

void setup() {
  Serial.begin(9600);
}


void loop() {
  if (hasInput) {
    if (isCommand) {
      Serial.println("Got command: " + inputString);
    } else {
      Serial.println("Got input: " + inputString);
    }
    inputString = "";
    isCommand = false;
    hasInput = false;
  }
}


void serialEvent() {
  while (Serial.available()) {
    char inChar = (char)Serial.read();

    if (inChar == endChar) { // It's the end of the input stream, let's work out what it is
      hasInput = true;

      if (inputString.startsWith(String(commandIdent))) {
        isCommand = true;
        inputString.remove(0, 1);
      }
    } else {
      inputString += inChar;
    }
  }
}