String resultsearch;
String str;
String msg;
void setup() {
  Serial.begin(9600);
}

boolean isNumber(String str) {
  for (int i = 0; i < str.length(); i++) {
    if (!isdigit(str.charAt(i))) {
      return false;
    }
  }
  return true;
}

void loop() {
  while (Serial.available() > 0) {
    msg = Serial.readString();
    msg.trim();
    Serial.print("Available: ");
    Serial.println(msg);
    Serial.println(" ");

    resultsearch = msg;
    resultsearch.replace("test", "");
    str = msg;
    str.remove(4);
    //Serial.println(str);

    if (str == "test" & isNumber(resultsearch) & resultsearch != "")  {
      Serial.print("result: ");
      Serial.println(resultsearch);
      Serial.println(" ");
      ESP.restart();
    }
  }
}