String fromread = "";
byte letter = 0;

void setup() {

Serial.begin(9600);
Serial.write(10);
}

void loop() {

while(!Serial.available()) {}

if(Serial.available()) {
  fromread = Serial.readString();
}

for(int i = 0; i < fromread.length(); i = i + 1) {

  letter = fromread[i];

  if(letter == 'w') {
    Serial.println("Command!");
    if(fromread[i + 1] == '1'){
      Serial.println("CMD nr. one");
    }

if(fromread[i + 1] == '2'){
      Serial.println("CMD nr. two");
    }

if(fromread[i + 1] == '3'){
      Serial.println("CMD nr. three");
    }

  }

}

}