ESP8266 Community Forum

- Mon Jul 17, 2017 3:36 pm #68293 Greetings,

At first, when I begined with the esp8266, I handled connections with this method :

Code: Select all
  WiFiClient client = server.available();
  if (client)
  {

    //Serial.println("\n[Client connected]");
    while (client.connected())
    {
      if (client.available())
      {
        String line = client.readStringUntil('\r');
        Serial.print(line);

        line.toCharArray(string, 100);
        //ANSWERS






//OPTION 1

        if (has_been_answered == false) {

          if (line.indexOf("/config") != -1)  {
            client.println(CONFIG_WEB_PAGE());
            has_been_answered = true;
            break;
          }
        }





//OPTION 2 (this was the option given to a new connection without arguments :     /config)


        if (has_been_answered == false) {
          if (line.length() == 1 && line[0] == '\n' || line.indexOf("/inicio") != -1)
          {
            client.println(WEB_PAGE());

            has_been_answered = true;
            break;
          }

        }



        //ANSWERS END
      }
     
    }
    client.stop();
     Serial.println();
      Serial.println();
      Serial.println();
    //Serial.printf("[Client disonnected]\n");
  }
}


Where WEB_PAGE, and CONFIG_WEB_PAGE where two different webpages, with their http headers, but recently i discovered that you could also answer clients by using the handle.client method:

Code: Select all//DIVIDED INTO 2 PARTS
void setup() {        //WHERE YOU SET THE ANSWERS
  server.on("/",main_webpage);


//THIS 3  ARE FOR ANSWERING JAVASCRIPTS
  server.on("/arg1", function1);
  server.on("/arg2", function2);
  server.on("/arg3", function3);



  server.onNotFound(notfoundfunction);


  const char * headerkeys[] = {"User-Agent", "Cookie"} ;
  size_t headerkeyssize = sizeof(headerkeys) / sizeof(char*);
  //ask server to track these headers
  server.collectHeaders(headerkeys, headerkeyssize );
  server.begin();

}


//ANSWERING FUNCTIONS



void main_webpage() {
  //server.sendHeader("Refresh", "1");
  server.send(WEB_PAGE().length(), "text/html", WEB_PAGE());

}




void function1() {
  server.send(String(var1).length(), "text/plain", String(var1));
}
void function2() {
  server.sendHeader("Cache-Control", "no-cache, no-store, must-revalidate"); server.sendHeader("Pragma", "no-cache"); server.sendHeader("Expires", "-1");
  server.send(String(var2).length(), "text/plain", String(var2));
}
void function3() {
  server.sendHeader("Cache-Control", "no-cache, no-store, must-revalidate"); server.sendHeader("Pragma", "no-cache"); server.sendHeader("Expires", "-1");
  server.send(String(var3).length(), "text/plain", String(var3));

}






void notfoundfunction() {
  String message = "ERROR 404\n\n";
  //message += "URI: ";
  //message += server.uri();
  //message += "\nMethod: ";
  //message += (server.method() == HTTP_GET) ? "GET" : "POST";
  //message += "\nArguments: ";
  //message += server.args();
  // message += "\n";
  //for (uint8_t i = 0; i < server.args(); i++) {
  //  message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
  // }
  server.send(message.length(), "text/plain", message);
}




In this last method of answering the client, which I think is more correct than the first one, I am able to answers javascripts and forms, and do more things, but now I am trying to make this last method answer multiple clients simultaneously, something that the 1st method could.

So the final questions are:

1st; How can I answer multiple clients simultaneously with the 2nd method?
(The most similar thing I found on the internet said something about arrays, but I didnt understood it, and I think it uses the first method linkhttps://arduino.stackexchange.com/questions/31256/multiple-client-server-over-wifi)


2nd;Which method is more correct?



3rd:How do you handle connections?