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Basic Infos
- This issue complies with the issue POLICY doc.
- I have read the documentation at readthedocs and the issue is not addressed there.
- I have searched the issue tracker for a similar issue.
- I have tested that the issue is present in current master branch (aka latest git).
- I have filled out all fields below.
Platform
- Hardware: ESP-12
- Core Version: 85f1ea7
- Development Env: Arduino IDE
- Operating System: MacOS
Settings in IDE
- Module: NodeMcu 1.0
- Flash Size: [4MB/1MB]
- lwip Variant: [v2 Lower Higher Bandwidth]
- Upload Using: SERIAL
Problem Description
MDNS isn't working continuously after this commit f9009b8.
Problem Scenario -
After calling mdns.begin() once, it says ok. Now if a new device which is running a service discovery application, Joins the wifi network, it cannot find the .local service and cannot connect to the esp node using .local hostname.
I am attaching a screenshot from my service discovery browser, which publishes a remove event for this esp node.
This was working fine previous to this commit, i have verified that.
MCVE Sketch
/*
ESP8266 mDNS responder sample
This is an example of an HTTP server that is accessible
via http://esp8266.local URL thanks to mDNS responder.
Instructions:
- Update WiFi SSID and password as necessary.
- Flash the sketch to the ESP8266 board
- Install host software:
- For Linux, install Avahi (http://avahi.org/).
- For Windows, install Bonjour (http://www.apple.com/support/bonjour/).
- For Mac OSX and iOS support is built in through Bonjour already.
- Point your browser to http://esp8266.local, you should see a response.
*/
#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>
#include <WiFiClient.h>
#ifndef STASSID
#define STASSID "MYSSID"
#define STAPSK "MYPASS"
#endif
unsigned long last_done = millis();
const char* ssid = STASSID;
const char* password = STAPSK;
// TCP server at port 80 will respond to HTTP requests
WiFiServer server(80);
void setup(void) {
Serial.begin(115200);
delayInit(2);
// Connect to WiFi network
WiFi.mode(WIFI_STA);
connectToWifi();
// Set up mDNS responder:
// - first argument is the domain name, in this example
// the fully-qualified domain name is "esp8266.local"
// - second argument is the IP address to advertise
// we send our IP address on the WiFi network
if (!MDNS.begin("esp8266_special_xx")) {
Serial.println("Error setting up MDNS responder!");
while (1) {
delay(1000);
}
}
Serial.println("mDNS responder started");
// Start TCP (HTTP) server
server.begin();
Serial.println("TCP server started");
// Add service to MDNS-SD
MDNS.addService("http", "tcp", 80);
}
void loop(void) {
MDNS.update();
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
return;
}
Serial.println("");
Serial.println("New client");
// Wait for data from client to become available
while (client.connected() && !client.available()) {
delay(1);
}
// Read the first line of HTTP request
String req = client.readStringUntil('\r');
// First line of HTTP request looks like "GET /path HTTP/1.1"
// Retrieve the "/path" part by finding the spaces
int addr_start = req.indexOf(' ');
int addr_end = req.indexOf(' ', addr_start + 1);
if (addr_start == -1 || addr_end == -1) {
Serial.print("Invalid request: ");
Serial.println(req);
return;
}
req = req.substring(addr_start + 1, addr_end);
Serial.print("Request: ");
Serial.println(req);
client.flush();
String s;
if (req == "/") {
IPAddress ip = WiFi.localIP();
String ipStr = String(ip[0]) + '.' + String(ip[1]) + '.' + String(ip[2]) + '.' + String(ip[3]);
s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>Hello from ESP8266 at ";
s += ipStr;
s += "</html>\r\n\r\n";
Serial.println("Sending 200");
} else {
s = "HTTP/1.1 404 Not Found\r\n\r\n";
Serial.println("Sending 404");
}
client.print(s);
Serial.println("Done with client");
}
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