ESP8266 tcp server sample

from https://zhuanlan.zhihu.com/p/27668432





/*在NodeMCU搭建了TCP server端，PC为client端与server进行简单通信*/

#include <ESP8266WiFi.h>
#include <WiFiClient.h>

// Hardcode WiFi parameters as this isn't going to be moving around.
const char* ssid = "deds"; //填入自己的WiFi名
const char* password = ""; //WiFi密码
//const char* ssid = "holan"; //填入自己的WiFi名
//const char* password = "12345678"; //WiFi密码



// Start a TCP Server on port 5045
WiFiServer server(88); //端口5045，自定义（避免公用端口）
WiFiClient client;

char data[1500];
int ind = 0;

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid,password);
  Serial.println("");
  //Wait for connection
  while(WiFi.status() != WL_CONNECTED) { //检查WiFi连接状态
    delay(500);
    Serial.print(".");
  }
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP()); //串口监视器显示IP地址

  // Start the TCP server
  server.begin();
}

void loop() {
    // put your main code here, to run repeatedly:
    if(!client.connected())
  {
    //try to connect to a new client
    client = server.available();
  }
  else
  {
    if(client.available() > 0)
    {
      //Serial.println("Connected to client");

      while(client.available())
      {
        data[ind] = client.read(); //读取client端发送的字符
        ind++;
      }
      client.flush();

      for(int j=0;j < ind; j++)
      {
        Serial.print(data[j]);
      }

      Serial.print("\n");
      ind = 0;
      client.print("OK! Got your request."); //在client端回复
    }

  }
}











/*soft ap version*/

#include <ESP8266WiFi.h>
#include <WiFiClient.h>

// Start a TCP Server on port 5045
WiFiServer server(88); //端口5045，自定义（避免公用端口）
WiFiClient client;

char data[1500];
int ind = 0;

IPAddress local_IP(192, 168, 4, 1);
IPAddress gateway(192, 168, 4, 9);
IPAddress subnet(255, 255, 255, 0);

void setup()
{
  Serial.begin(115200);
  Serial.println();

  Serial.print("Setting soft-AP configuration ... ");
  Serial.println(WiFi.softAPConfig(local_IP, gateway, subnet) ? "Ready" : "Failed!");

  Serial.print("Setting soft-AP ... ");
  Serial.println(WiFi.softAP("ntou") ? "Ready" : "Failed!");

  Serial.print("Soft-AP IP address = ");
  Serial.println(WiFi.softAPIP());

  // Start the TCP server
  server.begin();
}

void loop() {
  // put your main code here, to run repeatedly:
  if (!client.connected())
  {
    //try to connect to a new client
    client = server.available();
  }
  else
  {
    if (client.available() > 0)
    {
      //Serial.println("Connected to client");

      while (client.available())
      {
        data[ind] = client.read(); //读取client端发送的字符
        ind++;
      }
      client.flush();

      for (int j = 0; j < ind; j++)
      {
        Serial.print(data[j]);
      }

      Serial.print("\n");
      ind = 0;
      client.print("OK! Got your request."); //在client端回复
    }

  }
}