Wokwi - Online ESP32, STM32, Arduino Simulator

#include <SoftwareSerial.h>
#define DEBUG true

int connectionId = -1;

SoftwareSerial esp32(7, 6);
String espmode = "3";
String SSid = "BSJ"; // enter your SSID here
String password = "batool"; // password

void wifisetup(String mode, String ssid, String pass);
void st_server(String HI, String Data, String HIcolor);

void setup() {
  pinMode(12, OUTPUT);
  pinMode(10, OUTPUT);
  Serial.begin(9600);

  esp32.begin(9600);
  digitalWrite(10, LOW);
  delay(1000);

  wifisetup(espmode, SSid, password);
  delay(1000);
  digitalWrite(10, HIGH);
}

String heading = "Internet of Things";
String color = "blue";
String dataSend = "hello world";

void loop() {
  digitalWrite(10, LOW);
  delay(1000);
  st_server(heading, dataSend, color);
  delay(1000);
  digitalWrite(10, HIGH);
}

// 1 - send data
String sendData(String command, const unsigned long timeout, boolean debug) {
  String response = "";
  if(debug){
    Serial.println(command);
  }
  esp32.print(command);//send the read char
  unsigned long  time = millis();
  while ((time+timeout) > millis()) {
    while (esp32.available()) {
      char c = esp32.read();
      response += c;
    }
  }

  if (debug) {
    Serial.println(response);
  }
  return response;
}

// 2 - connectivity
void wifisetup(String mode, String ssid, String pass) {
  sendData("AT\r\n", 2000, DEBUG); // reset

  String mode0 = "AT+CWMODE=";
  mode0 += mode;
  mode0 += "\r\n";
  sendData(mode0, 2000, DEBUG);

  String ssidset = "AT+CWJAP=\"";
  ssidset += ssid;
  ssidset += "\",\"";
  ssidset += pass;
  ssidset += "\"";
  ssidset += "\r\n";

  sendData(ssidset, 10000, DEBUG);
  delay(900);
  
  sendData("AT+CIFSR\r\n", 4000, DEBUG);// get ip
  sendData("AT+CIPMUX=1\r\n", 2000, DEBUG);//configure for multiple connections
  sendData("AT+CIPSERVER=1,80\r\n", 2000, DEBUG);//turn on port 80
  sendData("AT+CIPSTO=1000\r\n", 1000, DEBUG);
  return;
}

// 3 - placeholder for server function
void st_server(String HI, String Data, String HIcolor) {
  if(!esp32.available()){
    return;
  }
    if(esp32.find("+IPD,")){
      delay(1000);
      int connectionId = (esp32.read())-48;

      String webpage = "<head></head><body bgcolor=\"";
      webpage += HIcolor;
      webpage += "\"><h1>";
      webpage += HI;
      webpage += "</h1>";

      String cipSend = "AT+CIPSEND=";
      cipSend += connectionId;
      cipSend += ",";
      cipSend += webpage.length();
      cipSend += "\r\n";
      sendData(cipSend, 2000, DEBUG);
      sendData(webpage, 2000, DEBUG);

      String Data1 = Data;
      cipSend = "AT+CIPSEND=";
      cipSend += connectionId;
      cipSend += ",";
      cipSend += Data1.length();

      cipSend += "\r\n";
      sendData(cipSend, 1000, DEBUG);
      sendData(Data1, 1000, DEBUG);
    }

    String closeCommand = "AT+CIPCLOSE=";
    closeCommand += connectionId;//append connection id
    closeCommand += "\r\n";
    sendData(closeCommand, 3000, DEBUG);
    return;
  
}