// download SafeString V4.1.5+ library from the Arduino Library manager or from
// https://www.forward.com.au/pfod/ArduinoProgramming/SafeString/index.html
#include "SafeString.h"
void setup() {
  Serial.begin(115200); //for debug
  for (int i = 10; i > 0; i--) {
    delay(500);
    Serial.print(i); Serial.print(' ');
  }
  Serial.println("ESP32 started");
  SafeString::setOutput(Serial); // enable error msgs

  char c[7];
  double d = 17.22;

  cSFA(sfC, c); // wrap the char[] in a SafeString for processin
  sfC = d; // default 2 dec.
  Serial.print(F("d=")); Serial.println(c);

  // OR for more control use SafeString.print( )
  sfC = ""; //clear it
  sfC.print(d, 1); // one dec
  Serial.print(F("d=")); Serial.println(c);

  sfC = "";
  sfC.print(d, 5, 7); // 5decs padded to width 7, width too large for char[ ]
  Serial.print(F("d=")); Serial.println(c);

  sfC = "";
  sfC.print(d, 5, 5); // 5decs padded to width 5,  dec reduced to fit in requested width
  Serial.print(F("d=")); Serial.println(c);
}

void loop() {
  if (SafeString::errorDetected()) {
    Serial.print(F("Error in a SafeString operation"));
  }
}