STM32 + WiFi – HelloWorld

boolean No_IP=false;                                  
String IP="";                                         //String variable to store IP Address
     
void check4IP(int t1)                                     //A function to check ip of ESP8266
{
  int t2=millis();
  while(t2+t1>millis())
  {
    while(Serial2.available()>0)
    {
      if(Serial2.find("WIFI GOT IP"))
      {
        No_IP=true;
      }
    }
  }
}

void fx_println(String cmd)
{ //wysyła polecenie na oba złącza serial (konsola + WiFi) + znak LN
    Serial.println(cmd);                  //Sends to serial monitor
    Serial2.println(cmd);                 //sends to ESP8266 via serial communication  
}

void fx_print(String cmd)
{ //wysyła polecenie na oba złącza serial (konsola + WiFi)
    Serial.print(cmd);                  //Sends to serial monitor
    Serial2.print(cmd);                 //sends to ESP8266 via serial communication  
}


void get_ip()                                           //After cheacking ip ,this is a function to get IP address
{
  IP="";
  char ch=0;
  while(1)
  {
    fx_println("AT+CIFSR");                   //GET IP AT COMMAND
    while(Serial2.available()>0)        
    {
      if(Serial2.find("STAIP,"))                   //This finds the STAIP that is the STATIC IP ADDRESS of ESP8266
      {
        delay(1000);
        Serial.print("IP Address:");
        while(Serial2.available()>0)
        {
          ch=Serial2.read();                      //Serial2 reads from ESP8266
          if(ch=='+')
          break;
          IP+=ch;
        }
      }
      if(ch=='+')
      break;
    }
    if(ch=='+')
    break;
    delay(1000);
  }
  Serial.print(IP);                                //prints IP address in Serial monitor
  Serial.println("Port:80");
}

void connect_wifi(String cmd, int t)                  //This function is for connecting ESP8266 with wifi network by using AT commands
{
  uint8_t i=0;
  while(1)
  {
    fx_println(cmd); //wysłanie na oba UARTy
    while(Serial2.available())
    {
      if(Serial2.find("OK"))
      i=8;
    }
    delay(t);
    if(i>5)
      break;
    i++;
  }
  Serial.println(i==8 ? "OK" : "Error");
}

void wifi_init()                                //This function contains AT commands that passes to connect_wifi()
{
      connect_wifi("AT",100);                   //Sends AT command with time(Command for Achknowledgement)
      connect_wifi("AT+CWMODE=3",100);          //Sends AT command with time (For setting mode of Wifi)
      connect_wifi("AT+CWQAP",100);            //Sends AT command with time (for Quit AP)
      connect_wifi("AT+RST",5000);             //Sends AT command with time (For RESETTING WIFI)
      check4IP(5000);
      if(!No_IP)
      {    
        Serial.println("Łączę z siecią Wifi....");
        connect_wifi("AT+CWJAP=\"NetworkID\",\"NetworkPassword\"",7000);         //USER I HASŁO DO WIFI
        if(No_IP)  
            Serial.println("Połączone!");
      }
      get_ip();
     
      connect_wifi("AT+CIPMUX=1",100);                          //Sends AT command with time (For creating multiple connections) Wiele połączeń - obsługa
      connect_wifi("AT+CIPSERVER=1,80",100);                    //Sends AT command with time (For setting up server with port 80) Serwer www!
}



void sendwebdata(String webPage)                          //This function is used to send webpage datas to the localserver
{
    int ii=0;
     while(1)
     {
      unsigned int l=webPage.length();
      fx_print("AT+CIPSEND=0,");
      Serial.println(l+2);
      Serial2.println(l+2);
      delay(100);
      fx_println(webPage);
      while(Serial2.available())
      {      
        if(Serial2.find("OK"))
        {
          ii=11;
          break;
        }
      }
      if(ii==11)
      break;
      delay(100);
     }
}

void setup()
{
   delay(5000); //not neccessary, time to open console.
   Serial.begin(115200);                //begins serial monitor with baud rate 9600
   Serial2.begin(115200);               //begins serial communication with esp8266 with baud rate 9600 (Change according to your esp8266 module)
   wifi_init();
   Serial.println("System Ready..");
}

void loop()
{
  uint16_t k=0;
  Serial.print(".");
  while(k<1000)
  {
    k++;
   while(Serial2.available())
   {
    if(Serial2.find("0,CONNECT"))
    {
      Serial.println("Start Sending...");
      Send();
      Serial.println("..Done. Connection Closed.");
      delay(1000);
    }
  }
  delay(1);
 }
}

void Send()                                      
{
    //MINIMALNA STRONA WWW (nagłówki HTTP konieczne jeśli otwieramy przeglądarką)
      String webpage = "HTTP/1.1 200 OK\nContent-Length: 13\nContent-Type: text/plain; charset=utf-8\n\nHello World!\n";
      sendwebdata(webpage);
      fx_println("AT+CIPCLOSE=0");                  //Closes the server connection
}