Web server on esp32

Projects Programming
1

Hello

I made a very simple sketch to test a web server on ESP32:

#include <WiFi.h>
#include <WiFiClient.h>
#include <WebServer.h>
#include <ESPmDNS.h>

const char* ssid = "Net5231";
const char* password = "ckl8796";
WebServer server(80);

// Define routing
void restServerRouting() {
  server.on("/", HTTP_GET, []() {
    server.send(200, F("text/html"),
                F("Welcome to the REST Web Server"));
  });
}

// Manage not found URL
void handleNotFound() {
  String message = "File Not Found\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(404, "text/plain", message);
}

void setup() {
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.println("");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  if (MDNS.begin("esp32test")) {
    Serial.println("MDNS responder started");
  }
  Serial.print(WiFi.localIP());
  restServerRouting();
  server.onNotFound(handleNotFound);
  server.begin();
  Serial.println("HTTP server started");
}

void loop() {
server.handleClient();
}

Turns out it works fine on notebook/windows10 when I try to open with "esp32test.local"

image
image1366×725 10 KB

However, on Android, the same does not happen:

image
image720×1600 99.9 KB

But if I type the IP, it works:

image
image720×1600 38.9 KB

I'm quite new to this issue, the first time I've worked with this, but is there a chance that the problem is in the ESP32 code and MDNS.begin()?

Thanks

2

I understand that Android only recently (this year) provided supported mDNS.

What version of Android are you running? Older versions may still not work.

3

Android version 12.
Is there another solution to the problem other than using mDNS in the Arduino sketch? The intention was to create POST functions, simulating an API.

4

You could tell your DHCP server (usually your WiFi router) to always assign a specific IP address to that MAC address. Then it would be safe to use the IP address.

5

Would it be assigning a fixed IP?
Like this: ESP8266 NodeMCU Static/Fixed IP Address (Arduino IDE) | Random Nerd Tutorials

6

Yes... that shows both ways to do it... either from the client (ESP8266) or from the router side.

7

A fixed IP on the LAN side of the router (NAT).

8

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