#include <ESP8266WiFi.h>
#include <algorithm> 
#include <ESP8266WiFiMulti.h>

#ifndef STASSID
#define STASSID "esp8266"  //WIFI名
#define STAPSK  "12345678" //WIFI密码
#endif

#define BAUD_SERIAL 115200  // 串口波特率115200

#define RXBUFFERSIZE 1024  //设置串口接收的字节大小

//最多的连接个数
#define MAX_SRV_CLIENTS 4

const char* ssid = STASSID;  //wifi名字
const char* password = STAPSK;//wifi密码

const int port = 30;    //服务器端口30

WiFiServer server(port);   //创建服务器对象
WiFiClient serverClients[MAX_SRV_CLIENTS]; //连接对象数组

ESP8266WiFiMulti WiFiMulti;
WiFiClient client;


// 初始化函数
void setup() {
  Serial.begin(BAUD_SERIAL); // 串口初始化
  Serial.setRxBufferSize(RXBUFFERSIZE); //串口接收的初始化

  pinMode(LED_BUILTIN, OUTPUT);      //配置LED灯
  digitalWrite(LED_BUILTIN, HIGH);   //LED置高

  //设置客户端模式
  WiFi.mode(WIFI_STA);
  //连接网络
  WiFiMulti.addAP(ssid, password);
  Serial.println(ssid);
  Serial.println(password);
    // 等待连接WIFI
  while (WiFiMulti.run() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());  //获取自身IP地址
  delay(500);

  if (!client.connect("101.35.200.152", 7400)) {
    Serial.println("connection failed");
    delay(5000);
    return;
  }
  // 登录
  client.write("{\"usr\":\"admin2\", \"pwd\":\"789456123\"}");
}

// loop函数
void loop() {

  // 如果串口接收到数据
  if(Serial.available())
  {
    delay(10);
    size_t counti = Serial.available();
    uint8_t sbuf[counti];
    Serial.readBytes(sbuf, counti);
    if(client.connected()){
      client.write(sbuf, counti);
    }
  }
  while(client.available())
  {
    uint8_t c = client.read();
    Serial.write(c);
  }
}