ESP32 Forum

Posted: **Wed Mar 06, 2019 5:49 pm**

Hi everyone,

I'm trying to turn on and off my pc remotely and trough wireless.
In order to do this, i used the code shown below.

Code: Select all

#include <WiFi.h>


const char* ssid     = "ssid";
const char* password = "passwifi";
unsigned long check_wifi = 30000;


WiFiServer server(49152);

const int led1 =  22;      // the number of the LED pin

// Client variables
char linebuf[80];
int charcount=0;
byte mac[6];

void setup() {
 
  // initialize the LEDs pins as an output:
  pinMode(led1, OUTPUT);
 
  //Initialize serial and wait for port to open:
  Serial.begin(115200);
  while(!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }
 
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.println();
  Serial.print("In connessione a: ");
  Serial.println(ssid);
 
  WiFi.begin(ssid, password);
 
  // attempt to connect to Wifi network:
  while(WiFi.status() != WL_CONNECTED) {
    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("Connesso al WiFi");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  WiFi.macAddress(mac);
  Serial.print("MAC: ");
  Serial.print(mac[0],HEX);
  Serial.print(":");
  Serial.print(mac[1],HEX);
  Serial.print(":");
  Serial.print(mac[2],HEX);
  Serial.print(":");
  Serial.print(mac[3],HEX);
  Serial.print(":");
  Serial.print(mac[4],HEX);
  Serial.print(":");
  Serial.println(mac[5],HEX);
  server.begin();
}

void loop() {
  // listen for incoming clients
  if ((WiFi.status() != WL_CONNECTED) && (millis() > check_wifi)) {
    Serial.println("Riconnessione al WiFi...");
    WiFi.disconnect();
    WiFi.begin(ssid, password);
    check_wifi = millis() + 30000;
  }
 
  WiFiClient client = server.available();
  if (client) {
    Serial.println("Nuovo accesso");
    memset(linebuf,0,sizeof(linebuf));
    charcount=0;
    // an http request ends with a blank line
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        Serial.write(c);
        //read char by char HTTP request
        linebuf[charcount]=c;
        if (charcount<sizeof(linebuf)-1) charcount++;
        // if you've gotten to the end of the line (received a newline
        // character) and the line is blank, the http request has ended,
        // so you can send a reply
        if (c == '\n' && currentLineIsBlank) {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println("Connection: close");  // the connection will be closed after completion of the response
          client.println();
          client.println("<!DOCTYPE HTML><html><head>");
          client.println("<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\"></head>");
          client.println("<h1>ESP32 - Accensione Remota PC V2.0</h1>");
          client.println("<p>Relay 1: <a href=\"on1\"><button>Triggera</button></a>&nbsp;");
          client.println("</html>");
          break;
        }
        if (c == '\n') {
          // you're starting a new line
          currentLineIsBlank = true;
          if (strstr(linebuf,"GET /on1") > 0){
            Serial.println("LED 1 ON");
            digitalWrite(led1, HIGH);
            delay(100);
            Serial.println("LED 1 OFF");
            digitalWrite(led1, LOW);
          }

          // you're starting a new line
          currentLineIsBlank = true;
          memset(linebuf,0,sizeof(linebuf));
          charcount=0;
        } else if (c != '\r') {
          // you've gotten a character on the current line
          currentLineIsBlank = false;
        }
      }
    }
    // give the web browser time to receive the data
    delay(1);

    // close the connection:
    //client.stop();
    //Serial.println("client disconnected");
  }
}

This code is loaded in ESP32 that is connected to a relay.
If access to the ESP32 Webpage, and if i press the button "trigger", the relay will switch on and off, and it turn on my pc.

I made a port forwarding on a random port in order to use this outside home.
This system works, but have 1 issue.

Randomly if i use my cellphone to navigate in wifi LAN, the relay turn on my pc.
This is annoying, because i don't want to turn on my pc.
I want turn on my pc only if i access to my webpage and if i press the "Trigger" button.

In attached you can see my router configuration.

Someone can help me resolving this issue?

Thank you all

Davide

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