(四）esp8266 MDNS域名服务

（实例一）ESP8266 TFT(ST7735)彩屏-web刷图

https://www.arduino.cn/thread-42247-1-1.html

(四）esp8266 MDNS域名服务-LMLPHP

（实例二）自己当AP时建立MDNS域名

(四）esp8266 MDNS域名服务-LMLPHP

https://github.com/esp8266/Arduino/blob/master/libraries/ESP8266mDNS/examples/mDNS_Web_Server/mDNS_Web_Server.ino

/*

  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 "your-ssid"

#define STAPSK  "your-password"

#endif

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);

  // Connect to WiFi network

  WiFi.mode(WIFI_STA);

  WiFi.begin(ssid, password);

  Serial.println("");

  // Wait for connection

  while (WiFi.status() != WL_CONNECTED) {

    delay(500);

    Serial.print(".");

  }

  Serial.println("");

  Serial.print("Connected to ");

  Serial.println(ssid);

  Serial.print("IP address: ");

  Serial.println(WiFi.localIP());

  // 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")) {

    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");

}

　　（实例三）自己STA连WIFI

(四）esp8266 MDNS域名服务-LMLPHP

在代码中，我们将包含一个额外的库

# include <ESP8266mDNS.h>

在该库中，我们现在可以访问一个名为 MDNS 响应器的类，我们将使用它来声明一个对象。

MDNSResponder mdns;

　使用此对象，我们可以使用 begin方法创建我们将使用的 Web地址，并将其命名为“esp-01”。此方法需要的第二个参数是我们可以使用Wi-Fi对象的本地IP方法使用的Esp8266的IP地址。

mdns.begin（“esp-01”，Wifi.localIP（））;

添加一个条件语句，当它评估为true时，它会向用户打印一条消息，说 “M DNS 响应者已启动！”。

最后，使用MDNS 内置对象调用Add service 方法

MDNS.addService（ “HTTP”， “TCP”， “80”）;

　　这需要三个参数。牛逼HESE参数描述的类型，我们要在广播服务网络。在这种情况下，我们将在80上使用HTTP over TCP。

#include <ESP8266WiFi.h>

#include <ESP8266WebServer.h>

#include <ESP8266mDNS.h>

ESP8266WebServer server;

char* ssid = "YOUR_SSID";

char* password = "YOUR_PASSWORD";

MDNSResponder mdns;

void setup()

{

 WiFi.begin(ssid,password);

 Serial.begin(115200);

 while(WiFi.status()!=WL_CONNECTED)

 {

 Serial.print(".");

 delay(500);

 }

 Serial.println("");

 Serial.print("IP Address: ");

 Serial.println(WiFi.localIP());

if (mdns.begin("esp8266-01", WiFi.localIP()))

Serial.println("MDNS responder started");

server.on("/",[](){server.send(200,"text/plain","Hello World!");});

server.begin();

MDNS.addService("http", "tcp", 80);}

void loop()

{

server.handleClient();

}