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Arduino IDE for ESP8266 项目（4）HTTP客户端+服务端

Arduio for esp8266

官网API：http://arduino-esp8266.readthedocs.io/en/latest/esp8266wifi/readme.html

很有价值的参考文献：http://blog.csdn.net/sadshen/article/details/46883245
参考的例程：https://github.com/SmartArduino/ESPDuino/tree/master/Book

网友参考：http://www.arduino.cn/thread-18958-1-1.html

手机一键配置软件

下载ESPTOUCH软件：https://github.com/EspressifApp/IOT-Espressif-Apk
ESPTOUCH的源码：https://github.com/EspressifApp/EsptouchForAndroid

要想端到端通信两步

1 AP或STA，将自己接入某网络或者自己当网路。

2 建立一个server 或者 client ，在第一里形成的网络里去通信。

1 SF1 STA模式-连接路由器-设置AP-建立sever-手机通过软件 ip+端口访问

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/*  WiFiTelnetToSerial - 使用通用异步收发传输器（Universal Asynchronous 
 
Receiver/Transmitter，UART）与ESPDUINO进行TCP透传的例子 */
 
#include <ESP8266WiFi.h>
 
//定义可连接的客户端数目最大值
 
#define MAX_SRV_CLIENTS 1
 
const char* ssid = "Doit";
 
const char* password = "doit3305";
 
WiFiServer server(23);
 
WiFiClient serverClients[MAX_SRV_CLIENTS];
 
void setup() {
 
  Serial.begin(115200);
 
  WiFi.begin(ssid, password);
 
  Serial.print("\nConnecting to "); Serial.println(ssid);
 
  uint8_t i = 0;
 
  while (WiFi.status() != WL_CONNECTED && i++ < 20) delay(500);
 
  if(i == 21){ //超时（20x500=10000,10秒钟），提示连接失败
 
    Serial.print("Could not connect to"); Serial.println(ssid);
 
    while(1) delay(500);
 
  }
 
  //启动UART传输和服务器
 
  server.begin();
 
  server.setNoDelay(true);
 
  Serial.print("Ready! Use 'telnet ");
 
  Serial.print(WiFi.localIP());//获得服务器本地IP
 
  Serial.println(" 23' to connect");
 
}
 
void loop() {
 
  uint8_t i;
 
  //检测服务器端是否有活动的客户端连接
 
  if (server.hasClient()){
 
    for(i = 0; i < MAX_SRV_CLIENTS; i++){
 
      //查找空闲或者断开连接的客户端，并置为可用
 
      if (!serverClients[i] || !serverClients[i].connected()){
 
        if(serverClients[i]) serverClients[i].stop();
 
        serverClients[i] = server.available();
 
        Serial.print("New client: "); Serial.println(i);
 
        continue;
 
      }
 
    }
 
    //若没有可用客户端，则停止连接
 
    WiFiClient serverClient = server.available();
 
    serverClient.stop();
 
  }
 
  //检查客户端的数据
 
  for(i = 0; i < MAX_SRV_CLIENTS; i++){
 
    if (serverClients[i] && serverClients[i].connected()){
 
      if(serverClients[i].available()){
 
        //从Telnet客户端获取数据，并推送到URAT端口
 
        while(serverClients[i].available()) Serial.write(serverClients[i].read());
 
      }
 
    }
 
  }
 
  //检查UART端口数据
 
  if(Serial.available()){
 
    size_t len = Serial.available();
 
    uint8_t sbuf[len];
 
    Serial.readBytes(sbuf, len);
 
    //将UART端口数据推送到所有已连接的telnet客户端，实现双向通信
 
    for(i = 0; i < MAX_SRV_CLIENTS; i++){
 
      if (serverClients[i] && serverClients[i].connected()){
 
        serverClients[i].write(sbuf, len);
 
        delay(1);
 
      }
 
    }
 
  }
 
}

1.2 SF1 STA模式-连接路由器-设置AP-建立sever-手机通过网页+软件IP+端口访问

#include <ESP8266WiFi.h>
 
const char* ssid = "dongdong";
const char* password = "dongdong";
 
WiFiServer server(80);
 
 
void setup()
{
  Serial.begin(115200);
  Serial.println();
<br>IPAddress staticIP(192,168,1,22);<br>IPAddress gateway(192,168,1,9);<br>IPAddress subnet(255,255,255,0);<br>
  Serial.printf("Connecting to %s ", ssid);
  WiFi.begin(ssid, password);<br><br>WiFi.config(staticIP, gateway, subnet);<br><br>
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }
  Serial.println(" connected");
 
  server.begin();
  Serial.printf("Web server started, open %s in a web browser\n", WiFi.localIP().toString().c_str());
}
 
 
// prepare a web page to be send to a client (web browser)
String prepareHtmlPage()
{
  String htmlPage =
     String("HTTP/1.1 200 OK\r\n") +
            "Content-Type: text/html\r\n" +
            "Connection: close\r\n" +  // the connection will be closed after completion of the response
            "Refresh: 5\r\n" +  // refresh the page automatically every 5 sec
            "\r\n" +
            "<!DOCTYPE HTML>" +
            "<html>" +
            "Analog input:  " + String(analogRead(A0)) +
            "</html>" +
            "\r\n";
  return htmlPage;
}
 
 
void loop()
{
  WiFiClient client = server.available();
  // wait for a client (web browser) to connect
  if (client)
  {
    Serial.println("\n[Client connected]");
    while (client.connected())
    {
      // read line by line what the client (web browser) is requesting
      if (client.available())
      {
        String line = client.readStringUntil('\r');
        Serial.print(line);
        // wait for end of client's request, that is marked with an empty line
        if (line.length() == 1 && line[0] == '\n')
        {
          client.println(prepareHtmlPage());
 
           
          break;
        }
      }
    }
    delay(1); // give the web browser time to receive the data
 
