ESP8266 Community Forum

- Sun Feb 14, 2021 9:20 pm #90516 I am starting with esp01s , and I am trying to run the example

Code: Select all/*
  ESP8266 mDNS-SD responder and query sample

  This is an example of announcing and finding services.

  Instructions:
  - Update WiFi SSID and password as necessary.
  - Flash the sketch to two ESP8266 boards
  - The last one powered on should now find the other.
*/

#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>

#ifndef STASSID
#define STASSID "My_Home_NetWork"
#define STAPSK  "mohamed&aya"
#endif

const char* ssid     = STASSID;
const char* password = STAPSK;
char hostString[16] = {0};

void setup() {
  Serial.begin(115200);
  delay(100);
  Serial.println("\r\nsetup()");

  sprintf(hostString, "ESP_%06X", ESP.getChipId());
  Serial.print("Hostname: ");
  Serial.println(hostString);
  WiFi.hostname(hostString);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(250);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  if (!MDNS.begin(hostString)) {
    Serial.println("Error setting up MDNS responder!");
  }
  Serial.println("mDNS responder started");
  MDNS.addService("esp", "tcp", 8080); // Announce esp tcp service on port 8080

  Serial.println("Sending mDNS query");
  int n = MDNS.queryService("esp", "tcp"); // Send out query for esp tcp services
  Serial.println("mDNS query done");
  if (n == 0) {
    Serial.println("no services found");
  } else {
    Serial.print(n);
    Serial.println(" service(s) found");
    for (int i = 0; i < n; ++i) {
      // Print details for each service found
      Serial.print(i + 1);
      Serial.print(": ");
      Serial.print(MDNS.hostname(i));
      Serial.print(" (");
      Serial.print(MDNS.IP(i));
      Serial.print(":");
      Serial.print(MDNS.port(i));
      Serial.println(")");
    }
  }
  Serial.println();

  Serial.println("loop() next");
}

void loop() {
  // put your main code here, to run repeatedly:
  MDNS.update();
}

the output was

Code: Select all04:17:46.186 -> setup()
04:17:46.186 -> Hostname: ESP_A0AAD7
04:17:46.512 -> ...............
04:17:50.874 -> Connected to My_Home_NetWork
04:17:50.874 -> IP address: 192.168.1.107
04:17:50.874 -> mDNS responder started
04:17:50.874 -> Sending mDNS query
04:17:51.852 -> mDNS query done
04:17:51.852 -> 1 service(s) found
04:17:51.852 -> 1: ESP_4E3621.local (192.168.1.105:8080)
04:17:51.852 ->
04:17:51.852 -> loop() next


put when i ping it "ping ESP_4E3621.local" or "ping ESP_A0AAD7.local"

it didnt work

how to test them ?

- Wed Feb 17, 2021 11:13 am #90559 Basically this should work. You should be able to ping your device with the xxxx.local address and get an answer.

We need a little bit more information about your setup.
- do you really have MDNS working on the system you are pinging from?
- is the system you are pinging from in the same network? (same IP address range)

Don't worry, we will get to the bottom of this.

Kind regards,
Urs.

- Thu Feb 18, 2021 7:38 am #90573

Basically this should work. You should be able to ping your device with the xxxx.local address and get an answer.

We need a little bit more information about your setup.
- do you really have MDNS working on the system you are pinging from?
- is the system you are pinging from in the same network? (same IP address range)

Don't worry, we will get to the bottom of this.

Kind regards,
Urs.

yes same network , and i can ping it with the IP

- Mon Feb 22, 2021 10:58 pm #90608 Make sure your laptop or phone has the thingie installed to do mDNS stuff.

If you have a windows laptop, you need to install bonjour.
Here is a link to the package:
https://support.apple.com/kb/DL999?locale=en_US

If you have Mac laptop, bonjour should already be installed.

If you running Ubuntu Linux, you need to install avahi-daemon (and optionally?? avahi-utils).
you can run:
sudo apt-get install avahi-daemon