Can not recieve a string from bluetooth module due to bad code

[lunabgray]

hey, I am complelty confuzzled, I am trying to recieve a bluetooth string from my iphone with hm10 module, connected to oled screen and nano arduino. I have the following code:

#include <SoftwareSerial.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
// The pins for I2C are defined by the Wire-library. 
// On an arduino UNO:       A4(SDA), A5(SCL)
// On an arduino MEGA 2560: 20(SDA), 21(SCL)
// On an arduino LEONARDO:   2(SDA),  3(SCL), ...
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

SoftwareSerial mySerial(2,3);
String readString = "";
char c;
void setup()
{
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
mySerial.begin(9600);
Serial.begin(9600);
  display.clearDisplay();
  display.setTextSize(2);             // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE);        // Draw white text
  display.setCursor(0,10);             // Start at top-left corner
  display.println(F("Power on"));
  display.display();
}
void loop()
{ 
  while (Serial.available() > 0) {
    Serial.println("serial on");
    delay(10);  //small delay to allow input buffer to fill
    c = Serial.read();  //gets one byte from serial buffer
    readString += c; 
  } //makes the string readString  
  
  if (readString.length() > 0) {
      display.clearDisplay();
      display.setTextColor(WHITE);
      display.setTextSize(2);
      display.setCursor(0, 10);
      // Display static text
      display.println(readString);
      display.display();
    readString=""; //clears variable for new input
  }
}

it is supposed to make the bluetooth characters into a string then display it on the oled screen, the display is not the problem only the gathering of the characters into a string which does not work, I do not know what is wrong with the code + the wiring is good(bluetooth to d2 and d3)

whats wrong with my code? why is it not recieiving the string properly??

[cattledog]

whats wrong with my code? why is it not recieiving the string properly??

It's not clear how this is all wired together, but I think you want to read the output from the HM10 on software serial.

SoftwareSerial mySerial(2,3);

while (Serial.available() > 0) {
    Serial.println("serial on");
    delay(10);  //small delay to allow input buffer to fill
    c = Serial.read();  //gets one byte from serial buffer
    readString += c; 
  } //makes the string readString  

[Nick_Pyner]

You serial commands look like those used for "classic" Bluetooth. This might not work, and using it with IOS might further reduce your chances. You might need a BLE serial library, of which I believe there are several.