ESP8266-01一些内容

系统有些指令必须特性状态下才可以执行，即先执行一些其它AT指令

1.设置station模式的IP信息

AT+CIPSTA="192.168.19.1","192.168.1.1","255.255.0.0"

设置后，使用AT+CWDHCP=2,1

恢复:DHCP方式

2.启动后服务器

AT+CIPMUX=1

AT+CIPSERVER=1,333  --后面是端口

3.启动UDP广播地址监听

AT+CIPMUX=1

AT+CIPSTART=0,"UDP","255.255.255.255",1111,2000,2

说明:1111任意端口（表示远程),2000为本地端口,

2(mode参数)表示以最后一次收到数据包IP为目标地址，也就是说如果有多个IP给本设备发送UDP包，那么AT+CIPSEND=0,x回复时数据发给最后一个发消息过来的

当采用mode=2时使用:AT+CIPSTATUS可以查看最后一发请求过来的的链接情况

4.启动UDP链接

AT+CIPSTART=0,"UDP","192.168.88.88",8080,2000,2

参数2与上面一样，比方192.168.88.11:8111,最后一个给设备发UPD包，那么设备回复时的目标设备就是192.168.88.11:8111了

5.退出透传模式

1.发送+++后面不要有回车换行

2.等一会

3.发送回车与换行

4.发送AT&回车换行看命令是否恢复

6.Arduino下进行测试

/*
ESP-01    

VCC       -------- 3.3V
GND      -------- GND
CH-PD   -------- 3.3V (加不加10K电阻都可以）

TXD       ------   10  // 软串口的RX
RXD       -------  11  // 软串口的TX

UNO的代码：
*/
#include <SoftwareSerial.h>

SoftwareSerial mySerial(, ); // RX, TX

void setup()
{
  // Open serial communications and wait for port to open:
  Serial.begin();
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }

  Serial.println("Goodnight moon!");

  // set the data rate for the SoftwareSerial port
  mySerial.begin();
  mySerial.println("Hello, world?");
}

void loop() // run over and over
{
  if (mySerial.available())
    Serial.write(mySerial.read());
  if (Serial.available())
    mySerial.write(Serial.read());
}

7.启动后开启UDP透传模式，以及看门狗
服务端需要按$F...$E的格式封送数据

#include <avr/wdt.h>
#include <SoftwareSerial.h>

SoftwareSerial mySerial(, ); // RX, TX
unsigned long lastSendTime=;
unsigned long lastReceiveTime=;
String RecCache="";

void setup()
{
  pinMode(,OUTPUT);
  digitalWrite(,LOW);

  // Open serial communications and wait for port to open:
  Serial.begin();
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }

  Serial.println("Ready!");

  // set the data rate for the SoftwareSerial port
  mySerial.begin();

  mySerial.print("+++");
  delay();
  mySerial.println("AT");

  mySerial.println("AT+RST");
  delayAndRead();

  //
  while(!isGotIP()){
    digitalWrite(,HIGH);
    delay();
    digitalWrite(,LOW);
    cls();
  }
  mySerial.println("AT+CIPSTART=\"UDP\",\"122.226.151.4\",12462,2000,0");
  delayAndRead();
  mySerial.println("AT+CIPMODE=1");
  delayAndRead();
  mySerial.println("AT+CIPSEND");
  delayAndRead();

   wdt_enable(WDTO_8S);
}

void loop() // run over and over
{
  //handle user input cmd
  while (Serial.available()){
    mySerial.write(Serial.read());
  }

  while(mySerial.available()){
    char c= mySerial.read();
    RecCache=RecCache +(String)c;
  }

  int bIndex= RecCache.indexOf("$F");
  if(bIndex>=){
    int eIndex=RecCache.indexOf("$E",bIndex);
    if(eIndex>=){
       //Extra Data
       String data=RecCache.substring(bIndex+,eIndex);
       RecCache=RecCache.substring(eIndex);
       lastReceiveTime=millis();

       handleData(data);
    }
  }else{
    RecCache="";
  }

  if(RecCache.length()>=)RecCache="";