    // close the connection:
    client.stop();
    Serial.println("[Client disonnected]");
  }
}

2 SF2

2.1 SAT模式-连接WIFI-建立client+远程访问IP+端口

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#include <ESP8266WiFi.h>
 
const char* ssid      = "Doit";    //change to your own ssid
 
const char* password  = "doit3305";//change to your own password
 
const char* serverIP  = "115.29.109.104";
 
int serverPort = 6535;
 
WiFiClient client;
 
bool bConnected = false;
 
char buff[512];
 
int nm = 0;
 
void setup() {
 
  Serial.begin(115200);
 
  delay(10);
 
  Serial.println();
 
  Serial.println();
 
  Serial.print("Connecting to ");
 
  Serial.println(ssid);
 
  WiFi.begin(ssid, password);
 
  while (WiFi.status() != WL_CONNECTED) {
 
    delay(500);
 
    Serial.print(".");
 
  }
 
  Serial.println("");
 
  Serial.println("WiFi connected");
 
  Serial.println("IP address: ");
 
  Serial.println(WiFi.localIP());
 
}
 
void loop() {
 
  delay(1);
 
  if (bConnected == false)
 
  {
 
    if (!client.connect(serverIP, serverPort))
 
    {
 
      Serial.println("connection failed");
 
      delay(5000);
 
      return;
 
    }
 
    bConnected = true;
 
    Serial.println("connection ok");
 
  }
 
  else if (client.available())
 
  {
 
    Serial.println("Data is coming");
 
    while (client.available())
 
    {
 
      buff[nm++] = client.read();
 
      if (nm >= 511) break;
 
    }
 
    buff[nm] = 0x00;
 
    nm=0;
 
    Serial.print(buff);
 
    client.print(buff);
 
    client.flush();
 
  }
 
}

2.2 SAT模式-连接WIFI-建立client+远程访问网页

#include <ESP8266WiFi.h>
 
const char* ssid = "********";
const char* password = "********";
 
const char* host = "www.example.com";
 
 
void setup()
{
  Serial.begin(115200);
  Serial.println();
 
  Serial.printf("Connecting to %s ", ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }
  Serial.println(" connected");
}
 
 
void loop()
{
  WiFiClient client;
 
  Serial.printf("\n[Connecting to %s ... ", host);
  if (client.connect(host, 80))
  {
    Serial.println("connected]");
 
    Serial.println("[Sending a request]");
    client.print(String("GET /") + " HTTP/1.1\r\n" +
                 "Host: " + host + "\r\n" +
                 "Connection: close\r\n" +
                 "\r\n"
                );
 
    Serial.println("[Response:]");
    while (client.connected())
    {
      if (client.available())
      {
        String line = client.readStringUntil('\n');
        Serial.println(line);
      }
    }
    client.stop();
    Serial.println("\n[Disconnected]");
  }
  else
  {
    Serial.println("connection failed!]");
    client.stop();
  }
  delay(5000);
}

3 AF1 AP-Sever

#include <ESP8266WiFi.h>
 
const char *ssid = "Charlie Testing AP";
const char *password = "12345678";
WiFiServer server(80);
void setup()
{
  Serial.begin(115200);
  Serial.println();
 
  Serial.print("Setting soft-AP ... ");
   
IPAddress softLocal(192,168,128,1);   
IPAddress softGateway(192,168,128,1);
IPAddress softSubnet(255,255,255,0);
 
WiFi.softAPConfig(softLocal, softGateway, softSubnet);  
 
    WiFi.softAP(ssid, password);
   
   IPAddress myIP = WiFi.softAPIP();
  Serial.print("AP IP address: ");
  Serial.println(myIP);
 server.begin();
 Serial.printf("Web server started, open %s in a web browser\n", WiFi.localIP().toString().c_str());
 
}
 
void loop()
{
 WiFiClient client = server.available();
 if (client)
  {
    Serial.println("\n[Client connected]");
    while (client.connected())
    {
      // read line by line what the client (web browser) is requesting
      if (client.available())
      {
        String line = client.readStringUntil('\r');
        Serial.print(line);
        // wait for end of client's request, that is marked with an empty line
        if (line.length() == 1 && line[0] == '\n')
        {
          client.println(prepareHtmlPage());
 
           
          break;
        }
      }
    }
    delay(1); // give the web browser time to receive the data
 
    // close the connection:
    client.stop();
    Serial.println("[Client disonnected]");
  }
 
 
}
 
// prepare a web page to be send to a client (web browser)
String prepareHtmlPage()
{
  String htmlPage =
     String("HTTP/1.1 200 OK\r\n") +
            "Content-Type: text/html\r\n" +
            "Connection: close\r\n" +  // the connection will be closed after completion of the response
            "Refresh: 5\r\n" +  // refresh the page automatically every 5 sec
            "\r\n" +
            "<!DOCTYPE HTML>" +
            "<html>" +
            "Analog input:  " + String(analogRead(A0)) +
            "</html>" +
            "\r\n";
  return htmlPage;<br>}