#include <string.h>

int i;
char tx[]="hello";
int length = strlen(tx);
String rx="",c;
String a = "readstring",b=" rx:";


void setup() {
  Serial.begin(9600);
  //Serial.println(tx);
 // Serial.println(length);
 

}

void loop(){
  delay(1000);
  /*
  Serial.write(tx[i]);
  rx +=(char)Serial.read();
  
  //Serial.print(tx[i]);
  if (tx[i]=='\0'&& i==length){i=0;Serial.println(rx);  rx="";
  }
  //Serial.flush();
    i++;
    */
    Serial.print(a);
    if (c==""){
    rx = Serial.readString(); 
    c=rx;
    Serial.println(c);}else {c="";}
    c="";
}