  //check watchdog
  if((millis()-lastReceiveTime)<){
    wdt_reset();
  }

  //heart beat
  if((millis()-lastSendTime)>=){
       mySerial.println(millis());
      lastSendTime=millis();
    }
}

void handleData(String data){

  Serial.println(data);
}

void cls(){
   while(mySerial.available()){
     mySerial.read();
  }
}

void delayAndRead(int waitTime){
   delay(waitTime);
   while(mySerial.available()){
     Serial.write(mySerial.read());
   }
}

boolean isGotIP(){
  mySerial.println("AT+CIPSTATUS");
  delay();

 if( mySerial.find("STATUS:2")){
   return true;
 }
 return false;

}

UDP服务端代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace SmartPivot.WinClient
{
    public partial class Form1 : Form
    {
        private UdpClient udpServer = null;
        private bool isRunning = false;
        private bool Enable = false;
        private SynchronizationContext SyncCtx = null;

        public Form1()
        {
            InitializeComponent();
            SyncCtx = SynchronizationContext.Current;
            btnSend.Enabled = false;
        }

        private void btnSwitch_Click(object sender, EventArgs e)
        {
            try
            {
                if (isRunning)
                {
                    btnSend.Enabled = false;
                    _Stop();
                }
                else
                {

                    ThreadPool.QueueUserWorkItem(o =>
                    {
                        _Start();
                    }, null);
                    btnSend.Enabled = true;
                }
            }
            catch (Exception ex)
            {

            }
        }
        private void _Stop()
        {
            Enable = false;

            if (udpServer != null)
            {
                try
                {
                    udpServer.Close();

                }
                catch { }
            }
            isRunning = false;
            this.Text = "已停止";
        }
        private void _Start()
        {
            if (isRunning) return;
            Enable = true;
            //设置标题
            SyncCtx.Post(o =>
            {
                this.Text = "运行中";
            }, null);

            var ipAddress = IPAddress.Parse(txtIP.Text);
            int port = int.Parse(txtPort.Text);

            // udpServer.Client.Bind(new IPEndPoint(ipAddress, port));
            // udpServer.Connect(new IPEndPoint(ipAddress, port));
            udpServer = new UdpClient(new IPEndPoint(ipAddress, port));
            udpServer.AllowNatTraversal(false);
            var remote = new IPEndPoint(, );
            isRunning = true;

            while (Enable)
            {
                try
                {
                    byte[] receiveData = udpServer.Receive(ref remote);
                    var str = Encoding.ASCII.GetString(receiveData);
                    Console.WriteLine(string.Format("Remote,{0}:{1},[{2}]",
                                                     remote.Address.ToString(),
                                                     remote.Port, DateTime.Now));
                    Console.WriteLine(str);
                    var responseTmp = String.Format("{0},{1},{2}" , remote.ToString(), DateTime.Now.ToString("yyMMddHHmmss"), Guid.NewGuid().ToString());
                    var responseDate = Encoding.ASCII.GetBytes("$F" + responseTmp.Length + ":" + responseTmp +"$E" + Environment.NewLine);
                    udpServer.Send(responseDate, responseDate.Length, remote);

                    SyncCtx.Post(o => {
                        txtRIP.Text = remote.Address.ToString();
                        txtRPort.Text = remote.Port.ToString();
                    }, null);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }

            }

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            var ip = Dns.GetHostEntry(Dns.GetHostName()).AddressList.FirstOrDefault(ent => ent.AddressFamily == AddressFamily.InterNetwork);
            txtIP.Text = ip == null ? "" : ip.ToString();
            txtPort.Text = "";
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            try
            {
                if (udpServer == null) return;
                var sendData=Encoding.ASCII.GetBytes(txtSend.Text);
                var ipAddress = IPAddress.Parse(txtRIP.Text);
                int port = int.Parse(txtRPort.Text);
                udpServer.Send(sendData, sendData.Length, new IPEndPoint(ipAddress, port));
            }
            catch (Exception ex)
            {
                Console.WriteLine("Send Err:" + ex.Message);
            }
        }
    }
}

 8.设置AP名称
AT+CWSAP="DF21_LSC","12345678",5,3

其中5表示通道，3表示WPA2_PSK

密码需要8位以上

9.设置波特率

默认是115200

mySerial.println("AT+CIOBAUD=9600");