HTTP协议数据通讯02-客户端向服务器请求数据信息-服务端
/*
* 从服务端获取数据信息
* - 实时获取服务器端开发板上按钮引脚状态
* - 当有客户端向ESP8266服务器的/update发送请求时,将服务器的按键引脚状态通过响应信息回复给客户端
* 服务端代码
*/
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <ESP8266WebServer.h>
#define buttonPin D3//按钮引脚D3
ESP8266WiFiMulti wifiMulti;
ESP8266WebServer webServer(80);//建立网络服务器对象,用于响应HTTP请求。监听端口80
IPAddress local_IP(192,168,0,111);
IPAddress gateway(192,168,0,1);
IPAddress subnet(255,255,255,0);
IPAddress dns(192,168,0,1);
bool pinState;
void setup() {
Serial.begin(9600);
Serial.println("");
// 设置开发板网络环境
if(!WiFi.config(local_IP,gateway,subnet)){
Serial.println("Failed to ESP8266 IP");
}
wifiMulti.addAP("1124","11241124");
Serial.println("Start Connect");
while(wifiMulti.run() != WL_CONNECTED){
delay(250);
Serial.print(".");
}
Serial.println("");
Serial.println("Connected to ");
Serial.println(WiFi.SSID());
Serial.println("IP Address: ");
Serial.println(WiFi.localIP());
webServer.on("/update",handleUpdate);//处理客户端HTTP请求LED状态
webServer.begin();
Serial.println("HTTP ESP8266 Started");
}
void loop() {
pinState = digitalRead(buttonPin);// 获取引脚状态
webServer.handleClient(); // 处理http服务器访问
}
void handleUpdate(){
String pinStateStr;
pinState == HIGH ? pinStateStr = "1" : pinStateStr = "0";
webServer.send(200,"text/html","buttonState: "+pinStateStr);
}
客户端代码